使用springMVC包裝的解析器（CommonsMultipartResolver）進行文件上傳控制 需要引入 apache的 common-fileupload組件包
1：使用表單post提交
input.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'input.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="${pageContext.request.contextPath}/uploads.action" enctype="multipart/form-data" method="post">
<input type="file" name="myFile"/>
<input type="submit" value="提交">
<a href="${pageContext.request.contextPath}/fileDowload.action?fileName=a.txt">下載</a>
</form>
</body>
</html>
2：springmvc配置文件中添加文件解析器：
ps:名稱必須使用 multipartResolver 因爲spring容器使用名稱注入 文件上傳解析器
<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
">
<context:component-scan base-package="cn"></context:component-scan>
<!-- 文件解析器 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxInMemorySize" value="1048576"></property>
</bean>
</beans>3.文件上傳和下載
package cn.zj.mvc.lesson02;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletResponse;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class DownUpload {
public String filePath="E:/class/springmvc/upload/";
@RequestMapping(value="/uploads")
public String fileUpload(@RequestParam("myFile") MultipartFile file,HttpServletResponse response) throws IllegalStateException, IOException{
//file.getOriginalFilename() 是獲取文件名
File upFile=new File(filePath+file.getOriginalFilename());
file.transferTo(upFile);
response.getWriter().println("succeed");
return null;
}
@RequestMapping(value="/fileDowload")
public ResponseEntity<byte[]> fileDowload(String fileName) throws Exception{
/**
* 需要注意的 跳轉方式必須是form表單 ，且爲post方式提交
*/
//需要下載的目標文件
File file=new File(filePath+fileName);
//讀取目標文件爲二進制數組
byte[] fileByte=FileCopyUtils.copyToByteArray(file);
//設置響應頭
HttpHeaders hh=new HttpHeaders();
//設置下載的文件的名稱 且轉碼
hh.setContentDispositionFormData("attachment", URLEncoder.encode(fileName, "UTF-8"));
/*
* 構建ResponseEntity對象
* 1：傳入文件字節數組
* 2： 文件名
* 3：狀態碼 HttpStatus.CREATED =200
*/
ResponseEntity<byte[]> re=new ResponseEntity<byte[]>(fileByte, hh, HttpStatus.CREATED);
return re;
}
}