/**
       * Get the method name for a depth in call stack. <br />
       * Utility function
       * @param depth depth in the call stack (0 means current method, 1 means call method, ...)
       * @return method name
       */
      public static String getMethodName(final int depth)
      {
        final StackTraceElement[] ste = new Throwable().getStackTrace();

        //System. out.println(ste[ste.length-depth].getClassName()+"#"+ste[ste.length-depth].getMethodName());
        return ste[ste.length - depth].getMethodName();
      }

例如，如果你试图获得用于调试目的的调用方法行，你需要通过编写这些静态方法的Utility类: (旧的java1.4代码，只是为了说明StackTraceElement的潜在用法)

        /**
          * Returns the first "[class#method(line)]: " of the first class not equal to "StackTraceUtils". <br />
          * From the Stack Trace.
          * @return "[class#method(line)]: " (never empty, first class past StackTraceUtils)
          */
        public static String getClassMethodLine()
        {
            return getClassMethodLine(null);
        }

        /**
          * Returns the first "[class#method(line)]: " of the first class not equal to "StackTraceUtils" and aclass. <br />
          * Allows to get past a certain class.
          * @param aclass class to get pass in the stack trace. If null, only try to get past StackTraceUtils. 
          * @return "[class#method(line)]: " (never empty, because if aclass is not found, returns first class past StackTraceUtils)
          */
        public static String getClassMethodLine(final Class aclass)
        {
            final StackTraceElement st = getCallingStackTraceElement(aclass);
            final String amsg = "[" + st.getClassName() + "#" + st.getMethodName() + "(" + st.getLineNumber()
            +")] <" + Thread.currentThread().getName() + ">: ";
            return amsg;
        }

     /**
       * Returns the first stack trace element of the first class not equal to "StackTraceUtils" or "LogUtils" and aClass. <br />
       * Stored in array of the callstack. <br />
       * Allows to get past a certain class.
       * @param aclass class to get pass in the stack trace. If null, only try to get past StackTraceUtils. 
       * @return stackTraceElement (never null, because if aClass is not found, returns first class past StackTraceUtils)
       * @throws AssertionFailedException if resulting statckTrace is null (RuntimeException)
       */
      public static StackTraceElement getCallingStackTraceElement(final Class aclass)
      {
        final Throwable           t         = new Throwable();
        final StackTraceElement[] ste       = t.getStackTrace();
        int index = 1;
        final int limit = ste.length;
        StackTraceElement   st        = ste[index];
        String              className = st.getClassName();
        boolean aclassfound = false;
        if(aclass == null)
        {
            aclassfound = true;
        }
        StackTraceElement   resst = null;
        while(index < limit)
        {
            if(shouldExamine(className, aclass) == true)
            {
                if(resst == null)
                {
                    resst = st;
                }
                if(aclassfound == true)
                {
                    final StackTraceElement ast = onClassfound(aclass, className, st);
                    if(ast != null)
                    {
                        resst = ast;
                        break;
                    }
                }
                else
                {
                    if(aclass != null && aclass.getName().equals(className) == true)
                    {
                        aclassfound = true;
                    }
                }
            }
            index = index + 1;
            st        = ste[index];
            className = st.getClassName();
        }
        if(resst == null) 
        {
            //Assert.isNotNull(resst, "stack trace should null"); //NO OTHERWISE circular dependencies 
            throw new AssertionFailedException(StackTraceUtils.getClassMethodLine() + " null argument:" + "stack trace should null"); //$NON-NLS-1$
        }
        return resst;
      }

      static private boolean shouldExamine(String className, Class aclass)
      {
          final boolean res = StackTraceUtils.class.getName().equals(className) == false && (className.endsWith("LogUtils"
            ) == false || (aclass !=null && aclass.getName().endsWith("LogUtils")));
          return res;
      }

      static private StackTraceElement onClassfound(Class aclass, String className, StackTraceElement st)
      {
          StackTraceElement   resst = null;
          if(aclass != null && aclass.getName().equals(className) == false)
          {
              resst = st;
          }
          if(aclass == null)
          {
              resst = st;
          }
          return resst;
      }

下面是我根据本主题中显示的提示制作的部分代码。 希望能有所帮助。

(请随时提出任何建议来改进此代码，请告诉我)

