java - 如何在Python中使正在运行的jar程序超时

Question

我正在使用以下 Command 类来使正在运行的命令超时。它与 shell 命令一起工作得很好，但是当我使用命令 java -jar 将其传递给 Command 类来启动 java 程序时，它似乎没有终止 java 进程。请帮忙。

class Command(object):

cmd = None
process = None
status = None
output, error = '', ''

def __init__(self, cmd):
    # if isinstance(cmd, basestring):
    #     cmd = shlex.split(cmd)
    self.cmd = cmd
    #self.process = None

def run(self, timeout, outputfile, errfile):
    def target():
        print 'Thread started'
        try:
            print self.cmd
            open(outputfile, 'w').close()
            open(errfile, 'w').close()
            self.process = subprocess.Popen(self.cmd, shell=True, stdout = file(outputfile, 'w+'), stderr = file(errfile, 'w+')) #
            (self.output, self.error) = self.process.communicate() #
            self.status = self.process.returncode
            print self.output #"Out:'%s'" % 
            print self.error #"Err:'%s'" % 
            print 'Thread finished'
        except:
            self.error = traceback.format_exc()
            self.status = -1      
            print self.error  

    thread = threading.Thread(target=target)
    thread.start()

    thread.join(timeout)
    if thread.is_alive():
        print 'Terminating process'
        self.process.kill() #terminate
        thread.join()
    print self.status

Answer 1

这是因为 shell 为 java 启动了一个子进程。您可以删除 shell=True 或使用命令 exec java -jar ...

来自 exec 的手册页:

The exec() family of functions replaces the current process image with a new process image.