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网站建设制作及推广,seo查询官网,wordpress 子主题插件,一个人开淘宝店容易吗一、软件开发流程需求分析：设计、UI设计、架构设计开发：前端开发、后端开发测试：功能测试、性能测试、安全测试上线：预发布环境、灰度(部分用户试用功能期间)、全量(对所有用户都开放)多次迭代更新二、具体过程 1.E-R图设计 E…

一、软件开发流程

需求分析：设计、UI设计、架构设计
开发：前端开发、后端开发
测试：功能测试、性能测试、安全测试
上线：预发布环境、灰度(部分用户试用功能期间)、全量(对所有用户都开放)
多次迭代更新

二、具体过程

1.E-R图设计

E-R图：实体关系图，是一种通过提供实体、属性和联系的方法来描述现实世界的概念模型。

实体：现实世界中的对象，ER图中用矩形表示，矩形框内写明实体名。

属性：实体所具有的某一个特性，ER图中用椭圆形或圆角矩形表示，并用无向边与相应的实体连接。

关系：实体之间的联系，主要有3种类型：一对一联系，一对多联系，多对多联系；ER图中用菱形表示，菱形框内写明联系名，并用无向边与有关实体连接。

以下是该项目的E-R图：

2.数据库设计

# ************************************************************
# Sequel Pro SQL dump
# Version 4541
#
# http://www.sequelpro.com/
# https://github.com/sequelpro/sequelpro
#
# Host: 127.0.0.1 (MySQL 5.7.12)
# Database: forum
# Generation Time: 2020-06-03 14:00:53 +0000
# ************************************************************/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;# Dump of table category
# ------------------------------------------------------------DROP DATABASE IF EXISTS xd_forum ;
CREATE DATABASE xd_forum CHARACTER SET utf8;
use xd_forum ;
SET FOREIGN_KEY_CHECKS=0;DROP TABLE IF EXISTS `category`;CREATE TABLE `category` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`name` varchar(128) DEFAULT NULL COMMENT '分类名称',`weight` int(11) DEFAULT NULL COMMENT '权重，数字越大权重越高',`create_time` datetime DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;LOCK TABLES `category` WRITE;
/*!40000 ALTER TABLE `category` DISABLE KEYS */;INSERT INTO `category` (`id`, `name`, `weight`, `create_time`)
VALUES(1,'黑客和画家',432,'2021-01-01 09:00:00'),(2,'前端生活',23,'2021-01-01 09:00:00'),(3,'人工智能',342,'2021-01-01 09:00:00'),(4,'自动化测试',44,'2021-01-01 09:00:00'),(5,'大数据',4,'2021-01-01 09:00:00'),(6,'Java进阶',3213,'2021-01-01 09:00:00'),(7,'网络安全',3231,'2021-01-01 09:00:00'),(8,'后端架构',32431,'2021-01-01 09:00:00');/*!40000 ALTER TABLE `category` ENABLE KEYS */;
UNLOCK TABLES;# Dump of table reply
# ------------------------------------------------------------DROP TABLE IF EXISTS `reply`;CREATE TABLE `reply` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`topic_id` int(11) DEFAULT NULL,`floor` int(11) DEFAULT NULL COMMENT '楼层编号，回复是不能删除的',`content` varchar(524) DEFAULT NULL COMMENT '回复内容',`user_id` int(11) DEFAULT NULL,`username` varchar(64) DEFAULT NULL COMMENT '回复人名称',`user_img` varchar(128) DEFAULT NULL COMMENT '回复人头像',`create_time` datetime DEFAULT NULL,`update_time` datetime DEFAULT NULL,`delete` int(11) DEFAULT NULL COMMENT '0是正常，1是禁用',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;LOCK TABLES `reply` WRITE;
/*!40000 ALTER TABLE `reply` DISABLE KEYS */;INSERT INTO `reply` (`id`, `topic_id`, `floor`, `content`, `user_id`, `username`, `user_img`, `create_time`, `update_time`, `delete`)
VALUES(24,22,1,'你以后面试说你5年经验，加班加的',17,'Anna小姐姐','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/14.jpeg','2020-06-03 21:21:31','2020-06-03 21:21:31',0),(25,22,2,'身体重要啊，少撸管',17,'张飞','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg','2020-06-03 21:22:44','2020-06-03 21:22:44',0),(26,22,3,'加班努力付出',17,'刘备','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/15.jpeg','2020-06-03 21:22:44','2020-06-03 21:22:44',0),(27,22,4,'重新找过，年轻怕啥',17,'关羽','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:22:44','2020-06-03 21:22:44',0),(28,22,5,'给多少钱你就去了？',17,'吕布','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:22:44','2020-06-03 21:22:44',0),(29,22,6,'重新找过，年轻怕啥',17,'关羽','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:22:44','2020-06-03 21:22:44',0),(30,22,7,'来我这边把，大量招聘',17,'曹操','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:22:44','2020-06-03 21:22:44',0),(31,21,8,'真逗啊，你这样发问题',17,'曹操','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:22:44','2020-06-03 21:22:44',0),(32,22,8,'加班多久呢? 我这边也加班',18,'大当家','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg','2020-06-03 21:38:23','2020-06-03 21:38:23',0),(33,22,9,'66666',18,'大当家','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg','2020-06-03 21:39:13','2020-06-03 21:39:13',0),(34,36,1,'我这边买了很多小滴课堂，有没交流群',18,'大当家','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg','2020-06-03 21:40:23','2020-06-03 21:40:23',0);/*!40000 ALTER TABLE `reply` ENABLE KEYS */;
UNLOCK TABLES;# Dump of table topic
