Communication between threads: Piped
- Input and output byte streams in the pipeline use PipedOutputStream (output to the pipeline), PipedInputStream (data input in the pipeline)
- Input and output character streams in the pipe, use PipedReader (read from the pipe), PipedWriter (write to the pipe)
Pipe byte stream input and output:
package com.chapter03;
import java.io.*;
class WriteData {
public void write(PipedOutputStream out) {
try {
for (int i = 0; i < 300; i++) {
String s = " " + (i + 1);
out.write(s.getBytes());
System.out.println("write: " + s);
}
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
class ReadData {
public void read(PipedInputStream in) {
try {
// int 为4个字节 20字节为4个数字
byte[] arr = new byte[20];
int length = in.read(arr);
while (length != -1) {
String s = new String(arr, 0, length);
System.out.println("\nread: " + s);
length = in.read(arr);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public class StudyThreads05管道线程通信_读取字节流 {
public static void main(String[] args) throws IOException, InterruptedException {
PipedOutputStream out = new PipedOutputStream();
PipedInputStream in = new PipedInputStream();
out.connect(in);
Thread threadWrite = new Thread() {
@Override
public void run() {
new WriteData().write(out);
}
};
Thread threadRead = new Thread() {
@Override
public void run() {
new ReadData().read(in);
}
};
threadRead.start();
Thread.sleep(2000);
threadWrite.start();
}
}
Character stream input and output in pipes
package com.chapter03;
import java.io.IOException;
import java.io.PipedReader;
import java.io.PipedWriter;
class WriteData06 {
public void write(PipedWriter writer) {
try {
for (int i = 0; i < 300; i++) {
String s = " " + (i + 1);
writer.write(s.toCharArray());
System.out.println("write: " + s);
// Thread.sleep((long) (Math.random() * 10));
}
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
class ReadData06 {
public void read(PipedReader reader) {
try {
// 读取20个字符
char[] arr = new char[20];
int length = reader.read(arr);
while (length != -1) {
String s = new String(arr, 0, length);
System.out.println("read: " + s);
length = reader.read(arr);
// Thread.sleep((long) (Math.random() * 100));
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public class StudyThreads06管道线程通信_读写字符流 {
public static void main(String[] args) throws IOException {
PipedWriter writer = new PipedWriter();
PipedReader reader = new PipedReader();
writer.connect(reader);
Thread threadWrite = new Thread(() -> new WriteData06().write(writer));
Thread threadRead = new Thread(() -> new ReadData06().read(reader));
threadRead.start();
threadWrite.start();
}
}