柜台:

public class InstanceCount{
    private static Map<Integer, CounterInstanceLog> instanceMap = new HashMap<Integer, CounterInstanceLog>();
private CounterInstanceLog counterInstanceLog;


    public void count() {
        counterInstanceLog= new counterInstanceLog();
    if(counterInstanceLog.getIdHashCode() != 0){
    try {
        if (instanceMap .containsKey(counterInstanceLog.getIdHashCode())) {
         counterInstanceLog= instanceMap .get(counterInstanceLog.getIdHashCode());
    }

    counterInstanceLog.incrementCounter();

            instanceMap .put(counterInstanceLog.getIdHashCode(), counterInstanceLog);
    }

    (...)
}

对象是:

public class CounterInstanceLog{
    private int idHashCode;
    private StackTraceElement[] arrayStackTraceElements;
    private int instanceCount;
    private String callerClassName;

    private StackTraceElement getProjectClasses(int depth) {
      if(depth< 10){
        getCallerClassName(sun.reflect.Reflection.getCallerClass(depth).getName());
        if(getCallerClassName().startsWith("com.yourproject.model")){
            setStackTraceElements(Thread.currentThread().getStackTrace());
            setIdHashCode();
        return arrayStackTraceElements[depth];
        }
        //+2 because one new item are added to the stackflow
        return getProjectClasses(profundidade+2);           
      }else{
        return null;
      }
    }

    private void setIdHashCode() {
        if(getNomeClasse() != null){
            this.idHashCode = (getCallerClassName()).hashCode();
        }
    }

    public void incrementaContador() {
    this.instanceCount++;
}

    //getters and setters

    (...)



}

这个方法做同样的事情，但更简单一点，可能性能更好一点，在你使用反射的情况下，它会自动跳过那些帧。唯一的问题是它可能不会出现在非sun的jvm中，尽管它包含在JRockit 1.4—>1.6的运行时类中。(重点是，它不是一个公共类)。

sun.reflect.Reflection

    /** Returns the class of the method <code>realFramesToSkip</code>
        frames up the stack (zero-based), ignoring frames associated
        with java.lang.reflect.Method.invoke() and its implementation.
        The first frame is that associated with this method, so
        <code>getCallerClass(0)</code> returns the Class object for
        sun.reflect.Reflection. Frames associated with
        java.lang.reflect.Method.invoke() and its implementation are
        completely ignored and do not count toward the number of "real"
        frames skipped. */
    public static native Class getCallerClass(int realFramesToSkip);

至于realFramesToSkip的值应该是什么，Sun 1.5和1.6虚拟机版本的java.lang. lang. js。系统中，有一个名为getCallerClass()的包保护方法，它调用sun.reflect. reflect. getCallerClass(3)，但在我的助手实用程序类中，我使用了4，因为有添加的助手类调用的帧。

Java 9 - JEP 259:栈遍历API

JEP 259为堆栈遍历提供了一个有效的标准API，允许对堆栈跟踪中的信息进行轻松过滤和延迟访问。在栈遍历API之前，访问栈帧的常见方法有:

的数组返回 包含类名和方法的StackTraceElement对象 每个堆栈跟踪元素的名称。 SecurityManager::getClassContext是一个受保护的方法 SecurityManager的子类来访问类上下文。 JDK-internal sun.reflect。Reflection::getCallerClass方法，你不应该使用它

使用这些api通常效率很低:

这些api要求VM急切地捕获整个快照 堆栈，它们返回表示整个堆栈的信息。 没有办法避免检查所有帧的代价，如果 调用者只对堆栈上的前几帧感兴趣。

为了找到直接调用者的类，首先获取一个StackWalker:

StackWalker walker = StackWalker
                           .getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);

然后调用getCallerClass():

Class<?> callerClass = walker.getCallerClass();

或者遍历StackFrame并获得前面的第一个StackFrame:

walker.walk(frames -> frames
      .map(StackWalker.StackFrame::getDeclaringClass)
      .skip(1)
      .findFirst());

注意:如果你使用Java 9或更高版本，你应该使用Ali Dehghani的回答中描述的StackWalker.getCallerClass()。

由于历史原因，下面不同方法的比较非常有趣。

可以在此请求的注释中找到替代解决方案。 它使用自定义SecurityManager的getClassContext()方法，似乎比堆栈跟踪方法快。

下面的程序测试了不同建议方法的速度(最有趣的部分是内部类SecurityManagerMethod):

/**
 * Test the speed of various methods for getting the caller class name
 */
public class TestGetCallerClassName {

  /**
   * Abstract class for testing different methods of getting the caller class name
   */
  private static abstract class GetCallerClassNameMethod {
      public abstract String getCallerClassName(int callStackDepth);
      public abstract String getMethodName();
  }

