Spring_IOC / AOP comment

A, IOC comment

　　1. Spring for injecting into bean container:

@Component: injecting into Spring bean container
@Repository: a label layer Dao
@Service: Service label for the business layer
@Controller: a controller class label

　　2. for obtaining data to achieve fitting assembly Bean

@Autowired: ByType default mode, if the class of the same name appears, it is not required in accordance with Type implanting ID specified @Qualifier
. @ Resource: default ByName way, if the name does default in accordance with the injection ByType way

　　Case of IOC comment

　　　　(1) Large package annotations added profile scanner, package

 <context:component-scan base-package="cn.spring.aop"/>

　　　　　　　　　base-package is filled in the package name, package names with a plurality of ',' to distinguish

　　　　(2) The definition and implementation class corresponding interface

@Repository("mapperImpl")
public class MapperImpl implements Mapper {
    @Override
    public int add(StudentBean stu) {
        System.out.println("123");
        return 0;
    }
}

@Service("StuServiceImpl")
public class StuServiceImpl implements StuService {
    @Resource
    private Mapper mapper;
    @Override
    public int add(StudentBean stu) {
        return mapper.add(stu);
    }
}

　　　　(3) Test Class

@Test
    public  void IocTestBy(){
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        StuService stuServiceImpl = (StuService)context.getBean("StuServiceImpl");
        stuServiceImpl.add(new StudentBean());
    }

Two, AOP notes Jane Shao

@Aspect: Statement section
@Ponitcut: public statement tangent point expression
@Before: Front enhanced
@AfterReturning: Rear enhanced
@Around: Enhanced Surround
@AfterThrowing: Enhanced exception is thrown
@After: ultimately enhance

　　Example: Notes achieve a variety of enhancements

　　　　(1) Large configuration file open aop comment

 <aop:aspectj-autoproxy/>

　　　　(2) interface

@Service("aopServices")
public class AopServices{
    public void doSome() throws Exception{
      /* int i=1/0;*/
        System.out.println("Service层业务");
    }
}

　　　　(3) Enhanced Class

@Aspect 
@Component 
public class Advices { 
    // set pointcut expression 
    @Pointcut ( "Execution (AOP .. * *. *. * (..))") 
    public void Pointcut () { 

    } 

    // front reinforcing 
    @Before ( "Pointcut ()") 
    public void before () { 
        System.out.println ( "front ========= ======="); 
    } 

    // rear reinforcing 
    @ afterReturning ( "Pointcut ()") 
    public void the afterReturning () { 
        System.out.println ( "rear ======= =========="); 
    } 

    // surround enhancement 
    @Around ( "Pointcut ()") 
    public Object Around (JP ProceedingJoinPoint) throws the Throwable {
 
        System.out.println ( "surround front ======= ==========");
        = Jp.proceed the proceed Object (); 
        System.out.println ( "surround rear ======= =========="); 
        return the proceed; 
    } 

    // abnormal enhancement of 
    @AfterThrowing (pointcut = "Execution (.. .. AOP * * * * (..))", the throwing = "EX") 
    public void AfterThrowing (exception EX) { 
        System.out.println ( "abnormal"); 
    } 

    // final enhanced 
    @After ( "Pointcut ()") 
    public void the After () { 
        System.out.println ( "final by ========= ======="); 
    } 
}

　　　　(4) Test Class

public class AopTest {
    public static void main(String[] args) {
        ApplicationContext context=new ClassPathXmlApplicationContext("applicaton.xml");
        AopServices aopServices = (AopServices)context.getBean("aopServices");
        try {
            aopServices.doSome();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}