Android communication HttpClient

Android communication HttpClient

The following is a small example of using HttpClient to log on to the server.

Package com. liang. logindemo; import android. OS. bundle; import android. support. v7.app. actionBarActivity; import android. view. view; import android. widget. editText; import android. widget. toast; import org. apache. http. httpResponse; import org. apache. http. nameValuePair; import org. apache. http. client. httpClient; import org. apache. http. client. entity. urlEncodedFormEntity; import org. apache. http. client. methods. httpGe T; import org. apache. http. client. methods. httpPost; import org. apache. http. entity. bufferedHttpEntity; import org. apache. http. impl. client. defaultHttpClient; import org. apache. http. message. basicNameValuePair; import java. io. bufferedReader; import java. io. inputStream; import java. io. inputStreamReader; import java. io. outputStream; import java. io. reader; import java. io. stringReader; import java. io. unsupportedEncod IngException; import java.net. httpURLConnection; import java.net. URL; import java.net. URLEncoder; import java. util. arrayList; import java. util. list; public class MainActivity3 extends ActionBarActivity {private EditText et_userName; private EditText et_password; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); et _ UserName = (EditText) findViewById (R. id. et_userName); et_password = (EditText) findViewById (R. id. et_password);} public void login (View view) {String str = et_userName.getText (). toString (); try {str = URLEncoder. encode (str, "UTF-8");} catch (UnsupportedEncodingException e) {e. printStackTrace ();} final String userName = str; final String password = et_password.getText (). toString (); // access the network new Thread in the Child Thread (New Runnable () {@ Override public void run () {try {final boolean isSuccess = loginByPost (userName, password); // final boolean isSuccess = loginByGet (userName, password ); // you do not need to use Handler to notify the main thread to use this method. The main thread completes runOnUiThread (new Runnable () {@ Override public void run () {if (isSuccess) {Toast. makeText (MainActivity3.this, "succeeded !!! ", Toast. LENGTH_SHORT). show ();} else {Toast. makeText (MainActivity3.this," failed !!! ", Toast. LENGTH_SHORT ). show () ;}}) ;}catch (Exception e) {e. printStackTrace ();}}}). start ();}/*** HttpClient accesses the server through a GET request * @ param userName, password * @ return * @ throws Exception */private Boolean loginByGet (String userName, string password) throws Exception {// server address String url = "http: // 192.168.1.140: 8080/Login/servlet/Login"; String data = "? UserName = "+ userName +" & password = "+ password; HttpClient client = null; // define a client = new DefaultHttpClient (); // define a get request HttpGet = new HttpGet (url + data); // execute the get request to obtain the response object HttpResponse response = client.exe cute (get ); // get the response status code int code = response. getStatusLine (). getStatusCode (); // return result if (code = 200) {// get response content InputStream is = response. getEntity (). getContent (); BufferedReader reader = new Bu FferedReader (new InputStreamReader (is); String text = reader. readLine (); reader. close (); is. close (); return "SUCCESS". equals (text )? True: false;} if (client! = Null) {// close the connection to the client. getConnectionManager (). shutdown ();} return false ;} /*** HttpClient accesses the server through POST Request * @ param userName * @ param password * @ return * @ throws Exception */boolean loginByPost (String userName, String password) throws Exception {// server address String url = "http: // 192.168.1.140: 8080/Login/servlet/Login"; HttpClient client = null; // define a client = new DefaultHttpClient (); // define a Post request HttpPost post = new HttpPost (url); // set the request data List
 
  
List = new ArrayList
  
   
(); List. add (new BasicNameValuePair ("userName", userName); list. add (new BasicNameValuePair ("password", password); UrlEncodedFormEntity entity = new UrlEncodedFormEntity (list); post. setEntity (entity); // execute the get request to obtain the response object HttpResponse response = client.exe cute (post); // obtain the response status code int code = response. getStatusLine (). getStatusCode (); // return result if (code = 200) {// get response content InputStream is = response. getEntity (). getCo Ntent (); BufferedReader reader = new BufferedReader (new InputStreamReader (is); String text = reader. readLine (); reader. close (); is. close (); return "SUCCESS ". equals (text )? True: false;} if (client! = Null) {// close the Connection client. getConnectionManager (). shutdown () ;}return false ;}}
  
 

You need to add network access permissions to the configuration file.