字节码编程，Byte-buddy篇二《监控方法执行耗时动态获取出入参类型和值》

public class BizMethod {

    public String queryUserInfo(String uid, String token) throws InterruptedException {
        Thread.sleep(new Random().nextInt(500));
        return "德莱联盟，王牌工程师。小傅哥(公众号：bugstack虫洞栈)，申请出栈！";
    }

}

@Test
public void test_byteBuddy() throws Exception {
    DynamicType.Unloaded<?> dynamicType = new ByteBuddy()
            .subclass(BizMethod.class)
            .method(ElementMatchers.named("queryUserInfo"))
            .intercept(MethodDelegation.to(MonitorDemo.class))
            .make();

    // 加载类
    Class<?> clazz = dynamicType.load(ApiTest.class.getClassLoader())
            .getLoaded();  

    // 反射调用
    clazz.getMethod("queryUserInfo", String.class, String.class).invoke(clazz.newInstance(), "10001", "Adhl9dkl");
}

public class MonitorDemo {

    @RuntimeType
    public static Object intercept(@SuperCall Callable<?> callable) throws Exception {
        long start = System.currentTimeMillis();
        try {
            return callable.call();
        } finally {
            System.out.println("方法耗时：" + (System.currentTimeMillis() - start) + "ms");
        }
    }

}

方法耗时：419ms

Process finished with exit code 0

@RuntimeType
public static Object intercept(@Origin Method method, @SuperCall Callable<?> callable) throws Exception {
    long start = System.currentTimeMillis();
    Object resObj = null;
    try {
        resObj = callable.call();
        return resObj;
    } finally {
        System.out.println("方法名称：" + method.getName());
        System.out.println("入参个数：" + method.getParameterCount());
        System.out.println("入参类型：" + method.getParameterTypes()[0].getTypeName() + "、" + method.getParameterTypes()[1].getTypeName());
        System.out.println("出参类型：" + method.getReturnType().getName());
        System.out.println("出参结果：" + resObj);
        System.out.println("方法耗时：" + (System.currentTimeMillis() - start) + "ms");
    }
}

方法名称：queryUserInfo
入参个数：2
入参类型：java.lang.String、java.lang.String
出参类型：java.lang.String
出参结果：德莱联盟，王牌工程师。小傅哥(公众号：bugstack虫洞栈)，申请出栈！
方法耗时：490ms

Process finished with exit code 0

@RuntimeType
public static Object intercept(@Origin Method method, @AllArguments Object[] args, @Argument(0) Object arg0, @SuperCall Callable<?> callable) throws Exception {
    long start = System.currentTimeMillis();
    Object resObj = null;
    try {
        resObj = callable.call();
        return resObj;
    } finally {
        System.out.println("方法名称：" + method.getName());
        System.out.println("入参个数：" + method.getParameterCount());
        System.out.println("入参类型：" + method.getParameterTypes()[0].getTypeName() + "、" + method.getParameterTypes()[1].getTypeName());
        System.out.println("入参内容：" + arg0 + "、" + args[1]);
        System.out.println("出参类型：" + method.getReturnType().getName());
        System.out.println("出参结果：" + resObj);
        System.out.println("方法耗时：" + (System.currentTimeMillis() - start) + "ms");
    }
}

方法名称：queryUserInfo
入参个数：2
入参类型：java.lang.String、java.lang.String
入参内容：10001、Adhl9dkl
出参类型：java.lang.String
出参结果：德莱联盟，王牌工程师。小傅哥(公众号：bugstack虫洞栈)，申请出栈！
方法耗时：405ms

Process finished with exit code 0

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