What are the implementation methods of spring dynamic proxy?

The implementation of spring dynamic proxy: 1. JDK dynamic proxy; 2. CGLIB dynamic proxy. Detailed introduction: 1. JDK dynamic proxy uses the reflection mechanism of JDK. It requires that the proxy object must implement at least one interface. At runtime, Spring will obtain all the interfaces of the proxy object through the reflection mechanism, and then provide these interfaces. The interface creates an InvocationHandler object, which implements all interface methods and forwards all method calls to a Handler and so on.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

The Spring framework provides two types of proxies: JDK dynamic proxy and CGLIB dynamic proxy.

1. JDK dynamic proxy:

JDK dynamic proxy uses the reflection mechanism of JDK, which requires that the object being proxied must implement at least one interface. At runtime, Spring will obtain all interfaces of the proxied object through the reflection mechanism, and then create an InvocationHandler object for these interfaces. This object implements all interface methods and forwards all method calls to a Handler object. The Handler object contains all proxy logic. Therefore, to use JDK dynamic proxy, your class must implement at least one interface.

Sample code:

@Service  
public class MyServiceImpl implements MyService {  
    // 实现接口方法  
}  
  
@Component  
public class MyComponent {  
    @Autowired  
    private MyService myService;  
}

2. CGLIB dynamic proxy:

CGLIB dynamic proxy uses bytecode technology, which can be used at runtime Dynamically create a subclass and override methods that require a proxy. Therefore, using CGLIB dynamic proxy, your class does not need to implement any interface. If your class does not implement any interface, Spring will use CGLIB dynamic proxy to create the proxy object.

Sample code:

@Service  
public class MyServiceImpl {  
    // 实现业务逻辑  
}  
  
@Component  
public class MyComponent {  
    @Autowired  
    private MyService myService;  
}

In Spring, JDK dynamic proxy is used by default to create proxy objects. If you want Spring to use CGLIB dynamic proxies to create proxy objects, you can add the following configuration to your configuration file:

<aop:config proxy-target-class="true">  
    <!-- 其他配置 -->  
</aop:config>

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