输入学号和姓名，当光标离开时，检测学号是否可用

来源：互联网发布：淘宝买药货到付款规则编辑：程序博客网时间：2024/04/30 09:29

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

function check(){

var stuId = document.regForm.stuId.value;

var xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");

xmlHttp.open("GET", "check.do?stuId="+stuId, true);

xmlHttp.onreadystatechange=function() {

if (xmlHttp.readyState==4) {

checkResult.innerHTML = xmlHttp.responseText;

}

else{

checkResult.innerHTML = "正在检测...";

}

xmlHttp.send();

}

</SCRIPT>

请您输入学生学号:<input type="text" name="stuId" onblur="check()">

请您输入学生姓名:<input type="text" name="stuName"><BR>

</form>

<hr>

</body>

</html>

======================================================

CheckAction .java

package prj29_1.action;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import dao.StudentDao;

public class CheckAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

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

StudentDao sdao = new StudentDao();

String stuName = sdao.getNameById(stuId);

response.setCharacterEncoding("gb2312");

PrintWriter out = null;

try{

out = response.getWriter();

}catch(Exception ex){}

if(stuName==null){

out.print("该学号没有被注册，您可以注册");

}

else{

out.print("对不起，您不能重复注册!!");

}

return null;

}