Java I/O 的工作机制

[java]代码库

try { 
            StringBuffer str = new StringBuffer(); 
            char[] buf = new char[1024]; 
            FileReader f = new FileReader("file"); 
            while(f.read(buf)>0){ 
                str.append(buf); 
            } 
            str.toString(); 
 } catch (IOException e) {}//源代码片段来自云代码http://yuncode.net
			


public void selector() throws IOException {
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        Selector selector = Selector.open();
        ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.configureBlocking(false);//设置为非阻塞方式
        ssc.socket().bind(new InetSocketAddress(8080));
        ssc.register(selector, SelectionKey.OP_ACCEPT);//注册监听的事件
        while (true) {
            Set selectedKeys = selector.selectedKeys();//取得所有key集合
            Iterator it = selectedKeys.iterator();
            while (it.hasNext()) {
                SelectionKey key = (SelectionKey) it.next();
                if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {
                    ServerSocketChannel ssChannel = (ServerSocketChannel) key.channel();
                 SocketChannel sc = ssChannel.accept();//接受到服务端的请求
                    sc.configureBlocking(false);
                    sc.register(selector, SelectionKey.OP_READ);
                    it.remove();
                } else if 
                ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
                    SocketChannel sc = (SocketChannel) key.channel();
                    while (true) {
                        buffer.clear();
                        int n = sc.read(buffer);//读取数据
                        if (n <= 0) {
                            break;
                        }
                        buffer.flip();
                    }
                    it.remove();
                }
            }
        }
}//源代码片段来自云代码http://yuncode.net