今天做了一个PHPRPC的JAVA例程

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今天做了一个PHPRPC的JAVA小例程,实现用户名的检测:很高兴,所以与大家分享,希望大家多多写java 的
客户端(server_user.jsp):

因为上传不了图片,就将就了.
<html>
<TITLE> Sign users </TITLE>
<head>
<script type="text/javascript" src="phprpc_client.js"></script>
</head>
<body>

<div align="center">
帐号：<input type="text" id="username" />
密码：<input type="password" id="password" />
<input type="button" value="登录" id="loginbtn" />
</div>
<div id="feedback">

</div>
    <script type="text/javascript">

        var username = document.getElementById('username').value;
        var password = document.getElementById('password').value;

        var feedback = document.getElementById('feedback');

        var rpc_client = new PHPRPC_Client('http://localhost:8080/phprpc/signuser/server_user.jsp', ['validate']);
       document.getElementById("loginbtn").onclick= function() {
       feedback.innerHTML = "waiting...";
        rpc_client.validate(username, function (result) {
          feedback.innerHTML= result;
       });
       }
    </script>

</body>
</html>

服务器端(server.jsp):

    <%@ page import="org.phprpc.*" %>
    <%@ page import="classmate.*" %>
    <%
    PHPRPC_Server phprpc_server = new PHPRPC_Server();

    SignUpAction sign=new SignUpAction();
    phprpc_server.add("validate", sign);
    phprpc_server.start(request, response);
    %>

类方法 (两个:SignUpAction.java,DB.java):

package classmate;

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

public class SignUpAction {
    public String validate(String uname){

        String result="";
        //创建输出流对象
        //数据库操作
        DB db = new DB();
        ResultSet rs;
         int insRes = 0;
        String strSql=null;
        //判断用户名是否重复
        strSql = "select * from users where Uname='" + uname + "'";
        rs = db.executeQuery(strSql);
      try{

           if (!rs.next()) {

             result="user is ok";

            } else{

               result="user is occpied";
            }
        }


        catch(SQLException e){
         e.printStackTrace();
         }

      return result;
    }
}