一、页面代码
<!DOCTYPE html>
<html>
<head>
<title>MyHtml.html</title>
<meta name="keywords" content="keyword1,keyword2,keyword3">
<meta name="description" content="this is my page">
<meta name="content-type" content="text/html; charset=UTF-8">
<body>
<table>
<tr>
<td>Login:</td>
<td><input id="username" type="text" name="login"></td>
</tr>
<tr>
<td>Password:</td>
<td><input type="password" name="password" id="password"></td>
</tr>
<tr>
<td colspan="2"><input type="submit"></td>
</tr>
</table>
</body>
</html>
二、jQuery代码
// 导入jQuery<script type="text/javascript" src="../js/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#username").keyup(function() {
var value = $(this).val();
var strData = "username=" + value;
$.ajax({
url : "MyServlet1",
type : "get",
//data : {"username":value}, // json格式
data: strData,
dataType : "text",
success : function(data, strStatus, xhr) {
if (data == "已使用")
$("#username").css("border-color", "red");
else
$("#username").css("border-color", "green");
},
error : function(xhr, strStatus, strError) {
alert(strError);
}
});
});
});
</script>
三、servlet代码
package com.yh.myServlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyServlet1 extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
String userName = request.getParameter("username");
System.out.println(userName);
if (userName.equals("yh")) {
out.print("已使用");
} else {
out.print("可使用");
}
}
}
四、配置servlet
<servlet>
<servlet-name>MyServlet1</servlet-name>
<servlet-class>com.yh.myServlet.MyServlet1</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet1</servlet-name>
<url-pattern>/Pages/MyServlet1</url-pattern>
</servlet-mapping>
注：这个Pages是根据html页面的路径设置的
原文地址：https://www.cnblogs.com/YeHuan/p/10993905.html
时间： 2024-11-13 10:10:19