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一個最基礎完整版的ajax專案

jsp檔案


<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2018/9/14
  Time: 19:57
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
    <script type
="text/javascript"> function sendHttpRequest() { //步驟一建立XMLHttpRequest物件 var xhr = new XMLHttpRequest(); //步驟二設定請求方式及請求路徑 xhr.open("get","AJAXAction"); //步驟三傳送請求 xhr.send(); //步驟四獲取回撥函式 xhr.onreadystatechange = function () { if
(xhr.readyState == 4 && xhr.status == 200){ alert(xhr.responseText); } } } </script> </head> <body> <input type="button" onclick="sendHttpRequest()" value="準備好開始爽了嗎"> </body> </html> java package
com.tjetc.demo; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; public class AJAXAction extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("UTF-8"); resp.setCharacterEncoding("UTF-8"); PrintWriter out = resp.getWriter(); out.print("你通過AJAXAction對我進行了訪問爽了嗎"); } }
WEB.XML
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
 <servlet>
     <servlet-name>AJAXAction</servlet-name>
     <servlet-class>com.tjetc.demo.AJAXAction</servlet-class>

 </servlet>
    <servlet-mapping>
        <servlet-name>AJAXAction</servlet-name>
        <url-pattern>/AJAXAction</url-pattern>
    </servlet-mapping>
</web-app>