# ------------------------------------------------------------DROP TABLE IF EXISTS `topic`;CREATE TABLE `topic` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`c_id` int(11) DEFAULT NULL COMMENT '分类',`title` varchar(128) DEFAULT NULL COMMENT '标题',`content` varchar(1024) DEFAULT NULL COMMENT '内容',`pv` int(11) DEFAULT NULL COMMENT '浏览量',`user_id` int(11) DEFAULT NULL,`username` varchar(64) DEFAULT NULL,`user_img` varchar(128) DEFAULT NULL,`create_time` datetime DEFAULT NULL,`update_time` datetime DEFAULT NULL,`hot` int(2) DEFAULT '0' COMMENT '是否热门 1是热门',`delete` int(11) DEFAULT '0' COMMENT '0是未删除，1是已经删除',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;LOCK TABLES `topic` WRITE;
/*!40000 ALTER TABLE `topic` DISABLE KEYS */;INSERT INTO `topic` (`id`, `c_id`, `title`, `content`, `pv`, `user_id`, `username`, `user_img`, `create_time`, `update_time`, `hot`, `delete`)
VALUES(20,1,'我是传统IT公司，想转行互联网公司怎么办？','以前是传统IT公司，想转行互联网公司怎么办？谁可以告诉我',3,17,'Anna小姐姐','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/14.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(21,1,'DDOS流量攻击怎么防止','网络带宽被别人占据了，没法上网',44,1,'二当家小D','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(22,1,'你对加班的是怎么看的？','自己也会合理评估工作，提高个人工作效率',6,17,'刘备','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/14.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(23,1,'被压在五指山上了咋办','我被别人压在五指山上了，怎么救我，我免费教你打怪',32,17,'孙悟空','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/16.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(24,6,'拿到面试通知，互联网公司都有多轮面试，怎么准备','谁有简历模板',33,4,'小明','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(25,1,'社招流程是怎么样的','明天要参加社招，流程是咋样的',42,4,'中山大学-西欧','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(26,6,'技术现场面试','如果同城一般直接现场面试吗',32,4,'路飞','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(27,6,'网站被人挖矿了怎么办','电脑被人安装挖矿程序了，谁知道怎么解决啊',2,17,'张飞','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/16.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(28,1,'被压在五指山上了咋办','我被别人压在五指山上了，怎么救我，我免费教你打怪',32,17,'隔壁老王','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/17.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(29,1,'要求有3年经验，可是我只有1~2年怎么办？','只能靠加班吗',32,4,'雅力士','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(30,6,'内推的岗位多种，实习和非实习(正式工作)','谁可以帮我内推',33,4,'小明','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(31,6,'要有礼貌，保持头脑清晰','要有礼貌，保持头脑清晰有帮助吗',33,4,'小明','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(32,1,'为什么说会被技术官完虐，怎样避免','校招+社招考查点很多，记不住',3,17,'刘冰','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/15.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(33,1,'为什么从上个公司离职？','不能说不好的，比如公司混乱、勾心斗角、负面情',3,17,'还珠格格','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(34,6,'做下简单的自我介绍？','尽量介绍和专业相关的，毕业、工作经历等',33,4,'小明','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(35,1,'要求本科，但我是大专学历不符合怎么办？','大专学历不符合怎么办？',3,17,'关羽','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg','2020-06-03 21:09:52','2020-06-03 21:09:52',0,0),(36,1,'我这边想学javaweb课程','谁有教程，我看小滴课堂有很多，谁买了',2,18,'大当家','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg','2020-06-03 21:39:52','2020-06-03 21:39:52',0,0),(37,3,'正确实现用 spring 扫描自定义的 annotation','我要学习',1,17,'Anna小姐姐','https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/14.jpeg','2020-06-03 21:55:11','2020-06-03 21:55:11',0,0);/*!40000 ALTER TABLE `topic` ENABLE KEYS */;
UNLOCK TABLES;# Dump of table user
# ------------------------------------------------------------DROP TABLE IF EXISTS `user`;CREATE TABLE `user` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`phone` varchar(32) DEFAULT NULL,`pwd` varchar(128) DEFAULT NULL,`sex` int(2) DEFAULT NULL COMMENT '0是女，1是男，2未知',`img` varchar(128) DEFAULT NULL,`create_time` datetime DEFAULT NULL,`role` int(11) DEFAULT NULL COMMENT '1是普通用户，2是管理员',`username` varchar(128) DEFAULT NULL,PRIMARY KEY (`id`),UNIQUE KEY `phone` (`phone`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;LOCK TABLES `user` WRITE;
/*!40000 ALTER TABLE `user` DISABLE KEYS */;INSERT INTO `user` (`id`, `phone`, `pwd`, `sex`, `img`, `create_time`, `role`, `username`)
VALUES(15,'123','202CB962AC59075B964B07152D234B70',2,'https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/14.jpeg','2020-06-03 21:07:59',1,'二当家小D'),(16,'23432','202CB962AC59075B964B07152D234B70',1,'https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/11.jpeg','2020-06-03 21:08:24',1,'小滴课堂-老王'),(17,'111','202CB962AC59075B964B07152D234B70',2,'https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/14.jpeg','2020-06-03 21:08:48',1,'Anna小姐姐'),(18,'888','202CB962AC59075B964B07152D234B70',1,'https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg','2020-06-03 21:37:52',1,'大当家');/*!40000 ALTER TABLE `user` ENABLE KEYS */;
UNLOCK TABLES;/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

