Spring Boot Application AOP

# Spring Boot Application AOP One, adding dependencies in the POM

<dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-aop</artifactId></dependency>

Second, the target class

@RestControllerpublic class StudentController {    @GetMapping(value = "/aoptest")    public String aopTest(){        return " AOP test success!";    }}

Third, Slice class

The code examples are as follows:

@Aspect @configurationpublic class Httpaspect {//Use Org.slf4j.Logger, which is the way spring implements the log private final static Logger Logg    ER = Loggerfactory.getlogger (httpaspect.class); /** * Define the AOP scan path */@Pointcut ("Execution (Public * com.example.myproject.controller.studentcontroller.* ())") pub        LIC void log () {}/** * logs the log at the beginning of the HTTP request */@Before ("log ()") public void Dobefore (Joinpoint joinpoint) {        Servletrequestattributes attributes = (servletrequestattributes) requestcontextholder.getrequestattributes ();        HttpServletRequest request = Attributes.getrequest ();        URL logger.info ("url={}", Request.getrequesturi ());        Method Logger.info ("method={}", Request.getmethod ());        IP logger.info ("ip={}", Request.getremoteaddr ()); Class method Logger.info ("class={} and Method name = {}", Joinpoint.getsignature (). Getdeclaringtypename (), Joinpoint.getsi        Gnature (). GetName ()); Parameter Logger.info ("parameter ={}", Joinpoint.Getargs ()); }/** * Logs the log at the end of the HTTP request */@After ("log ()") public void Doafter () {servletrequestattributes attribute        s = (servletrequestattributes) requestcontextholder.getrequestattributes ();        HttpServletRequest request = Attributes.getrequest ();    Logger.info ("url = {} End of execution", Request.getrequesturl ()); }/** * Gets the contents of the return * * @param object */@AfterReturning (returning = "Object", Pointcut = "log ()") public    void Doafterreturn (Object object) {Logger.info ("response={}", object.tostring ()); }}

PS: Spring aop.xml <aop:config> The connection between the target object, the Pointcut, etc. is configured through the. The sample configuration is as follows:

<aop:config>    <aop:aspect id="log" ref="HttpAspect">        <aop:pointcut id="printLog" expression="execution(* com.example.myproject.controller.StudentController.*())" />        <aop:before method="doBefore" pointcut-ref="printLog" />        <aop:after method="doAfter" pointcut-ref="printLog" />    </aop:aspect></aop:config>

• Annotation Interpretation

  • @Aspect: Describes a slice class.
  • @Configuration: Describes a configuration class.
  • @Pointcut: Declare a pointcut that determines what the connection points are interested in, and controls when notifications are executed.
  • @Before: A front-facing notification. A notification that is executed before a connection point, but this notification does not block the execution process before the connection point (unless it throws an exception).
  • @AfterFinal Notice. The notification that is executed when a connection point exits (whether it is a normal return or an abnormal exit).
  • @AfterReturning: Post notification. A notification that is executed when a connection point is completed normally, usually when a matching method returns.

• Pointcut expression

  The format is as follows:

  execution([可见性] 返回类型 [声明类型].方法名(参数) [异常])

  • []: Indicates optional.

  Wildcard characters:

  • *: matches all characters.
  • ..: Typically used to match multiple packages, multiple parameters.
  • +: Represents a class and its subclasses.

Operators: && , || ,!

Iv. Start-up class

@SpringBootApplicationpublic class MyprojectApplication extends SpringBootServletInitializer {    @Override    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {        return application.sources(MyprojectApplication.class);    }    public static void main(String[] args) {        SpringApplication.run(MyprojectApplication.class, args);    }}

PS: The spring-boot default is to start the package of the class as the root path, scanning the current package and the child package.

Spring Boot Application AOP