SpringBoot AOP使用筆記

更新時(shí)間：2019年01月30日 11:31:40 作者：裴星宙

今天小編就為大家分享一篇關(guān)于SpringBoot AOP使用筆記，小編覺(jué)得內(nèi)容挺不錯(cuò)的，現(xiàn)在分享給大家，具有很好的參考價(jià)值，需要的朋友一起跟隨小編來(lái)看看吧

1. 啟用AOP

a. 在類上添加@Aspect注解

b. 注入該類, 可以使用@Component進(jìn)行注入到Spring容器中

2. 通過(guò)PointCut對(duì)象創(chuàng)建切入點(diǎn)

a. 在某個(gè)方法使用類似下面的方法進(jìn)行注入

@Pointcut("execution(* com.sguess.service.IAOPService.*(..))")
  private void pointcut() {
  }

i. 其中,execution表達(dá)式為
execution(modifiers-pattern? ret-type-pattern declaring-type-pattern? name-pattern(param-pattern)throws-pattern?)
ii. 注意, pointcut()方法名是后面切入的時(shí)候需要使用的
iii. 方法內(nèi)可以什么也不寫(xiě), 寫(xiě)了也調(diào)不到
iv. 也可以創(chuàng)建多個(gè)PointCut,例如再創(chuàng)建一個(gè)

@Pointcut("execution(* com.sguess.service.IAOPService.fun1(..))")
    private void pointcut2() {
    }

這個(gè)的方法名就位pointcut2, 方法名不一樣.

b. 創(chuàng)建After方法,Before方法

@After(value = "pointcut()")
  public void doAfter() {
    System.out.println("Do AOP After function 01");
  }

i. After方法是指, 在配置了的切入點(diǎn)被執(zhí)行后, 執(zhí)行該方法.
ii. value中的pointcut() 是我們前面在創(chuàng)建@Pointcut中的方法名. 也就是說(shuō),是通過(guò)方法名和切入點(diǎn)進(jìn)行匹配的.
iii. 這個(gè)的方法名可以隨便起.
iv. Before方法同理

c. 帶Return的After方法,

@AfterReturning(returning = "str", pointcut = "pointcut()")
  public void doAfterReturning(String str) throws Exception {
    System.out.println("Return value is: " + str);
  }

i. AfterReturn是指在被切入的方法執(zhí)行后, 獲取其返回值, 再執(zhí)行該方法. 注意關(guān)鍵, 這個(gè)可以進(jìn)行操作返回值.
ii. returning = "str",是指, 假設(shè)切入方法的返回的值變量名為str
doAfterReturning(String str)方法的參數(shù)變量名必須和和returning保持一致, 這里也叫作str. 然后才能在方法體中使用.
iii. pointcut = "pointcut()"同樣是指前面聲明的pointcut方法名

3. 通過(guò)注解, 使用切入點(diǎn)

a. 監(jiān)聽(tīng)方法參數(shù)

@Before("execution(public int com.sguess.service.*(int, int))")
  public void beforMethod(JoinPoint point) {
    String methodName = point.getSignature().getName();
    List<Object> args = Arrays.asList(point.getArgs());
    System.out.println("Before FunctionName：" + methodName + ",ParameterName：" + args);
  }
  @After("execution(public int com.sguess.service.*(int, int))")
  public void afterMethod(JoinPoint point) {
    String methodName = point.getSignature().getName();
    List<Object> args = Arrays.asList(point.getArgs());
    System.out.println("After FunctionName：" + methodName + ",ParameterName：" + args);
  }

4. 執(zhí)行順序:

a.Around的方法優(yōu)先于Before/After執(zhí)行,After優(yōu)先于AfterReturn.

i. 代碼

@Before("execution(public int com.sguess.service.*.*(int, int))")
      public void beforMethod(JoinPoint point) {
        System.out.println("Before function");
      }
      @After("execution(public int com.sguess.service.*.*(int, int))")
      public void afterMethod(JoinPoint point) {
        System.out.println("After function");
      }
      @AfterReturning("execution(public int com.sguess.service.*.*(int, int))")
      public void afterReturnMethod(JoinPoint point) {
        System.out.println("AfterReturn function");
      }
      @AfterThrowing(value = "execution(public int com.sguess.service.*.*(int, int))", throwing = "e")
      public void afterReturningThrowing(JoinPoint point, Exception e) {
        System.out.println("AfterReturnThrowing function");
      }
      @Around("execution(public int com.sguess.service.*.*(int, int))")
      public Object aroundMethod(ProceedingJoinPoint pdj) {
        System.out.println("Start AroundFunction");
        Object result = null;
        try {
          System.out.println("Around process start");
          result = pdj.proceed();
          System.out.println("Around process end");
        } catch (Throwable e) {
          System.out.println("Around process exception");
        }
        System.out.println("After Around process");
        return result;
      }
    }

執(zhí)行結(jié)果:

Start AroundFunction
Around process start
Before function
Around process end
After Around process
After function
AfterReturn function

5.小結(jié):

  @AfterReturning(returning = "str", pointcut = "pointcut()")
  public void doAfterReturning(String str) throws Exception {
    System.out.println("Return value is: " + str);
  }
  @Before("execution(public int com.sguess.service.*.*(int, int))")
  public void beforMethod(JoinPoint point) {
    String methodName = point.getSignature().getName();
    List<Object> args = Arrays.asList(point.getArgs());
    System.out.println("Before FunctionName：" + methodName + ",ParameterName：" + args);
  }
  @After("execution(public int com.sguess.service.*.*(int, int))")
  public void afterMethod(JoinPoint point) {
    String methodName = point.getSignature().getName();
    List<Object> args = Arrays.asList(point.getArgs());
    System.out.println("After FunctionName：" + methodName + ",ParameterName：" + args);
  }
  @AfterThrowing(value = "execution(public int com.sguess.service.*.*(int, int))", throwing = "e")
  public void afterReturningThrowing(JoinPoint point, Exception e) {
    String methodName = point.getSignature().getName();
    List<Object> args = Arrays.asList(point.getArgs());
    System.out.println("AfterReturningThrowing FunctionName：" + methodName + ",ParameterName：" + args + ",Exception：" + e);
  }
  @Around("execution(public int com.sguess.service.*.*(int, int))")
  public Object aroundMethod(ProceedingJoinPoint pdj) {
      System.out.println("Start AroundFunction");
      Object result = null;
      try {
          System.out.println("Around process start");
          result = pdj.proceed();
          System.out.println("Around process end");
      } catch (Throwable e) {
          System.out.println("Around process exception");
      }
      System.out.println("After Around process");
      return result;
  }

總結(jié)

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