3.创建项目环境

创建maven项目

设置java根目录

配置tomcat

在pom.xml中添加依赖

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>net.xdclass</groupId><artifactId>xd_forum</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>xd_forum Maven Webapp</name><!-- FIXME change it to the project's website --><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.7</maven.compiler.source><maven.compiler.target>1.7</maven.compiler.target></properties><dependencies><!--单元测试--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!--mysql驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.41</version></dependency><!-- JSP --><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.2</version><scope>provided</scope></dependency><!--工具类： https://mvnrepository.com/artifact/commons-dbutils/commons-dbutils --><dependency><groupId>commons-dbutils</groupId><artifactId>commons-dbutils</artifactId><version>1.7</version></dependency><!--数据库连接池：https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-dbcp2</artifactId><version>2.7.0</version></dependency><!-- https://mvnrepository.com/artifact/commons-beanutils/commons-beanutils --><dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.9.4</version></dependency><!-- https://mvnrepository.com/artifact/taglibs/standard --><dependency><groupId>taglibs</groupId><artifactId>standard</artifactId><version>1.1.2</version></dependency><!-- https://mvnrepository.com/artifact/javax.servlet/jstl --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency></dependencies><build><!--专门用于打包配置文件到类路径--><resources><resource><directory>src/main/java</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>true</filtering></resource></resources><finalName>xd_forum</finalName><pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --><plugins><plugin><artifactId>maven-clean-plugin</artifactId><version>3.1.0</version></plugin><!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --><plugin><artifactId>maven-resources-plugin</artifactId><version>3.0.2</version></plugin><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.8.0</version></plugin><plugin><artifactId>maven-surefire-plugin</artifactId><version>2.22.1</version></plugin><plugin><artifactId>maven-war-plugin</artifactId><version>3.2.2</version></plugin><plugin><artifactId>maven-install-plugin</artifactId><version>2.5.2</version></plugin><plugin><artifactId>maven-deploy-plugin</artifactId><version>2.8.2</version></plugin></plugins></pluginManagement></build>
</project>

创建包结构

常见的src目录结构

controller 存放控制器；service 存放业务接口；impl 存放业务接口或数据访问接口实现类；

dao 存放数据访问接口；domain 存放实体类；util 存放工具类；listener 存放监听器

filter 存放过滤器；config 存放配置

4.开发实体类

即开发domain层，根据数据库表结构创建实体类，alt+insert可生成getter与setter方法

Category类

package net.xdclass.forum.domain;import java.util.Date;public class Category {private int id;private String name;private int weight;private Date createTime;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getWeight() {return weight;}public void setWeight(int weight) {this.weight = weight;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}@Overridepublic String toString() {return "Category{" +"id=" + id +", name='" + name + '\'' +", weight=" + weight +", createTime=" + createTime +'}';}
}

Reply类

package net.xdclass.forum.domain;import java.util.Date;/*`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`topic_id` int(11) DEFAULT NULL,`floor` int(11) DEFAULT NULL COMMENT '楼层编号，回复是不能删除的',`content` varchar(524) DEFAULT NULL COMMENT '回复内容',`user_id` int(11) DEFAULT NULL,`username` varchar(64) DEFAULT NULL COMMENT '回复人名称',`user_img` varchar(128) DEFAULT NULL COMMENT '回复人头像',`create_time` datetime DEFAULT NULL,`update_time` datetime DEFAULT NULL,`delete` int(11) DEFAULT NULL COMMENT '0是正常，1是禁用',*/
public class Reply {private int id;private int topicId;private int floor;private String content;private int userId;private String username;private String userImg;private Date createTime;private Date updateTime;private int delete;@Overridepublic String toString() {return "Reply{" +"id=" + id +", topicId=" + topicId +", floor=" + floor +", content='" + content + '\'' +", userId=" + userId +", username='" + username + '\'' +", userImg='" + userImg + '\'' +", createTime=" + createTime +", updateTime=" + updateTime +", delete=" + delete +'}';}public int getId() {return id;}public void setId(int id) {this.id = id;}public int getTopicId() {return topicId;}public void setTopicId(int topicId) {this.topicId = topicId;}public int getFloor() {return floor;}public void setFloor(int floor) {this.floor = floor;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public int getUserId() {return userId;}public void setUserId(int userId) {this.userId = userId;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getUserImg() {return userImg;}public void setUserImg(String userImg) {this.userImg = userImg;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}public Date getUpdateTime() {return updateTime;}public void setUpdateTime(Date updateTime) {this.updateTime = updateTime;}public int getDelete() {return delete;}public void setDelete(int delete) {this.delete = delete;}
}

