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线程间通过管道流进行通信

管道流主要用于在不同线程间直接传送数据

一个线程发送数据到输出管道，另一个线程从输入管道中读取数据，进而实现不同线程间的通信

字节管道流

-------------------------------------------------------------字节流-------------------------------------------------------------

 1 package com.qf.test12.pipe.Stream;
 2 
 3 import java.io.IOException;
 4 import java.io.PipedOutputStream;
 5 
 6 /**
 7  * @author qf
 8  * @create 2018-09-20 9:26
 9  */
10 public class WriteData {
11     public void testWrite(PipedOutputStream out){
12         try {
13             System.out.println("write:");
14             for (int i = 0; i < 50; i++) {
15                 String str = " "+(i+1);
16                 out.write(str.getBytes());
17                 System.out.print(str);
18             }
19             System.out.println();
20             out.close();
21         } catch (IOException e) {
22             e.printStackTrace();
23         }
24     }
25 }

 1 package com.qf.test12.pipe.Stream;
 2 
 3 import java.io.IOException;
 4 import java.io.PipedInputStream;
 5 
 6 /**
 7  * @author qf
 8  * @create 2018-09-20 9:38
 9  */
10 public class ReadData {
11     public void testRead(PipedInputStream in){
12         try {
13             System.out.println("read:");
14             byte[] bytes = new byte[1024];
15             int readLen = in.read(bytes);
16             while (readLen != -1){
17                 String str = new String(bytes,0,readLen);
18                 System.out.print(str);
19                 readLen = in.read(bytes);
20             }
21             System.out.println();
22             in.close();
23         } catch (IOException e) {
24             e.printStackTrace();
25         }
26     }
27 }

-------------------------------------------------------------线程类-------------------------------------------------------------

 1 package com.qf.test12.pipe.thread;
 2 
 3 import com.qf.test12.pipe.Stream.WriteData;
 4 
 5 import java.io.PipedOutputStream;
 6 
 7 /**
 8  * @author qf
 9  * @create 2018-09-20 9:44
10  */
11 public class ThreadW extends Thread {
12     private WriteData writeData;
13     private PipedOutputStream out;
14 
15     public ThreadW(WriteData writeData, PipedOutputStream out) {
16         this.writeData = writeData;
17         this.out = out;
18     }
19 
20     @Override
21     public void run() {
22         writeData.testWrite(out);
23     }
24 }

 1 package com.qf.test12.pipe.thread;
 2 
 3 import com.qf.test12.pipe.Stream.ReadData;
 4 
 5 import java.io.PipedInputStream;
 6 
 7 /**
 8  * @author qf
 9  * @create 2018-09-20 9:45
10  */
11 public class ThreadR extends Thread {
12     private ReadData readData;
13     private PipedInputStream in;
14 
15     public ThreadR(ReadData readData, PipedInputStream in) {
16         this.readData = readData;
17         this.in = in;
18     }
19 
20     @Override
21     public void run() {
22         readData.testRead(in);
23     }
24 }

-------------------------------------------------------------测试类-------------------------------------------------------------

 1 package com.qf.test12;
 2 
 3 import com.qf.test12.pipe.Stream.ReadData;
 4 import com.qf.test12.pipe.Stream.WriteData;
 5 import com.qf.test12.pipe.thread.ThreadR;
 6 import com.qf.test12.pipe.thread.ThreadW;
 7 
 8 import java.io.IOException;
 9 import java.io.PipedInputStream;
10 import java.io.PipedOutputStream;
11 
12 /**
13  * @author qf
14  * @create 2018-09-20 9:47
15  */
16 public class RunStream {
17     public static void main(String[] args) {
18         try {
19             WriteData write = new WriteData();
20             ReadData read = new ReadData();
21 
22             PipedInputStream in = new PipedInputStream();
23             PipedOutputStream out = new PipedOutputStream();
24 
25             out.connect(in);// 或者in.connect(out);作用是使得两个Stream流之间产生通信连接，才能对数据进行输入输出
26 
27             ThreadR threadR = new ThreadR(read,in);
28             threadR.start();
29 
30             Thread.sleep(2000);
31 
32             ThreadW threadW = new ThreadW(write,out);
33             threadW.start();
34 
35         } catch (IOException e) {
36             e.printStackTrace();
37         } catch (InterruptedException e) {
38             e.printStackTrace();
39         }
40     }
41 }

