java实现动态上传多个文件并解决文件重名问题

本文分为两大方面进行讲解：

一、java实现动态上传多个文件

二、解决文件重命名问题java

供大家参考，具体内容如下

1、动态上传多个文件

遍历所有要上传的文件

2、解决文件的重名的问题

package cn.hx.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FileUtils;

public class UpImgServlet extends HttpServlet {

  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    String path = getServletContext().getRealPath("/up");
    DiskFileItemFactory disk = 
 new DiskFileItemFactory(1024*10,new File("d:/a"));
    ServletFileUpload up = new ServletFileUpload(disk);
    try{
      List list = up.parseRequest(request);
      //只接收图片*.jpg-iamge/jpege.,bmp/imge/bmp,png,
      List imgs = new ArrayList();
      for(FileItem file :list){
 if(file.getContentType().contains("image/")){
   String fileName = file.getName();
   fileName = fileName.substring(fileName.lastIndexOf("\")+1);
   
   //获取扩展
   String extName = fileName.substring(fileName.lastIndexOf("."));//.jpg
   //UUID
   String uuid = UUID.randomUUID().toString().replace("-", "");
   //新名称
   String newName = uuid+extName;     //在这里用UUID来生成新的文件夹名字，这样就不会导致重名
   
   
   FileUtils.copyInputStreamToFile(file.getInputStream(),
new File(path+"/"+newName));
   //放到list
   imgs.add(newName);
 }
 file.delete();
      }
      request.setAttribute("imgs",imgs);
      request.getRequestDispatcher("/jsps/imgs.jsp").forward(request, response);
    }catch(Exception e){
      e.printStackTrace();
    }
  
  }

}

以上实现了java多文件上传，解决了文件重名问题，希望对大家的学习有所帮助。