/**
 * @Description:
 * @param @param args
 * @return void 返回類型
 */
public static void main(String[] args) {
  // 線程池
  ExecutorService exec = Executors.newCachedThreadPool();
  // 只能5個(gè)線程同時(shí)訪問
  final Semaphore semp = new Semaphore(5);
  // 模擬20個(gè)客戶端訪問
  for (int index = 0; index < 20; index++) {
    final int NO = index;
    Runnable run = new Runnable() {
      public void run() {
        try {
          // 獲取許可
          semp.acquire();
          System.out.println("獲得Accessing: " + NO);
          Thread.sleep((long) (Math.random() * 10000));
          // 訪問完后，釋放
          semp.release();
          System.out.println("剩余可用信號(hào)-----------------"
              + semp.availablePermits());
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
    };
    exec.execute(run);
  }
  // 退出線程池
  exec.shutdown();
}

獲得Accessing: 1
獲得Accessing: 5
獲得Accessing: 2
獲得Accessing: 3
獲得Accessing: 0
剩余可用信號(hào)-----------------1
獲得Accessing: 4
剩余可用信號(hào)-----------------1
獲得Accessing: 9
剩余可用信號(hào)-----------------1
獲得Accessing: 8
剩余可用信號(hào)-----------------1
獲得Accessing: 6
剩余可用信號(hào)-----------------1
獲得Accessing: 10
剩余可用信號(hào)-----------------1
獲得Accessing: 11
剩余可用信號(hào)-----------------1
獲得Accessing: 12
剩余可用信號(hào)-----------------1
獲得Accessing: 13
剩余可用信號(hào)-----------------1
獲得Accessing: 7
剩余可用信號(hào)-----------------1
獲得Accessing: 15
剩余可用信號(hào)-----------------1
獲得Accessing: 16
剩余可用信號(hào)-----------------1
獲得Accessing: 17
剩余可用信號(hào)-----------------1
獲得Accessing: 14
剩余可用信號(hào)-----------------1
獲得Accessing: 18
剩余可用信號(hào)-----------------1
獲得Accessing: 19
剩余可用信號(hào)-----------------1
剩余可用信號(hào)-----------------2
剩余可用信號(hào)-----------------3
剩余可用信號(hào)-----------------4
剩余可用信號(hào)-----------------5

package com.jx.test;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Pipe;
public class testPipe {
	/**
   * @Description:
   * @param @param args
   * @return void 返回類型
   * @throws IOException
   */
	public static void main(String[] args) throws IOException {
		// 創(chuàng)建一個(gè)管道
		Pipe pipe = Pipe.open();
		final Pipe.SinkChannel psic = pipe.sink();
		// 要向管道寫數(shù)據(jù)，需要訪問sink通道
		final Pipe.SourceChannel psoc = pipe.source();
		// 從讀取管道的數(shù)據(jù)，需要訪問source通道
		Thread tPwriter = new Thread() {
			public void run() {
				try {
					System.out.println("send.....");
					// 創(chuàng)建一個(gè)線程，利用管道的寫入口Pipe.SinkChannel類型的psic往管道里寫入指定ByteBuffer的內(nèi)容
					int res = psic.write(ByteBuffer
										              .wrap("Hello,Pipe!測試通訊.....".getBytes("utf-16BE")));
					System.out.println("send size:" + res);
				}
				catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
		;
		Thread tPreader = new Thread() {
			public void run() {
				int bbufferSize = 1024 * 2;
				ByteBuffer bbuffer = ByteBuffer.allocate(bbufferSize);
				try {
					System.out.println("recive.....");
					// 創(chuàng)建一個(gè)線程，利用管道的讀入口Pipe.SourceChannel類型的psoc將管道里內(nèi)容讀到指定的ByteBuffer中          
					int res = psoc.read(bbuffer);
					//數(shù)據(jù)未
					System.out.println("recive size:"+res+" Content:" + ByteBufferToString(bbuffer));
				}
				catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
		;
		tPwriter.start();
		tPreader.start();
	}
	/**
   *ByteBuffer--> String的轉(zhuǎn)換函數(shù)
   */
	public static String ByteBufferToString(ByteBuffer content) {
		if (content == null || content.limit() <= 0
				        || (content.limit() == content.remaining())) {
			System.out.println("不存在或內(nèi)容為空！");
			return null;
		}
		int contentSize = content.limit() - content.remaining();
		StringBuffer resultStr = new StringBuffer();
		for (int i = 0; i < contentSize; i += 2) {
			resultStr.append(content.getchar(i));
		}
		return resultStr.toString();
	}
}