/*   
 * 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. 获取调用者、当前方法名
 *   [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();
         }

}