开始需要在pom.xml加入几个jar,分别是
<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>
接下来，在Springmvc的配置加入上传文件的配置（PS：我把springmvc的完整配置都展现出来）：
<!--默认的mvc注解映射的支持 -->
<mvc:annotation-driven/>
<!-- 处理对静态资源的请求 -->
<mvc:resources location="/static/" mapping="/static/**" />
<!-- 扫描注解 -->
<context:component-scan base-package="com.ztz.springmvc.controller"/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!-- 后缀 -->
<property name="suffix" value=".jsp"/>
</bean>
<!-- 上传文件 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"/>
<!-- 最大内存大小 -->
<property name="maxInMemorySize" value="10240"/>
<!-- 最大文件大小，-1为不限制大小 -->
<property name="maxUploadSize" value="-1"/>
</bean>
一、 单文件上传
当然在一个表单中，需要添加enctype="multipart/form-data"，一个表单有文件域，肯定也有基本的文本框，可以一次性提交，springmvc能给我们区别出来，来做不同的处理。首先看下普通的model
package com.ztz.springmvc.model; public class Users { private String name; private String password; //省略get set方法 //重写toString()方便测试 @Override public String toString() { return "Users [name=" + name + ", password=" + password + "]"; } }
这个是表单的JSP页面：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; request.setAttribute("basePath", basePath); %> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>FileUpload</title> </head> <body> <form action="${basePath}file/upload" method="post" enctype="multipart/form-data"> <label>用户名：</label><input type="text" name="name"/><br/> <label>密 码：</label><input type="password" name="password"/><br/> <label>头 像</label><input type="file" name="file"/><br/> <input type="submit" value="提 交"/> </form> </body> </html>
上传成功跳转的JSP页面，并且显示出上传图片：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; request.setAttribute("basePath", basePath); %> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>头像</title> </head> <body> <img src="${basePath}${imagesPath}"> </body> </html>
最后是Controller：
package com.ztz.springmvc.controller; import java.io.File; import java.util.UUID; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import com.ztz.springmvc.model.Users; @Controller @RequestMapping("/file") public class FileUploadController { @RequestMapping(value="/upload",method=RequestMethod.POST) private String fildUpload(Users users ,@RequestParam(value="file",required=false) MultipartFile file, HttpServletRequest request)throws Exception{ //基本表单 System.out.println(users.toString()); //获得物理路径webapp所在路径 String pathRoot = request.getSession().getServletContext().getRealPath(""); String path=""; if(!file.isEmpty()){ //生成uuid作为文件名称 String uuid = UUID.randomUUID().toString().replaceAll("-",""); //获得文件类型（可以判断如果不是图片，禁止上传） String contentType=file.getContentType(); //获得文件后缀名称 String imageName=contentType.substring(contentType.indexOf("/")+1); path="/static/images/"+uuid+"."+imageName; file.transferTo(new File(pathRoot+path)); } System.out.println(path); request.setAttribute("imagesPath", path); return "success"; } //因为我的JSP在WEB-INF目录下面，浏览器无法直接访问 @RequestMapping(value="/forward") private String forward(){ return "index"; } }
点击提交控制台输出：
Users [name=fileupload, password=test]
二、 多图片上传
springmvc实现多图片上传也很简单，我们把刚才的例子修改下，在加一个文件域，name的值还是相同
<body> <form action="${basePath}file/upload" method="post" enctype="multipart/form-data"> <label>用户名：</label><input type="text" name="name"/><br/> <label>密 码：</label><input type="password" name="password"/><br/> <label>头 像1</label><input type="file" name="file"/><br/> <label>头 像2</label><input type="file" name="file"/><br/> <input type="submit" value="提 交"/> </form> </body>
展示图片来个循环，以便显示多张图片
<body> <c:forEach items="${imagesPathList}" var="image"> <img src="${basePath}${image}"><br/> </c:forEach> </body>
控制层代码如下：
package com.ztz.springmvc.controller; import java.io.File; import java.util.ArrayList; import java.util.List; import java.util.UUID; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import com.ztz.springmvc.model.Users; @Controller @RequestMapping("/file") public class FileUploadController { @RequestMapping(value="/upload",method=RequestMethod.POST) private String fildUpload(Users users ,@RequestParam(value="file",required=false) MultipartFile[] file, HttpServletRequest request)throws Exception{ //基本表单 System.out.println(users.toString()); //获得物理路径webapp所在路径 String pathRoot = request.getSession().getServletContext().getRealPath(""); String path=""; List<String> listImagePath=new ArrayList<String>(); for (MultipartFile mf : file) { if(!mf.isEmpty()){ //生成uuid作为文件名称 String uuid = UUID.randomUUID().toString().replaceAll("-",""); //获得文件类型（可以判断如果不是图片，禁止上传） String contentType=mf.getContentType(); //获得文件后缀名称 String imageName=contentType.substring(contentType.indexOf("/")+1); path="/static/images/"+uuid+"."+imageName; mf.transferTo(new File(pathRoot+path)); listImagePath.add(path); } } System.out.println(path); request.setAttribute("imagesPathList", listImagePath); return "success"; } //因为我的JSP在WEB-INF目录下面，浏览器无法直接访问 @RequestMapping(value="/forward") private String forward(){ return "index"; } }
