Ajax的简单实用实例代码-巨人网络通讯

Ajax的简单实用实例代码

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+"/";
%>
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
html>
 head>
 base href="%=basePath%>" rel="external nofollow" >
 title>Ajax练习/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">
 !--
 link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" >
 -->
script type="text/javascript" src="js/jquery-1.9.1.js">/script>
script>
 $(function() {
  $("#btok").click(function() {
   //获取数据
   var uname = $("#uname").val();
   var passwd = $("#passwd").val();
   //将数据组织为json格式
   var json = {"us.uname":uname,"us.passwd":passwd};
   //进行异步请求
   $.post("checkUser.action",json,function(msg){
    if(msg == '0') {
     alert("用户名和密码错误！");
     return;
    }
    if(msg == '1') {
     $("#uerror").html("用户名错误！");
     return;
    } else {
     $("#uerror").html("*");
    }
    if(msg == '2') {
     $("#perror").html("密码错误！");
     return;
    } else {
     $("#perror").html("*");
    }
    if(msg == '200') {
     alert("登陆成功！");
     return;
    }
   });
  });
 });
/script>
 /head>
 body>
 form name="form1" method="post" action="">
 table width="450" border="1" align="center" cellpadding="1" cellspacing="0">
  tr>
  td colspan="2" align="center" valign="middle" bgcolor="#FFFFCC">用户注册/td>
  /tr>
  tr>
  td width="88">账号:/td>
  td width="352">label for="uname">/label>
  input type="text" name="uname" id="uname">
  span id="uerror" style="color:#F06;">*/span>/td>
  /tr>
  tr>
  td>密码:/td>
  td>label for="passwd">/label>
  input type="password" name="passwd" id="passwd">
  span id="perror" style="color:#F06;">*/span>/td>
  /tr>
  tr align="center" valign="middle" bgcolor="#FFFFCC">
  td colspan="2">input type="button" name="button" id="btok" value="确定">
  input type="reset" name="button2" id="button2" value="重置">/td>
  /tr>
 /table>
 /form>
 br>
 /body>
/html>

以上所述是小编给大家介绍的Ajax的简单实用实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！

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