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Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析!

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Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

編輯 | Java之間(gengecn)

來(lái)源 | tech.souyunku.com/?p=13107

在網(wǎng)上已經(jīng)有跟多Bean的生命周期的博客,但是很多都是基于比較老的版本了,最近吧整個(gè)流程化成了一個(gè)流程圖。待會(huì)兒使用流程圖,說(shuō)明以及代碼的形式來(lái)說(shuō)明整個(gè)聲明周期的流程。注意因?yàn)榇a比較多,這里的流程圖只畫(huà)出了大概的流程,具體的可以深入代碼

一、獲取Bea

Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

第一階段獲取Bean

這里的流程圖的入口在 AbstractBeanFactory類(lèi)的doGetBean方法,這里可以配合前面的 getBean方法分析文章進(jìn)行閱讀。主要流程就是

1、先處理Bean 的名稱(chēng),因?yàn)槿绻浴?”開(kāi)頭的Bean名稱(chēng)表示獲取的是對(duì)應(yīng)的FactoryBean對(duì)象;

2、從緩存中獲取單例Bean,有則進(jìn)一步判斷這個(gè)Bean是不是在創(chuàng)建中,如果是的就等待創(chuàng)建完畢,否則直接返回這個(gè)Bean對(duì)象

3、如果不存在單例Bean緩存,則先進(jìn)行循環(huán)依賴(lài)的解析

4、解析完畢之后先獲取父類(lèi)BeanFactory,獲取到了則調(diào)用父類(lèi)的getBean方法,不存在則先合并然后創(chuàng)建Bean

二、創(chuàng)建Bean

2.1 創(chuàng)建Bean之前

Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

在真正創(chuàng)建Bean之前邏輯

這個(gè)流程圖對(duì)應(yīng)的代碼在 AbstractAutowireCapableBeanFactory類(lèi)的createBean方法中。

1、這里會(huì)先獲取RootBeanDefinition對(duì)象中的Class對(duì)象并確保已經(jīng)關(guān)聯(lián)了要?jiǎng)?chuàng)建的Bean的Class 。整編:微信公眾號(hào),搜云庫(kù)技術(shù)團(tuán)隊(duì),ID:souyunku

2、這里會(huì)檢查3個(gè)條件

(1)Bean的屬性中的 beforeInstantiationResolved字段是否為true,默認(rèn)是false。

(2)Bean是原生的Bean

(3)Bean的 hasInstantiationAwareBeanPostProcessors屬性為true,這個(gè)屬性在Spring準(zhǔn)備刷新容器錢(qián)轉(zhuǎn)杯BeanPostProcessors的時(shí)候會(huì)設(shè)置,如果當(dāng)前Bean實(shí)現(xiàn)了InstantiationAwareBeanPostProcessor則這個(gè)就會(huì)是true。

當(dāng)三個(gè)條件都存在的時(shí)候,就會(huì)調(diào)用實(shí)現(xiàn)的 InstantiationAwareBeanPostProcessor接口的postProcessBeforeInstantiation方法,然后獲取返回的Bean,如果返回的Bean不是還會(huì)調(diào)用實(shí)現(xiàn)的BeanPostProcessor接口的postProcessAfterInitialization方法,這里用代碼說(shuō)明

  1. protected Object resolveBeforeInstantiation(String beanName, RootBeanDefinition mbd) {

  2. Object bean = ;

  3. //條件1

  4. if (!Boolean.FALSE.equals(mbd.beforeInstantiationResolved)) {

  5. //條件2跟條件3

  6. if (!mbd.isSynthetic && hasInstantiationAwareBeanPostProcessors) {

  7. Class targetType = determineTargetType(beanName, mbd);

  8. if (targetType != ) {

  9. //調(diào)用實(shí)現(xiàn)的postProcessBeforeInstantiation方法

  10. bean = applyBeanPostProcessorsBeforeInstantiation(targetType, beanName);

