springmvc实现文件上传
文件上传的准备
导入文件上传的jar包
<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.4</version></dependency>
编写文件上传的JSP页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>文件上传</title>
</head>
<body>
<h3>文件上传</h3>
<form action="/fileupload.do" method="post" enctype="multipart/form-data">选择文件:<input type="file" name="upload" /><br/><input type="submit" value="上传" /></form>
</body>
</html>
springmvc传统方式文件上传
配置文件解析器对象 springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd">
<!--如果<url-pattern>/</url-pattern>,任何资源都会拦截--><!--配置哪些资源不被拦截<mvc:resources mapping="/js/" location="/js/**" /><mvc:resources mapping="/css/" location="/css/**" /><mvc:resources mapping="/image/" location="/image/**" />-->
<!--配置了内容,启动Tomcat服务器的时候,就会被加载--><!--配置注解扫描--><context:component-scan base-package="com.qcbyjy" />
<!--配置视图解析器,进行页面的跳转--><bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!--跳转的页面的路径--><property name="prefix" value="/pages/" /><!--跳转页面的后缀名称--><property name="suffix" value=".jsp" /></bean>
<!--配置文件上传的解析器组件。id的名称是固定,不能乱写--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!--设置上传文件的总大小 8M = 8 * 1024 * 1024 --><property name="maxUploadSize" value="8388608" /></bean>
<!--让映射器、适配器和处理器生效(默认不配置也是可以的)--><mvc:annotation-driven/>
</beans>
springmvc框架提供了MultipartFile对象,该对象表示上传的文件,要求变量名称必须和表单file标签的name属性名称相同。
代码如下:
package cn.tx.demo2;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.UUID;
/**** 老师* 文件上传*/
@Controller
public class UploadController {
/*** 文件上传** MultipartFile upload 文件上传解析器对象解析request后,文件上传对象** @return*/@RequestMapping("/fileupload.do")public String upload(MultipartFile upload, HttpServletRequest request) throws IOException {// 把文件上传到哪个位置String realPath = request.getSession().getServletContext().getRealPath("/uploads");// 创建该文件夹File file = new File(realPath);// 判断该文件夹是否存在if(!file.exists()){// 创建文件夹file.mkdirs();}
// 获取到上传文件的名称String filename = upload.getOriginalFilename();
// 把文件的名称修改成为一的值 sdfs-csdf-fwer-sdfwString uuid = UUID.randomUUID().toString().replace("-", "").toUpperCase();// 唯一的值filename = uuid+"_"+filename;System.out.println("文件名称:"+filename);
// 上传文件upload.transferTo(new File(file,filename));
return "suc";}
}