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SocketNIO.java
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69 lines (52 loc) · 2.68 KB
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package com.zs.system.io;
import java.net.InetSocketAddress;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.LinkedList;
public class SocketNIO {
// what why how
public static void main(String[] args) throws Exception {
LinkedList<SocketChannel> clients = new LinkedList<>();
ServerSocketChannel ss = ServerSocketChannel.open(); //服务端开启监听：接受客户端
ss.bind(new InetSocketAddress(9090));
ss.configureBlocking(false); //重点 OS NONBLOCKING!!! //只让接受客户端 不阻塞
// ss.setOption(StandardSocketOptions.TCP_NODELAY, false);
// StandardSocketOptions.TCP_NODELAY
// StandardSocketOptions.SO_KEEPALIVE
// StandardSocketOptions.SO_LINGER
// StandardSocketOptions.SO_RCVBUF
// StandardSocketOptions.SO_SNDBUF
// StandardSocketOptions.SO_REUSEADDR
while (true) {
//接受客户端的连接
Thread.sleep(1000);
SocketChannel client = ss.accept(); //不会阻塞？ -1 NULL
//accept 调用内核了：1，没有客户端连接进来，返回值？在BIO 的时候一直卡着，但是在NIO ，不卡着，返回-1，NULL
//如果来客户端的连接，accept 返回的是这个客户端的fd 5，client object
//NONBLOCKING 就是代码能往下走了，只不过有不同的情况
if (client == null) {
// System.out.println("null.....");
} else {
client.configureBlocking(false); //重点 socket（服务端的listen socket<连接请求三次握手后，往我这里扔，我去通过accept 得到 连接的socket>，连接socket<连接后的数据读写使用的> ）
int port = client.socket().getPort();
System.out.println("client..port: " + port);
clients.add(client);
}
ByteBuffer buffer = ByteBuffer.allocateDirect(4096); //可以在堆里 堆外
//遍历已经链接进来的客户端能不能读写数据
for (SocketChannel c : clients) { //串行化！！！！ 多线程！！
int num = c.read(buffer); // >0 -1 0 //不会阻塞
if (num > 0) {
buffer.flip();
byte[] aaa = new byte[buffer.limit()];
buffer.get(aaa);
String b = new String(aaa);
System.out.println(c.socket().getPort() + " : " + b);
buffer.clear();
}
}
}
}
}