StackWalker API是一项新功能的Java 9,并提高了性能前身 堆栈跟踪元素。它还可以提供一种在异常 情况下过滤堆栈元素或了解应用程序 行为的方法。在Java 9中,访问堆栈跟踪的方式非常有限,并且可以一次提供整个堆栈信息。
在下面的示例中,我们需要在Stack Frame中打印所有属性
import java.lang.StackWalker.StackFrame; import java.util.*; import java.util.stream.*; import java.lang.StackWalker.Option; public class AllAttributesTest { public static void main(String args[]) { System.out.println("Java 9 Stack Walker API - Print all attributes in stack frame"); StackWalker newWalker = StackWalker.getInstance(Option.RETAIN_CLASS_REFERENCE); List<StackWalker.StackFrame> stackFrames = newWalker.walk(frames -> frames.limit(1).collect(Collectors.toList())); stackFrames.forEach(test-> { System.out.printf("[Bytecode Index] %d%n", test.getByteCodeIndex()); System.out.printf("[Class Name] %s%n", test.getClassName()); System.out.printf("[Declaring Class] %s%n", test.getDeclaringClass()); System.out.printf("[File Name] %s%n", test.getFileName()); System.out.printf("[Method Name] %s%n", test.getMethodName()); System.out.printf("[Is Native] %b%n", test.isNativeMethod()); System.out.printf("[Line Number] %d%n", test.getLineNumber()); }); } }
输出结果
Java 9 Stack Walker API - Print all attributes in stack frame [Bytecode Index] 21 [Class Name] AllAttributesTest [Declaring Class] class AllAttributesTest [File Name] AllAttributesTest.java [Method Name] main [Is Native] false [Line Number] 10