Html code viewer, code Viewer

Html code viewer, code Viewer
Html code Viewer

Effect:

 

Analysis:

1. permissions required to connect to the network

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

2. Write the default protocol and default ports http and 80

3. Put the network access code in AsyncTask.

4. Two methods for obtaining content types

String contentType = conn. getHeaderField ("Content-Type ");

Conn. getContentType

5. Split Functions

String encoding = contentType. split ("=") [0];

Divide by equal signs, and take 0th segments

 

 

Code:

1 package fry; 2 3 import java. io. inputStreamReader; 4 import java.net. httpURLConnection; 5 import java.net. malformedURLException; 6 import java.net. URL; 7 8 import com. example. watchCode. r; 9 10 import android. app. activity; 11 import android. OS. asyncTask; 12 import android. OS. bundle; 13 import android. util. log; 14 import android. view. view; 15 import android. widget. button; 16 import android. widget. editTex T; 17 18 public class Activity01 extends Activity {19 private Button btn_checked; 20 private EditText et_webSite; 21 private EditText et_content; 22 @ Override23 protected void onCreate (Bundle savedInstanceState) {24 // TODO Auto-generated method stub25 super. onCreate (savedInstanceState); 26 setContentView (R. layout. activity01); 27 28 btn_checked = (Button) findViewById (R. id. btn_checked); 29 et_webSite = (EditT Ext) findViewById (R. id. et_webSite); 30 et_content = (EditText) findViewById (R. id. et_content); 31 32} 33 34 35 public void onClick (View view) {36 // obtain the URL 37 String urlStr = et_webSite.getText () entered in the edit box (). toString (); 38 new AsyncTask <String, Void, String> () {39 40 @ Override41 protected String doInBackground (String... arg0) {42 // String buffer 43 StringBuffer buffer = new StringBuffer (); 44 try {45 String s = arg0 [0] + ": 80"; 46 // Encapsulate URL object 47 URL url = new URL (s); 48 // GET http connection object 49 HttpURLConnection conn = (HttpURLConnection) url. openConnection (); 50 conn. setRequestMethod ("GET"); 51 conn. setConnectTimeout (5000); 52 // get status code 53 int code = conn. getResponseCode (); 54 Log. d ("fry", "Get Status code:" + code); 55 if (code = 200) {// request successful 56 String contentType = conn. getHeaderField ("Content-Type"); 57 String encoding = contentType. split ("=") [0]; 58 Log. d ("fry", encod Ing); 59 // obtain the object content of the Response Message 60 InputStreamReader reader = new InputStreamReader (conn. getInputStream (), "UTF-8"); 61 char [] charArr = new char [1024*8]; 62 int len = 0; 63 while (len = reader. read (charArr ))! =-1) {64 // character array to String 65 String str = new String (charArr, 0, len); 66 // append String 67 buffer at the end. append (str); 68} 69} 70 71} catch (Exception e) {72 e. printStackTrace (); 73} 74 75 return buffer. toString (); 76} 77 protected void onPostExecute (String result) {78 // set the String to the edit box 79 et_content.setText (result); 80 81 }; 82 83. cmd.exe cute ("http: //" + urlStr); 84} 85 86}

 

Originally, getResponseCode connected and obtained status codes, and returned status codes.

Now conn. connect () Does the connection.

 

If the connection fails for MS, an exception is thrown.