获取当前运行代码的类名，方法名，行号

/*
* 1.获取当前运行代码的类名，方法名，行号，主要是通过java.lang.StackTraceElement类
*
* 2.
*   [1]获得调用者的方法名, 同new Throwable
*         String _methodName = new Exception().getStackTrace()[1].getMethodName();
*   [0]获得当前的方法名, 同new Throwable
*         String _thisMethodName = new Exception().getStackTrace()[0].getMethodName();
* */
public class StackTraceElementTest {

public static void main(String[] args) {
System.out.println("line1: " + new Throwable().getStackTrace()[0].getLineNumber());
System.out.println("line2: " + getLineInfo());
System.out.println("line3: " + getTraceInfo());

StackTraceElement ste1 = null;
StackTraceElement[] steArray = Thread.currentThread().getStackTrace();
int steArrayLength = steArray.length;
String s = null;
// output all related info of the existing stack traces
if(steArrayLength==0) {
System.err.println("No Stack Trace.");
} else {
for (int i=0; i<steArrayLength; i++) {
System.out.println("Stack Trace-" + i);
ste1 = steArray[i];
s = ste1.getFileName() + ": Line " + ste1.getLineNumber();
System.out.println(s);
}
}
}

public static String getTraceInfo(){
StringBuffer sb = new StringBuffer();

StackTraceElement[] stacks = new Throwable().getStackTrace();
int stacksLen = stacks.length;
sb.append("class: " ).append(stacks[1].getClassName())
.append("; method: ").append(stacks[1].getMethodName())
.append("; number: ").append(stacks[1].getLineNumber());

return sb.toString();
}

public static String getLineInfo() {
StackTraceElement ste = new Throwable().getStackTrace()[1];
return ste.getFileName() + ": Line " + ste.getLineNumber();
}

}