Spring boot method interceptor
时间: 2023-11-27 21:49:03 浏览: 41
Spring Boot provides a way to intercept method calls using Method Interceptor. Method Interceptor allows you to intercept a method call before and after the method is called. This is useful when you want to add some additional behavior to a method, such as logging or security checks.
To create a method interceptor in Spring Boot, you need to create a class that implements the `MethodInterceptor` interface from the `org.aopalliance.intercept` package. This interface has two methods:
1. `Object invoke(MethodInvocation invocation) throws Throwable`: This method is called before and after the method is executed. The `MethodInvocation` object contains information about the method call and allows you to manipulate the method parameters and return value.
2. `MethodInterceptor getInterceptor()`: This method returns the actual interceptor that will be used to intercept the method call.
Here's an example of how to create a method interceptor in Spring Boot:
```java
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class LoggingInterceptor implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
System.out.println("Before method call: " + invocation.getMethod().getName());
Object result = invocation.proceed();
System.out.println("After method call: " + invocation.getMethod().getName());
return result;
}
}
```
In this example, the `LoggingInterceptor` class implements the `MethodInterceptor` interface and overrides the `invoke` method to log the method name before and after the actual method call. To use this interceptor, you need to configure it in your Spring Boot application context:
```java
import org.springframework.aop.framework.ProxyFactoryBean;
@Configuration
public class AppConfig {
@Bean
public LoggingInterceptor loggingInterceptor() {
return new LoggingInterceptor();
}
@Bean
public MyService myService() {
ProxyFactoryBean proxyFactoryBean = new ProxyFactoryBean();
proxyFactoryBean.setTarget(new MyServiceImpl());
proxyFactoryBean.setInterceptorNames("loggingInterceptor");
return (MyService) proxyFactoryBean.getObject();
}
}
```
In this example, the `loggingInterceptor` bean is created and configured to intercept method calls. The `MyService` bean is also created and configured to use the `loggingInterceptor` for method interception. When a method is called on the `MyService` bean, the `LoggingInterceptor` will intercept the method call and log the method name before and after the actual method call.
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