Java 父子进程通信
由父进程创建子进程,收发消息
package org.tango.process.parent;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.tango.process.signal.Signal;
import java.io.*;
import java.lang.reflect.Field;
import java.util.Map;
import java.util.Scanner;
/**
* Created by tango on 14-7-3.
*/
public class Main {
private static final Log LOG = LogFactory.getLog(Main.class);
private static final Signal SIGNAL = new Signal();
public static void main(String[] args) throws IOException {
try {
startProcess("java", "org.tango.process.child.SubMain", "/Users/tango/Java/Application/restruct/tango-process/tango-process-child/target/classes/", null);
Scanner scanner = new Scanner(System.in);
while (true) {
//
LOG.debug("please input message,[quit | exit]: exit program");
String next = scanner.next();
if ("quit".equals(next) || "exit".equals(next)) {
break;
}
boolean send = SIGNAL.send(next);
LOG.debug("send message : " + next + " /".concat(String.valueOf(send)));
String receive = SIGNAL.receive();
LOG.debug("receive message : " + receive);
}
LOG.debug("finish,will shutdown program");
} catch (Exception err) {
err.printStackTrace();
}
}
private static Process startProcess(String command, String args, String directory, String classPath) throws IOException, NoSuchFieldException, IllegalAccessException, InterruptedException {
ProcessBuilder builder = new ProcessBuilder();
builder.command(command, args);
//
LOG.debug("create sub process of ".concat(command).concat(" ").concat(args));
builder.directory(new File(directory));
LOG.debug("setting work directory successful : ".concat(directory));
if (classPath != null) {
Map<String, String> environment = builder.environment();
environment.put("CLASSPATH", environment.get("CLASSPATH").concat(":").concat(classPath));
LOG.debug("process environment : ".concat(environment.toString()));
}
//
final Process process = builder.start();
Field pidField = process.getClass().getDeclaredField("pid");
pidField.setAccessible(true);
Object pid = pidField.get(process);
LOG.debug("start process successful : pid/".concat(pid.toString()));
//
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
process.destroy();
}
});
LOG.debug("setting shutdown hook successful");
//
SIGNAL.setOut(new BufferedWriter(new OutputStreamWriter(process.getOutputStream())));
LOG.debug("converter out successful");
SIGNAL.setIn(new BufferedReader(new InputStreamReader(process.getInputStream())));
LOG.debug("converter in successful");
SIGNAL.setErr(new BufferedReader(new InputStreamReader(process.getErrorStream())));
LOG.debug("converter err successful");
/* BufferedReader err = SIGNAL.getErr();
System.out.println("err = " + err.readLine());*/
return process;
}
}
package org.tango.process.child;
import org.tango.process.signal.Signal;
import java.io.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* Created by tango on 14-7-5.
*/
public class SubMain {
private static final Signal SIGNAL = new Signal();
public static void main(String[] args) throws Exception {
SIGNAL.setIn(new BufferedReader(new InputStreamReader(System.in)));
SIGNAL.setOut(new BufferedWriter(new OutputStreamWriter(System.out)));
//
ExecutorService pool = Executors.newSingleThreadExecutor();
pool.execute(new Runnable() {
@Override
public void run() {
try {
while (true) {
String receive = SIGNAL.receive();
if (receive != null) {
SIGNAL.send(receive.concat(" ").concat("too"));
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}
package org.tango.process.signal;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
/**
* Created by tango on 14-7-3.
*/
public class Signal {
private BufferedReader in;
private BufferedWriter out;
private BufferedReader err;
public boolean send(String message) throws IOException {
try {
out.write(message);
out.write("\r\n");
out.flush();
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
public String receive() throws IOException {
String message = in.readLine();
return message;
}
public String valid() throws IOException {
String message = err.readLine();
return message;
}
public BufferedReader getIn() {
return in;
}
public void setIn(BufferedReader in) {
this.in = in;
}
public BufferedWriter getOut() {
return out;
}
public void setOut(BufferedWriter out) {
this.out = out;
}
public BufferedReader getErr() {
return err;
}
public void setErr(BufferedReader err) {
this.err = err;
}
}
代码清单如下:
|____tango-process
| |____pom.xml
| |____tango-process-child
| | |____pom.xml
| | |____src
| | | |____main
| | | | |____java
| | | | | |____org
| | | | | | |____tango
| | | | | | | |____process
| | | | | | | | |____child
| | | | | | | | | |____SubMain.java
| | | | | | | | |____signal
| | | | | | | | | |____Signal.java
| | | | |____resources
| | | |____test
| | | | |____java
| |____tango-process-parent
| | |____pom.xml
| | |____src
| | | |____main
| | | | |____java
| | | | | |____org
| | | | | | |____tango
| | | | | | | |____process
| | | | | | | | |____parent
| | | | | | | | | |____Main.java
| | | | | | | | |____signal
| | | | | | | | | |____Signal.java
| | | | |____resources
| | | | | |____log4j.properties