Spring+SpringMvc+Mybatis+多个文件上传,显示与下载

水深无声 2022-04-22 15:20 116阅读 0赞

# [Spring+SpringMvc+Mybatis+多个文件上传与下载][Spring_SpringMvc_Mybatis] #

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：

整个项目目录如图：

![1321844-20180125111901303-327572004.png][]

在数据库中新建表，表结构如下：

![1321844-20180125112045725-1722140295.png][]

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/

![1321844-20180125115932803-1967148565.png][]

上传两个文件：

![1321844-20180125120314459-504432686.png][]

![1321844-20180125120345694-425350991.png][]

点击文件名下载：

![1321844-20180125120500928-1183460231.png][]

[Spring_SpringMvc_Mybatis]: https://www.cnblogs.com/zivzhu/p/8350634.html
[1321844-20180125111901303-327572004.png]: /images/20220327/dc43525d360e4744af4ba3737cb87313.png
[1321844-20180125112045725-1722140295.png]: /images/20220327/aef2c96d42ad4897bcbeffe382148f9b.png
[1321844-20180125115932803-1967148565.png]: /images/20220327/ff09493bc2bd440c9c7bff2fd6f2c5d7.png
[1321844-20180125120314459-504432686.png]: /images/20220327/cb146b5ec9ae45eab0597b5564b76337.png
[1321844-20180125120345694-425350991.png]: /images/20220327/efbb5be601d64670a1d8e603635bcb2b.png
[1321844-20180125120500928-1183460231.png]: /images/20220327/32c1775cd69f4936989ccbc576aa1f58.png