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本文看下使用bytebuddy如何实现抽象类#xff0c;并在子类中添加自定义注解。
1#xff1a;代码
1.1#xff1a;准备基础代码
类和方法注解
package com.dahuyou.bytebuddy.cc.mine;import java.lang.annotation.ElementType;
import java.lang.annotation.Re…写在前面
本文看下使用bytebuddy如何实现抽象类并在子类中添加自定义注解。
1代码
1.1准备基础代码
类和方法注解
package com.dahuyou.bytebuddy.cc.mine;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;Target(ElementType.TYPE)
Retention(RetentionPolicy.RUNTIME)
public interface MyAnnotationOnClazz {String loveThing() default ;int age();
}package com.dahuyou.bytebuddy.cc.mine;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;Target(ElementType.METHOD)
Retention(RetentionPolicy.RUNTIME)
public interface MyAnnotationOnMethod {String whatYouHate() default every thing;long yourMoneyAmount() default 0L;
}抽象类
package com.dahuyou.bytebuddy.cc.mine;public abstract class MyAbstractClsT {public abstract T sayHiMan(String param);
}1.2bytebuddy程序
package com.dahuyou.bytebuddy.cc.mine;import net.bytebuddy.ByteBuddy;
import net.bytebuddy.description.annotation.AnnotationDescription;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.matcher.ElementMatchers;
import java.io.File;public class TTTT {public static void main(String[] args) throws Exception {DynamicType.Unloaded? dynamicType new ByteBuddy().subclass(TypeDescription.Generic.Builder.parameterizedType(MyAbstractCls.class, String.class).build()).name(MyAbstractCls.class.getName().concat(.).concat(MyAbstractClsImpl)).method(ElementMatchers.named(sayHiMan)) // 设置要拦截的方法.intercept(MethodDelegation.to(MyInterceptor.class)) // 设置执行具体逻辑的代理.annotateMethod( AnnotationDescription.Builder.ofType(MyAnnotationOnMethod.class).define(whatYouHate, TMD,啥也不是啊).define(yourMoneyAmount, 350L).build()) // 设置类上的注解以及其属性值.annotateType(AnnotationDescription.Builder.ofType(MyAnnotationOnClazz.class).define(loveThing, 啥也不是啥也不管).define(age, 56).build()) // 设置方法上的注解以及其属性值.make();// 写到类文件中dynamicType.saveIn(new File(TTTT.class.getResource(/).getPath()));System.out.println(-----华丽的分割线----);// 获取类上的注解ClassMyAbstractClsString aClass (ClassMyAbstractClsString) Class.forName(com.dahuyou.bytebuddy.cc.mine.MyAbstractCls.MyAbstractClsImpl);MyAnnotationOnClazz myAnnotationOnClazz aClass.getAnnotation(MyAnnotationOnClazz.class);System.out.println(myAnnotationOnClazz.loveThing: myAnnotationOnClazz.loveThing());System.out.println(myAnnotationOnClazz.age: myAnnotationOnClazz.age());// 获取方法上的注解MyAnnotationOnMethod myAnnotationOnMethod aClass.getDeclaredMethod(sayHiMan, String.class).getAnnotation(MyAnnotationOnMethod.class);System.out.println(myAnnotationOnMethod.whatYouHate: myAnnotationOnMethod.whatYouHate());System.out.println(myAnnotationOnMethod.yourMoneyAmount: myAnnotationOnMethod.yourMoneyAmount());System.out.println(-----华丽的分割线----);// 执行MyAbstractClsString stringMyAbstractCls aClass.newInstance();System.out.println(stringMyAbstractCls.sayHiMan(helloooooo));}
}其中通过annotateMethod方法设置子类方法上的注解通过annotateType设置子类类上的注解运行一下
-----华丽的分割线----
myAnnotationOnClazz.loveThing: 啥也不是啥也不管
myAnnotationOnClazz.age: 56
myAnnotationOnMethod.whatYouHate: TMD,啥也不是啊
myAnnotationOnMethod.yourMoneyAmount: 350
-----华丽的分割线----
拦截了参数是hellooooooProcess finished with exit code 0查看生成的字节码:
package com.dahuyou.bytebuddy.cc.mine.MyAbstractCls;import com.dahuyou.bytebuddy.cc.mine.MyAbstractCls;
import com.dahuyou.bytebuddy.cc.mine.MyAnnotationOnClazz;
import com.dahuyou.bytebuddy.cc.mine.MyAnnotationOnMethod;
import com.dahuyou.bytebuddy.cc.mine.MyInterceptor;MyAnnotationOnClazz(loveThing 啥也不是啥也不管,age 56
)
public class MyAbstractClsImpl extends MyAbstractClsString {MyAnnotationOnMethod(whatYouHate TMD,啥也不是啊,yourMoneyAmount 350L)public String sayHiMan(String var1) {return MyInterceptor.intercept(new Object[]{var1});}public MyAbstractClsImpl() {}
}写在后面
参考文章列表
字节码编程bytebuddy之监控方法执行耗时 。
