用servlet 3.0 版本也可以用 request.getParts 来获取多文件文件上传（用它上传@MultipartConfig标注）

js 页面多文件上传

<%@ 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="Upload" method="post" enctype="multipart/form-data">
       <input type="text" name="name"><br>
       <input type="file" name="file" multiple="multiple"> <br>
       <input type="text" name="password"><br>
       <input type="submit" value="上传"><br>
   </form>
</body>
</html>

java 类

package d2003;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

import cn.day1201.utils.CommonUtils;

@MultipartConfig(maxFileSize = 224800, maxRequestSize = 1843200) // 指定文件保存的路径
public class Upload extends HttpServlet {
   private static final long serialVersionUID = 1L;

   public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       request.setCharacterEncoding("utf-8");
       response.setContentType("text/html;charset=utf-8");

       Collection<Part> parts = request.getParts();

       for (Part part : parts) {

           if (part.getContentType() != null) {
               System.out.println("---" + part.getContentType());
               System.out.println(part);
               String originalName = getFileName(part);
               System.out.println(originalName);
               int hcode = originalName.hashCode();
               String hex = Integer.toHexString(hcode); // 得到16进制
               String root = getServletContext().getRealPath("/upload");
               File dirFile = new File(root, hex.charAt(0) + "/" + hex.charAt(1));
               dirFile.mkdirs();
               String newName = CommonUtils.unid() + ".jpg";// 新的文件名
               part.write(dirFile + "/" + newName);// 把上传的文件写到指定的位置，参数是文件保存文件名

               PrintWriter out = response.getWriter();
               out.print("upload 成功（success）");
               System.out.println("upload success");// 控制台打印信息
           }

       }

       //单文件上传
//       Part part = request.getPart("file");//上传文件对象的描述
//       String newName = CommonUtils.unid()+".jpg";//新的文件名 //保存目录
//       String originalName =   getFileName(part);
//       System.out.println(originalName);
//       int hcode = originalName.hashCode();
//       String hex = Integer.toHexString(hcode); //得到16进制
//       String root = getServletContext().getRealPath("/upload");
//       File dirFile = new File(root,hex.charAt(0)+"/"+hex.charAt(1)); dirFile.mkdirs();
//       part.write(dirFile+"/"+newName);//把上传的文件写到指定的位置，参数是文件保存文件名
//       PrintWriter out = response.getWriter(); out.print("upload 成功（success）");
//       System.out.println("upload success");//控制台打印信息


       String name = request.getParameter("name");
       String password = request.getParameter("password");
       System.out.println(name + "---" + password);
   }

   // 获取文件的名称
   private String getFileName(Part part) {
       String contentDisposition = part.getHeader("content-disposition");
       String[] elements = contentDisposition.split(";");
       for (String element : elements) {
           if (element.trim().startsWith("filename")) {
               return element.substring(element.indexOf('=') + 1).trim().replace("\"", "");
           }
       }
       return null;
   }

}

有不了解的可以加我QQ 156356969

用servlet 3.0 版本也可以用 request.getParts 来获取多文件文件上传 （用它上传@MultipartConfig标注 ）

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用servlet 3.0 版本也可以用 request.getParts 来获取多文件文件上传（用它上传@MultipartConfig标注）