小編給大家分享一下SpringBoot AOP怎么用,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
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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, 寫了也調(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; }
以上是“SpringBoot AOP怎么用”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內(nèi)容對(duì)大家有所幫助,如果還想學(xué)習(xí)更多知識(shí),歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道!
文章名稱:SpringBootAOP怎么用
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