android socket客户端应用memo

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1 socket双向收发

发送因为不用阻塞，不用另开线程

接收线程

private class ReceiveThread extends Thread {    private InputStream inStream = null;        private byte[] buf;      private byte[] data;          ReceiveThread(Socket s)    {        try {            this.inStream = s.getInputStream();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }              @Override    public void run()    {        while(!stop)        {            buf = new byte[1024];                                    try {                //读取输入数据（阻塞）                int dataSize = this.inStream.read(buf);                if (dataSize > 0) {                data = ByteUtil.subBytes(buf, 0, dataSize);            Log.v("leo", "read data(" + data.length + "):" + ByteUtil.byte2hex(data));                          Message msg = new Message();            msg.what = MSG_DATARECEIVED;            msg.obj = this.data;            //发送消息            mHandler.sendMessage(msg);                }            }             catch (IOException e) { //socket断开                // TODO Auto-generated catch block                e.printStackTrace();            clientSocket = null;                        Message msg = new Message();            msg.what = MSG_SOCKETFAIL;            //发送消息            mHandler.sendMessage(msg);            return;            }                                 }    }}

2 通信协议

JavaStruct是处理协议格式的好工具，相当于在java中实现结构体，这样不用费劲拆装字节，定义好struct后，用pack和unpack就自动完成了。

// 包体LoginRequestBody body = new LoginRequestBody();deviceID = "1";String privateKey = "D8A2D5E2C1C6A5B800";System.arraycopy(deviceID.getBytes(), 0, body.deviceID, 0,deviceID.length());System.arraycopy(privateKey.getBytes(), 0, body.privateKey, 0,privateKey.length());body.lng = lng;body.lat = lat;body.v = 0;body.direction = -1;// 登录请求包LoginRequestPackage pkg = new LoginRequestPackage();pkg.bodyLength = body.getSize();pkg.body = body;byte[] bytes = null;try {bytes = JavaStruct.pack(pkg);} catch (StructException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}Log.v("leo", "login(" + bytes.length + "):" + ByteUtil.byte2hex(bytes));try {// 获得Socket的输出流OutputStream outStream = s.getOutputStream();// 发送数据outStream.write(bytes);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}

不过使用中发现javastruct定义的结构体之间好像不能继承，略有不爽

3 心跳包

用Repeating的Alarm，发Broadcast，在Receiver中发送心跳包

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