Getting Started with Android: sending HTTP GET and POST requests

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

2. Package org.xiazdong.servlet;
6. Import java.io.IOException;
8. Import javax.servlet.ServletException;
10. Import Javax.servlet.annotation.WebServlet;
12. Import Javax.servlet.http.HttpServlet;
14. Import Javax.servlet.http.HttpServletRequest;
16. Import Javax.servlet.http.HttpServletResponse;
20. @WebServlet ("/printservlet")
22. Public class Printservlet extends HttpServlet {
26. protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
28. String name = new String (Request.getparameter ("name"). GetBytes ("iso-8859-1"),"UTF-8");
30. String age = New String (Request.getparameter ("Age"). GetBytes ("iso-8859-1"),"UTF-8");
32. System.out.println ("Name:" +name+"\ n Age:" +age);
34. }
38. protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
40. Request.setcharacterencoding ("UTF-8");
42. System.out.println ("Name:" +request.getparameter ("name") +"\ n Age:" +request.getparameter ("ages");
44. }
46. }

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

2. Package org.xiazdong.network.submit;
6. Import Java.io.OutputStream;
8. Import java.net.HttpURLConnection;
10. Import Java.net.URL;
12. Import Java.net.URLEncoder;
16. Import android.app.Activity;
18. Import Android.os.Bundle;
20. Import Android.view.View;
22. Import Android.view.View.OnClickListener;
24. Import Android.widget.Button;
26. Import Android.widget.EditText;
28. Import Android.widget.Toast;
32. Public class Mainactivity extends Activity {
34. private EditText name, age;
36. private Button Getbutton, Postbutton;
38. private Onclicklistener listener = New Onclicklistener () {
40. @Override
42. public void OnClick (View v) {
44. try{
46. if (Getbutton = = v) {
48. /* 
50. * Because it is a GET request, the request parameter needs to be added to the URL, and URL encoding is also required
52. * URL = http://192.168.0.103:8080/Server/PrintServlet?name=%E6%88%91&age=20
54. * URL encoding is required here because URL encoding is automatically made when the browser commits
56. * */
58. StringBuilder buf = new StringBuilder ("Http://192.168.0.103:8080/Server/PrintServlet");
60. Buf.append ("?");
62. Buf.append ("Name=" +urlencoder.encode (Name.gettext (). toString (),"UTF-8") +"&");
64. Buf.append ("age=" +urlencoder.encode (Age.gettext (). toString (),"UTF-8"));
66. URL url = new URL (buf.tostring ());
68. HttpURLConnection conn = (httpurlconnection) url.openconnection ();
70. Conn.setrequestmethod ("GET");
72. if (conn.getresponsecode () = =){
74. Toast.maketext (mainactivity.   This, "get submitted successfully", Toast.length_short). Show ();
76. }
78. Else Toast.maketext (mainactivity.   This, "get commit Failed", Toast.length_short). Show ();
80. }
82. if (Postbutton = = v) {
84. /* 
86. * If it is a POST request, the request parameter is placed in the request body,
88. * NAME=%E6%88%91&AGE=12
90. *
92. * */
94. StringBuilder buf = new StringBuilder ();
96. Buf.append ("Name=" +urlencoder.encode (Name.gettext (). toString (),"UTF-8") +"&");
98. Buf.append ("age=" +urlencoder.encode (Age.gettext (). toString (),"UTF-8"));
100. byte[]data = buf.tostring (). GetBytes ("UTF-8");
102. URL url = new URL ("Http://192.168.0.103:8080/Server/PrintServlet");
104. HttpURLConnection conn = (httpurlconnection) url.openconnection ();
106. Conn.setrequestmethod ("POST");
108. Conn.setdooutput (true); //If you want to export, you must add this sentence
110. OutputStream out = Conn.getoutputstream ();
112. Out.write (data);
114. if (conn.getresponsecode () = =){
116. Toast.maketext (mainactivity.   This, "get submitted successfully", Toast.length_short). Show ();
118. }
120. Else Toast.maketext (mainactivity.   This, "get commit Failed", Toast.length_short). Show ();
122. }
124. }
126. catch (Exception e) {
130. }
132. }
134. };
138. @Override
140. public void OnCreate (Bundle savedinstancestate) {
142. super.oncreate (savedinstancestate);
144. Setcontentview (R.layout.main);
146. Name = (EditText) This.findviewbyid (r.id.name);
148. Age = (EditText) This.findviewbyid (r.id.age);
150. Getbutton = (Button) This.findviewbyid (R.id.getbutton);
152. Postbutton = (Button) This.findviewbyid (R.id.postbutton);
154. Getbutton.setonclicklistener (listener);
156. Postbutton.setonclicklistener (listener);
158. }
160. }

Getting Started with Android: sending HTTP GET and POST requests