`
一夕剑
  • 浏览: 52935 次
  • 性别: Icon_minigender_1
  • 来自: 武汉
社区版块
存档分类
最新评论

[Android]正确地访问网络资源----Proxy的使用

阅读更多

天朝有很多独特的东西,今天要涉及到的是CMWAP与CMNET。

现在仍有许多Android手机用的是CMWAP连接网络的,如果只是简单滴使用URL.openConnection()开启一个HttpURLConnection,则会发现有一个UnknownHostException被抛出。唉...身为悲剧的程序员,就要开始解决这种bug了。

Sodino还发现一个现象,为什么自己的程序会崩掉,而Google浏览器就不会呢?与国产软件不同,国产软件身处天朝的软硬件环境下成长,可能会将代理IP(10.0.0.172)写进程序中,Sodino也确实反编译了几个程序后发现他们也是这样做来保持CMWAP下的正常联接。但是,Google浏览器可不是国人写的,那帮老外可不考虑天朝还有个CMWAP。那他们是如何保证网络的正常联接呢?一番鼓捣下,有了以下代码,可以在WIFI/CMWAP/CMNET/CTNET下正常访问网络,附带如何使用ping使用。

先上效果图:

 

view plaincopy to clipboardprint?
package lab.sodino.network;  
import java.io.IOException;  
import java.io.InputStream;  
import java.net.HttpURLConnection;  
import java.net.InetSocketAddress;  
import java.net.MalformedURLException;  
import java.net.URL;  
import java.net.UnknownHostException;  
import android.app.Activity;  
import android.content.Context;  
import android.net.ConnectivityManager;  
import android.net.NetworkInfo;  
import android.os.Bundle;  
import android.os.Handler;  
import android.os.Message;  
import android.util.Log;  
import android.view.View;  
import android.widget.Button;  
import android.widget.TextView;  
public class NetworkAct extends Activity {  
    public static final int CLEAR_TEXT = 0;  
    public static final int APPEND_TEXT = 1;  
    private TextView txtInfo;  
    private Button btnPing;  
    private Button btnConnect;  
    private Button btnClear;  
    private BtnListener btnListener;  
    private Handler handler = new Handler() {  
        public void handleMessage(Message msg) {  
            switch (msg.what) {  
            case APPEND_TEXT:  
                String content = msg.obj.toString();  
                txtInfo.setText("\n" + content);  
                break;  
            case CLEAR_TEXT:  
                txtInfo.setText("");  
                break;  
            }  
        }  
    };  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        btnListener = new BtnListener();  
        txtInfo = (TextView) findViewById(R.id.txtInfo);  
        btnPing = (Button) findViewById(R.id.btnPing);  
        btnPing.setOnClickListener(btnListener);  
        btnConnect = (Button) findViewById(R.id.btnConnect);  
        btnConnect.setOnClickListener(btnListener);  
        btnClear = (Button) findViewById(R.id.btnClear);  
        btnClear.setOnClickListener(btnListener);  
    }  
    /** 
     * @param param 
     *            指定的域名如(www.google.com)或IP地址。 
     */ 
    private void doPing(final String param) {  
        new Thread() {  
            public void run() {  
                String line = "";  
                InputStream is = null;  
                try {  
                    line = "\nping -c 1 " + param;  
                    // -c 1:表示ping的次数为1次。  
                    Process p = Runtime.getRuntime().exec("ping -c 1 www.google.com");  
                    // 等待该命令执行完毕。  
                    int status = p.waitFor();  
                    if (status == 0) {  
                        // 正常退出  
                        line += "Pass";  
                    } else {  
                        // 异常退出  
                        line += "Fail: Host unreachable";  
                    }  
                    is = p.getInputStream();  
                    byte[] data = new byte[is.available()];  
                    is.read(data);  
                    line += "\n" + new String(data);  
                } catch (UnknownHostException e) {  
                    line += "Fail: Unknown Host";  
                } catch (IOException e) {  
                    line += "Fail: IOException";  
                } catch (InterruptedException e) {  
                    line += "Fail: InterruptedException";  
                }  
                Message msg = new Message();  
                msg.what = APPEND_TEXT;  
                msg.obj = line;  
                handler.sendMessage(msg);  
            }  
        }.start();  
    }  
    private void go2Network() {  
        new Thread() {  
            public void run() {  
                String line = "";  
                URL url = null;  
                HttpURLConnection httpConn = null;  
                InputStream is = null;  
                try {  
                    url = new URL("http://www.sodino.com/index.html");  
                    // Log.d("ANDROID_LAB", "Protocol=" + new  
                    // URL("https://www.sodino.com").getProtocol());  
                    // 需要android.permission.ACCESS_NETWORK_STATE  
                    NetworkInfo networkInfo = ((ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE))  
                            .getActiveNetworkInfo();  
                    // 如果是使用的运营商网络  
                    if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {  
                        // 获取默认代理主机ip  
                        String host = android.net.Proxy.getDefaultHost();  
                        // 获取端口  
                        int port = android.net.Proxy.getDefaultPort();  
                        if (host != null && port != -1) {  
                            line += "\nhost[" + host + "] port[" + port + "]";  
                            // 封装代理連接主机IP与端口号。  
                            InetSocketAddress inetAddress = new InetSocketAddress(host, port);  
                            // 根据URL链接获取代理类型,本链接适用于TYPE.HTTP  
                            java.net.Proxy.Type proxyType = java.net.Proxy.Type.valueOf(url  
                                    .getProtocol().toUpperCase());  
                            java.net.Proxy javaProxy = new java.net.Proxy(proxyType, inetAddress);  
                            httpConn = (HttpURLConnection) url.openConnection(javaProxy);  
                        } else {  
                            httpConn = (HttpURLConnection) url.openConnection();  
                        }  
                    } else {  
                        httpConn = (HttpURLConnection) url.openConnection();  
                    }  
                    httpConn.connect();  
                    int length = httpConn.getContentLength();  
                    byte[] data = new byte[length];  
                    String encoding = httpConn.getContentEncoding();  
                    line += "\nlength=" + length + " encoding=" + encoding;  
                    is = httpConn.getInputStream();  
                    is.read(data);  
                    String content = null;  
                    if (encoding != null) {  
                        content = new String(data, encoding);  
                    } else {  
                        content = new String(data);  
                    }  
                    line += "\nContent[\n" + content + "\n]";  
                    Message msg = new Message();  
                    msg.what = APPEND_TEXT;  
                    msg.obj = line;  
                    handler.sendMessage(msg);  
                } catch (IOException ie) {  
                    ie.printStackTrace();  
                } finally {  
                    try {  
                        if (is != null) {  
                            is.close();  
                        }  
                        if (httpConn != null) {  
                            httpConn.disconnect();  
                        }  
                    } catch (IOException ie) {  
                        ie.printStackTrace();  
                    }  
                }  
            }  
        }.start();  
    }  
    class BtnListener implements Button.OnClickListener {  
        public void onClick(View view) {  
            if (view == btnPing) {  
                // doPing("www.google.com");  
                doPing("10.0.0.172");  
            } else if (view == btnConnect) {  
                go2Network();  
            } else if (view == btnClear) {  
                Message msg = new Message();  
                msg.what = CLEAR_TEXT;  
                handler.sendMessage(msg);  
            }  
        }  
    }  

