servlet3.0 文件上传功能

注意 jsp页面中file选择 的要有属性 name='file'

package com.webserver.webservice;



import java.io.File;

import java.io.IOException;

import java.util.List;



import javax.servlet.ServletConfig;

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 org.apache.catalina.core.ApplicationPart;



/**

 * Servlet implementation class UpLoadServlet

 * author:chuanyuBai 2014/07/21

 */

@MultipartConfig(location = "D:/upload", fileSizeThreshold = 1024)

public class PCMUploadServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    

       

    /**

     * @see HttpServlet#HttpServlet()

     */

    public PCMUploadServlet() {

        super();

    }



    @Override

    public void init(ServletConfig config) throws ServletException {

        super.init(config);

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    

    }



    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    

        request.setCharacterEncoding("utf-8");

        try{

            //获取多文件

            List<Part> partlist =  (List<Part>) request.getParts();

            //获取单文件文件部件part

            Part part = request.getPart("file");

            //获取文件名称的两种方式

            //方式一

            String filename1 = ((ApplicationPart)part).getFilename();

            //方式二

            //获取文件服务器头部信息

            String h = part.getHeader("content-disposition");

            String filename = h.substring(h.lastIndexOf("=") + 2, h.length() - 1);

            String root = request.getServletContext().getRealPath("/upload");

            File f=new File(root);  

            f.mkdir();  

            //删除生成的中间文件

            part.delete();

            part.write(root+"/"+filename);

        }catch(Exception e){

            System.out.println(e.getMessage());

        }

    

    }

    



}