Ajax的请求（post,get）

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<%--  Created by IntelliJ IDEA.  User: linlin  Date: 2017/7/14  Time: 9:31  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><script type="text/javascript" src="js/jquery.js"></script><script type="text/javascript">    $(function(){$("[name=uname]").blur(function () {    var xhr=null;    if(window.XMLHttpRequest){        xhr=new XMLHttpRequest();    }else{        xhr=new ActiveXObject("Microsoft.XMLHTTP");    }    xhr.open("GET","/FirstServlet?uname="+$("[name=uname]").val(),true);    xhr.onreadystatechange=function () {        if(xhr.readyState==4&&xhr.status==200){            var data=xhr.responseText;            var dom=document.getElementById("msg");            dom.innerText=data;        }    }    xhr.send(null);})    })</script><html><head>    <title>Title</title></head><body><input name="uname"><span id="msg"></span></body></html>

package cn.happy;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/** * Created by linlin on 2017/7/14. */public class FirstServlet extends HttpServlet {    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        String name=request.getParameter("uname");        if(name.equals("admin")){            response.getWriter().write("true2");        }else{            response.getWriter().write("false");        }    }    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request,response);    }}

对于请求我们分为Post 和Get 但是提交的的方法有一定区别，彼此的利害关系也不一样

上面是我们Get请求

下面是我们Post请求，没特大的变化。这也只是个入门。。。

<%--  Created by IntelliJ IDEA.  User: linlin  Date: 2017/7/14  Time: 9:31  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><script type="text/javascript" src="js/jquery.js"></script><script type="text/javascript">    $(function(){$("[name=uname]").blur(function () {    var xhr=null;    if(window.XMLHttpRequest){        xhr=new XMLHttpRequest();    }else{        xhr=new ActiveXObject("Microsoft.XMLHTTP");    }    xhr.open("POST","/FirstServlet?uname="+$("[name=uname]").val(),true);    xhr.onreadystatechange=function () {        if(xhr.readyState==4&&xhr.status==200){            var data=xhr.responseText;            var dom=document.getElementById("msg");            dom.innerText=data;        }    }    xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");    xhr.send("uname="+$('[name=uname]').val());})    })</script><html><head>    <title>Title</title></head><body><input name="uname"><span id="msg"></span></body></html>

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