浅谈Spring静态切入点使用方法

旧城等待， 2022-06-16 12:56 100阅读 0赞

所谓[spring][]静态切入点，相对于动态切入点来说，具有良好的性能，因为静态切入点只在代理创建时候执行一次，而不是在运行期间，每次目标方法执行前都进行执行，下面，以实例说明如何定义静态切入点

看我我前一篇blog的朋友都知道，如果不定义切入点，通知方法是会对整个目标类的所有方法均进行切入的  
但实际需求中，我们可能对其中的几个方法执行A通知，对其他的方法执行B通知，这时候，就需要通过定义不同的切入点来进行区分

目标接口：

![None.gif][] package  StaticAdvisorTest;  
![None.gif][]  
![ExpandedBlockStart.gif][] public   interface  Shopping  \{  
![InBlock.gif][]  public String buySomething(String type);  
![InBlock.gif][]  public String buyAnything(String type);  
![InBlock.gif][]  public String sellSomething(String type);  
![InBlock.gif][]  public String sellAnything(String type);  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

javabean:

![None.gif][] package  StaticAdvisorTest;  
![None.gif][]  
![ExpandedBlockStart.gif][] public   class  Customer  \{  
![InBlock.gif][]  private String name;  
![InBlock.gif][]  private String age;  
![ExpandedSubBlockStart.gif][]  public Customer()\{  
![InBlock.gif][]        
![ExpandedSubBlockEnd.gif][]  \}  
![ExpandedSubBlockStart.gif][]  public Customer(String name,String age)\{  
![InBlock.gif][]      this.name=name;  
![InBlock.gif][]      this.age=age;  
![ExpandedSubBlockEnd.gif][]  \}  
![ExpandedSubBlockStart.gif][]public String getAge() \{  
![InBlock.gif][]    return age;  
![ExpandedSubBlockEnd.gif][]\}  
![ExpandedSubBlockStart.gif][]public void setAge(String age) \{  
![InBlock.gif][]    this.age = age;  
![ExpandedSubBlockEnd.gif][]\}  
![ExpandedSubBlockStart.gif][]public String getName() \{  
![InBlock.gif][]    return name;  
![ExpandedSubBlockEnd.gif][]\}  
![ExpandedSubBlockStart.gif][]public void setName(String name) \{  
![InBlock.gif][]    this.name = name;  
![ExpandedSubBlockEnd.gif][]\}  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

业务目标实现类：

![None.gif][] package  StaticAdvisorTest;  
![None.gif][]  
![ExpandedBlockStart.gif][] public   class  ShoppingImpl  implements  Shopping  \{  
![InBlock.gif][]    private Customer customer;  
![ExpandedSubBlockStart.gif][]    public Customer getCustomer() \{  
![InBlock.gif][]        return customer;  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedSubBlockStart.gif][]    public void setCustomer(Customer customer) \{  
![InBlock.gif][]        this.customer = customer;  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedSubBlockStart.gif][]    public String buySomething(String type) \{  
![InBlock.gif][]        System.out.println(this.getCustomer().getName()\+" bye "\+type\+" success");  
![InBlock.gif][]        return null;  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]      
![ExpandedSubBlockStart.gif][]    public String buyAnything(String type) \{  
![InBlock.gif][]       System.out.println(this.getCustomer().getName()\+" bye "\+type\+" success");  
![InBlock.gif][]       return null;  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]     \}  
![ExpandedSubBlockStart.gif][]    public String sellAnything(String type) \{  
![InBlock.gif][]        System.out.println(this.getCustomer().getName()\+" sell "\+type\+" success");  
![InBlock.gif][]        return null;  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedSubBlockStart.gif][]    public String sellSomething(String type) \{  
![InBlock.gif][]         System.out.println(this.getCustomer().getName()\+" sell "\+type\+" success");  
![InBlock.gif][]           return null;  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

通知（切面）方法：

![None.gif][] package  StaticAdvisorTest;  
![None.gif][]  
![None.gif][] import  java.lang.reflect.Method;  
![None.gif][]  
![None.gif][] import  org.springframework.aop.MethodBeforeAdvice;  
![None.gif][] // 前置通知   
![ExpandedBlockStart.gif][] public   class  WelcomeAdvice  implements  MethodBeforeAdvice  \{  
![InBlock.gif][]  
![InBlock.gif][]    public void before(Method method, Object\[\] args, Object obj)  
![ExpandedSubBlockStart.gif][]            throws Throwable \{  
![InBlock.gif][]        String type=(String)args\[0\];  
![InBlock.gif][]        System.out.println("Hello welcome to buy "\+type);  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

下面是重点，我们想对所有的buy方法进行通知处理，也就是在所有的buy方法上定义切面

spring为我们创建了静态切入点的父类 StaticMethodMatcherPointCut ,如果我们想实现自制的静态切入点，只要继承这个类就可以了，不过一般情况下，我们使用spring提供的静态切入点NameMatchMethodPointCut就足够了

