AJAX第一步：AJAX接收返回类型为text/html的字符串数据
方苗宣
在一个javaweb项目中，可能会用到网页的局部刷新，下面我将自己总结的使用ajax进行网页刷新的知识点记录下来。请求方式有get和post方式两种，下面我分别进行了示范。
jsp页面代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>简易ajax 返回类型为Text/html</title>
</head>
<body>
<input type="button" οnclick="ajaxGETMethod()" value="ajax1点击"><div id="ajax1">111</div>
<input type="button" οnclick="ajaxPOSTMethod()" value="ajax2点击"><div id="ajax2">222</div>
</body><!-- ajax进行局部·刷新 -->
<script type="text/javascript">
function ajaxGETMethod(){
//声明对象
var xmlhttp;
//创建对象
if(window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}else{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
//请求成功的话 此方法会接收来自servlet的返回数据
xmlhttp.onreadystatechange=function() {
//如果成功请求 并且成功接受响应
if(xmlhttp.readyState==4 && xmlhttp.status==200){
//id为ajax1的里面内容 设置为servlet返回的内容
document.getElementById("ajax1").innerHTML = xmlhttp.responseText;
}
}
//设置请求method方式为get 路径 以及是否异步 get方式的Content-Type: text/plain;charset=UTF-8
xmlhttp.open("get","${pageContext.request.contextPath}/AjaxDemo_TextHTML?cmd=ajax1您好",true);
//发送请求
xmlhttp.send();
}
</script>
<script type="text/javascript">
function ajaxPOSTMethod(){
var xmlhttp;
if(window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}else{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if(xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById("ajax2").innerHTML = xmlhttp.responseText;
}
}
//设置请求method方式为post 路径 以及是否异步 post方式的Content-Type: application/x-www-form-urlencoded
xmlhttp.open("post","${pageContext.request.contextPath}/AjaxDemo_TextHTML",true);
//设置请求头
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
//发送请求
xmlhttp.send("cmd=ajax2您好");
}
</script>
</html>package cn.sdut.ajaxdemo;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/AjaxDemo_TextHTML")
public class AjaxDemo_TextHTML extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置返回类型text/html 和编码格式 使中文不乱码
response.setContentType("text/html;charset=utf-8");
//获得请求消息
String cmd = request.getParameter("cmd");System.out.println(cmd);
//响应
response.getWriter().write(cmd);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置返回类型text/html 和编码格式 使中文不乱码
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
//获得请求消息
String cmd = request.getParameter("cmd");System.out.println(cmd);
//响应
response.getWriter().write(cmd);
}
}
xmlhttp.open("post","${pageContext.request.contextPath}/AjaxDemo_TextHTML?date="+Date().getTime(),true);
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