如何使用java从任何webdomain或本地系统读取特定IP地址上的文件？

我有一个程序在特定的

IP

上运行，并将输出放在同一系统的文件中。
我想从jsp页面使用ajax和jquery从其他系统或域（web）读取该文件

我收到不允许跨浏览器原点的

错误

如何解决此错误以发出跨浏览器ajax请求

---

提前感谢您。

如果我将数据类型指定为jsonp，是否需要添加回调函数？是的，您需要。在服务器端也是如此。我如何在服务器端定义它？见下面我的答案。我已经解释了一切。我如何处理.java页面上的回调？？或者没有必要处理它？？您已经在解决方案中指定了它，但我在line out.println（req…）上遇到了错误。。。。。。

$.ajax({
  url: url,
  dataType: "jsonp",
  success: function (data) {
    console.log(data)
    alert(data);
  }
});

You can’t query domain B via ajax on domain A's page. 

javascript load is allowed as an exception. (We are loading fb and twitter js the same way)

Workaround:

Jquery has provided method getJSON which expects a js return from server. All we need to do is to pass 

a '?' as a parameter value. In following case, 

we are passing 'callback' parameter with value '?'

$.getJSON('http://www.otherserver.com/somedestination.htm?callback=?','firstname=Jeff',function(res){

 alert('logged in: '+res.some_text);

 });

For this call, JQuery will call server as: 

http://www.otherserver.com/somedestination.htm?

callback=jQuery16200023653062526136637_1386745308424&firstname=Jeff&_=1386745308439

Now if we look closely, the value for '?' is : jQuery16200023653062526136637_1386745308424.

JQuery creates a global JS function in window DOM named 

jQuery16200023653062526136637_1386745308424(response)

At server we extract this parameter (callback) and make a function String. In this function we will pass 

the value we want to return to the Browser: 

out.print(request.getparameter("callback")({'some_text' : '23897932823sdfhsdkfvhs32432'})

This will return 

 jQuery16200023653062526136637_1386745308424(({'some_text' : 'value of the text output'}) 

 to the browser

Jquery will execute this function and will pass the string to our getJSON function parameter.