springMVC实现文件上传下载

（1）springMvc.xml

<bean id="multipartResolver"
       class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
       
       <property name="maxUploadSize" value="10485760" />
   </bean>

(二) controller层编写

package com.sf.QLAHP.controller;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.disk.DiskFileItem;
import org.apache.commons.io.FilenameUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
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.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

import com.sf.QLAHP.domain.AppVersionDo;
import com.sf.QLAHP.service.AppVersionService;
import com.sf.QLAHP.util.MD5Util;
import com.sf.erui.common.response.Response;
import com.sf.erui.common.response.ResponseHelper;

**************************************************************************************

   /*
     * 采用file.Transto 来保存上传的文件
     */
    @RequestMapping("fileUpload")
    @ResponseBody
    public Response fileUpload(@RequestParam("file") MultipartFile file ,AppVersionDo appVersion ,HttpServletRequest request) throws IOException {
       //判断如果上传文件为空，直接返回
       if(file.isEmpty()) {
           return ResponseHelper.buildFail(RebackMessageEnum.Upload.getFailure());
       }
       //获取项目的真实路径：D:\eclipseWorkSpace\mgmt-itsc-hb-qlahp-core\QLAHP-web\src\main\webapp
       String realPath = request.getSession().getServletContext().getRealPath("");

        String filename = file.getOriginalFilename();    //上传文件名:qldb-release.apk
       String suffix = FilenameUtils.getExtension(filename); //文件扩展名：.apk
       String newName = UUID.randomUUID().toString().replaceAll("-", "") + "." + suffix;
       String PathName = "/WEB-INF/upload/" +newName;//文件的具体位置
        String path = realPath+PathName;//存放文件的具体路径
        File newFile=new File(path);

        if(!newFile.exists()){
           newFile.mkdir();   //如果该目录不存在，就创建此抽象路径名指定的目录。
        }

        //通过CommonsMultipartFile的方法直接写文件（注意这个时候）
        file.transferTo(newFile);

        long size = file.getSize();//获取文件的字节大小，单位为byte

        String md5 = MD5Util.getMD5(newFile);

        AppVersionDo appVersionDo = new AppVersionDo();
        BeanUtils.copyProperties(appVersion, appVersionDo);
        appVersionDo.setAppMd5(md5);//0dc83e83fd539d04cd60caed4cacc3b5
        appVersionDo.setAppName(newName);//存到库里的app名称

      // /WEB-INF//upload/67c01b1b6d954338a57629dae08a0478.xlsx
        appVersionDo.setAppUrl(PathName);
        appVersionDo.setRemark(String.valueOf(size));
        int row = appVersionService.insertAppVersion(appVersionDo);

        if (0 >= row) {
           logger.error(RebackMessageEnum.Upload.getFailure());
           return ResponseHelper.buildFail(RebackMessageEnum.Upload.getFailure());
       }

        return ResponseHelper.buildOk(RebackMessageEnum.Upload.getSuccess());
    }

    @RequestMapping("/fileDownLoad.apk")
    public ResponseEntity<byte[]> fileDownLoadTest(HttpServletRequest request ) throws Exception{

      ServletContext servletContext = request.getSession().getServletContext();
      //全自动下载最新版本
      String fileName=null;

       AppVersionDo lastAppVersion = appVersionService.getLsstAppVersion();
       if(null == lastAppVersion){
           return null;
       }
       fileName = lastAppVersion.getAppName();

      String realPath = servletContext.getRealPath("/WEB-INF//upload/"+fileName);//得到文件所在位置
        InputStream in=new FileInputStream(new File(realPath));//将该文件加入到输入流之中
         byte[] body=null;
         body=new byte[in.available()];// 返回下一次对此输入流调用的方法可以不受阻塞地从此输入流读取（或跳过）的估计剩余字节数
         in.read(body);//读入到输入流里面

        fileName=new String(fileName.getBytes("gbk"),"iso8859-1");//防止中文乱码
        HttpHeaders headers=new HttpHeaders();//设置响应头
        headers.add("Content-Disposition", "attachment;filename="+fileName);
        HttpStatus statusCode = HttpStatus.OK;//设置响应吗
        ResponseEntity<byte[]> response=new ResponseEntity<byte[]>(body, headers, statusCode);
        return response;

