Ruby的类
和其他面向对象语言一样,Ruby的类也表示对象的种类。通过class方法可以知道某个对象属于哪个类。
1 | "hello".class #=> String |
判断某个对象时候属于某个类时,可以使用**instance_of?**方法
1 | "hello".instance_of?(String) #=> true |
The HttpClient is library which is support by apache. It can post or get data from specific webservice and represents only the most basic contract for HTTP request execution.
We explain how to use this library with a example. In this example, we are going to use it to access the google tranlated API. Translating some text from specific language to other language. And this example using the Spring framework and Maven tool to build.
In this article, we introduce how to use AOP with the @AspectJ Annotation. If we want to use this Annotation. we should include below code in the XML schema-based configuration file.
1 | <aop:aspectj-autoproxy/> |
And also you need to add these libraries to your project, aspectjrt.jar, aspectjweaver.jar, aspectj.jar and aopalliance.jar.
Previously, we created AOP with Spring framework via implementing interface of spring AOP. And now we can use XML Schema to achieve it. We need to add below AspectJ libraries to our project. So downloading and adding them to the CLASSPATH of application, and also we can use the maven to build our application.
If we want to intercept methods with dynamic pointcut, we need to override matches and getClassFilter methods of DynamicMethodMatcher abstract class. The dynamic pointcut can verify the arguments of the method at runtime. This is a difference with static pointcut.