这是一个非常基本的请求响应测试.浏览器使用JQuery $.ajax API向浏览器发送“hello”到servlet,servlet收到此消息,然后使用org.json.simple库创建一个JSON对象,并向浏览器发送一条消息“hello from server”的JSOn响应.
我在localhost上运行这个,只是假设我的ip地址是123.123.12.123,平台是Ubuntu,服务器是Tomcat 6.0,在Eclipse IDE中运行.
测试1.我从Eclipse启动服务器,打开Firefox,输入http://localhost:8080/myproject/test.jsp,我可以看到servlet接收消息和浏览器收到响应,测试通过.
测试2.服务器仍然在Eclipse的Ubuntu上运行,我从VirtualBox和Windows 7中的Firefox浏览器启动Windows 7客机,输入http://123.123.12.123:8080/myproject/test.jsp,按照我的预期工作,测试通过.
测试3.服务器仍然在Eclipse在Ubuntu上运行,打开Internet Explorer 9浏览器,给它地址http://123.123.12.123:8080/myproject/test.jsp,没有任何反应.
调试给了我
响应HTTP / 1.1 200 OK
响应体{“message”：“来自服务器的hello”}
test.jsp是
<%@ 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>
<@R_404_338@ http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.js" type="text/javascript"></script>
<script type="text/javascript" src="release/js/libs/json2.js"></script>
<script>
$(document).ready(function(){
var request = ({"message":'Hello from browser'});
var jsonobj=JSON.stringify(request);
$.ajax({
data: {para:jsonobj},dataType: 'json',url: './TestServlet',type: 'POST',success: function(jsonObj){
alert(jsonObj.message);
},error: function() {
alert('Ajax readyState: '+xhr.readyState+'\nstatus: '+xhr.status + ' ' + err);
}
});
});
</script>
<body>
</body>
</html>
servlet代码是
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;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
/**
* Servlet implementation class TestServlet
*/
public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public TestServlet() {
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
}
/**
* @see HttpServlet#doPost(HttpServletRequest request,HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request,IOException {
request.setCharacterEncoding("utf8");
response.setCharacterEncoding("utf8");
response.setContentType("application/json");
PrintWriter out = response.getWriter();
JSONObject jsonObj = (JSONObject) JSONValue.parse(request.getParameter("para"));
System.out.println(jsonObj.get("message"));
JSONObject obj = new JSONObject();
obj.put("message","hello from server");
out.print(obj);
}
}
谢谢.
更新：
经过变化仔细观察
error: function() {
alert('Ajax readyState: '+xhr.readyState+'\nstatus: '+xhr.status + ' ' + err);
}
至
error: function(xhr,err) {
alert('Ajax readyState: '+xhr.readyState+'\nstatus: '+xhr.status + ' ' + err);
}
我有警告readyState：0和状态：0.
但是我可以在响应机构处看到{“message”：“hello from server”}
响应头是
Key Value Response HTTP/1.1 200 OK
解决方法
有时您需要在请求时设置缓存头控制器.像cache：false.我试图修复你的代码这样
request.setCharacterEncoding("utf8");
//response.setCharacterEncoding("utf8");
response.setContentType("application/json");
PrintWriter out = response.getWriter();
JSONObject jsonObj = (JSONObject) JSONValue.parse(request.getParameter("para"));
System.out.println(jsonObj.get("message"));
JSONObject obj = new JSONObject();
obj.put("message","hello from server");
out.print(obj);
我从应用程序/ json更改了你的响应内容类型charset = utf8只是应用程序/ json并且工作.
