最近學習了ajax的非同步呼叫和重新整理技術，就實踐了一把。也借鑒了別人的方法，再加入自己的思路，就有了下面的東東```有任何疑問，就留言吧````
首先是前台的jsp頁面
關於jquery的post方法大家可以去看看這個，寫的很詳細：http://www.itivy.com/jquery/archive/2011/7/6/jquery-get-post-getjson-ajax.html
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib uri="/struts-tags" prefix="s"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>My JSP 'register.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><script type="text/javascript" src="jquery-1.9.1.js"></script>//引進Jquery庫 <script type="text/javascript"> jQuery(function() { $("#username").blur(function() { var username= $.trim($("#username").val()); $.post("checkusername.action",{username:username},function(date,state) { if(date.result=="ok") { $("#span1").html("<font color=\"red\">使用者名稱可以使用</font>"); document.getElementById("submit").removeAttribute("disabled"); }else { $("#span1").html("<font color=\"red\">使用者名稱不可以使用</font>"); document.getElementById("submit").disabled = "true"; } //alert(date.result);警告不好看，太嚇人了 return false;},'json'); }); }); </script> </head> <body> <form action="savePerson.action" method="post" > username:<input type="text" name="username" size="20" id="username"> <span id="span1"></span> <br> password:<input type="password" name="password" size="20"><br> age: <input type="text" name="age" size="20"><br> <input type="submit" value="提交" id="submit" disabled="disabled"> </form> </body></html>
因為是使用的是struts2架構所以struts2裡面加上如下代碼：因為資料是採用接送傳輸的所以要寫成extends="json-default"
<package name="strutsjson" extends="json-default"> <action name="checkusername" class="com.liumin.action.CheckUsername" method="CheckPerson"> <result type="json"></result> </action> </package>
action裡面的代碼如下
package com.liumin.action;import java.util.List;import com.liumin.model.Person;import com.liumin.service.impl.CheckService;import com.opensymphony.xwork2.ActionSupport;public class CheckUsername extends ActionSupport{private String username;//前台傳來的資料usernamepublic String getUsername(){return username;}public void setUsername(String username){this.username = username;}private String result; public String getResult(){return result;}public void setResult(String result){this.result = result;}public String CheckPerson() throws Exception{CheckService checkService = new CheckService();String str="select * from person where username='"+username+"'" ;//組建sql語句 List<Person> list=(List<Person>)checkService.getUser(str);//取得資料 if(list.isEmpty())//安條件查詢後，判斷list是否為空白？{ this.result = "ok"; }else{ this.result = "no";} return SUCCESS;}}
service和dao層的我寫到了一塊：
package com.liumin.service.impl;import java.util.List;import org.hibernate.Session;import org.hibernate.Transaction;import com.liumin.model.Person;import com.liumin.util.HibernateUtil;public class CheckService{@SuppressWarnings("unchecked")public List<Person> getUser(String str){Session session = HibernateUtil.openSession();Transaction tx = session.beginTransaction();List<Person> list = null;try{list = session.createSQLQuery(str).addEntity(Person.class).list();//查詢資料tx.commit();}catch (Exception e){if (null != tx){tx.rollback();}}finally{HibernateUtil.close(session);}return list;}}
util裡面的資料如下：
package com.liumin.util;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtil{private static SessionFactory sessionFactory;static{try{sessionFactory = new Configuration().configure().buildSessionFactory();}catch (Exception ex){ex.printStackTrace();}}public static Session openSession(){Session session = sessionFactory.openSession();return session;}public static void close(Session session){if(null != session){session.close();}}}
Hibernate的cfg和hbm代碼就不用貼出來了！
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