package lab.sodino.network;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;
import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class NetworkAct extends Activity {
 public static final int CLEAR_TEXT = 0;
 public static final int APPEND_TEXT = 1;
 private TextView txtInfo;
 private Button btnPing;
 private Button btnConnect;
 private Button btnClear;
 private BtnListener btnListener;
 private Handler handler = new Handler() {
  public void handleMessage(Message msg) {
   switch (msg.what) {
   case APPEND_TEXT:
    String content = msg.obj.toString();
    txtInfo.setText("\n" + content);
    break;
   case CLEAR_TEXT:
    txtInfo.setText("");
    break;
   }
  }
 };
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  btnListener = new BtnListener();
  txtInfo = (TextView) findViewById(R.id.txtInfo);
  btnPing = (Button) findViewById(R.id.btnPing);
  btnPing.setOnClickListener(btnListener);
  btnConnect = (Button) findViewById(R.id.btnConnect);
  btnConnect.setOnClickListener(btnListener);
  btnClear = (Button) findViewById(R.id.btnClear);
  btnClear.setOnClickListener(btnListener);
 }
 /**
  * @param param
  *            指定的域名如(www.google.com)或IP地址。
  */
 private void doPing(final String param) {
  new Thread() {
   public void run() {
    String line = "";
    InputStream is = null;
    try {
     line = "\nping -c 1 " + param;
     // -c 1:表示ping的次数为1次。
     Process p = Runtime.getRuntime().exec("ping -c 1 www.google.com");
     // 等待该命令执行完毕。
     int status = p.waitFor();
     if (status == 0) {
      // 正常退出
      line += "Pass";
     } else {
      // 异常退出
      line += "Fail: Host unreachable";
     }
     is = p.getInputStream();
     byte[] data = new byte[is.available()];
     is.read(data);
     line += "\n" + new String(data);
    } catch (UnknownHostException e) {
     line += "Fail: Unknown Host";
    } catch (IOException e) {
     line += "Fail: IOException";
    } catch (InterruptedException e) {
     line += "Fail: InterruptedException";
    }
    Message msg = new Message();
    msg.what = APPEND_TEXT;
    msg.obj = line;
    handler.sendMessage(msg);
   }
  }.start();
 }
 private void go2Network() {
  new Thread() {
   public void run() {
    String line = "";
    URL url = null;
    HttpURLConnection httpConn = null;
    InputStream is = null;
    try {
     url = new URL("http://www.sodino.com/index.html");
     // Log.d("ANDROID_LAB", "Protocol=" + new
     // URL("https://www.sodino.com").getProtocol());
     // 需要android.permission.ACCESS_NETWORK_STATE
     NetworkInfo networkInfo = ((ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE))
       .getActiveNetworkInfo();
     // 如果是使用的运营商网络
     if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
      // 获取默认代理主机ip
      String host = android.net.Proxy.getDefaultHost();
      // 获取端口
      int port = android.net.Proxy.getDefaultPort();
      if (host != null && port != -1) {
       line += "\nhost[" + host + "] port[" + port + "]";
       // 封装代理連接主机IP与端口号。
       InetSocketAddress inetAddress = new InetSocketAddress(host, port);
       // 根据URL链接获取代理类型,本链接适用于TYPE.HTTP
       java.net.Proxy.Type proxyType = java.net.Proxy.Type.valueOf(url
         .getProtocol().toUpperCase());
       java.net.Proxy javaProxy = new java.net.Proxy(proxyType, inetAddress);
       httpConn = (HttpURLConnection) url.openConnection(javaProxy);
      } else {
       httpConn = (HttpURLConnection) url.openConnection();
      }
     } else {
      httpConn = (HttpURLConnection) url.openConnection();
     }
     httpConn.connect();
     int length = httpConn.getContentLength();
     byte[] data = new byte[length];
     String encoding = httpConn.getContentEncoding();
     line += "\nlength=" + length + " encoding=" + encoding;
     is = httpConn.getInputStream();
     is.read(data);
     String content = null;
     if (encoding != null) {
      content = new String(data, encoding);
     } else {
      content = new String(data);
     }
     line += "\nContent[\n" + content + "\n]";
     Message msg = new Message();
     msg.what = APPEND_TEXT;
     msg.obj = line;
     handler.sendMessage(msg);
    } catch (IOException ie) {
     ie.printStackTrace();
    } finally {
     try {
      if (is != null) {
       is.close();
      }
      if (httpConn != null) {
       httpConn.disconnect();
      }
     } catch (IOException ie) {
      ie.printStackTrace();
     }
    }
   }
  }.start();
 }
 class BtnListener implements Button.OnClickListener {
  public void onClick(View view) {
   if (view == btnPing) {
    // doPing("www.google.com");
    doPing("10.0.0.172");
   } else if (view == btnConnect) {
    go2Network();
   } else if (view == btnClear) {
    Message msg = new Message();
    msg.what = CLEAR_TEXT;
    handler.sendMessage(msg);
   }
  }
 }
}

