Get started with Android: Send http get and post requests

Document directory

• Get:

HTTP request details have been explained in my blog:

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

I have encapsulated an HTTP request helper class in the http://blog.csdn.net/xiazdong/article/details/7725867, so it can be very simple to send get, post requests;

For example, httprequestutil. sendgetrequest (); is to send a GET request;

I. Core code

Core http get code:

(1) string value = urlencoder. encode (string value, "UTF-8 ");

(2) string Path = "http: // ../path? Key = "+ value;

(3) url = new URL (PATH); // The URL must be URL encoded;

(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 ();

Core http post 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 = new URL (PATH); // The URL here needs to be URL encoded;

(5) httpurlconnection con = (httpurlconnection) URL. openconnection ();

(6) con. setrequestmethod ("Post ");

(7) con. setdooutput (true );

(8) outputstream out = con. getoutputstream ();

(9) Out. Write (byte [] BUF );

(10) int code = con. getresponsecode ();

Ii. Get and post garbled Solutions

Get:

Add the following to doget:

String name = new string (request. getparameter ("name"). getbytes ("ISO-8859-1"), "UTF-8 ");

Post:

Add the following to dopost:

Request. setcharacterencoding ("UTF-8 ");

For more information, see my blog:

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

Iii. server code

Package Org. xiazdong. servlet; import Java. io. ioexception; import javax. servlet. servletexception; import javax. servlet. annotation. webservlet; import javax. servlet. HTTP. httpservlet; import javax. servlet. HTTP. httpservletrequest; import javax. servlet. HTTP. httpservletresponse; @ webservlet ("/printservlet") public class printservlet extends httpservlet {protected void doget (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {string name = new string (request. getparameter ("name "). getbytes ("ISO-8859-1"), "UTF-8"); string age = new string (request. getparameter ("Age "). getbytes ("ISO-8859-1"), "UTF-8"); system. out. println ("name:" + name + "\ n age:" + age);} protected void dopost (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {request. setcharacterencoding ("UTF-8"); system. out. println ("name:" + request. getparameter ("name") + "\ n age:" + request. getparameter ("Age "));}}

Iv. Android code

Add the following in androidmanifest. xml:

<uses-permission android:name="android.permission.INTERNET"/>

Mainactivity. Java

Package Org. xiazdong. network. submit; import Java. io. outputstream; import java.net. httpurlconnection; import java.net. URL; import java.net. urlencoder; import android. app. activity; import android. OS. bundle; import android. view. view; import android. view. view. onclicklistener; import android. widget. button; import android. widget. edittext; import android. widget. toast; public class mainactivity extends activity {priva Te edittext name, age; private button getbutton, postbutton; private onclicklistener listener = new onclicklistener () {@ overridepublic void onclick (view v) {try {If (getbutton = V) {/** because it is a GET request, you need to add the request parameters to the URL and perform URL encoding * url = http: // 192.168.0.103: 8080/Server/printservlet? Name = % E6 % 88% 91 & age = 20 * URL encoding is required here because the browser automatically performs URL encoding when submitting **/stringbuilder Buf = new stringbuilder ("http: // 192.168.0.103: 8080/Server/printservlet "); Buf. append ("? "); Buf. append ("name =" + urlencoder. encode (name. gettext (). tostring (), "UTF-8") + "&"); Buf. append ("age =" + urlencoder. encode (age. gettext (). tostring (), "UTF-8"); Url url = new URL (BUF. tostring (); httpurlconnection conn = (httpurlconnection) URL. openconnection (); Conn. setrequestmethod ("get"); If (Conn. getresponsecode () = 200) {toast. maketext (mainactivity. this, "Get submitted", toast. length_short ). show ();} else toast. maketext (mainactivity. this, "Get submission failed", toast. length_short ). show ();} If (postbutton = V) {/** if it is a POST request, the request parameters are placed in the Request body, * name = % E6 % 88% 91 & age = 12 ***/stringbuilder Buf = new stringbuilder (); Buf. append ("name =" + urlencoder. encode (name. gettext (). tostring (), "UTF-8") + "&"); Buf. append ("age =" + urlencoder. encode (age. gettext (). tostring (), "UTF-8"); byte [] DATA = Buf. tostring (). getbytes ("UTF-8"); Url url = new URL ("http: // 192.168.0.103: 8080/Server/printservlet"); httpurlconnection conn = (httpurlconnection) URL. openconnection (); Conn. setrequestmethod ("Post"); Conn. setdooutput (true); // you must add outputstream out = conn to output data. getoutputstream (); out. write (data); If (Conn. getresponsecode () = 200) {toast. maketext (mainactivity. this, "Get submitted", toast. length_short ). show ();} else toast. maketext (mainactivity. this, "Get submission failed", toast. length_short ). show () ;}} catch (exception e) {}};@ overridepublic void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); name = (edittext) This. findviewbyid (R. id. name); age = (edittext) This. findviewbyid (R. id. age); getbutton = (button) This. findviewbyid (R. id. getbutton); postbutton = (button) This. findviewbyid (R. id. postbutton); getbutton. setonclicklistener (listener); postbutton. setonclicklistener (listener );}}