Ajax异步更新网页（使用jQuery）

jquery下载链接：https://pan.baidu.com/s/1KWQVpPV-RwhwGeBaXbZdVA
提取码：vn7x

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

巴特西

Ajax异步更新网页（使用jQuery）

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