  11. if (bean != ) {

  12. //調(diào)用實(shí)現(xiàn)的postProcessAfterInitialization方法

  13. bean = applyBeanPostProcessorsAfterInitialization(bean, beanName);

  14. }

  15. }

  16. }

  17. //不滿足2或者3的時(shí)候就會(huì)設(shè)置為false

  18. mbd.beforeInstantiationResolved = (bean != );

  19. }

  20. return bean;

  21. }

1、如果上面3個(gè)條件其中一個(gè)不滿足就不會(huì)調(diào)用實(shí)現(xiàn)的方法。默認(rèn)這里都不會(huì)調(diào)用的這些BeanPostProcessors的實(shí)現(xiàn)方法。然后繼續(xù)執(zhí)行后面的doCreateBean方法。

2.1 真正的創(chuàng)建Bean,doCreateBean

Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

doCreateBean方法邏輯

這個(gè)代碼的實(shí)現(xiàn)還是在 AbstractAutowireCapableBeanFactory方法中。流程是

1、先檢查instanceWrapper變量是不是,這里一般是,除非當(dāng)前正在創(chuàng)建的Bean在factoryBeanInstanceCache中存在這個(gè)是保存還沒(méi)創(chuàng)建完成的FactoryBean的集合。

2、調(diào)用createBeanInstance方法實(shí)例化Bean,這個(gè)方法在后面會(huì)講解

3、如果當(dāng)前RootBeanDefinition對(duì)象還沒(méi)有調(diào)用過(guò)實(shí)現(xiàn)了的MergedBeanDefinitionPostProcessor接口的方法,則會(huì)進(jìn)行調(diào)用 。整編:微信公眾號(hào),搜云庫(kù)技術(shù)團(tuán)隊(duì),ID:souyunku

4、 當(dāng)滿足以下三點(diǎn)

(1)是單例Bean

(2)嘗試解析bean之間的循環(huán)引用

(3)bean目前正在創(chuàng)建中

則會(huì)進(jìn)一步檢查是否實(shí)現(xiàn)了 SmartInstantiationAwareBeanPostProcessor接口如果實(shí)現(xiàn)了則調(diào)用是實(shí)現(xiàn)的getEarlyBeanReference方法 5、 調(diào)用populateBean方法進(jìn)行屬性填充,這里后面會(huì)講解 6、 調(diào)用initializeBean方法對(duì)Bean進(jìn)行初始化,這里后面會(huì)講解

2.1.1 實(shí)例化Bean,createBeanInstance

Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

實(shí)例化Bean

這里的邏輯稍微有一點(diǎn)復(fù)雜,這個(gè)流程圖已經(jīng)是簡(jiǎn)化過(guò)后的了。簡(jiǎn)要根據(jù)代碼說(shuō)明一下流程

  1. protected BeanWrapper createBeanInstance(String beanName, RootBeanDefinition mbd, @ableObject[] args) {

  2. //步驟1

  3. Class beanClass = resolveBeanClass(mbd, beanName);


  4. if (beanClass != && !Modifier.isPublic(beanClass.getModifiers) && !mbd.isNonPublicAccessAllowed) {

  5. throw new BeanCreationException(mbd.getResourceDescription, beanName,

  6. "Bean class isn't public, and non-public access not allowed: "+ beanClass.getName);

  7. }

  8. //步驟2

  9. Supplier instanceSupplier = mbd.getInstanceSupplier;

  10. if (instanceSupplier != ) {

  11. return obtainFromSupplier(instanceSupplier, beanName);

  12. }

  13. //步驟3

  14. if (mbd.getFactoryMethodName != ) {

  15. return instantiateUsingFactoryMethod(beanName, mbd, args);

  16. }



  17. boolean resolved = false;

  18. boolean autowireNecessary = false;

  19. if (args == ) {

  20. synchronized (mbd.constructorArgumentLock) {

  21. if (mbd.resolvedConstructorOrFactoryMethod != ) {

  22. resolved = true;

