bundle开发----Socket通讯(Client）

   上篇记录了作为Server端bundle的实现，本文看看作为Client端如何实现一个bundle，代码改动的地方很小。

先来看看WifiBundle.java，代码如下(远程服务器地址为：192.168.0.1，端口号为：16384)：

    package demo.wifi.bundle;            import java.io.IOException;        import java.net.SocketAddress;      import java.net.InetSocketAddress;      import java.util.logging.Level;      import java.util.logging.Logger;      import java.nio.ByteBuffer;      import java.nio.channels.SocketChannel;      import java.nio.channels.ServerSocketChannel;      import org.osgi.framework.BundleContext;      import java.nio.channels.NotYetConnectedException;                  public class WifiBundle {                    public static BundleContext bc = null;          private final static Logger logger = Logger.getLogger(WifiBundle.class.getName());            public volatile static SocketChannel socketChannel = null;                     public static ServerSocketChannel serverSocketChannel;                    public static boolean wifiRunningFlag = false;          public static boolean wifiConnectionError = false;                public static class WifiRunable implements  Runnable {                              int totalSize = 0;              int leftSize = 0;              static String eventTopic = null;              int arrayPosition = 0;              boolean rtn;              ByteBuffer receiveBuffer = ByteBuffer.allocateDirect(1024);                            public void run() {                try {                   // Socket connection                   socketChannel = SocketChannel.open();                     SocketAddress socketAddress = new InetSocketAddress("192.168.0.1", 16384);                                                     if(!socketChannel.connect(socketAddress)) {                       System.out.println("Wifi connection failed!");                    } else {                       System.out.println("Wifi connection OK!");                   }                                              while (wifiRunningFlag) {                         receiveBuffer.clear();                         rtn = receivePackage(receiveBuffer, 128);                           if(!rtn) {                            receiveBuffer.clear();                            break;                         }                         receiveBuffer.clear();                           sendPackage(receiveBuffer);                                              receiveBuffer.clear();                     }                                  } catch (Exception ex) {                    logger.log(Level.SEVERE, null, ex);                        }             finally {                try {                    socketChannel.close();                    socketChannel = null;                    System.out.println("socketChannle closed!\n");                } catch(Exception ex) {                    return;                }                }        }            }                         public static void sendPackage(ByteBuffer buffer) throws IOException {                try {                  socketChannel.write(buffer);              } catch(IOException ex) {                ex.printStackTrace();                System.out.println("error occured in sendPackage()!");                wifiConnectionError = true;                return;              }              return;          }                          public static boolean receivePackage(ByteBuffer byteBuffer, int size) throws IOException {                            int arrayPos = 0;              int tempSize ;              int leftSize = size;              int totalSize = size;              byte[] tempByteArray = new byte[totalSize];               ByteBuffer tempBuffer = ByteBuffer.allocateDirect(1);                            while((leftSize > 0) && (wifiRunningFlag == true))  {                  try {                      while(((tempSize = socketChannel.read(tempBuffer)) != -1)  && (wifiRunningFlag == true) ) {                               tempBuffer.flip();                          if (tempSize == 0) {                              continue;                          } else {                              tempBuffer.get(tempByteArray, arrayPos, tempSize);                              leftSize --;                              arrayPos ++;                              if(leftSize == 0) {                                  break;                              }                          }                         }                       } catch (IOException ex) {                      ex.printStackTrace();                      System.out.println("error occured in receivePackage()!");                      wifiConnectionError = true;                      return false;                  }                                }                            byteBuffer.put(tempByteArray, 0, size);                            return true;              }                        }     

再来看看Activator.java，代码比较简单，只需在start和stop函数中分别开始和终止socket收发进程。

    package demo.wifi.bundle;            import org.osgi.framework.BundleActivator;      import org.osgi.framework.BundleContext;      import demo.wifi.bundle.WifiBundle.WifiRunable;      import demo.wifi.bundle.WifiBundle;                  public class Activator implements BundleActivator {                        public void start(BundleContext context) throws Exception {                        System.out.println("wifi bundle started!");              WifiEventPublisher.bc = context;            WifiEventPublisher.eventRegister();                              //start Wifi new thread            new Thread(new WifiRunable()).start();            WifiBundle.wifiRunningFlag = true;        }              public void stop(BundleContext context) throws Exception {            WifiBundle.wifiRunningFlag = false;            WifiEventPublisher.EventUnregister();            if(WifiBundle.socketChannel.isConnected()) {                WifiBundle.socketChannel.close();            }            System.out.println("wifi bundle stoped!");        }      }