SSM文件上传下载管理

1单文件管理

1_1单文件上传

https://www.cnblogs.com/zfding/p/8338429.html

项目结构

jar包

    
    
      commons-fileupload
      commons-fileupload
      1.3.1
    

    
      commons-io
      commons-io
      2.4
    

然后按照上面的结构图，在web底下创建一个文夹upload用来存储上传文件

然后在写一个FileUL类

package com.bdqn.controller;

import org.apache.commons.io.FileUtils;
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.commons.CommonsMultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.InputStream;

/*
文件上传下载类
 */
@Controller
public class FileUL {
    /**
     * 单个文件上传
     * @param request
     * @return
     */
    @RequestMapping(value="/upload2",produces="text/html;charset=utf-8")
    @ResponseBody
    private String upload2(@RequestParam("file")CommonsMultipartFile partFile, HttpServletRequest request) {
        try {
            //读取文底下存储文件夹的路径
            String path = request.getServletContext().getRealPath("/upload");
            //读取前端的自定义文件名
            String name = request.getParameter("name");
            //读取上传文件的文件名
            String filename = partFile.getOriginalFilename();
            //拼接路径
            File file = new File(path+"/"+filename);
            //用IO流把文件写入到该文件夹下
            InputStream inputStream = partFile.getInputStream();
            FileUtils.copyInputStreamToFile(inputStream, file);

            if(inputStream!=null){
                inputStream.close();
            }
            return "文件上传成功！";
        } catch (Exception e) {
            e.printStackTrace();
            return "文件上传失败！";
        }
    }

    //无关紧要
    @RequestMapping("/index.html")
    public String index(){
        return "index";
    }

}

然后前端页面index.jsp（表单提交和AJAX提交）

<%--
  Created by IntelliJ IDEA.
  User: Admin
  Date: 2018/9/19
  Time: 10:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>


    



<%----%>
    <%----%>
        <%----%>
        <%----%>
        <%----%>
    <%----%>
    <%----%>
        <%----%>
            <%----%>
            <%----%>
            <%----%>
        <%----%>
    <%----%>
<%--
ID
name
price
${li.id}
${li.name}
${li.price}
--%>


    
    
    
    

1_2单文件下载

    /*单文件下载*/
    /**
     * 文件下载
     * 单个文件下载
     * @param request
     * @return
     * @throws IOException
     */
    @RequestMapping("/down1")
    private void down(HttpServletRequest request,HttpServletResponse response) throws IOException {
        String path = request.getServletContext().getRealPath("/upload");
        File file = new File(path);
        File[] files = file.listFiles();
        String name = files[0].getName();//随机获取一个文件，实际中按需编写代码
        System.out.println("文件的名字："+name);
        response.addHeader("content-disposition", "attachment;filename="+name);
        FileUtils.copyFile(files[0], response.getOutputStream());
    }

<%--下载--%>

     

2多文件

1_1多文件上传

<%--
  Created by IntelliJ IDEA.
  User: Admin
  Date: 2018/9/19
  Time: 10:47
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>


    



<%----%>
    <%----%>
        <%----%>
        <%----%>
        <%----%>
    <%----%>
    <%----%>
        <%----%>
            <%----%>
            <%----%>
            <%----%>
        <%----%>
    <%----%>
<%--
ID
name
price
${li.id}
${li.name}
${li.price}
--%>

<%--单文件上传--%>

    
    
    
    


<%--单文件下载--%>

     


<%--多文件--%>

    
    
    
    
    
    


<%--多文件下载--%>

    

package com.bdqn.controller;

import org.apache.commons.io.FileUtils;
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.commons.CommonsMultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/*
文件上传下载类
 */
@Controller
public class FileUL {
    /**
     * 单个文件上传
     * @param request
     * @return
     */
    @RequestMapping(value="/upload2",produces="text/html;charset=utf-8")
    @ResponseBody
    private String upload2(@RequestParam("file")CommonsMultipartFile partFile, HttpServletRequest request) {
        try {
            //读取文底下存储文件夹的路径
            String path = request.getServletContext().getRealPath("/upload");
            //读取前端的自定义文件名
            String name = request.getParameter("name");
            //读取上传文件的文件名
            String filename = partFile.getOriginalFilename();
            //拼接路径
            File file = new File(path+"/"+filename);
            //用IO流把文件写入到该文件夹下
            InputStream inputStream = partFile.getInputStream();
            FileUtils.copyInputStreamToFile(inputStream, file);

            if(inputStream!=null){
                inputStream.close();
            }
            return "文件上传成功！";
        } catch (Exception e) {
            e.printStackTrace();
            return "文件上传失败！";
        }
    }

    /*单文件下载*/
    /**
     * 文件下载
     * 单个文件下载
     * @param request
     * @return
     * @throws IOException
     */
    @RequestMapping("/down1")
    private void down(HttpServletRequest request,HttpServletResponse response) throws IOException {
        String path = request.getServletContext().getRealPath("/upload");
        File file = new File(path);
        File[] files = file.listFiles();
        String name = files[0].getName();//随机获取一个文件，实际中按需编写代码
        System.out.println("文件的名字："+name);
        response.addHeader("content-disposition", "attachment;filename="+name);
        FileUtils.copyFile(files[0], response.getOutputStream());
    }


    /*多文件*/
    /**
     * 多个文件上载
     * @param request
     * @return
     */
    @RequestMapping(value="/upload3",produces="text/html;charset=utf-8")
    @ResponseBody
    private String upload3(@RequestParam("file")CommonsMultipartFile[] partFiles,HttpServletRequest request) {
        InputStream inputStream = null;
        try {
            String path = request.getServletContext().getRealPath("/upload");
            String name = request.getParameter("name");
            for (int i = 0; i < partFiles.length; i++) {
                String filename = partFiles[i].getOriginalFilename();
                File file = new File(path+"/"+filename);
                inputStream = partFiles[i].getInputStream();
                FileUtils.copyInputStreamToFile(inputStream, file);
            }
            if(inputStream!=null){
                inputStream.close();
            }
            return "文件上传成功！";
        } catch (Exception e) {
            e.printStackTrace();
            return "文件上传失败！";
        }
    }

    /*多文件下载*/
    /**
     * 文件下载，一下次下载多个文件
     * 思路：先将多个文件压缩到一个压缩包里去，然后传到前台
     * @param request
     * @return
     * @throws IOException
     */
    @RequestMapping("/down2")
    private void down2(HttpServletRequest request,HttpServletResponse response) throws IOException {
        String path = request.getServletContext().getRealPath("/upload");
        File file = new File(path);
        File[] files = file.listFiles();
        File zipFile =new File("test.zip");
        if(!zipFile.exists()){
            zipFile.createNewFile();
        }
        String zipName = zipFile.getName();
        response.addHeader("Content-Disposition", "attachment;filename="+zipName);
        //定义输出类型
//        response.setContentType("application/zip");
        ZipOutputStream zip = new ZipOutputStream(new FileOutputStream(zipFile));
        BufferedInputStream in  =null;
        for(int i = 0;i