One-stop solution to the Cross-domain problem of Java

This article mainly explains "one-stop solution to cross-domain problems in Java". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "one-stop solution to cross-domain problems in Java".

(1) js side processing: usually in the way of ajax, the following is the processing code

$.ajax ({type: "GET", url: 'common/goBD.do', xhrFields: {withCredentials: true}, crossDomain: true, success: function (data) {window.open ("http://www.baidu.com");}}))

Here we mainly pay attention to the code: xhrFields: {withCredentials: true}, indispensable; url is the address of the access server. After a successful return, you can jump to the Baidu page (open the tab page newly, of course, you can also open it on the original page).

(2) Server processing: by setting the response header information, the following is the processing code

@ RequestMapping (value= "/ goBD") public void goBD (HttpServletResponse response,HttpServletRequest request) throws IOException {String msg = "; String result =" {\ "msg\": "+ msg+"} "; PrintWriter out = response.getWriter (); response.setHeader (" Access-Control-Allow-Credentials "," true "); response.setHeader (" Access-Control-Allow-Origin ", request.getHeader (" Origin ")) Response.setHeader ("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); response.setHeader ("Access-Control-Max-Age", "0"); response.setCharacterEncoding ("utf-8"); out = response.getWriter (); out.write (result); out.flush (); out.close ();}

Here, we simply deal with the response header information, and do not add anything else. If there are other judgments, such as login, you can enter the user name and password on the js side for judgment processing, and make different processing in the front end by returning the value.

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