开发常用妙代码

1、获取当前线程pid--dubbo源码

private static int PID = -1;
public static int getPid() {
        if (PID < 0) {
            try {
                RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
                String name = runtime.getName(); // format: "pid@hostname"
                PID = Integer.parseInt(name.substring(0, name.indexOf('@')));
            } catch (Throwable e) {
                PID = 0;
            }
        }
        return PID;
    }

2、spring解析 Autowired和Value注解类

AutowiredAnnotationBeanPostProcessor