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.*;

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;
	 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{
		try{
		PrintWriter out=response.getWriter();
		response.setContentType("text/HTML");
		getConn();
		Statement stmt=conn.createStatement();
//		PreparedStatement psmt=conn.prepareStatement(query_string);
		String searchvalue=request.getParameter("key");
		String query_string="select name from ajaxtable3 where name like '"+searchvalue+"%'";
		ResultSet rs=stmt.executeQuery(query_string);
//		psmt.setString(1,searchvalue);
		List list=new ArrayList();
//		ResultSet rs=psmt.executeQuery();
		while(rs.next()){
			AjaxDTO ajaxdto=new AjaxDTO();
			ajaxdto.setName(rs.getString("name"));
			list.add(ajaxdto);
		}
		StringBuffer bs=new StringBuffer();
		Iterator it=list.iterator();
		while(it.hasNext()){
			AjaxDTO ajaxdto=new AjaxDTO();
			ajaxdto=(AjaxDTO)it.next();
			bs.append(ajaxdto.getName()+"\n");
		}
//		for(int i=0;i<list.size();i++){
//			String key=(String)list.get(i);
//			bs.append(key+"\n");
//		}
		out.print(bs.toString());
		}catch(SQLException e){
			e.printStackTrace();
		}finally{
			freeConn();
		}
	}
}