是否有一种方法来获得Java中当前正在执行的方法的名称?
当前回答
我们使用这段代码来减少堆栈跟踪索引的潜在可变性-现在只需调用methodName util:
public class MethodNameTest {
private static final int CLIENT_CODE_STACK_INDEX;
static {
// Finds out the index of "this code" in the returned stack trace - funny but it differs in JDK 1.5 and 1.6
int i = 0;
for (StackTraceElement ste : Thread.currentThread().getStackTrace()) {
i++;
if (ste.getClassName().equals(MethodNameTest.class.getName())) {
break;
}
}
CLIENT_CODE_STACK_INDEX = i;
}
public static void main(String[] args) {
System.out.println("methodName() = " + methodName());
System.out.println("CLIENT_CODE_STACK_INDEX = " + CLIENT_CODE_STACK_INDEX);
}
public static String methodName() {
return Thread.currentThread().getStackTrace()[CLIENT_CODE_STACK_INDEX].getMethodName();
}
}
似乎是过度设计了,但我们对JDK 1.5有一些固定的数字,当我们迁移到JDK 1.6时,它发生了变化,这有点令人惊讶。现在在Java 6/7中也是一样的,但你永远不会知道。它不能证明索引在运行时发生了变化——但希望HotSpot不会做得那么糟糕。: -)
其他回答
public class SomeClass {
public void foo(){
class Local {};
String name = Local.class.getEnclosingMethod().getName();
}
}
Name的值为foo。
这是对virgo47的答案(如上)的扩展。
它提供了一些静态方法来获取当前和调用类/方法名。
/* Utility class: Getting the name of the current executing method
* https://stackoverflow.com/questions/442747/getting-the-name-of-the-current-executing-method
*
* Provides:
*
* getCurrentClassName()
* getCurrentMethodName()
* getCurrentFileName()
*
* getInvokingClassName()
* getInvokingMethodName()
* getInvokingFileName()
*
* Nb. Using StackTrace's to get this info is expensive. There are more optimised ways to obtain
* method names. See other stackoverflow posts eg. https://stackoverflow.com/questions/421280/in-java-how-do-i-find-the-caller-of-a-method-using-stacktrace-or-reflection/2924426#2924426
*
* 29/09/2012 (lem) - added methods to return (1) fully qualified names and (2) invoking class/method names
*/
package com.stackoverflow.util;
public class StackTraceInfo
{
/* (Lifted from virgo47's stackoverflow answer) */
private static final int CLIENT_CODE_STACK_INDEX;
static {
// Finds out the index of "this code" in the returned stack trace - funny but it differs in JDK 1.5 and 1.6
int i = 0;
for (StackTraceElement ste: Thread.currentThread().getStackTrace())
{
i++;
if (ste.getClassName().equals(StackTraceInfo.class.getName()))
{
break;
}
}
CLIENT_CODE_STACK_INDEX = i;
}
public static String getCurrentMethodName()
{
return getCurrentMethodName(1); // making additional overloaded method call requires +1 offset
}
private static String getCurrentMethodName(int offset)
{
return Thread.currentThread().getStackTrace()[CLIENT_CODE_STACK_INDEX + offset].getMethodName();
}
public static String getCurrentClassName()
{
return getCurrentClassName(1); // making additional overloaded method call requires +1 offset
}
private static String getCurrentClassName(int offset)
{
return Thread.currentThread().getStackTrace()[CLIENT_CODE_STACK_INDEX + offset].getClassName();
}
public static String getCurrentFileName()
{
return getCurrentFileName(1); // making additional overloaded method call requires +1 offset
}
private static String getCurrentFileName(int offset)
{
String filename = Thread.currentThread().getStackTrace()[CLIENT_CODE_STACK_INDEX + offset].getFileName();
int lineNumber = Thread.currentThread().getStackTrace()[CLIENT_CODE_STACK_INDEX + offset].getLineNumber();
return filename + ":" + lineNumber;
}
public static String getInvokingMethodName()
{
return getInvokingMethodName(2);
}
private static String getInvokingMethodName(int offset)
{
return getCurrentMethodName(offset + 1); // re-uses getCurrentMethodName() with desired index
}
public static String getInvokingClassName()
{
return getInvokingClassName(2);
}
private static String getInvokingClassName(int offset)
{
return getCurrentClassName(offset + 1); // re-uses getCurrentClassName() with desired index
}
public static String getInvokingFileName()
{
return getInvokingFileName(2);
}
private static String getInvokingFileName(int offset)
{
return getCurrentFileName(offset + 1); // re-uses getCurrentFileName() with desired index
}
public static String getCurrentMethodNameFqn()
{
return getCurrentMethodNameFqn(1);
}
private static String getCurrentMethodNameFqn(int offset)
{
String currentClassName = getCurrentClassName(offset + 1);
String currentMethodName = getCurrentMethodName(offset + 1);
return currentClassName + "." + currentMethodName ;
}
public static String getCurrentFileNameFqn()
{
String CurrentMethodNameFqn = getCurrentMethodNameFqn(1);
String currentFileName = getCurrentFileName(1);
return CurrentMethodNameFqn + "(" + currentFileName + ")";
}
public static String getInvokingMethodNameFqn()
{
return getInvokingMethodNameFqn(2);
}
private static String getInvokingMethodNameFqn(int offset)
{
String invokingClassName = getInvokingClassName(offset + 1);
String invokingMethodName = getInvokingMethodName(offset + 1);
return invokingClassName + "." + invokingMethodName;
}
public static String getInvokingFileNameFqn()
{
String invokingMethodNameFqn = getInvokingMethodNameFqn(2);
String invokingFileName = getInvokingFileName(2);
return invokingMethodNameFqn + "(" + invokingFileName + ")";
}
}
如果您想知道的方法名称是junit测试方法,那么您可以使用junit TestName规则:https://stackoverflow.com/a/1426730/3076107
我发现最快的方法是:
import java.lang.reflect.Method;
public class TraceHelper {
// save it static to have it available on every call
private static Method m;
static {
try {
m = Throwable.class.getDeclaredMethod("getStackTraceElement",
int.class);
m.setAccessible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
public static String getMethodName(final int depth) {
try {
StackTraceElement element = (StackTraceElement) m.invoke(
new Throwable(), depth + 1);
return element.getMethodName();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
它直接访问本机方法getStackTraceElement(int depth)。并将可访问的方法存储在静态变量中。
我有解决方案使用这个(在Android)
/**
* @param className fully qualified className
* <br/>
* <code>YourClassName.class.getName();</code>
* <br/><br/>
* @param classSimpleName simpleClassName
* <br/>
* <code>YourClassName.class.getSimpleName();</code>
* <br/><br/>
*/
public static void getStackTrace(final String className, final String classSimpleName) {
final StackTraceElement[] steArray = Thread.currentThread().getStackTrace();
int index = 0;
for (StackTraceElement ste : steArray) {
if (ste.getClassName().equals(className)) {
break;
}
index++;
}
if (index >= steArray.length) {
// Little Hacky
Log.w(classSimpleName, Arrays.toString(new String[]{steArray[3].getMethodName(), String.valueOf(steArray[3].getLineNumber())}));
} else {
// Legitimate
Log.w(classSimpleName, Arrays.toString(new String[]{steArray[index].getMethodName(), String.valueOf(steArray[index].getLineNumber())}));
}
}
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