Use HttpURLConnection and HttpClient in Android to implement GET and POST requests to access the network

Use HttpURLConnection and HttpClient in Android to implement GET and POST requests to access the network
GET in HttpURLConnection

Import java. io. bufferedReader; import java. io. IOException; import java. io. inputStreamReader; import java. io. unsupportedEncodingException; import java.net. httpURLConnection; import java.net. malformedURLException; import java.net. URL; import java.net. URLEncoder; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. util. base64; import android. v Iew. view; import android. view. view. onClickListener; import android. widget. button; import android. widget. editText; import android. widget. textView; import android. widget. toast; public class MainActivity extends Activity {private EditText content; // declares the private Button button of the edit box object of the input text content; // declares a private Handler handler of the publish Button object; // declare a Handler object private String result = ""; // declare a String private TextView r that represents the displayed content EsultTV; // declare a text box object for Displaying results @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); content = (EditText) findViewById (R. id. content); // obtain the EditText component resultTV = (TextView) findViewById (R. id. result); // obtain the TextView component button = (Button) findViewById (R. id. button); // get the "publish" button component // Add and click the event listener button for the button. setOnClickListener (new O NClickListener () {@ Override public void onClick (View v) {if ("". equals (content. getText (). toString () {Toast. makeText (MainActivity. this, "Enter the content to be published! ", Toast. LENGTH_SHORT ). show (); // display the message prompt return;} // create a new Thread for sending and reading Weibo Information new Thread (new Runnable () {public void run () {send (); // send the text content to the Web server Message m = handler. obtainMessage (); // get a Message handler. sendMessage (m); // send message }}). start (); // enable thread}); // create a Handler Object handler = new Handler () {@ Override public void handleMessage (Message msg) {if (result! = Null) {resultTV. setText (result); // display the obtained content. setText (""); // clear the text box} super. handleMessage (msg) ;}};} public void send () {String target = ""; target = "http: // 192.168.1.66: 8081/blog/index. jsp? Content = "+ base64 (content. getText (). toString (). trim (); // URL of the URL to be accessed; try {url = new url (target); HttpURLConnection urlConn = (HttpURLConnection) URL. openConnection (); // create an HTTP connection InputStreamReader in = new InputStreamReader (urlConn. getInputStream (); // obtain the read content BufferedReader buffer = new BufferedReader (in); // obtain the input stream object String inputLine = null; // read the content of the input stream Row by loop while (inputLine = buffe R. readLine ())! = Null) {result + = inputLine + "\ n";} in. close (); // close the character input stream object urlConn. disconnect (); // disconnect} catch (MalformedURLException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace () ;}// encode the String with Base64 public String base64 (String content) {try {content = Base64.encodeToString (content. getBytes ("UTF-8"), Base64.DEFAULT); // base64-encoded string content = URLEncoder. encode (content); // encode the string by URL} catch (UnsupportedEncodingException e) {e. printStackTrace (); // output exception information} return content ;}}

