如题，本篇我们介绍下springmvc文件上传、下载。

一、文件上传

application.properties

#multipart upload 文件上传
#限制一次上传的单个文件的大小
spring.http.multipart.maxFileSize=10Mb
#限制一次上传的所有文件的总大小
spring.http.multipart.maxRequestSize=10Mb

upload.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>
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My JSP 'upload.jsp' starting page</title>
    <meta charset="utf-8"/>
  </head>
  <body>
   <form action="${pageContext.request.contextPath }/file_upload" method="post"
     enctype="multipart/form-data" target="_blank">
    fileType:<input type="text" name="fileType" id="fileType" /> <br/>
    file:<input type="file" name="file" id="file">
    <button type="submit">提交上传</button>
   </form>
    
  </body>
</html>

FileController.java

package com.tingcream.springWeb.controller;
 
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.util.Map;
import java.util.UUID;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
 
import com.tingcream.springWeb.util.AjaxUtil;
 
@Controller
public class FileController {
 
    /**
     *  文件上传
     * @param fileType 文件类型
     * @return
     */
    @ResponseBody
    @RequestMapping("/file_upload")
    public Object  file_upload(String fileType,HttpServletRequest request,HttpServletResponse response){
         
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request;
        Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();
 
        MultipartFile mulFile =  fileMap.get("file");
        if(mulFile == null  ||mulFile.getSize()<=0 ){ // -1
            return AjaxUtil.messageMap(400, "抱歉,上传文件不能为空");
        }
         
        String orgFileName= mulFile.getOriginalFilename();
        long fileSize =mulFile.getSize();
        String name = mulFile.getName();//file input域的参数名  , file
        System.out.println("文件参数名:"+name);
        System.out.println("原始文件名:"+orgFileName);
        System.out.println("文件大小:"+fileSize);
         
        System.out.println("fileType(业务参数):"+fileType);
         
        String suffix=orgFileName.substring(orgFileName.lastIndexOf("."));//文件后缀
         
        String newFileName = UUID.randomUUID().toString().replaceAll("-", "").toUpperCase()+suffix;
         
        String destPath="f:/13/"+newFileName;
      
         try {
            mulFile.transferTo(new File(destPath) );
            return  AjaxUtil.messageMap(200, "上传文件成功","destPath",destPath);
        }  catch (Exception e) {
            e.printStackTrace();
        }
         return AjaxUtil.messageMap(400, "抱歉,文件上传失败");
         
    }
     
    /**
     * 文件下载
     * @throws Exception
     */
    @ResponseBody
    @RequestMapping("/file_download")
    public  void  file_download(HttpServletRequest request,HttpServletResponse response) throws Exception{
         
        //String filePath ="f:/13/postman-4.1.2.rar";//ok
        String filePath ="f:/13/postman-安装包.rar";//中文名称文件 ok
        File file =new File(filePath);
         
        //response.setContentType("");
        response.setHeader("Content-Disposition","filename=" + new String(file.getName().getBytes("gb2312"), "iso8859-1"));
          
        BufferedInputStream bufin=new BufferedInputStream(new FileInputStream(file));
        int len=0;
        byte[]  buf=new byte[1024*4];
        while( (len=bufin.read(buf))>0){
            response.getOutputStream().write(buf, 0, len);
        }
        bufin.close();
         
    }
     
}

AjaxUtil.java

package com.tingcream.springWeb.util;
 
import java.util.HashMap;
import java.util.Map;
 
 
public class AjaxUtil {
      //得到一个map
       public static Map<String,Object> getMap(){
         return new HashMap<String,Object>();
       }
        
       //返回json数据 状态
       public static Map<String,Object> messageMap(int status){
            Map<String,Object>  map=new HashMap<String,Object>();
            map.put("status", status);
                return map;
            }
       //返回json数据 状态、消息
        public static Map<String,Object> messageMap(int status,String message){
            Map<String,Object>  map=new HashMap<String,Object>();
            map.put("status", status);
            map.put("message", message);
            return map;
        }
        //返回json数据 状态、消息 和一个参数
        public  static Map<String,Object> messageMap(int status,String message,
                String paramName,Object paramValue){
            Map<String,Object>  map=new HashMap<String,Object>();
            map.put("status", status);
            map.put("message", message);
            map.put(paramName, paramValue);
            return map;
        }
        //返回json数据 状态、消息 和多个参数
        public static Map<String,Object> messageMap(int status,String message,
                String[] paramNames,Object[] paramValues){
            Map<String,Object>  map=new HashMap<String,Object>();
            map.put("status", status);
            map.put("message", message);
            if(paramNames!=null&&paramNames.length>0){
                for(int i=0;i<paramNames.length;i++){
                    map.put(paramNames[i], paramValues[i]);
                }
            }
            return map;
        }
}

二、文件下载

download.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>
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My JSP 'download.jsp' starting page</title>
    <meta charset="utf-8"/>
  </head>
  <body>
  
     <a  href="${pageContext.request.contextPath }/file_download">下载文件</a>
    
  </body>
</html>

FileController.java 同上(文件上传中的) 。

ok！！！

springboot(八)--springmvc文件上传、下载

一、文件上传

二、文件下载

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