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这是NameExistCheck.java。。

package client;

import java.io.*;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* Servlet implementation class NameExistCheck

*/

@WebServlet("/NameExistCheck")

public class NameExistCheck extends HttpServlet {

private static final long serialVersionUID = 1L;

public NameExistCheck() {

super();

// TODO Auto-generated constructor stub

}

/**

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

*/

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

this.doPost(request, response);

}

/**

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

*/

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

request.setCharacterEncoding("utf8");

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

PrintWriter pw = response.getWriter();

String name = request.getParameter("name");

try {

Class.forName("com.mysql.jdbc.Driver").newInstance();

} catch (Exception e ) {

e.printStackTrace();

}

try {

conn =DriverManager.getConnection("jdbc:mysql://localhost/mystore?"+"user=root&password=jim1");

String sql = "select id from clientbasic where name = ?";

pstmt = conn.prepareStatement(sql);

pstmt.setString(1,name);

rs = pstmt.executeQuery();

if(rs.next()){

pw.print("true");

} else {

pw.print("false");

}

} catch (SQLException e) {

e.printStackTrace();

}

finally{

try{

rs.close();

pstmt.close();

conn.close();

} catch(Exception e) {

e.printStackTrace();

}

}

}

}