使用JavaFx应用程序中的args执行可运行的Jar

Question

我需要从javafx应用程序运行可执行jar。我正在尝试以下代码：

public void runJar() {
try {
//String serverIp = oRMIServer.getServerIP();
String arg1 = ""arg1"";
String arg2 = ""arg2"";
String command = "java -jar "  + "path/of/jar.jar " + arg1 + " " + arg2;
Runtime run = Runtime.getRuntime();
Process proc = run.exec(command);
} catch (Exception e) {
System.out.println("Exception occured "+e);
}

令人惊讶的是，如果我正在创建一个新类并编写这段代码，它会在我的eclipse中运行，但在我的JavaFX应用程序中，这段代码根本没有运行。我看不出有什么东西看起来像是被跳过了。有人能帮忙如何用java FX应用程序中的args执行java可执行jar吗。

虽然我现在已经使用

String command = "cmd /c start "" "" + classPath + "\jre\bin\javaw.exe" -jar "" + classPath + "\jarName.jar" " + runTimeArg1 + " " + runTimeArg2;
Runtime run = Runtime.getRuntime();
Process proc = run.exec(command);

在这之后，什么也没有发生。请帮忙！

Answer 1

确保您的代码在try-catch中运行并打印堆栈跟踪。您应该使用String[] command，这样就不会使用字符串串联，并使用ProcessBuilder进行调用，这样您就可以看到子流程的STDOUT/ERR。这里有一个例子：

try {
String java = Path.of(System.getProperty("java.home"),"bin", "javaw.exe").toAbsolutePath().toString();
String[] command = new String[] {java, "-jar", "\path\to\yourName.jar", "runTimeArg1", "runTimeArg2"};
exec(command); // or Runtime.getRuntime().exec(command); 
} catch (Exception e) {
System.out.println("Exception occurred "+e);
e.printStackTrace();
}

public static int exec(String[] cmd) throws InterruptedException, IOException
{
System.out.println("exec "+Arrays.toString(cmd));
ProcessBuilder pb = new ProcessBuilder(cmd);
Path tmpdir = Path.of(System.getProperty("java.io.tmpdir"));
Path out = tmpdir.resolve(cmd[0]+"-stdout.log");
Path err = tmpdir.resolve(cmd[0]+"-stderr.log");
pb.redirectOutput(out.toFile());
pb.redirectError(err.toFile());
// OR pb.redirectErrorStream(true);
Process p = pb.start();
long pid = p.pid();
System.out.println("started PID "+pid);
int rc = p.waitFor();
System.out.println("Exit PID "+pid+": RC "+rc +" => "+(rc == 0 ? "OK": "**** ERROR ****"));
System.out.println("STDOUT: ""+Files.readString(out)+'"');
System.out.println("STDERR: ""+Files.readString(err)+'"');
System.out.println();
return rc;
}