android中的网络通信

    1、HttpURLConnection

    

 
  package 
   com.test;

 
  import 
   java.io.BufferedReader;
 
  import 
   java.io.IOException;
 
  import 
   java.io.InputStreamReader;
 
  import 
   java.net.HttpURLConnection;
 
  import 
   java.net.MalformedURLException;
 
  import 
   java.net.URL;

 
  import 
   android.app.Activity;
 
  import 
   android.content.Intent;
 
  import 
   android.os.Bundle;
 
  import 
   android.os.Handler;
 
  import 
   android.os.Message;
 
  import 
   android.util.Log;
 
  import 
   android.view.View;
 
  import 
   android.view.View.OnClickListener;
 
  import 
   android.widget.Button;
 
  import 
   android.widget.TextView;

 
  public 
  class 
   Activity01  
  extends 
   Activity {
 
  private 
  final 
   String DEBUG_TAG  
  = 
  " 
  Activity02 
  " 
  ;
 
  private 
   TextView mTextView;
 
  private 
   Button mButton;
 
  private 
   Button mButton1;
 
  /** 
   Called when the activity is first created.  
  */ 
  
 @Override
 
  public 
  void 
   onCreate(Bundle savedInstanceState) {
 
  super 
  .onCreate(savedInstanceState);
 setContentView(R.layout.main);
 mTextView  
  = 
   (TextView) findViewById(R.id.Textview01);
 mButton  
  = 
   (Button) findViewById(R.id.Button01);
 mButton1 
  = 
  (Button) findViewById(R.id.Button02);
 mButton.setOnClickListener( 
  new 
   OnClickListener() {

 @Override
 
  public 
  void 
   onClick(View v) {
 
  // 
   TODO Auto-generated method stub 
  
 
   refresh();
 }
 });
 mButton1.setOnClickListener( 
  new 
   OnClickListener() {

 @Override
 
  public 
  void 
   onClick(View v) {
 
  // 
   TODO Auto-generated method stub 
  
 
   Intent intent 
  = 
  new 
   Intent();
 intent.setClass(Activity01. 
  this 
  , Activity02. 
  class 
  );
 startActivity(intent);
 Activity01. 
  this 
  .finish();
 }
 });
 
  // 
   开启线程 
  
 
  new 
   Thread(mRunnable).start();
 }

 
  private 
  void 
   refresh() {
 
  // 
   TODO Auto-generated method stub 
  
 
   String httpURL  
  = 
  " 
  http://wap.baidu.com/ 
  " 
  ;
 String resultData  
  = 
  "" 
  ;
 URL url  
  = 
  null 
  ;
 
  try 
   {
 url  
  = 
  new 
   URL(httpURL);
 }  
  catch 
   (MalformedURLException e) {
 
  // 
   TODO Auto-generated catch block 
  
 
   Log.e(DEBUG_TAG,  
  " 
  MalformedURLException 
  " 
  );
 }
 
  if 
   (url  
  != 
  null 
  ) {
 
  try 
   {
 
  // 
   使用HttpURLConnection打开连接 
  
 
   HttpURLConnection urlConn  
  = 
   (HttpURLConnection) url
 .openConnection();
 
  // 
   得到读取的数据流 
  
 
   InputStreamReader in  
  = 
  new 
   InputStreamReader(urlConn
 .getInputStream());
 
  // 
   为输出创建BufferedReader 
  
 
   BufferedReader buffer  
  = 
  new 
   BufferedReader(in);
 String inputLine  
  = 
  null 
  ;
 
  // 
   使用循环来读取获得的数据 
  
 
  while 
   ((inputLine  
  = 
   buffer.readLine())  
  != 
  null 
  ) {
 
  // 
   我们在每一行后面加一个换行符"\n" 
  
 
   resultData  
  += 
   inputLine  
  + 
  " 
  \n 
  " 
  ;
 }
 
  // 
   关闭InputStreamReader 
  
 
   in.close();
 
  // 
   关闭连接 
  
 
   urlConn.disconnect();
 
  // 
   设置显示取得的内容 
  
 
  if 
   (resultData  
  != 
  null 
  ) {
 mTextView.setText(resultData);
 }  
  else 
   {
 mTextView.setText( 
  " 
  读取的内容为Null 
  " 
  );
 }

