submitservlet.java

这是本人最初练习ajax时的小程序,是用ＪＳＰ写的

package com.chinasoft.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.ArrayList;
import java.util.*;

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

/**
 * Servlet implementation class for Servlet: SubmitServlet
 *
 */
 public class SubmitServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
	 private Connection conn=null;
	 private final static String querymenu="select name from ajaxtable1 where parentid=?";
	 protected void getConn(){
	 	try {
	 		this.conn=DataSourceFactory.getDataSource().getConnection();
	 	} catch (SQLException e) {
	 		// TODO Auto-generated catch block
	 		e.printStackTrace();
	 	}
	 }
	 protected void freeConn(){
	 	try {
	 		this.conn.close();
	 	} catch (SQLException e) {
	 		// TODO Auto-generated catch block
	 		e.printStackTrace();
	 	}
	 }
	 
    /* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#HttpServlet()
	 */
	public SubmitServlet() {
		super();
	}   	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		try {
			Process(request,response);
		} catch (ServletException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}// TODO Auto-generated method stub
	}  	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		try {
			Process(request,response);
		} catch (ServletException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}// TODO Auto-generated method stub
	}
	protected void Process(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException, SQLException{
		int sid=Integer.parseInt(request.getParameter("id"));
		try{
		getConn();
		PreparedStatement psmt=conn.prepareStatement(querymenu);
		psmt.setInt(1,sid);
		List menulist=new ArrayList();
		ResultSet rs=psmt.executeQuery();
		PrintWriter out=response.getWriter();
		response.setContentType("text/HTML");
		while(rs.next()){
			AjaxDTO dto=new AjaxDTO();
			dto.setName(rs.getString("name"));
			menulist.add(dto);
		}
		
		Iterator it=menulist.iterator();
		out.println("[");
		while(it.hasNext()){
			AjaxDTO ajaxdto=new AjaxDTO();
			ajaxdto=(AjaxDTO)it.next();
			out.println("\""+ajaxdto.getName()+"\"");
			out.println(",");
		}
		out.println("0]");
}catch(SQLException e){
	e.printStackTrace();	
		}finally{
			freeConn();
		}
	}
}