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在Java中,多進(jìn)程通信可以通過多種方式實(shí)現(xiàn),其中最常用的方式包括管道、Socket、共享內(nèi)存和消息隊(duì)列等。
示例代碼:
PipedInputStream in = new PipedInputStream();
PipedOutputStream out = new PipedOutputStream();
in.connect(out); //連接輸入流和輸出流
//在一個(gè)線程中寫入數(shù)據(jù)
new Thread(() -> {
try {
out.write("Hello, World!".getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}).start();
//在另一個(gè)線程中讀取數(shù)據(jù)
new Thread(() -> {
byte[] buffer = new byte[1024];
try {
int len = in.read(buffer);
System.out.println(new String(buffer, 0, len));
} catch (IOException e) {
e.printStackTrace();
}
}).start();
示例代碼:
//服務(wù)器端代碼
ServerSocket serverSocket = new ServerSocket(8888);
Socket socket = serverSocket.accept();
OutputStream out = socket.getOutputStream();
out.write("Hello, World!".getBytes());
InputStream in = socket.getInputStream();
byte[] buffer = new byte[1024];
int len = in.read(buffer);
System.out.println(new String(buffer, 0, len));
//客戶端代碼
Socket socket = new Socket("localhost", 8888);
InputStream in = socket.getInputStream();
byte[] buffer = new byte[1024];
int len = in.read(buffer);
System.out.println(new String(buffer, 0, len));
OutputStream out = socket.getOutputStream();
out.write("Hello, World!".getBytes());
示例代碼:
File file = new File("shared_memory.dat");
RandomAccessFile raf = new RandomAccessFile(file, "rw");
MappedByteBuffer buffer = raf.getChannel().map(FileChannel.MapMode.READ_WRITE, 0, 1024);
//在一個(gè)進(jìn)程中寫入數(shù)據(jù)
buffer.put("Hello, World!".getBytes());
//在另一個(gè)進(jìn)程中讀取數(shù)據(jù)
byte[] data = new byte[1024];
buffer.get(data);
System.out.println(new String(data));
示例代碼:
//創(chuàng)建消息隊(duì)列
ConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");
Connection connection = factory.createConnection();
connection.start();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination destination = session.createQueue("myQueue");
MessageProducer producer = session.createProducer(destination);
MessageConsumer consumer = session.createConsumer(destination);
//發(fā)送消息
TextMessage message = session.createTextMessage("Hello, World!");
producer.send(message);
//接收消息
TextMessage receivedMessage = (TextMessage) consumer.receive();
System.out.println(receivedMessage.getText());
以上是Java中多進(jìn)程通信的幾種常用方式,開發(fā)者可以根據(jù)實(shí)際需求選擇適合的通信方式來實(shí)現(xiàn)進(jìn)程間通信。
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