  23. autowireNecessary = mbd.constructorArgumentsResolved;

  24. }

  25. }

  26. }

  27. //步驟4.1

  28. if (resolved) {


  29. if (autowireNecessary) {

  30. return autowireConstructor(beanName, mbd, , );

  31. }

  32. else {


  33. return instantiateBean(beanName, mbd);

  34. }

  35. }


  36. //步驟4.2

  37. Constructor ctors = determineConstructorsFromBeanPostProcessors(beanClass, beanName);

  38. if (ctors != || mbd.getResolvedAutowireMode == AUTOWIRE_CONSTRUCTOR ||

  39. mbd.hasConstructorArgumentValues || !ObjectUtils.isEmpty(args)) {

  40. return autowireConstructor(beanName, mbd, ctors, args);

  41. }


  42. //步驟5

  43. ctors = mbd.getPreferredConstructors;

  44. if (ctors != ) {

  45. return autowireConstructor(beanName, mbd, ctors, );

  46. }



  47. return instantiateBean(beanName, mbd);

  48. }

1、先檢查Class是否已經(jīng)關(guān)聯(lián)了,并且對(duì)應(yīng)的修飾符是否是public的

2、如果用戶(hù)定義了Bean實(shí)例化的函數(shù),則調(diào)用并返回

3、如果當(dāng)前Bean實(shí)現(xiàn)了FactoryBean接口則調(diào)用對(duì)應(yīng)的FactoryBean接口的getObject方法

4、根據(jù)getBean時(shí)候是否傳入構(gòu)造參數(shù)進(jìn)行處理

4.1如果沒(méi)有傳入構(gòu)造參數(shù),則檢查是否存在已經(jīng)緩存的無(wú)參構(gòu)造器,有則使用構(gòu)造器直接創(chuàng)建,沒(méi)有就會(huì)調(diào)用instantiateBean方法先獲取實(shí)例化的策略默認(rèn)是CglibSubclassingInstantiationStrategy,然后實(shí)例化Bean。最后返回

4.2如果傳入了構(gòu)造參數(shù),則會(huì)先檢查是否實(shí)現(xiàn)了SmartInstantiationAwareBeanPostProcessor接口,如果實(shí)現(xiàn)了會(huì)調(diào)用determineCandidateConstructors獲取返回的候選構(gòu)造器。整編:微信公眾號(hào),搜云庫(kù)技術(shù)團(tuán)隊(duì),ID:souyunku

4.3檢查4個(gè)條件是否滿足一個(gè)

(1)構(gòu)造器不為,

(2)從RootBeanDefinition中獲取到的關(guān)聯(lián)的注入方式是構(gòu)造器注入(沒(méi)有構(gòu)造參數(shù)就是setter注入,有則是構(gòu)造器注入)

(3)含有構(gòu)造參數(shù)

(4)getBean方法傳入構(gòu)造參數(shù)不是空

滿足其中一個(gè)則會(huì)調(diào)用返回的候選構(gòu)造器實(shí)例化Bean并返回,如果都不滿足,則會(huì)根據(jù)構(gòu)造參數(shù)選則合適的有參構(gòu)造器然后實(shí)例化Bean并返回

5、如果上面都沒(méi)有合適的構(gòu)造器,則直接使用無(wú)參構(gòu)造器創(chuàng)建并返回Bean。

2.1.2 填充Bean,populateBean

Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

填充Bean

這里還是根據(jù)代碼來(lái)說(shuō)一下流程

  1. protected void populateBean(String beanName, RootBeanDefinition mbd, @ableBeanWrapper bw) {

  2. if (bw == ) {

  3. if (mbd.hasPropertyValues) {

  4. throw new BeanCreationException(

  5. mbd.getResourceDescription, beanName, "Cannot apply property values to instance");

  6. }

  7. else {

  8. // Skip property population phase for instance.

