android java.net.SocketException: Connection reset by peer

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写了个android上测试socket的例子：

server侧：

class ServerThread extends Thread {/** * TCP. */@Overridepublic void run() {ServerSocket serSocket = null;try {serSocket = new ServerSocket(4567);// wait until accept request from client !System.out.println("== before ServerSocket.accept(TCP) ==");Socket socket = serSocket.accept();InputStream is = socket.getInputStream();byte[] bytes = new byte[1024];int temp = 0;while ((temp = is.read(bytes)) != -1) {System.out.println(new String(bytes, 0, temp));}} catch (IOException e) {e.printStackTrace();} finally {try {serSocket.close();} catch (IOException e) {e.printStackTrace();}System.out.println("== after ServerSocket.accept(TCP) ==");}}}

client侧：

@Testpublic void startClientSocket() {Socket socket = null;InputStream is = null;try {// get socket objectsocket = new Socket("192.168.1.102", 4567);// get outputStreamOutputStream os = socket.getOutputStream();is = new FileInputStream("C:/test.txt");byte[] bytes = new byte[1024];int temp = 0;while ((temp = is.read(bytes)) != -1) {os.write(bytes, 0, temp);}os.flush();is.close();} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}

运行后发现logcat中有SocketException：

10-03 17:19:16.225: W/System.err(16398): java.net.SocketException: Connection reset by peer10-03 17:19:16.264: W/System.err(16398): at org.apache.harmony.luni.platform.OSNetworkSystem.read(Native Method)10-03 17:19:16.264: W/System.err(16398): at dalvik.system.BlockGuard$WrappedNetworkSystem.read(BlockGuard.java:273)10-03 17:19:16.264: W/System.err(16398): at org.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:458)10-03 17:19:16.264: W/System.err(16398): at org.apache.harmony.luni.net.SocketInputStream.read(SocketInputStream.java:85)10-03 17:19:16.264: W/System.err(16398): at org.apache.harmony.luni.net.SocketInputStream.read(SocketInputStream.java:65)10-03 17:19:16.272: W/System.err(16398): at com.example.androidstudy.socket.ServerThread.run(SocketActivity.java:54)

上网查了些资料，发现原因如下：
java.net.SocketException: （Connection reset或者Connect reset by peer:Socket write error）。

该异常在客户端和服务器端均有可能发生，引起该异常的原因有两个，第一个就是如果一端的Socket被关闭（或主动关闭或者因为异常退出而引起的关闭），另一端仍发送数据，发送的第一个数据包引发该异常(Connect reset by peer)。另一个是一端退出，但退出时并未关闭该连接，另一端如果在从连接中读数据则抛出该异常（Connection reset）。简单的说就是在连接断开后的读和写操作引起的。请参照：http://developer.51cto.com/art/201003/189724.htm

client侧的socket使用后没有关闭，所以在client侧的测试代码后面追加了finally，异常就不再发生了。

...... finally {try {socket.close();} catch (IOException e) {e.printStackTrace();}}