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：

                 
      
       commons-fileupload
                  
      
       commons-fileupload
                  
      
       1.3.3
              
     

在spring配置文件中加入文件配置：

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;@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 + "]";    }        }

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
     
       selectAllFile();    }
     

UpFileMapper.xml：

       
         
              
               
               
           
              
              select * from upfile where id=#{id}        
      
           insert into upfile (filename,filepath) values (#{filename},#{filepath})    
              
              select * from upfile    
     

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
     
       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;@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
     
       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")@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
     
       allfiles=fileService.selectAllFile();        //新建map存储文件id和name,其中id作为键        HashMap
      
        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
       
         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"%>
     
     
    
      
          
          
      
     

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" %>
         
         
     
     
          
       
            
${file.key}
            
    
             
          
 
           
${filename}
 
          
    
             
           
                  
     

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：

结束！