  9. return;

  10. }

  11. }



  12. boolean continueWithPropertyPopulation = true;

  13. //步驟1

  14. if (!mbd.isSynthetic && hasInstantiationAwareBeanPostProcessors) {

  15. for (BeanPostProcessor bp : getBeanPostProcessors) {

  16. if (bp instanceof InstantiationAwareBeanPostProcessor) {

  17. InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp;

  18. if (!ibp.postProcessAfterInstantiation(bw.getWrappedInstance, beanName)) {

  19. continueWithPropertyPopulation = false;

  20. break;

  21. }

  22. }

  23. }

  24. }


  25. if (!continueWithPropertyPopulation) {

  26. return;

  27. }

  28. //步驟2--------------------

  29. PropertyValues pvs = (mbd.hasPropertyValues ? mbd.getPropertyValues : );


  30. int resolvedAutowireMode = mbd.getResolvedAutowireMode;

  31. if (resolvedAutowireMode == AUTOWIRE_BY_NAME || resolvedAutowireMode == AUTOWIRE_BY_TYPE) {

  32. MutablePropertyValues newPvs = new MutablePropertyValues(pvs);

  33. // Add property values based on autowire by name if applicable.

  34. if (resolvedAutowireMode == AUTOWIRE_BY_NAME) {

  35. autowireByName(beanName, mbd, bw, newPvs);

  36. }

  37. // Add property values based on autowire by type if applicable.

  38. if (resolvedAutowireMode == AUTOWIRE_BY_TYPE) {

  39. autowireByType(beanName, mbd, bw, newPvs);

  40. }

  41. pvs = newPvs;

  42. }


  43. boolean hasInstAwareBpps = hasInstantiationAwareBeanPostProcessors;

  44. boolean needsDepCheck = (mbd.getDependencyCheck != AbstractBeanDefinition.DEPENDENCY_CHECK_NONE);


  45. PropertyDescriptor filteredPds = ;

  46. //步驟3

  47. if (hasInstAwareBpps) {

  48. if (pvs == ) {

  49. pvs = mbd.getPropertyValues;

  50. }

  51. for (BeanPostProcessor bp : getBeanPostProcessors) {

  52. if (bp instanceof InstantiationAwareBeanPostProcessor) {

  53. InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp;

  54. PropertyValues pvsToUse = ibp.postProcessProperties(pvs, bw.getWrappedInstance, beanName);

  55. if (pvsToUse == ) {

  56. if (filteredPds == ) {

  57. filteredPds = filterPropertyDescriptorsForDependencyCheck(bw, mbd.allowCaching);

  58. }

  59. pvsToUse = ibp.postProcessPropertyValues(pvs, filteredPds, bw.getWrappedInstance, beanName);

  60. if (pvsToUse == ) {

  61. return;

  62. }

  63. }

  64. pvs = pvsToUse;

  65. }

  66. }

  67. }

  68. if (needsDepCheck) {

  69. if (filteredPds == ) {

  70. filteredPds = filterPropertyDescriptorsForDependencyCheck(bw, mbd.allowCaching);

  71. }

  72. checkDependencies(beanName, mbd, filteredPds, pvs);

  73. }

  74. //步驟4

  75. if (pvs != ) {

  76. applyPropertyValues(beanName, mbd, bw, pvs);

  77. }

  78. }

1、檢查當(dāng)前Bean是否實(shí)現(xiàn)了InstantiationAwareBeanPostProcessorpostProcessAfterInstantiation方法則調(diào)用,并結(jié)束B(niǎo)ean的填充。

2、將按照類(lèi)型跟按照名稱(chēng)注入的Bean分開(kāi),如果注入的Bean還沒(méi)有實(shí)例化的這里會(huì)實(shí)例化,然后放到PropertyValues對(duì)象中。

3、如果實(shí)現(xiàn)了InstantiationAwareBeanPostProcessor類(lèi)的postProcessProperties則調(diào)用這個(gè)方法并獲取返回值,如果返回值是,則有可能是實(shí)現(xiàn)了過(guò)期的postProcessPropertyValues方法,這里需要進(jìn)一步調(diào)用postProcessPropertyValues方法

