Getting Started with Android: sending HTTP GET and POST requests

Source: Internet
Author: User
Tags http post

An explanation of HTTP requests has been explained in my blog:

http://blog.csdn.net/xiazdong/article/details/7215296

I have encapsulated a helper class for HTTP requests in http://blog.csdn.net/xiazdong/article/details/7725867, so it is easy to send get, post requests;

such as Httprequestutil.sendgetrequest (); Is to send a GET request;

First, the core code

HTTP GET Core Code:

(1) String value = Urlencoder.encode (String value, "UTF-8");

(2) String Path = "http://../path?key=" +value;

(3) URL url = new URL (path);//URL encoding is required for URLs here;

(4) HttpURLConnection con = (httpurlconnection) url.openconnection ();

(5) Con.setrequestmethod ("GET");

(6) Con.setdooutput (true);

(7) OutputStream out = Con.getoutputstream ();

(8) Out.write (BYTE[]BUF);

(9) Int code = Con.getresponsecode ();

HTTP POST Core Code:

(1) String value = Urlencoder.encode (String value, "UTF-8");

(2) Byte[]buf = ("key=" +value). GetBytes ("UTF-8");

(3) String Path = "Http://../path";

(4) URL url = new URL (path);//URL encoding is required for URLs here;

(5) HttpURLConnection con = (httpurlconnection) url.openconnection ();

(6) Con.setrequestmethod ("POST");

(7) Con.setdooutput (true);

(8) OutputStream out = Con.getoutputstream ();

(9) Out.write (BYTE[]BUF);

(ten) int code = Con.getresponsecode ();

Second, get and post garbled solution method

GET:  

Add in Doget:

String name = new String (Request.getparameter ("name"). GetBytes ("Iso-8859-1"), "UTF-8");

POST:  

Add in Dopost:

Request.setcharacterencoding ("UTF-8");

For more information, see my blog:

http://blog.csdn.net/xiazdong/article/details/7217022

Third, server-side code

[Java]View PlainCopy
  1. Package org.xiazdong.servlet;
  2. Import java.io.IOException;
  3. Import javax.servlet.ServletException;
  4. Import Javax.servlet.annotation.WebServlet;
  5. Import Javax.servlet.http.HttpServlet;
  6. Import Javax.servlet.http.HttpServletRequest;
  7. Import Javax.servlet.http.HttpServletResponse;
  8. @WebServlet ("/printservlet")
  9. Public class Printservlet extends HttpServlet {
  10. protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
  11. String name = new String (Request.getparameter ("name"). GetBytes ("iso-8859-1"),"UTF-8");
  12. String age = New String (Request.getparameter ("Age"). GetBytes ("iso-8859-1"),"UTF-8");
  13. System.out.println ("Name:" +name+"\ n Age:" +age);
  14. }
  15. protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
  16. Request.setcharacterencoding ("UTF-8");
  17. System.out.println ("Name:" +request.getparameter ("name") +"\ n Age:" +request.getparameter ("ages");
  18. }
  19. }


Four, the Android terminal code

Join in Androidmanifest.xml:

[HTML]View PlainCopy
    1. <uses-permission android:name="Android.permission.INTERNET"/>


Mainactivity.java

[Java]View PlainCopy
  1. Package org.xiazdong.network.submit;
  2. Import Java.io.OutputStream;
  3. Import java.net.HttpURLConnection;
  4. Import Java.net.URL;
  5. Import Java.net.URLEncoder;
  6. Import android.app.Activity;
  7. Import Android.os.Bundle;
  8. Import Android.view.View;
  9. Import Android.view.View.OnClickListener;
  10. Import Android.widget.Button;
  11. Import Android.widget.EditText;
  12. Import Android.widget.Toast;
  13. Public class Mainactivity extends Activity {
  14. private EditText name, age;
  15. private Button Getbutton, Postbutton;
  16. private Onclicklistener listener = New Onclicklistener () {
  17. @Override
  18. public void OnClick (View v) {
  19. try{
  20. if (Getbutton = = v) {
  21. /* 
  22. * Because it is a GET request, the request parameter needs to be added to the URL, and URL encoding is also required
  23. * URL = http://192.168.0.103:8080/Server/PrintServlet?name=%E6%88%91&age=20
  24. * URL encoding is required here because URL encoding is automatically made when the browser commits
  25. * */
  26. StringBuilder buf = new StringBuilder ("Http://192.168.0.103:8080/Server/PrintServlet");
  27. Buf.append ("?");
  28. Buf.append ("Name=" +urlencoder.encode (Name.gettext (). toString (),"UTF-8") +"&");
  29. Buf.append ("age=" +urlencoder.encode (Age.gettext (). toString (),"UTF-8"));
  30. URL url = new URL (buf.tostring ());
  31. HttpURLConnection conn = (httpurlconnection) url.openconnection ();
  32. Conn.setrequestmethod ("GET");
  33. if (conn.getresponsecode () = =){
  34. Toast.maketext (mainactivity.   This, "get submitted successfully", Toast.length_short). Show ();
  35. }
  36. Else Toast.maketext (mainactivity.   This, "get commit Failed", Toast.length_short). Show ();
  37. }
  38. if (Postbutton = = v) {
  39. /* 
  40. * If it is a POST request, the request parameter is placed in the request body,
  41. * NAME=%E6%88%91&AGE=12
  42. *
  43. * */
  44. StringBuilder buf = new StringBuilder ();
  45. Buf.append ("Name=" +urlencoder.encode (Name.gettext (). toString (),"UTF-8") +"&");
  46. Buf.append ("age=" +urlencoder.encode (Age.gettext (). toString (),"UTF-8"));
  47. byte[]data = buf.tostring (). GetBytes ("UTF-8");
  48. URL url = new URL ("Http://192.168.0.103:8080/Server/PrintServlet");
  49. HttpURLConnection conn = (httpurlconnection) url.openconnection ();
  50. Conn.setrequestmethod ("POST");
  51. Conn.setdooutput (true); //If you want to export, you must add this sentence
  52. OutputStream out = Conn.getoutputstream ();
  53. Out.write (data);
  54. if (conn.getresponsecode () = =){
  55. Toast.maketext (mainactivity.   This, "get submitted successfully", Toast.length_short). Show ();
  56. }
  57. Else Toast.maketext (mainactivity.   This, "get commit Failed", Toast.length_short). Show ();
  58. }
  59. }
  60. catch (Exception e) {
  61. }
  62. }
  63. };
  64. @Override
  65. public void OnCreate (Bundle savedinstancestate) {
  66. super.oncreate (savedinstancestate);
  67. Setcontentview (R.layout.main);
  68. Name = (EditText) This.findviewbyid (r.id.name);
  69. Age = (EditText) This.findviewbyid (r.id.age);
  70. Getbutton = (Button) This.findviewbyid (R.id.getbutton);
  71. Postbutton = (Button) This.findviewbyid (R.id.postbutton);
  72. Getbutton.setonclicklistener (listener);
  73. Postbutton.setonclicklistener (listener);
  74. }
  75. }


Getting Started with Android: sending HTTP GET and POST requests

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