  /**
   * Uses the internal Reflection class
   */
  private static class ReflectionMethod extends GetCallerClassNameMethod {
      public String getCallerClassName(int callStackDepth) {
          return sun.reflect.Reflection.getCallerClass(callStackDepth).getName();
      }

      public String getMethodName() {
          return "Reflection";
      }
  }

  /**
   * Get a stack trace from the current thread
   */
  private static class ThreadStackTraceMethod extends GetCallerClassNameMethod {
      public String  getCallerClassName(int callStackDepth) {
          return Thread.currentThread().getStackTrace()[callStackDepth].getClassName();
      }

      public String getMethodName() {
          return "Current Thread StackTrace";
      }
  }

  /**
   * Get a stack trace from a new Throwable
   */
  private static class ThrowableStackTraceMethod extends GetCallerClassNameMethod {

      public String getCallerClassName(int callStackDepth) {
          return new Throwable().getStackTrace()[callStackDepth].getClassName();
      }

      public String getMethodName() {
          return "Throwable StackTrace";
      }
  }

  /**
   * Use the SecurityManager.getClassContext()
   */
  private static class SecurityManagerMethod extends GetCallerClassNameMethod {
      public String  getCallerClassName(int callStackDepth) {
          return mySecurityManager.getCallerClassName(callStackDepth);
      }

      public String getMethodName() {
          return "SecurityManager";
      }

      /** 
       * A custom security manager that exposes the getClassContext() information
       */
      static class MySecurityManager extends SecurityManager {
          public String getCallerClassName(int callStackDepth) {
              return getClassContext()[callStackDepth].getName();
          }
      }

      private final static MySecurityManager mySecurityManager =
          new MySecurityManager();
  }

  /**
   * Test all four methods
   */
  public static void main(String[] args) {
      testMethod(new ReflectionMethod());
      testMethod(new ThreadStackTraceMethod());
      testMethod(new ThrowableStackTraceMethod());
      testMethod(new SecurityManagerMethod());
  }

  private static void testMethod(GetCallerClassNameMethod method) {
      long startTime = System.nanoTime();
      String className = null;
      for (int i = 0; i < 1000000; i++) {
          className = method.getCallerClassName(2);
      }
      printElapsedTime(method.getMethodName(), startTime);
  }

  private static void printElapsedTime(String title, long startTime) {
      System.out.println(title + ": " + ((double)(System.nanoTime() - startTime))/1000000 + " ms.");
  }
}

运行Java 1.6.0_17的2.4 GHz英特尔酷睿2双核MacBook的输出示例:

Reflection: 10.195 ms.
Current Thread StackTrace: 5886.964 ms.
Throwable StackTrace: 4700.073 ms.
SecurityManager: 1046.804 ms.

内部反射方法比其他方法快得多。从新创建的Throwable中获取堆栈跟踪比从当前线程中获取堆栈跟踪要快。在寻找调用者类的非内部方法中，自定义SecurityManager似乎是最快的。

更新

正如lyomi在这条评论中指出的那样，sun.reflect. reflect. getcallerclass()方法在Java 7 update 40中默认被禁用，在Java 8中被完全删除。有关这方面的更多信息，请参阅本期Java错误数据库。

更新2

正如zammbi所发现的，Oracle被迫退出删除sun.reflect. reflect. getcallerclass()的更改。在Java 8中仍然可用(但已弃用)。

更新3

3年后:更新当前JVM的计时。

> java -version
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)
> java TestGetCallerClassName
Reflection: 0.194s.
Current Thread StackTrace: 3.887s.
Throwable StackTrace: 3.173s.
SecurityManager: 0.565s.

简单回答ReflectionUtils.getCallingClass(0)

长答案(代码，Groovy)

package my

import org.codehaus.groovy.reflection.ReflectionUtils
import java.lang.reflect.Field
import java.lang.reflect.Method

trait Reflector {

    static String[] fieldNames() {
        List<String> names = []
        Arrays.asList(naturalFields()).forEach { Field fl -> names.add(fl.name) }
        return names.toArray() as String[]
    }

    static Field[] naturalFields() {
        return finalClass().getDeclaredFields().findAll { Field fl -> !fl.synthetic }.collect()
    }

    static Method[] naturalMethods() {
        return finalClass().getDeclaredMethods().findAll { Method md -> !md.synthetic }.collect()
    }

    static Class finalClass() {
        return ReflectionUtils.getCallingClass(0)
    }

}

class Demo implements Reflector {

    int archived = 0
    int demo = 100

    static void playToo() {
        println finalClass()
    }

}

println Demo.finalClass() // class my.Demo
println Demo.naturalFields() // [private int my.Demo.archived, private int my.Demo.demo]
println Demo.fieldNames() // [archived, demo]