Spring+SpringMvc+Mybatis+多个文件上传与下载

关于ssm整合请看我的第一篇，这里只讲文件上传与下载

首先加入相关依赖：

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

在spring配置文件中加入文件配置：

<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>

整个项目目录如图：

在数据库中新建表，表结构如下：

Upfile.java:

package com.test.model;

import org.springframework.stereotype.Component;

@Component
public 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 + "]";
    }

    
    
}

UpFileMapper.java：

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();
    
}

UpFileMapper.xml：

<?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>

FileService.java：

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();
}

FileServiceImpl.java：

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;
@Service
public 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();
    }

}

FileController.java：

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")
@Controller
public 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";
    }
}

在index.html中编写上传页面：

<%@ 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>

在/WEB-INF/views/目录下新建showfile.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>

最后，开启tomcat，输入网址：http://localhost:8080/ssm/

上传两个文件：

点击文件名下载：

Spring+SpringMvc+Mybatis+多个文件上传与下载

Spring+SpringMvc+Mybatis+多个文件上传与下载

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