Ajax请求简写

//前端页面

<!DOCTYPE html>
<html>
  <head>
    <title>ajaxTest.html</title>
	
    <Meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <Meta http-equiv="description" content="这是一个AJAX Demo">
    <Meta http-equiv="content-type" content="text/html; charset=UTF-8">
    
    <script type="text/javascript">
    
    	function loadText(){
    		
    		var textHttp = null;
    		if(window.XMLHttpRequest){
    			textHttp = new XMLHttpRequest();
    		}else{
    			textHttp =new ActiveXObject("Microsoft.XMLHTTP");
    		}
    		
    		textHttp.onreadystatechange = function(){
    			if(textHttp.readyState == 4 && textHttp.status == 200){
							document.getElementById("getBtn").innerHTML = textHttp.responseText;    				
    			}
    		}
    		
    		/**
    		 * GET请求发送 并传递参数
    		 */
    		 
    		textHttp.open("GET","/AjaxWithServlet/MyServlet?name=肖",true);// "项目名/servlet名称"
    		textHttp.send(); 
    		
    		/**
    		 * POST 请求发送并传递参数
    		 */
    		textHttp.open("POST","/AjaxWithServlet/MyServlet",true);
    		textHttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
			textHttp.send("name=肖建斌");//post 请求传递参数
    		
    	}
    	
    </script>

  </head>
  
  <body>
  	
  	<button id = "getBtn" type = "button" onclick="loadText()">获取数据</button><br><br>
  
  </body>
</html>

//后端代码

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 MyServlet extends HttpServlet {


	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void doGet(HttpServletRequest request,HttpServletResponse response)
			throws ServletException,IOException {
		doPost(request,response);
		
	}
	
	public void doPost(HttpServletRequest request,IOException {
		
		response.setCharacterEncoding("UTF-8");
		PrintWriter writer = response.getWriter();
		writer.print("这是返回的测试数据");
		
		if (request.getParameter("name") != null) {
			System.out.println("姓名：" + new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8"));
		}
	}

}

//请求路径

http://localhost:8080/AjaxWithServlet/html/ajaxTest.html

原文链接：https://www.f2er.com/ajax/161655.html

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