[英]Any IPC Mechanisms between Java and C in Windows - Dont want Sockets
[英]Java IPC w/Sockets - Using Loopback Device
所以我试图在一个项目的进程之间实现套接字通信。 但是我似乎无法通过环回设备连接到任何端口。 我在这里错过了什么吗? 我已经让它在近 500 个端口上进行了尝试,但它总是拒绝连接。
static final String HOST = "127.0.0.1";
public static void main(String[] args) throws IOException {
int port = 1000;
while (true) {
try {
socket = new Socket(HOST, PORT); // initialing the socket
writer = new OutputStreamWriter(socket.getOutputStream());
reader = new InputStreamReader(socket.getInputStream());
break;
} catch (ConnectException ex) {
System.out.println("failure on port: " + port);
++port; // increment port to try next
}
}
...
};
如果有人想查看声明等等,这里是整个程序。
package socket_ipc;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.InputStreamReader;
import java.net.ConnectException;
import java.net.Socket;
public class Socket_IPC {
static final int NUMBER_OF_MESSAGES = 100; // number of messages to pass
static int[] PRODUCED_MSSG = new int[NUMBER_OF_MESSAGES]; // for comparing
static int[] CONSUMED_MSSG = new int[NUMBER_OF_MESSAGES]; // for comparing
static final String HOST = "127.0.0.1"; // IP address of loopback device
static final int PORT = 1000; // arbitrary port number (local)
static OutputStreamWriter writer; // write to socket
static InputStreamReader reader; // read from socket
static Socket socket; // the socket
private static class s_Producer extends Thread {
@Override
public void run() {
for (int i = 0; i < NUMBER_OF_MESSAGES; i++) {
try {
PRODUCED_MSSG[i] = (int)(Math.random() * 256); // get data
writer.write(PRODUCED_MSSG[i]); // write data to the socket
} catch (IOException ex) {
System.err.println(ex.toString());
}
}
}
}
private static class s_Consumer extends Thread {
@Override
public void run() {
for(int i = 0; i < NUMBER_OF_MESSAGES; i++) {
try {
int data = reader.read(); // obtain data from the socket
CONSUMED_MSSG[i] = data; // put retrieved data in array
} catch (IOException ex) {
System.err.println(ex.toString());
}
}
}
}
public static void main(String[] args) throws IOException {
int port = PORT; // beginning at 1000
while (true) {
try {
socket = new Socket(HOST, port); // initialing the socket
writer = new OutputStreamWriter(socket.getOutputStream());
reader = new InputStreamReader(socket.getInputStream());
break;
} catch (ConnectException ex) {
System.out.println("failure on port: " + port);
++port; // increment port to try next
}
}
/* insanciating and starting the producer process */
s_Producer p = new s_Producer();
p.start();
/* insanciating and starting the consumer process */
s_Consumer c = new s_Consumer();
c.start();
try { /* joining threads to wait for completion */
p.join();
c.join();
} catch (InterruptedException ex) {
System.err.println(ex.toString());
}
for (int i = 0; i < NUMBER_OF_MESSAGES; i++) {
System.out.println(
"[" + i + "]: " + PRODUCED_MSSG[i] + " == " + CONSUMED_MSSG[i]);
if (PRODUCED_MSSG[i] != CONSUMED_MSSG[i]) {
System.out.println("PROCESS SYNCHRONIZATION ERROR!");
System.exit(0);
}
}
System.out.println("PROCESS SYNCHRONIZATION SUCCESS!");
}
};
好吧,我不确定问题的确切原因是什么,很可能是使用了小于 1024 的端口号。此外,我最终遇到了一组很棒的封装读取器/ DataOutputStream
器、 DataOutputStream
和DataInputStream
类。 通过提供基于对象的特定读写操作,这些提供了一个更简单的解决方案; 例如dis.readInt()
和dos.writeInt(int n)
。
这是完成并成功运行的源代码:
package socket_ipc;
import java.net.*;
import java.io.*;
/** Socket Inter-Process Communication.
* Implements the Producer-Consumer Problem, using Sockets for IPC.
* @author William Hatfield: CEG-4350-01 Fall 2015
*/
public class Socket_IPC {
static final int NUMBER_OF_MESSAGES = 100; // number of messages to pass
static int[] PRODUCED_MSSG = new int[NUMBER_OF_MESSAGES]; // for comparing
static int[] CONSUMED_MSSG = new int[NUMBER_OF_MESSAGES]; // for comparing
static final String HOST = "127.0.0.1"; // IP address of loopback device
static final int PORT = 1234; // arbitrary port number (local)
static ServerSocket serverSocket; // the shared server socket
private static class Producer extends Thread {
@Override
public void run() {
try {
Socket toClient = serverSocket.accept();
DataOutputStream dos = new DataOutputStream(toClient.getOutputStream());
for (int i = 0; i < NUMBER_OF_MESSAGES; i++) {
PRODUCED_MSSG[i] =
(int)((Math.random() - .5) * Integer.MAX_VALUE);
dos.writeInt(PRODUCED_MSSG[i]);
}
} catch (IOException ex) {
System.err.println("Producer Error: " + ex.toString());
}
}
}
private static class Consumer extends Thread {
@Override
public void run() {
try {
Socket fromServer = new Socket(HOST, PORT);
DataInputStream dis = new DataInputStream(fromServer.getInputStream());
for (int i = 0; i < NUMBER_OF_MESSAGES; i++) {
CONSUMED_MSSG[i] = dis.readInt();
}
} catch (IOException ex) {
System.err.println("Consumer Error: " + ex.toString());
}
}
}
public static void main(String[] args) {
try {
serverSocket = new ServerSocket(PORT);
Producer p = new Producer(); // create the producer thread
Consumer c = new Consumer(); // create the consumer thread
p.start(); // start the producer thread
c.start(); // start the consumer thread
p.join(); // wait for producer thread
c.join(); // wait for consumer thread
} catch (InterruptedException | IOException ex) { /* handle later */ }
/* compare produced and consumed data, exit if any match fails */
for (int i = 0; i < NUMBER_OF_MESSAGES; i++) {
System.out.print("[" + i + "]: " + PRODUCED_MSSG[i]);
System.out.println(" == " + CONSUMED_MSSG[i]);
if (PRODUCED_MSSG[i] != CONSUMED_MSSG[i]) {
System.out.println("PROCESS SYNC ERROR AT INDEX: " + i);
System.exit(0);
}
}
/* inform the user that synchroniozation was succesful, then exit */
System.out.println("SYNC SUCCESFUL!");
}
}
如果您想提供任何改进,我很乐意倾听。 特别是对于顽固的 Java 程序员,我敢肯定这里有一些违反标准 Java 实践的东西!
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