 }  
  catch 
   (IOException e) {
 
  // 
   TODO Auto-generated catch block 
  
 
   Log.e(DEBUG_TAG,  
  " 
  IOException 
  " 
  );
 }
 }  
  else 
   {
 Log.e(DEBUG_TAG,  
  " 
  url Null 
  " 
  );
 }
 }

 
  private 
   Runnable mRunnable  
  = 
  new 
   Runnable() {

 @Override
 
  public 
  void 
   run() {
 
  // 
   TODO Auto-generated method stub 
  
 
  while 
   ( 
  true 
  ) {
 
  try 
   {
 Thread.sleep( 
  5000 
  );
 
  // 
   发送消息 
  
 
   mHandler.sendMessage(mHandler.obtainMessage());
 }  
  catch 
   (InterruptedException e) {
 
  // 
   TODO Auto-generated catch block 
  
 
   Log.e(DEBUG_TAG, e.toString());
 }
 }
 }
 };

 Handler mHandler  
  = 
  new 
   Handler() {

 @Override
 
  public 
  void 
   handleMessage(Message msg) {
 
  // 
   TODO Auto-generated method stub 
  
 
  super 
  .handleMessage(msg);
 
  // 
   刷新 
  
 
   refresh();
 }

 };
} 
 

2、java.net.URL

 
  package 
   com.test;

 
  import 
   java.io.BufferedReader;
 
  import 
   java.io.IOException;
 
  import 
   java.io.InputStreamReader;
 
  import 
   java.net.HttpURLConnection;
 
  import 
   java.net.MalformedURLException;
 
  import 
   java.net.URL;

 
  import 
   android.app.Activity;
 
  import 
   android.content.Intent;
 
  import 
   android.os.Bundle;
 
  import 
   android.util.Log;
 
  import 
   android.view.View;
 
  import 
   android.view.View.OnClickListener;
 
  import 
   android.widget.Button;
 
  import 
   android.widget.TextView;

 
  public 
  class 
   Activity02  
  extends 
   Activity{
 
  private 
  final 
   String DEBUG_TAG  
  = 
  " 
  Activity02 
  " 
  ;
 @Override
 
  protected 
  void 
   onCreate(Bundle savedInstanceState) {
 
  // 
   TODO Auto-generated method stub 
  
 
  super 
  .onCreate(savedInstanceState);
 setContentView(R.layout.http);
 TextView mTextView 
  = 
  (TextView) findViewById(R.id.TextView_HTTP);
 
  // 
  http地址 
  
 
   String httpURL  
  = 
  " 
  http://www.huohu123.com/?src=ffbookmark 
  " 
  ;
 
  // 
  获得的数据 
  
 
   String resultData  
  = 
  "" 
  ;
 URL url  
  = 
  null 
  ;
 
  try 
   {
 url  
  = 
  new 
   URL(httpURL);
 }  
  catch 
   (MalformedURLException e) {
 
  // 
   TODO Auto-generated catch block 
  
 
   Log.e(DEBUG_TAG,  
  " 
  MalformedURLException 
  " 
  );
 }
 
  if 
   (url  
  != 
  null 
  ) {
 
  try 
   {
 
  // 
   使用HttpURLConnection打开连接 
  
 
   HttpURLConnection urlConn  
  = 
   (HttpURLConnection) url
 .openConnection();
 
  // 
   得到读取的数据流 
  
 
   InputStreamReader in  
  = 
  new 
   InputStreamReader(urlConn
 .getInputStream());
 
  // 
   为输出创建BufferedReader 
  
 
   BufferedReader buffer  
  = 
  new 
   BufferedReader(in);
 String inputLine  
  = 
  null 
  ;
 
  // 
   使用循环来读取获得的数据 
  
 
  while 
   ((inputLine  
  = 
   buffer.readLine())  
  != 
  null 
  ) {
 
  // 
   我们在每一行后面加一个换行符"\n" 
  
 
   resultData  
  += 
   inputLine  
  + 
  " 
  \n 
  " 
  ;
 }
 
  // 
   关闭InputStreamReader 
  
 
   in.close();
 
  // 
   关闭连接 
  
 
   urlConn.disconnect();
 
  // 
   设置显示取得的内容 
  
 
  if 
   (resultData  
  != 
  null 
  ) {
 mTextView.setText(resultData);
 }  
  else 
   {
 mTextView.setText( 
  " 
  读取的内容为Null 
  " 
  );
 }

 }  
  catch 
   (IOException e) {
 
  // 
   TODO Auto-generated catch block 
  
 
   Log.e(DEBUG_TAG,  
  " 
  IOException 
  " 
  );
 }
 }  
  else 
   {
 Log.e(DEBUG_TAG,  
  " 
  url Null 
  " 
  );
 }
 Button mButton 
  = 
  (Button) findViewById(R.id.Button_Back);
 mButton.setOnClickListener( 
  new 
   OnClickListener() {

