Android Learning (50)--submit data using Post

Important Post submission data is two more properties in the protocol header that is written to the server by the stream Content-type: application/x-www-form-urlencoded, describing the mimetype of submitted data
Content-length: 30, describing the length of the submitted data

Add post extra two properties to the request header string data = "Name=" + urlencoder.encode (name) + "&pass=" + pass;conn.setrequestproperty (" Content-type "," application/x-www-form-urlencoded "); Conn.setrequestproperty (" Content-length ", data.length () +" ");

set the stream that allows the post request to be opened

Conn.setdooutput (TRUE);

gets the output stream of the connection object, writes the data to be submitted to the server in the stream

OutputStream OS = Conn.getoutputstream (); Os.write (Data.getbytes ());

Core code

public class Mainactivity extends Activity {@Overrideprotected void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main);} Handler Handler = new Handler () {public void Handlemessage (Android.os.Message msg) {Toast.maketext (Mainactivity.this, ( String) msg.obj, 0). Show ();}}; public void Click (View v) {EditText et_name = (EditText) Findviewbyid (r.id.et_name); EditText Et_pass = (EditText) Findviewbyid (R.id.et_pass); final String name = Et_name.gettext (). toString (); final string pass = Et_pass.gettext (). toString (); Thread t = new Thread () {@Overridepublic void Run () {//Submitted data needs to be URL encoded, English and digitally encoded unchanged @suppresswarnings ("deprecation") String Path = "Http://192.168.13.13/Web2/servlet/LoginServlet"; try {URL url = new URL (path); HttpURLConnection conn = (httpurlconnection) url.openconnection (); Conn.setrequestmethod ("POST"); Conn.setconnecttimeout (Conn.setreadtimeout (5000);//String data = "Name=" + urlencoder.encode ( Name) + "&pass=" + Pass;//add two lines of the POST request Property Conn.setrequestproperty ("Content-type", "application/x-www-form-urlencoded"); Conn.setrequestproperty ("Content-length", data.length () + "");//set Open output stream Conn.setdooutput (true);//Get output stream OutputStream OS = Conn.getoutputstream ();//Use the output stream to submit data to the server Os.write (Data.getbytes ()); if (conn.getresponsecode () = =) {InputStream is = Conn.getinputstream (); String Text = Utils.gettextfromstream (IS); Message msg = Handler.obtainmessage (); msg.obj = Text;handler.sendmessage (msg);}} catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();}}; T.start ();}}

Gettextfromstream

public static String Gettextfromstream (InputStream is) {byte[] b = new Byte[1024];int Len = 0;//creates a byte array output stream, reads the text data of the input stream, synchronizes the number Writes an array output stream bytearrayoutputstream Bos = new Bytearrayoutputstream (); try {while (len = Is.read (b))! =-1) {bos.write (b, 0, Len) ;} Converts the data in the byte array output stream into a byte array, string text = new String (Bos.tobytearray ()); return text;} catch (IOException e) {e.printstacktrace ();} return null;}

Android Learning (50)--submit data using Post