Ajax的简单实用实例代码

这篇文章主要介绍了Ajax的简单实用实例代码,需要的朋友可以参考下

我将实现一个简单的Ajax页面无刷新进行用户验证案例：

效果如下图：

实现主要过程：

在UsersAction类中的checkUser方法中接收并验证前台的表单数据，针对不同情况，返回一个状态码code给jsp页面，然后在ajax1.jsp中通过$.post方法接受后台传递过来的状态码

做出不同的响应。

具体代码如下：

1.实体类

 package com.bean; import java.io.Serializable; public class Users implements Serializable { private String uname; private String passwd; public String getUname() { return uname; } public void setUname(String uname) { this.uname = uname; } public String getPasswd() { return passwd; } public void setPasswd(String passwd) { this.passwd = passwd; } public Users(String uname, String passwd) { super(); this.uname = uname; this.passwd = passwd; } public Users() { super(); } }

2.action类

 package com.action; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.ServletActionContext; import org.apache.struts2.convention.annotation.Action; import com.bean.Users; public class UsersAction { private Users us; public Users getUs() { return us; } public void setUs(Users us) { this.us = us; } @Action(value="checkUser") public String checkUser() { System.out.println("aaaaaaaaa"); HttpServletResponse response = ServletActionContext.getResponse(); response.setCharacterEncoding("utf-8"); try { PrintWriter out = response.getWriter(); int code = 0; if (us == null) { out.print(0); return null; } else { if (us.getUname() == null || us.getUname().trim().equals("")) { code = 1; out.print(code); return null; } else { if (us.getPasswd() == null || us.getPasswd().trim().equals("")) { code = 2; out.print(code); return null; } else { code = 200; out.print(code); } } } out.flush(); out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } }

3.ajax1.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>  Ajax练习    用户注册
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