testregistername.java

用最近的dojo1.2.1制作前端的ajax购书网站

package server.servlet;

import java.io.*;
import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;
import server.database.*;
import java.sql.*;
/**
 * @version 	1.0
 * @author
 */
public class TestRegisterName extends HttpServlet {

	public void doGet(HttpServletRequest req, HttpServletResponse resp)
		throws ServletException, IOException {
			resp.setHeader("Cache-Control","no-cache");
			//resp.setContentType("text/html;charset='UTF-8'");//数据传送类型是text,字符集是UTF-8
			String Name = req.getParameter("consumer_register_name");
			//System.out.print(Name);
			Operation op = new Operation();
			String sql = "SELECT name FROM Consumer where name = \'"+ Name+"\'";
			boolean wExist = true;
			String str = null;
			PrintWriter out=resp.getWriter();
			try{
				ResultSet rs = op.select(sql);
				if(rs.next()){
					wExist = false;
				}
				else{
					wExist = true;
				}
				rs.close();
				op.closeConnection();
				//rs.next();
				//System.out.print(wExist);
			}
			catch(ClassNotFoundException e){System.out.print(e);}
			catch(SQLException e){System.out.print(e);}
			catch(InstantiationException e){System.out.print(e);}
			catch(IllegalAccessException e){System.out.print(e);}
			if(wExist == true){
				str = "true";
			}
			else{
				str = "false";
			}
			System.out.print(str);
			out.print(str.toString());
	}

	/**
	* @see javax.servlet.http.HttpServlet#void (javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
	*/
	public void doPost(HttpServletRequest req, HttpServletResponse resp)
		throws ServletException, IOException {
			doGet(req,resp);

	}

	/**
	* @see javax.servlet.GenericServlet#void ()
	*/
	public void init() throws ServletException {

		super.init();

	}

}