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Simple and practical example code of Ajax

韦小宝

Jan 01, 2018 pm 07:39 PM

ajax code Example

This article mainly introduces the simple and practical example code of Ajax. Friends who are interested in ajax can refer to the simple and practical method of Ajax

I will implement a simple Ajax page for user verification without refreshing. Case:

The effect is as follows:

The main process of implementation:

Receive and verify the foreground in the checkUser method in the UsersAction class Form data, for different situations, returns a status code code to the jsp page, and then uses the $.post method in ajax1.jsp to accept the status code

passed from the background to make different responses.

The specific code is as follows:

1. Entity class

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();
 }
}

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2.action class

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;
 }
}

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##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 == &#39;0&#39;) {
     alert("用户名和密码错误！");
     return;
    }
    if(msg == &#39;1&#39;) {
     $("#uerror").html("用户名错误！");
     return;
    } else {
     $("#uerror").html("*");
    }
    if(msg == &#39;2&#39;) {
     $("#perror").html("密码错误！");
     return;
    } else {
     $("#perror").html("*");
    }
    if(msg == &#39;200&#39;) {
     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>

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The above is a simple and practical example code of Ajax introduced by the editor. I hope it will be helpful to everyone!

Related recommendations:

Detailed explanation of the example of ajax implementation of input prompt effect

##Sharing about the method of ajax jumping to a new jsp page

Detailed explanation of how to use Ajax to partially update Razor pages

The above is the detailed content of Simple and practical example code of Ajax. For more information, please follow other related articles on the PHP Chinese website!

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