ssm+多个文件上传与下载

<dependency> ???????????<groupId>commons-fileupload</groupId> ???????????<artifactId>commons-fileupload</artifactId> ???????????<version>1.3.3</version> ???????</dependency>

<bean id="multipartResolver" ???????class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> ???????<!-- 设置默认编码 --> ???????<property name="defaultEncoding" value="utf-8"></property> ???????<!-- 上传图片最大大小5M --> ???????<property name="maxUploadSize" value="5242440"></property> ???</bean>

package com.test.model;import org.springframework.stereotype.Component;@Componentpublic class UpFile { ???private int id; ???private String filename; ???private String filepath; ???????public UpFile() { ???????super(); ???} ???public UpFile(int id, String filename, String filepath) { ???????super(); ???????this.id = id; ???????this.filename = filename; ???????this.filepath = filepath; ???} ???public int getId() { ???????return id; ???} ???public void setId(int id) { ???????this.id = id; ???} ???public String getFilename() { ???????return filename; ???} ???public void setFilename(String filename) { ???????this.filename = filename; ???} ???public String getFilepath() { ???????return filepath; ???} ???public void setFilepath(String filepath) { ???????this.filepath = filepath; ???} ???@Override ???public String toString() { ???????return "UpFile [id=" + id + ", filename=" + filename + ", filepath=" + filepath + "]"; ???} ???????}

package com.test.mapper;import java.util.List;import com.test.model.UpFile;public interface UpFileMapper { ???UpFile selectFileById(int id); ???void InsertUpFile(UpFile upFile); ???List<UpFile> selectAllFile(); ???}

<?xml version="1.0" encoding="UTF-8" ?> ?<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" ?"http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.test.mapper.UpFileMapper"> ???<resultMap type="UpFile" id="UpFileBean"> ???????<id column="id" property="id" /> ???????<result column="filename" property="filename" /> ???????<result column="filepath" property="filepath" /> ???</resultMap> ???????<select id="selectFileById" resultMap="UpFileBean"> ???????select * from upfile where id=#{id} ???</select> ???<insert id="InsertUpFile" parameterType="UpFile"> ???insert into upfile (filename,filepath) values (#{filename},#{filepath}) ???</insert> ???????<select id="selectAllFile" resultType="UpFile"> ???????select * from upfile ???</select></mapper>

package com.test.service;import java.util.List;import com.test.model.UpFile;public interface FileService { ???UpFile selectFileById(int id); ???void InsertUpFile(UpFile upFile); ???List<UpFile> selectAllFile();}

package com.test.service;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.test.mapper.UpFileMapper;import com.test.model.UpFile;@Servicepublic class FileServiceImpl implements FileService{ ???@Autowired ???UpFileMapper upFileMapper; ???@Override ???public UpFile selectFileById(int id) { ???????// TODO Auto-generated method stub ???????return upFileMapper.selectFileById(id); ???} ???@Override ???public void InsertUpFile(UpFile upFile) { ???????// TODO Auto-generated method stub ???????upFileMapper.InsertUpFile(upFile); ???} ???@Override ???public List<UpFile> selectAllFile() { ???????// TODO Auto-generated method stub ???????return upFileMapper.selectAllFile(); ???}}

package com.test.controller;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;import com.test.model.UpFile;import com.test.service.FileService;@RequestMapping("/file")@Controllerpublic class FileController { ???@Autowired ???FileService fileService; ???@RequestMapping("/fileup") ???//参数中的files要和页面中input输入框的name值相同 ???public String fileup(MultipartFile[] files, HttpServletRequest request) throws IllegalStateException, IOException { ???????//获取文件上传路径 ???????String path = request.getSession().getServletContext().getRealPath("upload"); ???????System.out.println(path); ???????StringBuffer stringBuffer=new StringBuffer(); ???????for (MultipartFile multipartFile : files) { ???????????????if(!multipartFile.isEmpty()) { ???????????????//将多个文件名拼接在一个字符串中，用;分隔 ???????????????stringBuffer.append(multipartFile.getOriginalFilename()); ???????????????stringBuffer.append(";"); ???????????????File dir=new File(path, multipartFile.getOriginalFilename()); ???????????????if(!dir.exists()) { ???????????????????dir.mkdirs(); ???????????????} ???????????????multipartFile.transferTo(dir); ???????????} ???????????????????} ???????//去除最后一个;号 ???????String s=stringBuffer.substring(0, stringBuffer.length()-1); ???????//存入数据库 ???????fileService.InsertUpFile(new UpFile(0, s, path)); ???????System.out.println(s); ???????//重定向至显示页面 ???????return "redirect:/file/showallfiles"; ???} ???@RequestMapping("/showallfiles") ???public String showAllFile(Model model) { ???????//获取所有文件 ???????List<UpFile> allfiles=fileService.selectAllFile(); ???????//新建map存储文件id和name,其中id作为键 ???????HashMap<String, Object> map=new HashMap<>(); ???????for (UpFile upFile : allfiles) { ???????????//分割文件名字符串，将每个文件名添加到list中， ???????????List<String> filenamelist=new ArrayList<>(); ???????????String[] filenamearr=upFile.getFilename().split(";"); ???????????for (String string : filenamearr) { ???????????????filenamelist.add(string); ???????????} ???????????//list作为map的值 ???????????map.put(upFile.getId()+"", filenamelist); ???????} ???????model.addAttribute("files", map); ???????return "showfile"; ???} ???@ResponseBody ???@RequestMapping("/downfile") ???public String downfile(String filename,String id,HttpServletRequest request,HttpServletResponse response) throws IOException { ???????System.out.println(filename+id); ???????//根据id获取文件上传路径 ???????UpFile upFile=fileService.selectFileById(Integer.parseInt(id)); ???????String fileName = upFile.getFilepath()+"/"+filename; ???????//防止中文乱码 ???????filename = URLEncoder.encode(filename,"UTF-8"); ?????????System.out.println(filename); ???????//获取输入流 ?????????InputStream bis = new BufferedInputStream(new FileInputStream(new File(fileName))); ??????//设置文件下载头 ?????????response.addHeader("Content-Disposition", "attachment;fileName=" + filename); ???????????//1.设置文件ContentType类型，这样设置，会自动判断下载文件类型 ???????????response.setContentType("multipart/form-data"); ??????????BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream()); ?????????int len = 0; ?????????while((len = bis.read()) != -1){ ?????????????out.write(len); ?????????????out.flush(); ?????????} ?????????out.close(); ?????????return "OK"; ???}}

<%@ page language="java" contentType="text/html; charset=utf-8" ???pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Insert title here</title></head><body><form action="file/fileup" method="post" enctype="multipart/form-data"> ???<input type="file" name="files" value="文件一"/><input type="file" name="files" value="文件二"/> ???<input type="file" name="files" value="文件三"/> ???<input type="submit" value="上传"/></form></body></html>

<%@ page language="java" contentType="text/html; charset=utf-8" ???pageEncoding="utf-8"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Insert title here</title></head><body> ???<table> ???<c:forEach items="${files }" var="file"> ???<tr> ???<td>${file.key}</td> ???<td> ???<c:forEach items="${file.value}" var="filename"> ???<ul> ???<li><a href="/ssm/file/downfile?filename=${filename}&id=${file.key}">${filename}</a></li> ???</ul> ???</c:forEach> ???</td> ???</tr> ???</c:forEach> ???????</table></body></html>