如此,悲剧的程序员解决了不同网络状态下如何保证正常链接的问题。

最后补充下:Android手机在CMWAP上要能够正常上网,除了设置一大堆代理数据外,还需进入拨号器下按"*#*#4636#*#*"→Phone Information下拉到最后后有个“Toggle DNS Check”,将其设置为allow

转载自:http://blog.csdn.net/sodino/archive/2011/04/05/6302313.aspx

分享到:
评论

相关推荐

    Java资源包01

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包1

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包10

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包2

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    JAVA上百实例源码以及开源项目源代码

    (1)提高文件的共享性(计算机程序和/或数据),(2)鼓励间接地(通过程序)使用远程计算机,(3)保护用户因主机之间的文件存储系统导致的变化,(4)为了可靠和高效地传输,虽然用户可以在终端上直接地使用它,...

    java开源包8

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    JAVA上百实例源码以及开源项目

    (1)提高文件的共享性(计算机程序和/或数据),(2)鼓励间接地(通过程序)使用远程计算机,(3)保护用户因主机之间的文件存储系统导致的变化,(4)为了可靠和高效地传输,虽然用户可以在终端上直接地使用它,...

    java开源包11

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包3

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包6

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包5

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包4

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包7

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包9

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

    java开源包101

    开发它是用于在UTF-8 Oracle实例中使用ASCII编码的Oracle 数据库中来正确的传输非ASCII字符。 Java模板语言 Beetl Beetl,是Bee Template Language的缩写,它绝不是简单的另外一种模板引擎,而是新一代的模板引擎,...

Global site tag (gtag.js) - Google Analytics