JSP + Servlet 实现 AJAX（纯JS版）
==============java 文件，包名org.rain.servlet
package org.rain.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletConfig;
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 org.rain.bean.PageSystemBean;
@WebServlet("/mulAJAXPageSystem")
public class MulAJAXPage extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
out.println("<b> SmallRain AjAX 请求返回数据 </b");
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
======================JSP文件
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta charset="UTF-8">
<title>晓雨 JSP + Servlet 实现 AJAX</title>
<script>
function smallRainShowData() {
var smallrainAjAXRequest = new XMLHttpRequest();
smallrainAjAXRequest.open('GET', 'mulAJAXPageSystem', true);
smallrainAjAXRequest.send();
smallrainAjAXRequest.onreadystatechange = function() {
if (smallrainAjAXRequest.readyState === 4
&& smallrainAjAXRequest.status === 200) {
var showData = smallrainAjAXRequest.responseText;
document.getElementById('smallrainContent').innerHTML = showData;
}
}
}
</script>
</head>
<body>
<h1>晓雨 JSP + Servlet 实现 AJAX</h1>
<button οnclick="smallRainShowData()">AJAX 请求</button>
<div id="smallrainContent"></div>
</body>
</html>