OpenJDK1.8包格式轻解
这几天在看jdk的包结构,发现一个有意思的包:tools.jar
熟悉arthas的朋友可能会比较了解,arthas是如何attach到某个jvm并进行处理的?
下面我们attach到jvm看看:
public class VirtualMachineTools { public static ListgetVirtualMachineList() { List list = VirtualMachine.list(); list.forEach(virtualMachineDescriptor -> System.out.println(virtualMachineDescriptor.id() + "t" + virtualMachineDescriptor.displayName())); return list; } public static Object attachMachine(){ getVirtualMachineList().forEach(new Consumer () { @Override public void accept(VirtualMachineDescriptor virtualMachineDescriptor) { try { VirtualMachine attach = VirtualMachine.attach(virtualMachineDescriptor); System.out.println(attach.getSystemProperties()); attach.detach(); // VirtualMachine.attach(virtualMachineDescriptor.id()); } catch (AttachNotSupportedException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }); return null; } }
怎么样,arthas的dashboard是不是就有了?你想干什么不就为所欲为了
比如调个jps:
@Test public void jps(){ Jps.main(new String[]{"-help"}); }
当然如果你想使用非标准api,还是要自己承担风险: