方法

在Ruby中，调用方法时是可以省略()的

1
2

>> print("Hello world")				#=>Hello world
>> print "Hello world"				#=>Hello world

带块的方法
带块的方法如time,each方法，其语法如下：

对象.方法名(参数，...) do |变量1，...|
    块内容
end

Ruby中方法可归为3类：

循环

对于任何一种程序设计语言，都有循环处理的方法，Ruby也一样，但是在Ruby中有两种实现循环的方法。

• 使用循环语句，即利用Ruby提供的现有循环语句
• 使用方法实现循环，其具体做法为，将块传给方法，然后在块里面写上需要循环的处理。

在Ruby中，有6种循环语句或方法：

在Ruby中任何表现数据的基本单位都称为对象(object), 而Ruby的类(class)表示的就是这些对象的种类。

变量

和其他面向对象语言一样，Ruby也有多种类型的变量，但是在Ruby中，变量的类型是由变量的命名方式决定的。

局部变量(local variable)
以英文字母或者_开头

1
2

words = "Hello Ruby"
_words = "Hello Ruby"

数组

Ruby中数组的大小是按实际情况自动调整的，即所谓的动态数组

1
2
3

>> rubyArray = ["data1", "data2"]   ##定义两个数据的数组
>> rubyArray[2] = "data3"           ##新增第三个数据
>> print rubyArray                  ##打印["data1", "data2", "data3"]

Ruby数组还支持多种不同对象的混合保存, 通过数组.size可获取数组的大小

1
2

>> mixedArray = [1, "data", 2, "time", 3]
>> mixedArray.size     #=> 5

特点

脚本语言
即动态语言，和其他脚本语言一样，无需编译即可直接运行，而C#、C++和Java等需要通过编译然后才能运行。Ruby减少了开发者的开发流程。

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.

• aspectjrt.jar
• aspectjweaver.jar
• aopalliance.jar

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.

Let’s first to see the three very technical terms as below.

• Adivce - Indicate the action to take either before or after the method execution.
• Pointcut - Indicate which method should be intercept, by method name or regular expression pattern.
• Advisor - Group ‘Advice’ and ‘Pointcut’ into a single unit, and pass it to a proxy factory object