SpringMVC上传文件的两种方法

在该示例中，阐述了SpringMVC如何上传文件。
1、上传页面upload.jsp

									<body> 

									  <form action="/TestSpringMVC3/data/uploadfile" enctype="multipart/form-data" method="post"> 

									    file:<input type="file" name="file"><br> 

									    <input type="submit" value="upload file"> 

									  </form> 

									</body>

2、controller配置文件

									<?xml version="1.0" encoding="UTF-8"?> 

									<beans xmlns="http://www.springframework.org/schema/beans"

									    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

									    xmlns:mvc="http://www.springframework.org/schema/mvc"

									    xmlns:p="http://www.springframework.org/schema/p"

									    xmlns:context="http://www.springframework.org/schema/context"

									    xmlns:aop="http://www.springframework.org/schema/aop"

									    xmlns:tx="http://www.springframework.org/schema/tx"

									    xsi:schemaLocation="http://www.springframework.org/schema/beans 

									      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 

									      http://www.springframework.org/schema/context  

									      http://www.springframework.org/schema/context/spring-context-3.0.xsd 

									      http://www.springframework.org/schema/aop  

									      http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 

									      http://www.springframework.org/schema/tx  

									      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 

									      http://www.springframework.org/schema/mvc  

									      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 

									      http://www.springframework.org/schema/context  

									      http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 

									  <!-- 

									    使Spring支持自动检测组件，如注解的Controller 

									  -->

									  <context:component-scan base-package="cn.com.yy.controller"/> 

									  <!-- 开启注解配置 -->

									  <mvc:annotation-driven/> 

									  <!-- 支持JSP JSTL的解析器 -->

									  <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 

									    <property name="prefix" value="/WEB-INF/page/"/> 

									    <property name="suffix" value=".jsp"/> 

									   </bean> 

									   <!-- 配置文件上传解析器 -->

									   <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 

									    <property name="defaultEncoding" value="utf-8"/> 

									    <property name="maxUploadSize" value="10485760000"/> 

									    <property name="maxInMemorySize" value="40960"/> 

									   </bean> 

									</beans>

主要是添加了文件上传的解析器，配置了默认编码，最大的上传大小以及缓存大小等参数。

3、Controller

									package cn.com.yy.controller; 

									import java.io.File; 

									import java.io.FileNotFoundException; 

									import java.io.FileOutputStream; 

									import java.io.IOException; 

									import java.io.InputStream; 

									import java.io.OutputStream; 

									import org.springframework.stereotype.Controller; 

									import org.springframework.web.bind.annotation.RequestMapping; 

									import org.springframework.web.bind.annotation.RequestParam; 

									import org.springframework.web.multipart.commons.CommonsMultipartFile; 

									@Controller

									@RequestMapping("/data") 

									public class FileUploadController { 

									  /** 

									   * method1:通过参数CommonsMultipartFile进行解析 

									   * @RequestParam("file")中的file对应于upload.jsp中的file类型的name对应的名称 

									   * @param file 

									   * @return 

									   * @throws IOException 

									   */

									  @RequestMapping(value="/uploadfile") 

									  public String upload1(@RequestParam("file") CommonsMultipartFile file) throws IOException{ 

									    //获取文件名称 

									    String fileName = file.getOriginalFilename(); 

									    //写入本地磁盘 

									    InputStream is = file.getInputStream(); 

									    byte[] bs = new byte[1024]; 

									    int len; 

									    OutputStream os = new FileOutputStream(new File("D:/temp/" + fileName)); 

									    while ((len = is.read(bs)) != -1) { 

									      os.write(bs, 0, len); 

									    } 

									    os.close(); 

									    is.close(); 

									    return "upload_success"; 

									  } 

									  @RequestMapping("/upload") 

									  public String toPage(){ 

									    return "upload"; 

									  } 

									}

4、返回页面upload_success.jsp

									<body> 

									  upload file success!! 

									</body> 

5、测试

访问 http://localhost:8080/TestSpringMVC3/data/upload 跳转到上传页面

SpringMVC上传文件的两种方法

选择文件上传

SpringMVC上传文件的两种方法

点击上传会跳转到上传成功页面。

上述方法只是简单的讲解了SpringMVC如何上传文件。

第二种方法：使用SpringMVC封装的方法进行文件上传

									/** 

									   * 使用SpringMVC封装好的方法进行文件上传 

									   * @param request 

									   * @param response 

									   * @throws IllegalStateException 

									   * @throws IOException 

									   */

									  @RequestMapping("/uploadfile2") 

									  public void upload2(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException{ 

									    //获取解析器 

									    CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext()); 

									    //判断是否是文件 

									    if(resolver.isMultipart(request)){ 

									      //进行转换 

									      MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)(request); 

									      //获取所有文件名称 

									      Iterator<String> it = multiRequest.getFileNames(); 

									      while(it.hasNext()){ 

									        //根据文件名称取文件 

									        MultipartFile file = multiRequest.getFile(it.next()); 

									        String fileName = file.getOriginalFilename(); 

									        String localPath = "D:/temp/" + fileName; 

									        File newFile = new File(localPath); 

									        //上传的文件写入到指定的文件中 

									        file.transferTo(newFile); 

									      } 

									    } 

									  }