Topic类

package net.xdclass.forum.domain;import java.util.Date;/*CREATE TABLE `topic` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`c_id` int(11) DEFAULT NULL COMMENT '分类',`title` varchar(128) DEFAULT NULL COMMENT '标题',`content` varchar(1024) DEFAULT NULL COMMENT '内容',`pv` int(11) DEFAULT NULL COMMENT '浏览量',`user_id` int(11) DEFAULT NULL,`username` varchar(64) DEFAULT NULL,`user_img` varchar(128) DEFAULT NULL,`create_time` datetime DEFAULT NULL,`update_time` datetime DEFAULT NULL,`hot` int(2) DEFAULT '0' COMMENT '是否热门 1是热门',`delete` int(11) DEFAULT '0' COMMENT '0是未删除，1是已经删除',PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;*/
public class Topic {private int id;private int cId;private String title;private String content;private int pv;private int userId;private String username;private String userImg;private Date createTime;private Date updateTime;private int hot;private int delete;public int getId() {return id;}public void setId(int id) {this.id = id;}public int getcId() {return cId;}public void setcId(int cId) {this.cId = cId;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public int getPv() {return pv;}public void setPv(int pv) {this.pv = pv;}public int getUserId() {return userId;}public void setUserId(int userId) {this.userId = userId;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getUserImg() {return userImg;}public void setUserImg(String userImg) {this.userImg = userImg;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}public Date getUpdateTime() {return updateTime;}public void setUpdateTime(Date updateTime) {this.updateTime = updateTime;}public int getHot() {return hot;}public void setHot(int hot) {this.hot = hot;}public int getDelete() {return delete;}public void setDelete(int delete) {this.delete = delete;}@Overridepublic String toString() {return "Topic{" +"id=" + id +", cId=" + cId +", title='" + title + '\'' +", content='" + content + '\'' +", pv=" + pv +", userId=" + userId +", username='" + username + '\'' +", userImg='" + userImg + '\'' +", createTime=" + createTime +", updateTime=" + updateTime +", hot=" + hot +", delete=" + delete +'}';}
}

User 类

package net.xdclass.forum.domain;import java.util.Date;/*** 小滴课堂 开发者论坛  user类* @Author 二当家小D**/
public class User {private int id;private String phone;private String pwd;private int sex;private String img;private Date createTime;private int role;private String username;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}public int getSex() {return sex;}public void setSex(int sex) {this.sex = sex;}public String getImg() {return img;}public void setImg(String img) {this.img = img;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}public int getRole() {return role;}public void setRole(int role) {this.role = role;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}@Overridepublic String toString() {return "User{" +"id=" + id +", phone='" + phone + '\'' +", pwd='" + pwd + '\'' +", sex=" + sex +", img='" + img + '\'' +", createTime=" + createTime +", role=" + role +", username='" + username + '\'' +'}';}
}

5.开发工具类

配置数据连接池工具

database.properties中配置

driverClassName = com.mysql.jdbc.Driver
url = jdbc:mysql://127.0.0.1:3306/forum?useUnicode=true&characterEncoding=utf-8&useSSL=false
username = root
password = xdclass.net
initialSize=10
maxActive=30

DataSourceUtil类

package net.xdclass.forum.util;import org.apache.commons.dbcp2.BasicDataSourceFactory;import javax.sql.DataSource;
import java.io.InputStream;
import java.util.Properties;/*** 数据库连接池工具类*/
public class DataSourceUtil {private static DataSource dataSource;static {try{InputStream in = DataSourceUtil.class.getClassLoader().getResourceAsStream("database.properties");Properties p = new Properties();p.load(in);dataSource = BasicDataSourceFactory.createDataSource(p);}catch (Exception e){e.printStackTrace();throw new ExceptionInInitializerError("初始化DBPC失败");}}/*** 获取连接池* @return*/public static DataSource getDataSource(){return dataSource;}}

配置加密工具

package net.xdclass.forum.util;import java.security.MessageDigest;//MD5加密工具类
public class CommonUtil {public static String MD5(String data)  {try {java.security.MessageDigest md = MessageDigest.getInstance("MD5");byte[] array = md.digest(data.getBytes("UTF-8"));StringBuilder sb = new StringBuilder();for (byte item : array) {sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));}return sb.toString().toUpperCase();} catch (Exception exception) {}return null;}
}

6.开发业务逻辑

Controller层

编写servlet代码：编写通用servlet(BaseServlet，即父类servlet),当子类的Servlet被访问，会调用service方法，若子类没有重写，那么就会调用父类service方法，这样可以简化在每个子类Servlet中重写doget、dopost方法的麻烦。

BaseServlet方法

package net.xdclass.forum.controller;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;@WebServlet(name = "BaseServlet")
public class BaseServlet extends HttpServlet {/*** 子类的Servlet被访问，会调用service方法，子类没有重写，那么就会调用父类service方法** @param req* @param resp* @throws ServletException* @throws IOException*/@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {req.setCharacterEncoding("UTF-8");//获取请求方法String method = req.getParameter("method");if(method!=null){try{//获得当前被访问对象的字节码对象，和字节码对象里面指定的方法Method targetMethod = this.getClass().getMethod(method,HttpServletRequest.class,HttpServletResponse.class);//执行对应的方法：this相当于子类servlet，targetMethod是子类的方法targetMethod.invoke(this,req,resp);}catch (Exception e){e.printStackTrace();}}}
}

子类CategoryServlet中的方法要通过service层来实现

package net.xdclass.forum.controller;import net.xdclass.forum.domain.Category;
import net.xdclass.forum.service.CategoryService;
import net.xdclass.forum.service.impl.CategoryServiceImpl;import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;@WebServlet(name = "categoryServlet",urlPatterns = {"/category"})
public class CategoryServlet extends BaseServlet {private CategoryService categoryService = new CategoryServiceImpl();/*** 返回全部分类* http://localhost:8080/category?method=list*/public void list(HttpServletRequest request, HttpServletResponse response){List<Category> list =  categoryService.list();System.out.println(list.toString());//将查询结果存入request对象中，前端页面发送请求时就可获取数据request.setAttribute("caregoryList",list);}}

