我要评论ajax登录案例，供大家参考，具体内容如下
msg
package com.lbl.msg;
public class msg {
string msg;
int code;
public msg() {
}
public msg(string msg, int code) {
this.msg = msg;
this.code = code;
}
public string getmsg() {
return msg;
}
public void setmsg(string msg) {
this.msg = msg;
}
public int getcode() {
return code;
}
public void setcode(int code) {
this.code = code;
}
}
registerservlet
package com.lbl.servlet;
import com.fasterxml.jackson.databind.objectmapper;
import com.lbl.msg.msg;
import javax.servlet.servletexception;
import javax.servlet.annotation.webservlet;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import java.io.ioexception;
@webservlet("/register")
public class registerservlet extends httpservlet {
protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
doget(request, response);
}
protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
//1:获取请求发送的数据
string username = request.getparameter("username");
response.setcontenttype("text/html;charset=utf-8");
//2:判断用户名是否注册
if("abc123".equals(username)){
msg msg = new msg("用户名已经注册",0);
//用户名已经注册 {"flag":false,"info":"用户名已经注册"};
// string jsonstr = "{\"flag\":false,\"info\":\"用户名已经注册\"}";
//响应回浏览器
response.getwriter().write(new objectmapper().writevalueasstring(msg));
}else{
msg msg = new msg("可以注册",1);
//用户名没有注册
// string jsonstr = "{\"flag\":true,\"info\":\"可以注册\"}";
//响应回浏览器
response.getwriter().write(new objectmapper().writevalueasstring(msg));
}
}
}
json_register.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>title</title>
<script src="js/jquery-3.3.1.js"></script>
<script type="application/javascript">
$(function () {
//1: 给用户名输入框绑定失去焦点事件(onfocus onblur)
$("#username").on("blur",function () {
//获取用户名输入框数据
var username = $("#username").val();
//2:向服务器发出异步请求，让服务器去查询用户名是否存在
$.post(
"register", //表示服务器的servlet路径
"username="+username, //表示向服务器发送的数据
function (data) { // msg:用户名已经注册 code:0
if(data.code==0){
// alert(data.info);
$("#spanid").html(data.msg).css("color","green");
}else {
$("#spanid").html(data.msg).css("color","red");
}
},
"json"
);
});
});
</script>
</head>
<body>
<div>
<font>会员注册</font>user register
<form class="form-horizontal" style="margin-top: 5px;">
<table>
<tr>
<td>用户名</td>
<td>
<input type="text" id="username" name="username" placeholder="请输入用户名">
<span id="spanid"></span>
</td>
</tr>
<tr>
<td>密码</td>
<td>
<input type="password" placeholder="请输入密码">
</td>
</tr>
</table>
<input type="submit" value="注册"/>
</form>
</div>
</body>
</html>
运行效果：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持代码网。
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