 @Override
 
  public 
  void 
   onClick(View v) {
 
  // 
   TODO Auto-generated method stub 
  
 
   Intent intent 
  = 
  new 
   Intent();
 intent.setClass(Activity02. 
  this 
  , Activity01. 
  class 
  );
 startActivity(intent);
 Activity02. 
  this 
  .finish();
 }
 });
 }

} 
 

 

3、以Get方式

 
  package 
   com.test;

 
  import 
   java.io.BufferedReader;
 
  import 
   java.io.IOException;
 
  import 
   java.io.InputStreamReader;
 
  import 
   java.net.HttpURLConnection;
 
  import 
   java.net.MalformedURLException;
 
  import 
   java.net.URL;

 
  import 
   android.app.Activity;
 
  import 
   android.content.Intent;
 
  import 
   android.os.Bundle;
 
  import 
   android.util.Log;
 
  import 
   android.view.View;
 
  import 
   android.view.View.OnClickListener;
 
  import 
   android.widget.Button;
 
  import 
   android.widget.TextView;

 
  public 
  class 
   Activity03  
  extends 
   Activity {
 
  private 
  final 
   String DEBUG_TAG  
  = 
  " 
  Activity03 
  " 
  ;
 @Override
 
  protected 
  void 
   onCreate(Bundle savedInstanceState) {
 
  // 
   TODO Auto-generated method stub 
  
 
  super 
  .onCreate(savedInstanceState);
 setContentView(R.layout.http);
 TextView mTextView 
  = 
  (TextView) findViewById(R.id.TextView_HTTP);
 
  // 
  http地址 
  
 
   String httpURL  
  = 
  " 
  http://localhost:8080/bbb/list.jsp 
  " 
  ;
 
  // 
  获得的数据 
  
 
   String resultData  
  = 
  "" 
  ;
 URL url  
  = 
  null 
  ;
 
  try 
   {
 url  
  = 
  new 
   URL(httpURL);
 }  
  catch 
   (MalformedURLException e) {
 
  // 
   TODO Auto-generated catch block 
  
 
   Log.e(DEBUG_TAG,  
  " 
  MalformedURLException 
  " 
  );
 }
 
  if 
   (url  
  != 
  null 
  ) {
 
  try 
   {
 
  // 
   使用HttpURLConnection打开连接 
  
 
   HttpURLConnection urlConn  
  = 
   (HttpURLConnection) url
 .openConnection();
 
  // 
   得到读取的数据流 
  
 
   InputStreamReader in  
  = 
  new 
   InputStreamReader(urlConn
 .getInputStream());
 
  // 
   为输出创建BufferedReader 
  
 
   BufferedReader buffer  
  = 
  new 
   BufferedReader(in);
 String inputLine  
  = 
  null 
  ;
 
  // 
   使用循环来读取获得的数据 
  
 
  while 
   ((inputLine  
  = 
   buffer.readLine())  
  != 
  null 
  ) {
 
  // 
   我们在每一行后面加一个换行符"\n" 
  
 
   resultData  
  += 
   inputLine  
  + 
  " 
  \n 
  " 
  ;
 }
 
  // 
   关闭InputStreamReader 
  
 
   in.close();
 
  // 
   关闭连接 
  
 
   urlConn.disconnect();
 
  // 
   设置显示取得的内容 
  
 
  if 
   (resultData  
  != 
  null 
  ) {
 mTextView.setText(resultData);
 }  
  else 
   {
 mTextView.setText( 
  " 
  读取的内容为Null 
  " 
  );
 }

 }  
  catch 
   (IOException e) {
 
  // 
   TODO Auto-generated catch block 
  
 
   Log.e(DEBUG_TAG,  
  " 
  IOException 
  " 
  );
 }
 }  
  else 
   {
 Log.e(DEBUG_TAG,  
  " 
  url Null 
  " 
  );
 }
 Button mButton 
  = 
  (Button) findViewById(R.id.Button_Back);
 mButton.setOnClickListener( 
  new 
   OnClickListener() {

 @Override
 
  public 
  void 
   onClick(View v) {
 
  // 
   TODO Auto-generated method stub 
  
 
   Intent intent 
  = 
  new 
   Intent();
 intent.setClass(Activity03. 
  this 
  , Activity01. 
  class 
  );
 startActivity(intent);
 Activity03. 
  this 
  .finish();
 }
 });
 }
} 
 

节选自：eoe特刊！