js的Ajax的POST请求和servlet文本响应的交互

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我是靠谱客的博主阳光太阳，最近开发中收集的这篇文章主要介绍js的Ajax的POST请求和servlet文本响应的交互，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

jsp页面ajax1.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'ajax1.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript">
//定义XMLHttpRequest对象
function jsAjaxPost(){
if(window.XMLHttpRequest){
var xmlhttprequest = new XMLHttpRequest();
xmlhttprequest.open('POST','./servlet/ajaxTest1');//请求方式
xmlhttprequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");//请求头
xmlhttprequest.onreadystatechange=function (){
if(xmlhttprequest.readyState===4&&xmlhttprequest.status===200){
//readyState=4表示响应接收完，status=200表示请求成功
//alert("rh--"+xmlhttprequest.getResponseHeader("Content-Type"));
var type=xmlhttprequest.getResponseHeader("Content-Type");//响应头包含text是文本响应
//alert(type);
if(type.indexOf("text")!=-1){
//alert("xxx");
var ul = document.getElementById("jsajaxpost");
ul.innerHTML += "<li>status:" + xmlhttprequest.status + "</li>";
ul.innerHTML += "<li>return:" + xmlhttprequest.responseText + "</li>";
}
}
};
xmlhttprequest.send("user=我1&com=a2");
}
}
</script>
</head>
<body>
<ul>
<li>
<a href="javascript:jsAjaxPost();">(POST)javascript ajax testing.</a>
<ul id="jsajaxpost"></ul>
</li>
</ul>
</body>
</html>

ajaxTest1.java代码:

/**
*
*/
package ajax1;
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;
/**
* @author Administrator
*
*/
public class ajaxTest1 extends HttpServlet {
/**
* Constructor of the object.
*/
public ajaxTest1() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
out.println("<HTML>");
out.println("
<HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("
<BODY>");
out.print("
This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println("
</BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("1111111");
String com=request.getParameter("com");
String user=request.getParameter("user");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.print("com:"+com+",");
out.print("user:"+user+",");
out.print("the ajax testing is success");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}

访问网址：http://localhost:8088/ajaxWeb/ajax1.jsp，点击超链接得到：