Java 服务器套接字不重用地址 [英] Java server socket doesn't reuse address
问题描述
我在 linux 中使用服务器套接字,我需要在 time_wait TCP 状态到期之前关闭它并重新打开.我在绑定之前设置了服务器套接字的重用地址选项,但它仍然抛出一个 BindException.我也试过这个 http://meteatamel.wordpress.com/2010/12/01/socket-reuseaddress-property-and-linux/ 但它仍然不起作用.
I am using a server socket in linux and I need to close it and reopen before the time_wait TCP status expires. I set the reuse address option of the server socket before the binding but it still throws a BindException. I also tried this http://meteatamel.wordpress.com/2010/12/01/socket-reuseaddress-property-and-linux/ but it still doesn't work.
要打开我使用的服务器套接字:
To open a server socket i use:
ServerSocket ss = new ServerSocket();
ss.setReuseAddress(true);
ss.bind(new InetSocketAddress(12345));
并关闭:
ss.close();
在绑定调用时抛出地址已在使用中"BindException.
The "Address already in use" BindException is throwed at the bind call.
此代码生成异常:
for (int i = 0; i < 2; i++) {
new Thread(new Runnable() {
@Override
public void run() {
try {
final ServerSocket ss = new ServerSocket();
ss.setReuseAddress(true);
ss.bind(new InetSocketAddress(12345));
Socket s = ss.accept();
System.out.println((char) s.getInputStream().read());
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
Thread.sleep(500);
Socket s = new Socket("localhost", 12345);
s.getOutputStream().write('c');
}
推荐答案
你设置重用 before 绑定而不是在你得到异常之后.
You set reuse before binding not after you get an exception.
ServerSocket ss = new ServerSocket(); // don't bind just yet
ss.setReuseAddress(true);
ss.bind(new InetSocketAddress(12345)); // can bind with reuse= true
这在 Windows 7 和 RHEL 5.x 上运行没有错误
This runs without error on Windows 7 and RHEL 5.x
for (int i = 0; i < 1000; i++) {
Thread t = new Thread(new Runnable() {
@Override
public void run() {
try {
final ServerSocket ss = new ServerSocket();
ss.setReuseAddress(true);
ss.bind(new InetSocketAddress(12345));
Socket s = ss.accept();
System.out.println((char) s.getInputStream().read());
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
t.start();
Thread.sleep(50);
Socket s = new Socket("localhost", 12345);
s.getOutputStream().write('c');
t.join();
}
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