Android:使用Socket网络通信时异常:java.net.SocketException: socket closed
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现象:
笔者在学习使用Socket进行通信时,在服务器端遇到了如下异常:
java.net.SocketException: socket closed
本质:
当两个socket对象进行通信的时候,首先会在服务器端和客户端建立两个socket对象,用以获得虚拟链路的输入、输出流,如:
ServerSocket serverSocket = new ServerSocket(PORT);
Socket socket = serverSocket.accept();
这样的话就拿到了Socket对象,把Socket对象当做参数传给Thread类的构造器,便可以实现多线程的网络通讯了,但是在Thread类中定义I/O流的时候,笔者将BufferedWriter对象的引用和创建分开来写了,如:
private BufferedWriter bw = null;
@Override
public void run() {
try {
bw = new BufferedWriter(
new OutputStreamWriter(
socket.getOutputStream(), "UTF-8"));
}
......
}
这样做虽然bw对象可以在该类的任意地方使用,但是会带来一个问题,那就是本篇所解决的一个异常:socket closed。
原因:
因为服务器端socket对象在执行完这个线程的时候,会将该BufferedWriter流关闭以完成传输并且回收资源。但是由于BufferedWriter对象是在Thread类中声明的,所以当服务器端的while循环再次执行该线程的时候,会发现该bw对象在引用的时候已经是关闭状态了,所以会报出异常。
解决:
private BufferedWriter bw = null;
与
bw = new BufferedWriter(
new OutputStreamWriter(
socket.getOutputStream(), "UTF-8"));
写在一起并且都放入try{}中,这样每次执行该线程的时候都会重新创建一个BufferedWriter对象,无论上一个Buffered对象是否为关闭状态。
作者邮箱:525940677@qq.com
有问题大家一起讨论。
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