------------------------------------------------------------打印输出-----------------------------------------------------------

read:
//休眠2000ms
write:
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

线程threadR先被启动，但是因为管道流中并没有数据，所以线程会阻塞在in.read(bytes)这里，直到有数据被写入，才会继续向下运行

字符管道流

将写入/读取数据的方式改为字符流的形式

-------------------------------------------------------------字符流-------------------------------------------------------------

 1 package com.qf.test12.pipe.ReaderWriter;
 2 
 3 import java.io.IOException;
 4 import java.io.PipedReader;
 5 
 6 /**
 7  * @author qf
 8  * @create 2018-09-20 9:38
 9  */
10 public class ReadData {
11     public void testRead(PipedReader in){
12         try {
13             System.out.println("read:");
14             char[] chars = new char[1024];
15             int readLen = in.read(chars);
16             while (readLen != -1){
17                 String str = new String(chars,0,readLen);
18                 System.out.print(str);
19                 readLen = in.read(chars);
20             }
21             System.out.println();
22             in.close();
23         } catch (IOException e) {
24             e.printStackTrace();
25         }
26     }
27 }

 1 package com.qf.test12.pipe.ReaderWriter;
 2 
 3 import java.io.IOException;
 4 import java.io.PipedWriter;
 5 
 6 /**
 7  * @author qf
 8  * @create 2018-09-20 9:26
 9  */
10 public class WriteData {
11     public void testWrite(PipedWriter out){
12         try {
13             System.out.println("write:");
14             for (int i = 0; i < 50; i++) {
15                 String str = " "+(i+1);
16                 out.write(str.toCharArray());
17                 System.out.print(str);
18             }
19             System.out.println();
20             out.close();
21         } catch (IOException e) {
22             e.printStackTrace();
23         }
24     }
25 }

-------------------------------------------------------------线程类-------------------------------------------------------------

 1 package com.qf.test12.pipe.ReaderWriter.thread;
 2 
 3 
 4 import com.qf.test12.pipe.ReaderWriter.ReadData;
 5 
 6 import java.io.PipedReader;
 7 
 8 
 9 /**
10  * @author qf
11  * @create 2018-09-20 9:45
12  */
13 public class ThreadR extends Thread {
14     private ReadData readData;
15     private PipedReader in;
16 
17     public ThreadR(ReadData readData, PipedReader in) {
18         this.readData = readData;
19         this.in = in;
20     }
21 
22     @Override
23     public void run() {
24         readData.testRead(in);
25     }
26 }

 1 package com.qf.test12.pipe.ReaderWriter.thread;
 2 
 3 
 4 import com.qf.test12.pipe.ReaderWriter.WriteData;
 5 
 6 import java.io.PipedWriter;
 7 
 8 /**
 9  * @author qf
10  * @create 2018-09-20 9:44
11  */
12 public class ThreadW extends Thread {
13     private WriteData writeData;
14     private PipedWriter out;
15 
16     public ThreadW(WriteData writeData, PipedWriter out) {
17         this.writeData = writeData;
18         this.out = out;
19     }
20 
21     @Override
22     public void run() {
23         writeData.testWrite(out);
24     }
25 }

-------------------------------------------------------------测试类-------------------------------------------------------------

 1 package com.qf.test12;
 2 
 3 import com.qf.test12.pipe.ReaderWriter.ReadData;
 4 import com.qf.test12.pipe.ReaderWriter.WriteData;
 5 import com.qf.test12.pipe.ReaderWriter.thread.ThreadR;
 6 import com.qf.test12.pipe.ReaderWriter.thread.ThreadW;
 7 
 8 
 9 import java.io.*;
10 
11 /**
12  * @author qf
13  * @create 2018-09-20 9:47
14  */
15 public class RunReaderWriter {
16     public static void main(String[] args) {
17         try {
18             WriteData write = new WriteData();
19             ReadData read = new ReadData();
20 
21             PipedWriter out = new PipedWriter();
22             PipedReader in = new PipedReader();
23 
24             out.connect(in);// 或者in.connect(out);作用是使得两个Stream流之间产生通信连接，才能对数据进行输入输出
25 
26             ThreadR threadR = new ThreadR(read,in);
27             threadR.start();
28 
29             Thread.sleep(2000);
30 
31             ThreadW threadW = new ThreadW(write,out);
32             threadW.start();
33 
34         } catch (IOException e) {
35             e.printStackTrace();
36         } catch (InterruptedException e) {
37             e.printStackTrace();
38         }
39     }
40 }

------------------------------------------------------------打印输出-----------------------------------------------------------

read:
//睡眠2000ms
write:
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

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原文地址：https://www.cnblogs.com/qf123/p/9679397.html