JSP + Servlet 实现 AJAX（纯JS版）_jsp+servlet ajax-优快云博客

本文链接：https://blog.youkuaiyun.com/xiaoyustudiowww/article/details/145893470

==============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>

<title>晓雨 JSP + Servlet 实现 AJAX</title>

function smallRainShowData() {

var smallrainAjAXRequest = new XMLHttpRequest();

smallrainAjAXRequest.open('GET', 'mulAJAXPageSystem', true);

smallrainAjAXRequest.send();

smallrainAjAXRequest.onreadystatechange = function() {

if (smallrainAjAXRequest.readyState === 4