配置文件如下：

![None.gif][] <? xml version="1.0" encoding="UTF-8" ?>   
![None.gif][] <! DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"  >   
![None.gif][] < beans >   
![None.gif][]  < bean  id ="customer"  class ="StaticAdvisorTest.Customer" >   
![None.gif][]    < constructor-arg  index ="0" >   
![None.gif][]      < value > gaoxiang </ value >   
![None.gif][]    </ constructor-arg >   
![None.gif][]     < constructor-arg  index ="1" >   
![None.gif][]      < value > 26 </ value >   
![None.gif][]    </ constructor-arg >   
![None.gif][]  </ bean >   
![None.gif][]  < bean  id ="shoppingImpl"  class ="StaticAdvisorTest.ShoppingImpl" >   
![None.gif][]    < property  name ="customer" >   
![None.gif][]      < ref  local ="customer" />   
![None.gif][]    </ property >   
![None.gif][]  </ bean >   
![None.gif][]    
![None.gif][] < bean  id ="shoppingAdvise"  class ="StaticAdvisorTest.WelcomeAdvice" ></ bean >   
![None.gif][]    
![None.gif][] < bean  id ="shoppingPointCutAdvisor"  class ="org.springframework.aop.support.NameMatchMethodPointcutAdvisor" >   
![None.gif][]   < property  name ="mappedName" >   
![None.gif][]     < value > sell\* </ value >   
![None.gif][]   </ property >   
![None.gif][]   < property  name ="advice" >   
![None.gif][]     < ref  bean ="shoppingAdvise" />   
![None.gif][]   </ property >   
![None.gif][] </ bean >   
![None.gif][]    
![None.gif][] < bean  id ="StaticAdvisorTest"  class ="org.springframework.aop.framework.ProxyFactoryBean" >   
![None.gif][]   < property  name ="proxyInterfaces" >   
![None.gif][]     < value > StaticAdvisorTest.Shopping </ value >   
![None.gif][]   </ property >   
![None.gif][]   < property  name ="interceptorNames" >   
![None.gif][]     < list >   
![None.gif][]       < value > shoppingPointCutAdvisor </ value >   
![None.gif][]     </ list >   
![None.gif][]   </ property >   
![None.gif][]   < property  name ="target" >   
![None.gif][]     < ref  bean ="shoppingImpl" />   
![None.gif][]   </ property >   
![None.gif][] </ bean >   
![None.gif][]  
![None.gif][] </ beans >   
![None.gif][]  
![None.gif][]

[测试][Link 1]程序：

![None.gif][] package  StaticAdvisorTest;  
![None.gif][]  
![None.gif][] import  java.io.File;  
![None.gif][]  
![None.gif][] import  org.springframework.beans.factory.BeanFactory;  
![None.gif][] import  org.springframework.beans.factory.xml.XmlBeanFactory;  
![None.gif][] import  org.springframework.core.io.FileSystemResource;  
![None.gif][]  
![None.gif][]  
![None.gif][]  
![ExpandedBlockStart.gif][] public   class  TestAdvisor  \{  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]    public static void main(String\[\] args) \{  
![InBlock.gif][]  
![InBlock.gif][]        String filePath=System.getProperty("user.dir")\+File.separator\+"StaticAdvisorTest"\+File.separator\+"hello.xml";  
![InBlock.gif][]          
![InBlock.gif][]        BeanFactory factory=new XmlBeanFactory(new FileSystemResource(filePath));  
![InBlock.gif][]          
![InBlock.gif][]        Shopping shopping=null;  
![InBlock.gif][]  
![InBlock.gif][]        shopping=(Shopping)factory.getBean("StaticAdvisorTest");  
![InBlock.gif][]        shopping.buySomething("something");  
![InBlock.gif][]        shopping.buyAnything("anything");  
![InBlock.gif][]        shopping.sellAnything("anything");  
![InBlock.gif][]        shopping.sellSomething("something");  
![InBlock.gif][]          
![InBlock.gif][]      
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

运行结果：

gaoxiang bye something success  
gaoxiang bye anything success  
Hello welcome to buy anything  
gaoxiang sell anything success  
Hello welcome to buy something  
gaoxiang sell something success

可以看到，为所有的sell开头的方法都进行了切面处理，而sell方法没有任何影响

转载地址：http://blog.csdn.net/daryl715/article/details/1618292

[spring]: http://lib.csdn.net/base/javaee
[None.gif]: /images/20220616/a981595f82f147e38268bc35d550e327.png
[ExpandedBlockStart.gif]: /images/20220616/18637579bc0646fe8883ae843ed9c8e8.png
[InBlock.gif]: /images/20220616/5822b19ecd6f4e51af0f3af1e9ab35ec.png
[ExpandedBlockEnd.gif]: /images/20220616/bee82d8d088f4cbf818ea99d498ed00b.png
[ExpandedSubBlockStart.gif]: /images/20220616/fd2bbbd8af84451eb36ae2fb9d665d00.png
[ExpandedSubBlockEnd.gif]: /images/20220616/1377f5436a274893a63e2779672b9613.png
[Link 1]: http://lib.csdn.net/base/softwaretest