是否可以使用像AspectJ这样的AOP库实现这一目标？
我在Android上运行.
public abstract class Base {
public void printArguments() {
//Here I need to get access to arg1,arg2,arg3
}
}
.
public class MyClass extends Base {
public void (String arg1,Integer arg2,String arg3) {
super.printArguments();
}
}
最佳答案
Is it possible to achieve this using AOP libraries like AspectJ?
当然可以.这是AspectJ中典型的初学者练习,如下所示：
public class SampleClass {
public SampleClass() { super(); }
public SampleClass(String s) { this(); }
public SampleClass(int i) { this(); }
public void method01(String s,Number n,Throwable t) {}
public void method02(int i,String s,double d) {}
public void method03(String s) {}
public void method04() {}
public void method05(String s,double d) {}
public static void main(String[] args) {
new SampleClass().method01("foo",new Integer(11),new RuntimeException("error"));
new SampleClass("test").method02(11,"bar",Math.PI);
new SampleClass(123).method03("zot");
new SampleClass("another test").method04();
new SampleClass(456).method05("baz",Math.E);
}
}
现在你只需要编写一个截取所有方法执行的方面(以及可选的构造函数执行,如下所示)：
public aspect MethodArgsAspect {
pointcut allMethods() : execution(* *(..));
pointcut allConstructors() : execution(*.new(..));
before() : !within(MethodArgsAspect) && (allMethods() || allConstructors()) {
System.out.println(thisJoinPointStaticPart.getSignature());
for (Object arg : thisJoinPoint.getArgs())
System.out.println(" " + arg);
}
}
运行SampleClass.main时,此方面将打印：
void SampleClass.main(String[])
[Ljava.lang.String;@7fdcde
SampleClass()
void SampleClass.method01(String,Number,Throwable)
foo
11
java.lang.RuntimeException: error
SampleClass()
SampleClass(String)
test
void SampleClass.method02(int,String,double)
11
bar
3.141592653589793
SampleClass()
SampleClass(int)
123
void SampleClass.method03(String)
zot
SampleClass()
SampleClass(String)
another test
void SampleClass.method04()
SampleClass()
SampleClass(int)
456
void SampleClass.method05(String,double)
baz
11
2.718281828459045
