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());
        }

    }

}