4、進(jìn)行參數(shù)填充

2.1.3 初始化Bean,initializeBean

Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

初始化Bean

同時(shí)這里根據(jù)代碼跟流程圖來(lái)說(shuō)明

1、如果Bean實(shí)現(xiàn)了BeanNameAware,BeanClassLoaderAware,BeanFactoryAware則調(diào)用對(duì)應(yīng)實(shí)現(xiàn)的方法 。整編:微信公眾號(hào),搜云庫(kù)技術(shù)團(tuán)隊(duì),ID:souyunku

2、Bean不為并且bean不是合成的,如果實(shí)現(xiàn)了BeanPostProcessorpostProcessBeforeInitialization則會(huì)調(diào)用實(shí)現(xiàn)的postProcessBeforeInitialization方法。在ApplicationContextAwareProcessor類(lèi)中實(shí)現(xiàn)了postProcessBeforeInitialization方法。而這個(gè)類(lèi)會(huì)在Spring刷新容器準(zhǔn)備beanFactory的時(shí)候會(huì)加進(jìn)去,這里就會(huì)被調(diào)用,而調(diào)用里面會(huì)檢查Bean是不是EnvironmentAware,EmbeddedValueResolverAware,ResourceLoaderAware,ApplicationEventPublisherAware,MessageSourceAware,ApplicationContextAware的實(shí)現(xiàn)類(lèi)。這里就會(huì)調(diào)用對(duì)應(yīng)的實(shí)現(xiàn)方法。代碼如下

  1. protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {

  2. .......

  3. beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));

  4. .......

  1. public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {

  2. if (!(bean instanceof EnvironmentAware || bean instanceof EmbeddedValueResolverAware ||

  3. bean instanceof ResourceLoaderAware || bean instanceof ApplicationEventPublisherAware ||

  4. bean instanceof MessageSourceAware || bean instanceof ApplicationContextAware)){

  5. return bean;

  6. }


  7. AccessControlContext acc = ;


  8. if (System.getSecurityManager != ) {

  9. acc = this.applicationContext.getBeanFactory.getAccessControlContext;

  10. }


  11. if (acc != ) {

  12. AccessController.doPrivileged((PrivilegedAction) -> {

  13. invokeAwareInterfaces(bean);

  14. return ;

  15. }, acc);

  16. }

  17. else {

  18. invokeAwareInterfaces(bean);

  19. }


  20. return bean;

  21. }

  22. 1、實(shí)例化Bean然后,檢查是否實(shí)現(xiàn)了InitializingBeanafterPropertiesSet方法,如果實(shí)現(xiàn)了就會(huì)調(diào)用

    2、Bean不為并且bean不是合成的,如果實(shí)現(xiàn)了BeanPostProcessorpostProcessBeforeInitialization則會(huì)調(diào)用實(shí)現(xiàn)的postProcessAfterInitialization方法。

    到此創(chuàng)建Bean 的流程就沒(méi)了,剩下的就是容器銷(xiāo)毀的時(shí)候的了

    三、destory方法跟銷(xiāo)毀Bean

    歡迎關(guān)注公眾號(hào):Java后端

    Bean在創(chuàng)建完畢之后會(huì)檢查用戶(hù)是否指定了 destroyMethodName以及是否實(shí)現(xiàn)了DestructionAwareBeanPostProcessor接口的requiresDestruction方法,如果指定了會(huì)記錄下來(lái)保存在DisposableBeanAdapter對(duì)象中并保存在bean的disposableBeans屬性中。代碼在AbstractBeanFactoryregisterDisposableBeanIfNecessary

    1. protected void registerDisposableBeanIfNecessary(String beanName, Object bean, RootBeanDefinition mbd) {

    2. ......

