Send request parameters to the Internet

Code:

1. Using the httpurlconnection object, we can send request parameters to the network.
2. String requesturl = "http: // localhost: 8080/itcast/contanctmanage. Do ";
3. Map <string, string> requestparams = new hashmap <string, string> ();
4. Requestparams. Put ("Age", "12 ");
5. Requestparams. Put ("name", "China ");
6. Stringbuilder Params = new stringbuilder ();
7. For (Map. Entry <string, string> entry: requestparams. entryset ()){
8. Params. append (entry. getkey ());
9. Params. append ("= ");
10. Params. append (urlencoder. encode (entry. getvalue (), "UTF-8 "));
11. Params. append ("&");
12. }
13. If (Params. Length ()> 0) Params. deletecharat (Params. Length ()-1 );
14. Byte [] DATA = Params. tostring (). getbytes ();
15. URL realurl = new URL (requesturl );
16. Httpurlconnection conn = (httpurlconnection) realurl. openconnection ();
17. Conn. setdooutput (true); // The output must be allowed when a POST request is sent.
18. Conn. setusecaches (false); // No cache is used.
19. Conn. setrequestmethod ("Post ");
20. Conn. setrequestproperty ("connection", "keep-alive"); // maintain a persistent connection
21. Conn. setrequestproperty ("charset", "UTF-8 ");
22. Conn. setrequestproperty ("Content-Length", String. valueof (data. Length ));
23. Conn. setrequestproperty ("Content-Type", "application/X-WWW-form-urlencoded ");
24. Dataoutputstream outstream = new dataoutputstream (conn. getoutputstream ());
25. Outstream. Write (data );
26. Outstream. Flush ();
27. If (conn. getresponsecode () = 200 ){
28. String result = readasstring (conn. getinputstream (), "UTF-8 ");
29. Outstream. Close ();
30. System. Out. println (result );
31. }

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