POST in HttpURLConnection

Import java. io. bufferedReader; import java. io. dataOutputStream; import java. io. IOException; import java. io. inputStreamReader; import java.net. httpURLConnection; import java.net. malformedURLException; import java.net. URL; import java.net. URLEncoder; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. view. view; import android. view. view. onCli CkListener; import android. widget. button; import android. widget. editText; import android. widget. textView; import android. widget. toast; public class MainActivity extends Activity {private EditText nickname; // declares the private EditText content, the edit box object of an input nickname; // declare the private Button button of the edit box object of the input text; // declare the private Handler handler of the publish Button object; // declare a private String result = ""; // declare a private T string representing the displayed content ExtView resultTV; // declare a text box object for Displaying results @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); content = (EditText) findViewById (R. id. content); // obtain the EditText component resultTV = (TextView) findViewById (R. id. result); // obtain the TextView component nickname = (EditText) findViewById (R. id. nickname); // obtain the EditText component button = (Button) fi of the input nickname NdViewById (R. id. button); // get the "publish" button component // Add and click the event listener button for the button. setOnClickListener (new OnClickListener () {@ Override public void onClick (View v) {if ("". equals (nickname. getText (). toString () | "". equals (content. getText (). toString () {Toast. makeText (MainActivity. this, "Enter the complete content! ", Toast. LENGTH_SHORT ). show (); return;} // create a new Thread to obtain the file new Thread (new Runnable () {public void run () {send (); message m = handler. obtainMessage (); // get a Message handler. sendMessage (m); // send message }}). start (); // enable thread}); handler = new Handler () {@ Override public void handleMessage (Message msg) {if (result! = Null) {resultTV. setText (result); // display the obtained content. setText (""); // clear the content edit box nickname. setText (""); // clear the nickname editing box} super. handleMessage (msg) ;}};} public void send () {String target = "http: // 192.168.1.66: 8081/blog/dealPost. jsp "; // target URL url to be submitted; try {url = new URL (target); HttpURLConnection urlConn = (HttpURLConnection) url. openConnection (); // create an HTTP connection urlConn. setRequestMethod ("POST ");// Specify urlConn in POST request mode. setDoInput (true); // write data into the connection urlConn. setDoOutput (true); // reads data from the connection urlConn. setUseCaches (false); // disable caching urlConn. setInstanceFollowRedirects (true); // automatically executes the HTTP redirection urlConn. setRequestProperty ("Content-Type", "application/x-www-form-urlencoded"); // you can specify the Content Type DataOutputStream out = new DataOutputStream (urlConn. getOutputStream (); // get the output stream String param = "nickname =" + URLEncoder. enco De (nickname. getText (). toString (), "UTF-8") + "& content =" + URLEncoder. encode (content. getText (). toString (), "UTF-8"); // connects the data to be submitted out. writeBytes (param); // write the data to be passed into the data output stream out. flush (); // output cache out. close (); // close the data output stream // determine whether the response is successful if (urlConn. getResponseCode () = HttpURLConnection. HTTP_ OK) {InputStreamReader in = new InputStreamReader (urlConn. getInputStream (); // obtain the read content BufferedReader buffer = new Buff EredReader (in); // get the input stream object String inputLine = null; while (inputLine = buffer. readLine ())! = Null) {result + = inputLine + "\ n";} in. close (); // close the character input stream} urlConn. disconnect (); // disconnect} catch (MalformedURLException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}}}

HttpClient GET

The only difference between the Get method and the Get method in HttpURLConnection is the send method;

Public void send () {String target = "http: // 192.168.1.66: 8081/blog/deal_httpclient.jsp? Param = get "; // The target address to be submitted HttpClient httpclient = new DefaultHttpClient (); // create an HttpClient object HttpGet httpRequest = new HttpGet (target ); // create an HttpGet connection object HttpResponse httpResponse; try {httpResponse = httpclient.exe cute (httpRequest); // execute the HttpClient request if (httpResponse. getStatusLine (). getStatusCode () = HttpStatus. SC _ OK) {result = EntityUtils. toString (httpResponse. getEntity (); // get the returned string} else {result = "Request Failed! ";}} Catch (ClientProtocolException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}}

HttpClient POST

The send method is the same as the Post method in HttpURLConnection:

Public void send () {String target = "http: // 192.168.1.66: 8081/blog/deal_httpclient.jsp"; // The target address to be submitted: HttpClient httpclient = new DefaultHttpClient (); // create an HttpClient object HttpPost httpRequest = new HttpPost (target); // create an HttpPost object // Save the parameters to be passed to the List set
  
   
Params = new ArrayList
   
    
(); Params. add (new BasicNameValuePair ("param", "post"); // mark the parameter params. add (new BasicNameValuePair ("nickname", nickname. getText (). toString (); // nickname params. add (new BasicNameValuePair ("content", content. getText (). toString (); // content try {httpRequest. setEntity (new UrlEncodedFormEntity (params, "UTF-8"); // sets the encoding method HttpResponse httpResponse = httpclient.exe cute (httpRequest); // executes the HttpClient request if (httpResp Onse. getStatusLine (). getStatusCode () = HttpStatus. SC _ OK) {// if the request is successful, result + = EntityUtils. toString (httpResponse. getEntity (); // get the returned string} else {result = "the request failed! ";}} Catch (UnsupportedEncodingException e1) {e1.printStackTrace (); // output exception information} catch (ClientProtocolException e) {e. printStackTrace (); // output exception information} catch (IOException e) {e. printStackTrace (); // output exception information }}