使用 Runtime.exec 从 Java 应用程序启动 JVM 进程？
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Launch JVM process from a Java application use Runtime.exec?
提问by Berlin Brown
I want to be able to launch a Java server process from an existing java application and monitor the stdoutput and stderror and redirect that output to a file. Is the best approach to use 'Runtime.exec' and treat the app like any other OS process or is there something more suited for new JVMs.
我希望能够从现有的 Java 应用程序启动 Java 服务器进程并监视 stdoutput 和 stderror 并将该输出重定向到文件。是使用“Runtime.exec”并像对待任何其他操作系统进程一样对待应用程序的最佳方法，还是有更适合新 JVM 的方法。
This is on Java 1.5
这是在 Java 1.5 上
采纳答案by Fabian Steeg
Instead of Runtime, you should probably use ProcessBuilder, though I don't know if something else is even more appropriate in your case (running a Java process in particular).
而不是Runtime，您可能应该使用ProcessBuilder，但我不知道其他东西是否更适合您的情况（特别是运行 Java 进程）。
回答by Mel T.
I know I am late in this thread, but in case someone needs it, in my experience, it is easier to use ANT to launch a Java application. This has the benefit of being platform independent. Here is a sample class that does that:
我知道我在这个线程中迟到了，但如果有人需要它，根据我的经验，使用 ANT 启动 Java 应用程序更容易。这具有独立于平台的好处。这是一个执行此操作的示例类：
package com.trilliantnetworks.scheduler.quartz.test;
import java.io.File;
import java.io.PrintStream;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DefaultLogger;
import org.apache.tools.ant.DemuxOutputStream;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Echo;
import org.apache.tools.ant.taskdefs.Java;
import org.apache.tools.ant.types.Path;
public class MyLaunchTest {
public static void main(String[] args) {
Project project = new Project();
project.setBaseDir(new File(System.getProperty("user.dir")));
project.init();
DefaultLogger logger = new DefaultLogger();
project.addBuildListener(logger);
logger.setOutputPrintStream(System.out);
logger.setErrorPrintStream(System.err);
logger.setMessageOutputLevel(Project.MSG_INFO);
System.setOut(new PrintStream(new DemuxOutputStream(project, false)));
System.setErr(new PrintStream(new DemuxOutputStream(project, true)));
project.fireBuildStarted();
System.out.println("running");
Throwable caught = null;
try {
Echo echo = new Echo();
echo.setTaskName("Echo");
echo.setProject(project);
echo.init();
echo.setMessage("Launching Some Class");
echo.execute();
Java javaTask = new Java();
javaTask.setTaskName("runjava");
javaTask.setProject(project);
javaTask.setFork(true);
javaTask.setFailonerror(true);
javaTask.setClassname(MyClassToLaunch.class.getName());
Path path = new Path(project, new File(System.getProperty("user.dir") + "/classes").getAbsolutePath());
javaTask.setClasspath(path);
javaTask.init();
int ret = javaTask.executeJava();
System.out.println("java task return code: " + ret);
} catch (BuildException e) {
caught = e;
}
project.log("finished");
project.fireBuildFinished(caught);
}
}