前端页面可访问caregoryList获取list中的Category信息，

同理，前端可通过pageContext.request.contextPath来获取上下文路径，并拼接servlet的urlPattern指定访问方法将数据提交给对应的controller类。

service层

service层要通过Dao层来实现

service接口：CategoryService

package net.xdclass.forum.service;import net.xdclass.forum.domain.Category;import java.util.List;public interface CategoryService {/*** 全部分类* @return*/List<Category> list();}

接口对应的实现类：CategoryServiceImpl

package net.xdclass.forum.service.impl;import net.xdclass.forum.dao.CategoryDao;
import net.xdclass.forum.domain.Category;
import net.xdclass.forum.service.CategoryService;import java.util.List;public class CategoryServiceImpl implements CategoryService {//实例化dao对象，对象的调用方法来获取数据库中的数据private CategoryDao categoryDao = new CategoryDao();@Overridepublic List<Category> list() {return categoryDao.list();}
}

dao层

CategoryDao类

package net.xdclass.forum.dao;import net.xdclass.forum.domain.Category;
import net.xdclass.forum.util.DataSourceUtil;
import org.apache.commons.dbutils.*;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;import java.sql.SQLException;
import java.util.List;public class CategoryDao {//通过数据库连接池工具类来，获取queryRunner对象private QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());//开启驼峰映射：将数据库中的下划线命名的字段，映射为驼峰命名的属性private BeanProcessor beanProcessor = new GenerousBeanProcessor();private RowProcessor processor = new BasicRowProcessor(beanProcessor);/*** 根据id找分类* @param id* @return*/public Category findById(int id){//编写sql语句String sql = "select * from category where id=?";//实例化category对象来接收查询结果Category category = null;try {//执行sql语句:BeanHandler将查询结果映射为对象,processor开启驼峰映射,id为占位符的值category  = queryRunner.query(sql,new BeanHandler<>(Category.class,processor),id);} catch (SQLException e) {e.printStackTrace();}return category;//返回查询结果}/*** 返回分类列表* @return*/public List<Category> list(){String sql = "select * from category order by weight desc";List<Category> list  = null;try {list  = queryRunner.query(sql,new BeanListHandler<>(Category.class,processor));} catch (SQLException e) {e.printStackTrace();}return list;}}

7.具体业务模块

开发分页模块

PageDTO：存放分页信息

package net.xdclass.forum.dto;import java.util.List;/*** 泛型* 分页对象*///数据传输对象
public class PageDTO<T> {//存放分页信息/*** 当前页码*/private int pageNumber;/*** 每页显示的记录数*/private int pageSize;/*** 总条数*/private int totalRecord;/*** 总页数*/private int totalPage;/*** 数据集合*/private List<T> list;public PageDTO(int pageNumber, int pageSize, int totalRecord){//更新分页信息this.pageNumber = pageNumber;this.pageSize = pageSize;this.totalRecord = totalRecord;//计算总页数if( totalRecord % pageSize == 0){totalPage = totalRecord/pageSize;}else {totalPage = totalRecord/pageSize + 1;}}public int getPageNumber() {return pageNumber;}public void setPageNumber(int pageNumber) {this.pageNumber = pageNumber;}public int getPageSize() {return pageSize;}public void setPageSize(int pageSize) {this.pageSize = pageSize;}public int getTotalRecord() {return totalRecord;}public void setTotalRecord(int totalRecord) {this.totalRecord = totalRecord;}public int getTotalPage() {return totalPage;}public void setTotalPage(int totalPage) {this.totalPage = totalPage;}public List<T> getList() {return list;}public void setList(List<T> list) {this.list = list;}@Overridepublic String toString() {return "PageDTO{" +"pageNumber=" + pageNumber +", pageSize=" + pageSize +", totalRecord=" + totalRecord +", totalPage=" + totalPage +", list=" + list +'}';}
}

servlet层开发：TopicServlet页面

package net.xdclass.forum.controller;import net.xdclass.forum.domain.Reply;
import net.xdclass.forum.domain.Topic;
import net.xdclass.forum.domain.User;
import net.xdclass.forum.dto.PageDTO;
import net.xdclass.forum.service.CategoryService;
import net.xdclass.forum.service.TopicService;
import net.xdclass.forum.service.impl.CategoryServiceImpl;
import net.xdclass.forum.service.impl.TopicServiceImpl;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet(name = "topicServlet",urlPatterns = {"/topic"})
public class TopicServlet extends BaseServlet {private TopicService topicService = new TopicServiceImpl();private CategoryService categoryService = new CategoryServiceImpl();/*** 默认分页大小*/private static final int pageSize = 5;/*** http://localhost:8080/topic?method=list&c_id=2&page=2** topic分页接口* @param request* @param response*/public void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//获取并更新分页信息int cId = Integer.parseInt(request.getParameter("c_id"));//前端传过来的信息//默认第一页int page=1;String currentPage = request.getParameter("page");if(currentPage !=null && currentPage !=""){page = Integer.parseInt(currentPage);}//获取分页数据:通过调用service层实现的业务方法来实现PageDTO<Topic> pageDTO =  topicService.listTopicPageByCid(cId,page,pageSize);System.out.println(pageDTO.toString());//更新数据request.getSession().setAttribute("categoryList",categoryService.list());request.setAttribute("topicPage" ,pageDTO);//将数据转发给index.jsp页面request.getRequestDispatcher("/index.jsp").forward(request,response);}//获得topic分页数据:通过调用service层实现的业务方法来实现Topic topic = topicService.findById(topicId);PageDTO<Reply> pageDTO =  topicService.findReplyPageByTopicId(topicId,page,pageSize);System.out.println(pageDTO.toString());//更新数据request.setAttribute("topic" ,topic);request.setAttribute("replyPage",pageDTO);//将数据转发给topic_detail.jsp页面request.getRequestDispatcher("/topic_detail.jsp").forward(request,response);}
}

