Java 获得运行时文件名，类名，方法名，行号

package com.someorg;

public class Logger {

    public static void info(String something) {
        int lineNo = getCurrentLineNumber();
        String methodName = getCurrentMethodName();
        String className = getCurrentClassName();
        System.out.println(className + "." + methodName + "(" + lineNo + "): " + something);
    }

    public static int getCurrentLineNumber() {
        return Thread.currentThread().getStackTrace()[3].getLineNumber();
    }

    public static String getCurrentMethodName() {
        return Thread.currentThread().getStackTrace()[3].getMethodName();
    }

    public static String getCurrentClassName() {
        return Thread.currentThread().getStackTrace()[3].getClassName();
    }
}

package com.someorg;

public class App {
    public static void main(String[] args) {
        m1();
    }

    public static void m1() {
        // do some logic here;
        Logger.info("Hello 1");
        m2();
    }

    public static void m2() {
        // do some logic here;
        Logger.info("Hello 2");
    }

}