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;

publicclass Activity01 extends Activity {
 privatefinal String DEBUG_TAG ="Activity02";
 private TextView mTextView;
 private Button mButton;
 private Button mButton1;
 /** Called when the activity is first created. */
 @Override
 publicvoid 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
 publicvoid onClick(View v) {
 // TODO Auto-generated method stub
 refresh();
 }
 });
 mButton1.setOnClickListener(new OnClickListener() {
 
 @Override
 publicvoid 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();
 }

 privatevoid 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
 publicvoid 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
 publicvoid 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;

publicclass Activity02 extends Activity{
 privatefinal String DEBUG_TAG ="Activity02";
 @Override
 protectedvoid 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
 publicvoid 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;

publicclass Activity03 extends Activity {
 privatefinal String DEBUG_TAG ="Activity03";
 @Override
 protectedvoid 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
 publicvoid 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！