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

选择文件上传

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);
      }
    }
  }

该方法上传文件效率更优。

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