一.思路

　　在檔案上傳的基礎上引入陣列可以實現批量上傳,只需要更改一下前段頁面和controller類即可

　　檔案上傳: https://www.cnblogs.com/aihuadung/p/10167507.html

二.實現

　　在檔案上傳的基礎上更改fileupload.jsp

    <form action="batchupload.do" method="post" enctype="multipart/form-data">
        檔案上傳:<input type="file" name="file" value="選擇檔案"/><br/>
        檔案上傳:
 
<input type="file" name="file" value="選擇檔案"/><br/>
        <input type="submit" value="submit"/>
    </form>

　　建立HelloController類

package com.ahd.controller;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
 
import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
 
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

@Controller
public class HelloController5{
    @RequestMapping("/batchupload")
    public String upload(@RequestParam("file")CommonsMultipartFile []files,HttpServletRequest req,ModelMap mm) throws IOException{
        //獲取上傳路徑
        String path=req.getRealPath("upload");
        
        InputStream is=null;
        OutputStream os=null;
        
        for(CommonsMultipartFile file:files){
            //獲取檔名稱
            String filename=file.getOriginalFilename();
            
            is = file.getInputStream();
            os = new FileOutputStream(new File(path,filename));
            
            byte[]b=new byte[1024];
            int len=0;
            
            while((len=is.read(b))!=-1){
                os.write(b, 0, len);
            }
        }
        
        is.close();
        os.close();
        
        mm.addAttribute("msg", "檔案上傳成功");
        return "success";
    }
}