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Java Web get requests cross-domain

Source: Internet
Author: User
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http://hw1287789687.iteye.com/blog/2188617

How do I cross-domain requests in the Java Web?

For more information, please refer to Jsonp: http://json-p.org/

The page code is as follows:

HTML code
  2. <! DOCTYPE HTML>
  4. <html>
  6. <head lang="en">
  8. <meta charset="UTF-8">
  10. <title></title>
  12. <script type="Application/javascript" >
  14. function Jsonpcallback (Result) {
  16. Alert (json.stringify (result));
  18. /*for (var i in result) {
  20. Alert (i+ ":" +result[i]);//loop output a:1,b:2,etc.
  22. }  */
  24. }
  26. var jsonp=document.createelement ("script");
  28. jsonp.type="Text/javascript";
  30. jsonp.src="Http://192.168.0.100:8080/tv_mobile/video/text2?callback=jsonpCallback";
  32. document.getElementsByTagName ("Head") [0].appendchild (JSONP);
  34. </Script>
  36. </head>
  38. <body>
  42. </body>
  44. </html>

Effects that are accessed in the browser:

The background uses spring MVC:

Java code
  2. @ResponseBody
  4. @RequestMapping (value = "/text2", Produces=systemhwutil.response_contenttype_javascript2)
  6. Public String Text2 (httpservletrequest request, HttpServletResponse response,string Contenttype2,string callback)
  8. throws IOException {
  10. String content = null;
  12. Map map = new HashMap ();
  16. Map.put ("FileName", "a.txt");
  18. CONTENT=JSONPUTIL.GETJSONP (map, callback);
  20. SYSTEM.OUT.PRINTLN (content);
  22. return content;
  26. }

The Jsonputil.getjsonp static method is implemented as follows:

Java code
  2. /***
  4. * For JSONP calls
  6. * @param map: Used to construct JSON data
  8. * @param callback: The JavaScript method name of the callback
  10. * @return
  12. */
  14. public static String Getjsonp (Map map,string callback)
  16. {
  18. Objectmapper mapper = new Objectmapper ();
  20. String content = null;
  22. try {
  24. Content = mapper.writevalueasstring (map);
  26. SYSTEM.OUT.PRINTLN (content);
  28. } catch (Jsongenerationexception e) {
  30. E.printstacktrace ();
  32. } catch (Jsonmappingexception e) {
  34. E.printstacktrace ();
  36. } catch (IOException e) {
  38. E.printstacktrace ();
  40. }
  42. if (Valuewidget.isnullorempty (callback)) {
  44. return content;
  46. }
  48. return callback+"(" +content+")";
  50. }

Rely on the Jackson Library

What is returned in the background is:jsonpcallback ({"FileName": "A.txt"})

Content Type is

Note: The form returned in the background is the function name ( parameter), where the function name is the name of the callback function

Reference:

Spring MVC sets the content type of the responder body

AJAX cross-domain request-JSONP get JSON data:http://justcoding.iteye.com/blog/1366102

APP Framework Send JSONP request (3): http://hw1287789687.iteye.com/blog/2190719

Java Web get request cross-domain (GO)

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Related Keywords:
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