html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Js</title>
</head>
<body>
<input type="text" id="param1" />
<input type="text" id="param2" />
<button onclick="ajax()">Go!</button>
</body>
</html>
<script>
function createXMLHttpRequest() {
var XMLHttpRequest1;
if (window.XMLHttpRequest) {
XMLHttpRequest1 = new XMLHttpRequest();
} else if (window.ActiveXObject) {
try {
XMLHttpRequest1 = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
XMLHttpRequest1 = new ActiveXObject("Microsoft.XMLHTTP");
}
}
return XMLHttpRequest1;
}
function ajax() {
//param1与param2就是用户在输入框的两个参数
var param1=document.getElementById("param1").value;
var param2=document.getElementById("param2").value;
var XMLHttpRequest1 = createXMLHttpRequest();
//指明相应页面
var url = "http://192.168.0.111:8080/AjaxServer/Test";
XMLHttpRequest1.open("POST", url, true);
//这里没法解释，你所有JavaScript的请求头都这样写就对了，不会乱码
XMLHttpRequest1.setRequestHeader("Content-Type",
"application/x-www-form-urlencoded");
//对于ajaxRequest，本js.html将会传递param1与param2给你。
XMLHttpRequest1.send("param1=" + param1 + "¶m2=" + param2);
//对于返回结果怎么处理的问题
XMLHttpRequest1.onreadystatechange = function() {
//这个4代表已经发送完毕之后
if (XMLHttpRequest1.readyState == 4) {
//200代表正确收到了返回结果
if (XMLHttpRequest1.status == 0) {
//弹出返回结果
alert(XMLHttpRequest1.responseText);
} else {
//如果不能正常接受结果，你肯定是断网，或者我的服务器关掉了。
alert("网络连接中断！");
}
}
};
}
</script>
servlet：
/**
* Servlet implementation class Test
*/
@WebServlet("/Test")
public class Test extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Test() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html; charset=utf-8");
PrintWriter pw = response.getWriter();
request.setCharacterEncoding("utf-8");
String param1=request.getParameter("param1");
System.out.println("param1="+param1);
String param2=request.getParameter("param2");
System.out.println("，param2="+param2);
pw.print("param1="+param1+"，param2="+param2);
pw.flush();
pw.close();
}
}
前段发送的请求servlet收到了，并且处理了，可是前段接收到结果总是为空，并且XMLHttpRequest1.status==0，求问哪里出了问题
