int类型

思路就是，

public void sendInt(int value){
    OutputStream os= null;  //这里是用socket的输出流，而不是用serversocket的
    try {
        os = socket.getOutputStream();
        int b24=(value>>24)&0xFF;
        int b16=(value>>16)&0xFF;
        int b8=(value>>8)&0xFF;
        int b0=(value>>0)&0xFF;
        os.write(b24);
        os.write(b16);
        os.write(b8);
        os.write(b0);
        os.flush();
        os.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void receiveInt(){
    int vel=0;
    try {
        InputStream is = client.getInputStream();
        int[] msg=new int[4];
        System.out.println("开始读消息:");
        for (int i=0;i<4;i++){
            msg[i]=is.read();
        }
        for (int i=0;i<4;i++){
            vel=vel+msg[i]<<(3-i)*8;
        }
        System.out.println(vel);
        client.close();
        is.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}