        //public ResponseEntity（T body，
        //                       MultiValueMap < String，String > headers，
        //                       HttpStatus statusCode）
        //HttpEntity使用给定的正文，标题和状态代码创建一个新的。
        //参数：
        //body - 实体机构
        //headers - 实体头
        //statusCode - 状态码
    }

   @ApiOperation(value = "App更新接口", notes = "返回true/false")
   @RequestMapping("getLastVersion")
   @ResponseBody
   public Response getAppVersion() {

       AppVersionDo lastAppVersion = appVersionService.getLsstAppVersion();

       if(null == lastAppVersion){
           return ResponseHelper.buildFail("获取最新版本失败！");
       }

       //如果返回的版本号不是最新的，将最新的版本信息返回
       return ResponseHelper.buildOk(lastAppVersion);
   }

   @ApiOperation(value = "App删除", notes = "返回true/false")
   @RequestMapping("deleteAppVersionById")
   @ResponseBody
   public Response deleteAppVersion(@RequestBody AppVersionDo record, HttpServletRequest request) {
       if (null == record) {
           logger.debug("数据传输错误！");
           return ResponseHelper.buildFail("数据传输错误！");
       }
       if (null == record.getAppName()) {
           logger.debug("App名字不能为空！");
           return ResponseHelper.buildFail("数据传输错误！");
       }

       int sysResult = 0;
       Integer id = record.getId();//主键ID

       try {
           sysResult = appVersionService.deleteAppVersionById(id);
           if(sysResult == 1 ){
               // 删除对应的app包
               String   fileName = record.getAppName();
               ServletContext servletContext = request.getSession().getServletContext();
               String realPath = servletContext.getRealPath("/WEB-INF//upload/"+fileName);//得到文件所在位置
               File file =new File(realPath); //得到该文件的绝对路径
               file.delete();//删除文件；
           }

           if (0 >= sysResult) {
               logger.error(RebackMessageEnum.Delete.getFailure());
               return ResponseHelper.buildFail(RebackMessageEnum.Delete
                       .getFailure());
           }
       } catch (Exception e) {
           logger.error(RebackMessageEnum.Delete.getFailure(), e);
           return ResponseHelper.buildFail(RebackMessageEnum.Delete
                   .getFailure());
       }

       return ResponseHelper.buildOk(RebackMessageEnum.Delete.getSuccess());
   }

   @ApiOperation(value = "App删除-------test----------------", notes = "返回true/false")
   @RequestMapping("deleteAppVersionTest")
   @ResponseBody
   public Response deleteAppVersionTest(HttpServletRequest request) {

       int sysResult = 0;
       Integer id = 1;//主键ID

       try {
           sysResult = appVersionService.deleteAppVersionById(id);
           // 删除对应的app包
              String   fileName = "qldb-release.apk";
              ServletContext servletContext = request.getSession().getServletContext();
              String realPath = servletContext.getRealPath("/WEB-INF//upload/"+fileName);//得到文件所在位置

           File file =new File(realPath); //得到该文件的绝对路径
           file.delete();//删除文件；

return ResponseHelper.buildOk(RebackMessageEnum.Delete.getSuccess());
}

______________________________________________________________________

   // @RequestMapping("/fileDownLoad") @@@@普通文件下载
    @RequestMapping("/fileDownLoad.apk") //app端下载的名字，必须加后缀.apk
    public ResponseEntity<byte[]> fileDownLoadTest(HttpServletRequest request ) throws Exception{

      ServletContext servletContext = request.getSession().getServletContext();
      //全自动下载最新版本
      String fileName=null;

-----------------------------------------------------------------------------------------------------------------------------------------------

    @RequestMapping("fileUploadTest")
    public String fileUploadTest(HttpServletRequest request) throws IOException {
       //1、获取项目的绝对路径
       String realPath2 = request.getSession().getServletContext().getRealPath("");
       System.out.println("realPath2:\t"+realPath2);//D:\eclipseWorkSpace\mgmt-itsc-hb-qlahp-core\QLAHP-web\src\main\webapp
       //3、获取当前文件的绝对路径
       String realPath = request.getSession().getServletContext().getRealPath(request.getRequestURI());
       System.out.println("realPath=\t"+realPath);//D:\eclipseWorkSpace\mgmt-itsc-hb-qlahp-core\QLAHP-web\src\main\webapp\dispatch\fileUploadTest
        return "6666666666";
    }

springMVC实现文件上传下载

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