在 Spring Boot 中使用 JSP

jsp？ 好多年没用了。重新整一下 还费了点时间，记录一下。

项目结构：

pom:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.5.0</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.mg</groupId><artifactId>his5</artifactId><version>0.0.1-SNAPSHOT</version><name>his5</name><description>his5</description><packaging>war</packaging><url/><licenses><license/></licenses><developers><developer/></developers><scm><connection/><developerConnection/><tag/><url/></scm><properties><java.version>17</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.apache.tomcat.embed</groupId><artifactId>tomcat-embed-jasper</artifactId><scope>provided</scope></dependency><dependency><groupId>jakarta.servlet.jsp</groupId><artifactId>jakarta.servlet.jsp-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><dependency><groupId>jakarta.servlet</groupId><artifactId>jakarta.servlet-api</artifactId><version>6.0.0</version><scope>provided</scope></dependency><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

 配置文件中值得注意的地方如下，老版本springboot得用另外的包：

      <dependency><groupId>jakarta.servlet.jsp</groupId><artifactId>jakarta.servlet.jsp-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency>

在 Spring Boot 支持的嵌入式容器中只有 Tomcat 支持使用 JSP，Undertow 和 Jetty 均不支持！

application.yml:  

spring:application:name : "his5"mvc:view:prefix: "/WEB-INF/views/"suffix: ".jsp"

 prefix: "/WEB-INF/views/"  是相对于webapp 的根目录起步的！

配置webapp 的根目录的地方如下：

controler:

package com.mg.his5.mvc;import com.mg.his5.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;//restful @RestController class
@Controller
@RequestMapping("/his")
public class MvcController {@GetMapping("/hello")@ResponseBodypublic String hello() {return "Hello, MVC!";}@GetMapping("/")public ModelAndView index () {return new ModelAndView("index/index");}//return user information function@GetMapping("/user")@ResponseBodypublic User getUser(){User u= new User();u.setUsername("testUser");u.setPassword("testPassword");return u;}}

不过 我觉得更好的办法是吧web 作为一个独立的模块，那样项目结构是不是更清晰呢

如下图启动项目：

test: