使用SMM框架开发企业级应用-----mvc文件上传和下载

SpringMVC通过MultipartResolver（多部件解析器）对象实现对文件上传的支持。

MultipartResolver是一个接口对象，需要通过它的实现类CommonsMultipartResolver来完成文件的上传工作。

1.使用MultipartResolver对象，在XML中配置Bean.

  <?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:context="http://www.springframework.org/schema/context"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-4.3.xsd">
      <context:annotation-config/>
     <context:component-scan base-package="com.wxy.controller"/>
     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8" />
         <property name="maxUploadSize" value="2097152" />
     </bean>
 </beans>

2.fileUpload.jsp上传页面

  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
  <head>
      <title>文件上传</title>
      <script>
          <%--判断是否填写上传人并已经选择上传文件--%>
          function check() {
              var name = document.getElementById("name").value();
              var name = document.getElementById("file").value();
             if(name==""){
                 alert("请填写上传人");
                 return false;
             }
            if(file.length==0||file==""){
                 alert("请选择上传文件");
                 return false;
             }
             return true;
         }
     </script>
 </head>
 <body>
 <%--enctype="multipart/form-data"采用二进制流处理表单数据--%>
 <form action="${pageContext.request.contextPath}/fileUpload.action" method="post" enctype="multipart/form-data" onsubmit="return check()">
     上传人：<input id="name" type="text" name="name"/><br/>
     请选择文件：<input id="file" type="file" name="uploadfile" multiple="multiple"/><br/>
     <%--multiple属性选择多个文件上传--%>
     <input type="submit" value="文件上传" />
 </form>
 </body>
 </html>

3.fileDownload.jsp下载页面

 <%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
 <%@ page import="java.net.URLEncoder" %>
  <html>
  <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>文件下载</title>
 </head>
 <body>
 <a href="${pageContext.request.contextPath}/download.action?filename=<%=URLEncoder.encode("图像.txt","UTF-8")%>">文件下载</a>
 </body>
 </html>

4.FileUploadAndDownloadController.java文件上传和下载控制器类

复制代码
 使用SMM框架开发企业级应用----- package com.wxy.controller;
  mport org.apache.commons.io.FileUtils;
  import org.springframework.http.HttpHeaders;
  import org.springframework.http.HttpStatus;
  import org.springframework.http.MediaType;
  import org.springframework.http.ResponseEntity;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.multipart.MultipartFile; 
 import javax.servlet.http.HttpServletRequest;
 import java.io.File;
 import java.net.URLEncoder;
 import java.util.List;
 import java.util.UUID;
 
 @Controller("controller")
 public class FileUploadAndDownloadController {
     @RequestMapping("/tofileUpload")
     public String toupload(){
         return "fileUpload";
     }
     @RequestMapping("/tofiledownload")
     public String todownload(){
         return "download";
     }
     @RequestMapping("/fileUpload.action")
     public String handleFormUpload(@RequestParam("name") String name,
                                    @RequestParam("uploadfile") List<MultipartFile> uploadfile, HttpServletRequest request) {
         if (!uploadfile.isEmpty() && uploadfile.size() > 0) {
             for (MultipartFile file : uploadfile) {
                 String originalFilename = file.getOriginalFilename();
                 String dirPath = request.getServletContext().getRealPath("/upload/");
                 File filePath = new File(dirPath);
                 if (!filePath.exists()) {
                     filePath.mkdirs();
                 }
 
                 String newFilename = name +"_" + originalFilename;
                 try {
                     file.transferTo(new File(dirPath + "_"+newFilename));
                 } catch (Exception e) {
                     e.printStackTrace();
                     return "error";
                 }
             }
             return "success";
         } else {
            return "error";
         }
     }
     @RequestMapping("/download.action")
     public ResponseEntity<byte[]> filedownload(HttpServletRequest request,String filename) throws Exception{
         String path = request.getServletContext().getRealPath("/upload");
         File file = new File(path+File.separator+filename);
         filename = this.getFilename(request,filename);
         HttpHeaders headers = new HttpHeaders();
        headers.setContentDispositionFormData("attachment",filename);
         headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
         return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
     }
     public String getFilename(HttpServletRequest request,String filename) throws Exception{
         String[] IEBrowserKeyWord = {"MSIE","Trident","Edge"};
        String userAgent = request.getHeader("User-Agent");
         for(String keyWord:IEBrowserKeyWord){
             if(userAgent.contains(keyWord)){
                 return URLEncoder.encode(filename,"UTF-8");
             }
         }
        return new String(filename.getBytes("UTF-8"),"ISO-8859-1");
    }
}

使用SMM框架开发企业级应用-----mvc文件上传和下载

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