service层：在接口编写业务逻辑，在实现类中实现业务逻辑

TopicService接口

package net.xdclass.forum.service;import net.xdclass.forum.domain.Reply;
import net.xdclass.forum.domain.Topic;
import net.xdclass.forum.domain.User;
import net.xdclass.forum.dto.PageDTO;public interface TopicService  {//在接口编写业务逻辑，在实现类中实现业务逻辑//分页查询PageDTO<Topic> listTopicPageByCid(int cId, int page, int pageSize);//根据id查询Topic findById(int topicId);
}

TopicServiceImpl实现类：通过dao层的方法来获取数据库中的数据

package net.xdclass.forum.service.impl;import net.xdclass.forum.dao.CategoryDao;
import net.xdclass.forum.dao.ReplyDao;
import net.xdclass.forum.dao.TopicDao;
import net.xdclass.forum.domain.Category;
import net.xdclass.forum.domain.Reply;
import net.xdclass.forum.domain.Topic;
import net.xdclass.forum.domain.User;
import net.xdclass.forum.dto.PageDTO;
import net.xdclass.forum.service.TopicService;import java.util.Date;
import java.util.List;public class TopicServiceImpl implements TopicService {
//实现具体的业务逻辑//实例化dao对象，调用对象的方法来获取数据库中的数据private TopicDao topicDao = new TopicDao();private ReplyDao replyDao = new ReplyDao();private CategoryDao categoryDao = new CategoryDao();@Overridepublic PageDTO<Topic> listTopicPageByCid(int cId, int page, int pageSize) {//查询总记录数int totalRecordNum = topicDao.countTotalTopicByCid(cId);int from = (page-1) * pageSize;//起始位置//分页查询List<Topic> topicList =  topicDao.findListByCid(cId,from,pageSize);PageDTO<Topic> pageDTO = new PageDTO<>(page,pageSize,totalRecordNum);pageDTO.setList(topicList);return pageDTO;}@Overridepublic Topic findById(int topicId) {return topicDao.findById(topicId);}@Overridepublic PageDTO<Reply> findReplyPageByTopicId(int topicId, int page, int pageSize) {//查询总的回复int totalRecordNum = replyDao.countTotalReplyByCid(topicId);int from = (page-1) * pageSize;//设置起始位置//分页查询List<Reply> replyList =  replyDao.findListByTopicId(topicId,from,pageSize);PageDTO<Reply> pageDTO = new PageDTO<>(page,pageSize,totalRecordNum);pageDTO.setList(replyList);return pageDTO;}}

dao层：

package net.xdclass.forum.dao;import net.xdclass.forum.domain.Topic;
import net.xdclass.forum.util.DataSourceUtil;
import org.apache.commons.dbutils.*;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;import java.sql.SQLException;
import java.util.List;public class TopicDao {//由数据库连接池获取实例化queryRunner对象private QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());//开启驼峰映射：数据库字段和java属性的映射，实现数据库字段的下划线会被去掉，并且首字母大写private BeanProcessor beanProcessor = new GenerousBeanProcessor();private RowProcessor processor = new BasicRowProcessor(beanProcessor);/*** 根据cid查询总行数* @param cId* @return*/public int countTotalTopicByCid(int cId) {//String sql = "select count(*) from topic where c_id=? and `delete`=0";Long count = null;try {count =  (Long)queryRunner.query(sql,new ScalarHandler<>(),cId);} catch (SQLException e) {e.printStackTrace();}return count.intValue();}/*** 分页查询* @param cId* @param from* @param pageSize* @return*/public List<Topic> findListByCid(int cId, int from, int pageSize) {String sql = "select * from topic where c_id=? and `delete`=0 order by update_time desc limit ?,?";List<Topic> list = null;try{//查询结果集:BeanListHandler 结果集映射成一个对象的集合,processor：开启驼峰映射,cId：占位符的值，from：起始位置，pageSize：每页的记录数list = queryRunner.query(sql,new BeanListHandler<>(Topic.class,processor),cId,from,pageSize);}catch (Exception e){e.printStackTrace();}return list;}public Topic findById(int topicId) {String sql = "select * from topic where id = ?";Topic topic = null;try{topic = queryRunner.query(sql,new BeanHandler<>(Topic.class,processor),topicId);}catch (Exception e){e.printStackTrace();}return  topic;}
}

登录注册模块

service接口

package net.xdclass.forum.service;import net.xdclass.forum.domain.User;public interface UserService {int register(User user);User login(String phone, String pwd);
}