    3. registerDisposableBean(beanName,

    4. new DisposableBeanAdapter(bean, beanName, mbd, getBeanPostProcessors, acc));

    5. ......

    6. }

    1. public DisposableBeanAdapter(Object bean, String beanName, RootBeanDefinition beanDefinition,

    2. List postProcessors, @ableAccessControlContext acc) {

    3. .......

    4. String destroyMethodName = inferDestroyMethodIfNecessary(bean, beanDefinition);

    5. if (destroyMethodName != && !(this.invokeDisposableBean && "destroy".equals(destroyMethodName)) &&

    6. !beanDefinition.isExternallyManagedDestroyMethod(destroyMethodName)) {

    7. ......

    8. this.destroyMethod = destroyMethod;

    9. }

    10. this.beanPostProcessors = filterPostProcessors(postProcessors, bean);

    11. }

    在銷(xiāo)毀Bean的時(shí)候最后都會(huì)調(diào)用 AbstractAutowireCapableBeanFactorydestroyBean方法。

    1. public void destroyBean(Object existingBean) {

    2. new DisposableBeanAdapter(existingBean, getBeanPostProcessors, getAccessControlContext).destroy;

    3. }

    這里是創(chuàng)建一個(gè) DisposableBeanAdapter對(duì)象,這個(gè)對(duì)象實(shí)現(xiàn)了Runnable接口,在實(shí)現(xiàn)的run方法中會(huì)調(diào)用實(shí)現(xiàn)的DisposableBean接口的destroy方法。并且在創(chuàng)建DisposableBeanAdapter對(duì)象的時(shí)候會(huì)根據(jù)傳入的bean是否實(shí)現(xiàn)了DisposableBean接口來(lái)設(shè)置invokeDisposableBean變量,這個(gè)變量表實(shí)有沒(méi)有實(shí)現(xiàn)DisposableBean接口

    1. public DisposableBeanAdapter(Object bean, List postProcessors, AccessControlContext acc) {

    2. Assert.not(bean, "Disposable bean must not be ");

    3. this.bean = bean;

    4. this.beanName = bean.getClass.getName;

    5. //根據(jù)傳入的bean是否實(shí)現(xiàn)了`DisposableBean`接口來(lái)設(shè)置`invokeDisposableBean`變量

    6. this.invokeDisposableBean = (this.bean instanceof DisposableBean);

    7. this.nonPublicAccessAllowed = true;

    8. this.acc = acc;

    9. this.beanPostProcessors = filterPostProcessors(postProcessors, bean);

    10. }


    11. public void destroy {

    12. ......

    13. //根據(jù)invokeDisposableBean決定是否調(diào)用destroy方法

    14. if (this.invokeDisposableBean) {

    15. if (logger.isTraceEnabled) {

    16. logger.trace("Invoking destroy on bean with name '"+ this.beanName +"'");

    17. }

    18. try {

    19. if (System.getSecurityManager != ) {

    20. AccessController.doPrivileged((PrivilegedExceptionAction) -> {

    21. ((DisposableBean) this.bean).destroy;

    22. return ;

    23. }, this.acc);

    24. }

    25. else {

    26. ((DisposableBean) this.bean).destroy;

    27. }

    28. }

    29. catch (Throwable ex) {

    30. String msg = "Invocation of destroy method failed on bean with name '"+ this.beanName +"'";

    31. if (logger.isDebugEnabled) {

    32. logger.warn(msg, ex);

    33. }

    34. else {

    35. logger.warn(msg + ": "+ ex);

    36. }

    37. }

    38. }

    39. ......

    40. }

    41. 四、總結(jié)。

      最后來(lái)一個(gè)大的流程

      Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

      實(shí)例化前的準(zhǔn)備階段

      Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

      實(shí)例化前

      Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

      實(shí)例化后

      Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

      初始化前

      Spring 的 Bean 生命周期,11 張高清流程圖及代碼,深度解析

      -END-

      (正文已結(jié)束)

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