java网络连接错误

java网络连接异常

try{
	Socket socket = new Socket();
	socket.connect(new InetSocketAddress("192.168.1.X", 22400), 50000);
}catch (Exception e) {
			System.err.println((System.currentTimeMillis() - startTime) + "ms");
			e.printStackTrace();
		}

1034ms
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at socket.BioClientTest.main(BioClientTest.java:26)
分析：ip存在，但没有对应端口服务

21026ms
java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at socket.BioClientTest.main(BioClientTest.java:26)
分析：ip不存在时，连接超时

在使用mina时，如果设置setSoLinger（true,n），n>0,在网速不好的情况下，关闭连接，可能会抛出以下异常。解决办法：不要设置setSoLinger，或设置setSoLinger(true,0);
原因：Nio下setSoLinger，close连接时存在异常，sun官方有解释
2013-01-22 10:57:13 [ERROR] com。*.net.service.DefaultSessionHandler (DefaultSessionHandler.java:77) - (0x00000004: nio socket, server, null => /192.168.1.X:223XX4)出现异常
java.io.IOException: 无法立即完成一个非阻止性套接字操作。
at sun.nio.ch.SocketDispatcher.close0(Native Method)
at sun.nio.ch.SocketDispatcher.preClose(SocketDispatcher.java:44)
at sun.nio.ch.SocketChannelImpl.implCloseSelectableChannel(SocketChannelImpl.java:710)
at java.nio.channels.spi.AbstractSelectableChannel.implCloseChannel(AbstractSelectableChannel.java:201)
at java.nio.channels.spi.AbstractInterruptibleChannel.close(AbstractInterruptibleChannel.java:97)
at org.apache.mina.transport.socket.nio.NioProcessor.destroy(NioProcessor.java:116)