接口实现类

package net.xdclass.forum.service.impl;import net.xdclass.forum.dao.UserDao;
import net.xdclass.forum.domain.User;
import net.xdclass.forum.service.UserService;
import net.xdclass.forum.util.CommonUtil;import java.util.Date;
import java.util.Random;public class UserServiceImpl implements UserService {private UserDao userDao = new UserDao();@Overridepublic int register(User user) {user.setRole(1);user.setCreateTime(new Date());user.setImg(getRandomImg());user.setPwd( CommonUtil.MD5(user.getPwd()) );//加密try {return userDao.save(user);} catch (Exception e) {e.printStackTrace();}return 0;}@Overridepublic User login(String phone, String pwd) {String md5pwd = CommonUtil.MD5(pwd);User user = userDao.findByPhoneAndPwd(phone,md5pwd);return user;}/*** 放在CDN上的随机头像*/private static final String [] headImg = {"https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/12.jpeg","https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/11.jpeg","https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/13.jpeg","https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/14.jpeg","https://xd-video-pc-img.oss-cn-beijing.aliyuncs.com/xdclass_pro/default/head_img/15.jpeg"};private String getRandomImg(){int size =  headImg.length;Random random = new Random();int index = random.nextInt(size);return headImg[index];}
}

数据库访问接口dao层

package net.xdclass.forum.dao;import net.xdclass.forum.domain.User;
import net.xdclass.forum.util.DataSourceUtil;
import org.apache.commons.dbutils.*;
import org.apache.commons.dbutils.handlers.BeanHandler;public class UserDao {private QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());//开启驼峰映射private BeanProcessor beanProcessor = new GenerousBeanProcessor();private RowProcessor processor = new BasicRowProcessor(beanProcessor);public int save(User user) throws Exception {String sql = "insert into user (phone,pwd,sex,img,create_time,role,username) values(?,?,?,?,?,?,?)";Object[] params = {user.getPhone(),user.getPwd(),user.getSex(),user.getImg(),user.getCreateTime(),user.getRole(),user.getUsername()};int i ;try{i = queryRunner.update(sql,params);}catch (Exception e){e.printStackTrace();throw new Exception();}return i;}public User findByPhoneAndPwd(String phone, String md5pwd) {String sql = "select * from user where phone=? and pwd=?";User user = null;try{user = queryRunner.query(sql,new BeanHandler<>(User.class,processor),phone,md5pwd);}catch (Exception e){e.printStackTrace();}return user;}
}

servlet控制层

获得前端提交的数据，并实现页面跳转

package net.xdclass.forum.controller;import net.xdclass.forum.domain.User;
import net.xdclass.forum.service.UserService;
import net.xdclass.forum.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;@WebServlet(name = "userServlet",urlPatterns = {"/user"})
public class UserServlet extends BaseServlet {private UserService userService = new UserServiceImpl();/**** http://localhost:8080/user?method=login** @param request* @param response*/public void login(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {String phone = request.getParameter("phone");String pwd = request.getParameter("pwd");User user = userService.login(phone,pwd);if(user != null){request.getSession().setAttribute("loginUser",user);//跳转页面response.sendRedirect("/topic?method=list&c_id=1");}else {request.setAttribute("msg","用户名或者密码不正确");request.getRequestDispatcher("/user/login.jsp").forward(request,response);}}/***  http://localhost:8080/user?method=logout* 退出登录* @param request* @param response*/public void  logout(HttpServletRequest request,HttpServletResponse response) throws IOException {request.getSession().invalidate();response.sendRedirect("/topic?method=list&c_id=1");}/*** http://localhost:8080/user?method=register* @param request* @param response*/public void register(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {User user = new User();Map<String,String[]> map = request.getParameterMap();try {BeanUtils.populate(user,map);} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}int i = userService.register(user);if(i>0){//注册成功，跳转到登录界面request.getRequestDispatcher("/user/login.jsp").forward(request,response);}else {//注册失败，跳转到注册页面request.getRequestDispatcher("/user/register.jsp").forward(request,response);}}}

获取全部分类

service接口

package net.xdclass.forum.service;import net.xdclass.forum.domain.Category;import java.util.List;public interface CategoryService {/*** 全部分类* @return*/List<Category> list();}

接口对应的实现类

package net.xdclass.forum.service.impl;import net.xdclass.forum.dao.CategoryDao;
import net.xdclass.forum.domain.Category;
import net.xdclass.forum.service.CategoryService;import java.util.List;public class CategoryServiceImpl implements CategoryService {//实例化dao对象，对象的调用方法来获取数据库中的数据private CategoryDao categoryDao = new CategoryDao();@Overridepublic List<Category> list() {return categoryDao.list();}
}

数据库访问接口

package net.xdclass.forum.dao;import net.xdclass.forum.domain.Category;
import net.xdclass.forum.util.DataSourceUtil;
import org.apache.commons.dbutils.*;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;import java.sql.SQLException;
import java.util.List;public class CategoryDao {//通过数据库连接池工具类来，获取queryRunner对象private QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());//开启驼峰映射：将数据库中的下划线命名的字段，映射为驼峰命名的属性private BeanProcessor beanProcessor = new GenerousBeanProcessor();private RowProcessor processor = new BasicRowProcessor(beanProcessor);/*** 返回分类列表* @return*/public List<Category> list(){String sql = "select * from category order by weight desc";List<Category> list  = null;try {list  = queryRunner.query(sql,new BeanListHandler<>(Category.class,processor));} catch (SQLException e) {e.printStackTrace();}return list;}}

控制层

将查询数据存入请求中，供前端使用

package net.xdclass.forum.controller;import net.xdclass.forum.domain.Category;
import net.xdclass.forum.service.CategoryService;
import net.xdclass.forum.service.impl.CategoryServiceImpl;import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;@WebServlet(name = "categoryServlet",urlPatterns = {"/category"})
public class CategoryServlet extends BaseServlet {private CategoryService categoryService = new CategoryServiceImpl();/*** 返回全部分类* http://localhost:8080/category?method=list*/public void list(HttpServletRequest request, HttpServletResponse response){List<Category> list =  categoryService.list();System.out.println(list.toString());//将查询结果存入request对象中，前端页面发送请求时就可获取数据request.setAttribute("caregoryList",list);}}

其它功能模块也同理开发。

8.前端页面部署

环境部署

前端页面技术 bootstrap + jsp，参考地址：Bootstrap中文网

项目结构

去官网添加js与css依赖

前端页面基础

引用样式文件和响应式布局

<%--声明相关的引入--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html>
<head><title>开发者论坛</title><meta name="viewport" content="width=device-width, initial-scale=1"><%-- contextPath获取当前web应用的上下文路径，用于动态生成url资源访问路径--%><link rel="stylesheet" href="${pageContext.request.contextPath}/static/bootstrap.min.css"><script src="${pageContext.request.contextPath}/static/bootstrap.min.js"></script><script src="${pageContext.request.contextPath}/static/jquery.min.js"></script></head>

pom.xml文件添加

<!-- https://mvnrepository.com/artifact/taglibs/standard -->
<dependency><groupId>taglibs</groupId><artifactId>standard</artifactId><version>1.1.2</version>
</dependency>


<!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
<dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version>
</dependency>

在web.xml文件中修改版本

<web-app  version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

前端页面开发

前端样式可去Bootstrap官网复制，项目结构：

主题列表开发

index.jsp

<%--导航栏：将分类信息遍历显示--%><ul class="nav nav-tabs"><c:forEach items="${categoryList}" var="category"><li><a href="${pageContext.request.contextPath}/topic?method=list&c_id=${category.id}"> ${category.name}</a></li></c:forEach><%-- 注册登录页面跳转--%><c:choose><c:when test="${empty loginUser}"><li style="float: right"> <a href="${pageContext.request.contextPath}/user/register.jsp"> 注册</a> </li><li style="float: right"> <a href="${pageContext.request.contextPath}/user/login.jsp"> 登录</a> </li></c:when><%-- 登录成功页面跳转 --%><c:otherwise><li style="float: right"> <a href="${pageContext.request.contextPath}/user?method=logout">注销</a> </li><li style="float: right"> <a href="#">${loginUser.username}</a> </li><li style="float: right"> <img src="${loginUser.img}" class="img-circle" width="25px" height="25px" style="margin-top: 8.5px"></li><li style="float: right"> <a href="${pageContext.request.contextPath}/publish.jsp">发布主题</a> </li></c:otherwise></c:choose></ul>

通过后端传入请求中的数据信息，实现前端数据展示

通过动态生成url路径执行对应方法或者跳转对应页面

效果图

index.js内容详情展示

<table class="table table-striped"><thead><tr><th>标题</th><th>内容</th><th>作者</th><th>发布时间</th><th>操作</th></tr></thead><tbody><c:forEach items="${topicPage.list}" var="topic"><tr><td>${topic.title}</td><td>${topic.content}</td><td>${topic.username}</td><td>${topic.createTime}</td><td><a href="${pageContext.request.contextPath}/topic?method=findDetailById&topic_id=${topic.id}" >详情</a></td></tr></c:forEach></tbody></table><ul class="pagination"><li><a href="#">&laquo;</a> </li><c:if test="${topicPage.totalPage>0}"><c:forEach var="i" begin="0" end="${topicPage.totalPage-1}" step="1"><li><a href="${pageContext.request.contextPath}/topic?method=list&c_id=${param.c_id}&page=${i+1}">${i+1} </a></li></c:forEach></c:if><li><a href="#">&raquo;</a> </li></ul>

效果

登录前

登录后

登录页面

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html>
<head><title>小滴课堂开发者论坛</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="${pageContext.request.contextPath}/static/bootstrap.min.css"><script src="${pageContext.request.contextPath}/static/bootstrap.min.js"></script><script src="${pageContext.request.contextPath}/static/jquery.min.js"></script></head>
<body><%--头部目录--%>
<div class="container"><ul class="nav nav-tabs"><c:forEach items="${categoryList}" var="category"><li><a href="${pageContext.request.contextPath}/topic?method=list&c_id=${category.id}">${category.name}</a></li></c:forEach></ul>
</div><div style="margin-top: 100px"><form class="form-horizontal" role="form" action="/user?method=login" method="post"><div class="form-group"><label class="col-sm-2 control-label">手机号</label><div class="col-lg-3"><input type="text" class="form-control" name="phone" placeholder="手机号"></div></div><div class="form-group"><label class="col-sm-2 control-label">密码</label><div class="col-lg-3"><input type="password" class="form-control" name="pwd"placeholder="密码"></div></div><div class="form-group"><div class="col-sm-offset-2 col-sm-10"><button type="submit" class="btn btn-default">登录</button></div></div><div class="form-group"><div class="col-lg-3">${msg}</div></div></form></div></body>
</html>