Spring框架之一 读取配置文件
以下代码都是来源于官方源码(Spring-4.3.18.RELEASE)，此处只是为自己以后深啃先布局出大概流程，请各看官不要浪费时间看
说明: .. 表示省略代码， // 后的如果不是源码自带则为当时DEBUG时的值
文件spring-config.xml内容
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="myHelloWorld" class="HelloWorld"> <property name="name" value="Spring"></property> </bean> </beans>
HelloWorld.java
public class HelloWorld { private String name ; public HelloWorld(){ System.out.println("create helloworld class"); } public void setName(String name){ this.name = name ; System.out.println("set name is:" + name); } public void sayHello(){ System.out.print("Hello " + name); } }
由主入口开始:
public class Main { public static void main(String[] args){ ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml"); HelloWorld tt = (HelloWorld)context.getBean("myHelloWorld") ; tt.sayHello(); } }
1. ClassPathXmlApplicationContext("spring-config.xml")
继承体系:
AbstractApplicationContext extends DefaultResourceLoader implements ConfigurableApplicationContext, DisposableBean
|
AbstractRefreshableApplicationContext extends AbstractApplicationContext
|
AbstractRefreshableConfigApplicationContext extends AbstractRefreshableApplicationContext implements BeanNameAware, InitializingBean
|
AbstractXmlApplicationContext extends AbstractRefreshableConfigApplicationContext
|
ClassPathXmlApplicationContext extends AbstractXmlApplicationContext
=> ClassPathXmlApplicationContext.class
public ClassPathXmlApplicationContext(String configLocation) throws BeansException { // configLocation = spring-config.xml
this(new String[]{configLocation}, true, (ApplicationContext)null); }
public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh, ApplicationContext parent) throws BeansException { super(parent); // parent : null this.setConfigLocations(configLocations); if (refresh) { // refresh: true this.refresh(); } }
=> AbstractApplicationContext.class
public void refresh() throws BeansException, IllegalStateException { Object var1 = this.startupShutdownMonitor; synchronized(this.startupShutdownMonitor) { this.prepareRefresh(); ConfigurableListableBeanFactory beanFactory = this.obtainFreshBeanFactory(); this.prepareBeanFactory(beanFactory); try { this.postProcessBeanFactory(beanFactory); this.invokeBeanFactoryPostProcessors(beanFactory); this.registerBeanPostProcessors(beanFactory); this.initMessageSource(); this.initApplicationEventMulticaster(); this.onRefresh(); this.registerListeners();
this.finishBeanFactoryInitialization(beanFactory); // org.springframework.beans.factory.support.DefaultListableBeanFactory@5e0826e7: defining beans [myHelloWorld]; root of factory hierarchy
this.finishRefresh(); } catch (BeansException var9) { if (this.logger.isWarnEnabled()) { this.logger.warn("Exception encountered during context initialization - cancelling refresh attempt: " + var9); } this.destroyBeans(); this.cancelRefresh(var9); throw var9; } finally { this.resetCommonCaches(); } } } protected void finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory) { if (beanFactory.containsBean("conversionService") && beanFactory.isTypeMatch("conversionService", ConversionService.class)) { beanFactory.setConversionService((ConversionService)beanFactory.getBean("conversionService", ConversionService.class)); } if (!beanFactory.hasEmbeddedValueResolver()) { beanFactory.addEmbeddedValueResolver(new StringValueResolver() { public String resolveStringValue(String strVal) { return AbstractApplicationContext.this.getEnvironment().resolvePlaceholders(strVal); } }); } String[] weaverAwareNames = beanFactory.getBeanNamesForType(LoadTimeWeaverAware.class, false, false); String[] var3 = weaverAwareNames; int var4 = weaverAwareNames.length; for(int var5 = 0; var5 < var4; ++var5) { String weaverAwareName = var3[var5]; this.getBean(weaverAwareName); } beanFactory.setTempClassLoader((ClassLoader)null); beanFactory.freezeConfiguration(); beanFactory.preInstantiateSingletons(); }
=> DefaultListableBeanFactory.class
public void preInstantiateSingletons() throws BeansException { if (this.logger.isDebugEnabled()) { this.logger.debug("Pre-instantiating singletons in " + this); } List<String> beanNames = new ArrayList(this.beanDefinitionNames); // beanDefinitionNames: size = 1 Iterator var2 = beanNames.iterator(); while(true) { while(true) { String beanName; // beanName: "myHelloWorld" RootBeanDefinition bd; do { do { do { if (!var2.hasNext()) { var2 = beanNames.iterator(); while(var2.hasNext()) { beanName = (String)var2.next(); Object singletonInstance = this.getSingleton(beanName); if (singletonInstance instanceof SmartInitializingSingleton) { final SmartInitializingSingleton smartSingleton = (SmartInitializingSingleton)singletonInstance; if (System.getSecurityManager() != null) { AccessController.doPrivileged(new PrivilegedAction<Object>() { public Object run() { smartSingleton.afterSingletonsInstantiated(); return null; } }, this.getAccessControlContext()); } else { smartSingleton.afterSingletonsInstantiated(); } } } return; } beanName = (String)var2.next(); bd = this.getMergedLocalBeanDefinition(beanName); } while(bd.isAbstract()); } while(!bd.isSingleton()); } while(bd.isLazyInit()); if (this.isFactoryBean(beanName)) { final FactoryBean<?> factory = (FactoryBean)this.getBean("&" + beanName); boolean isEagerInit; if (System.getSecurityManager() != null && factory instanceof SmartFactoryBean) { isEagerInit = (Boolean)AccessController.doPrivileged(new PrivilegedAction<Boolean>() { public Boolean run() { return ((SmartFactoryBean)factory).isEagerInit(); } }, this.getAccessControlContext()); } else { isEagerInit = factory instanceof SmartFactoryBean && ((SmartFactoryBean)factory).isEagerInit(); } if (isEagerInit) { this.getBean(beanName); } } else { this.getBean(beanName); // beanName : "myHelloWorld" } } } }
=> AbstractBeanFactory.class
public Object getBean(String name) throws BeansException { return this.doGetBean(name, (Class)null, (Object[])null, false); // name: "myHelloWorld" } protected <T> T doGetBean(String name, Class<T> requiredType, final Object[] args, boolean typeCheckOnly) throws BeansException { final String beanName = this.transformedBeanName(name); // name: "myHelloWorld" Object sharedInstance = this.getSingleton(beanName); // sharedInstance: null Object bean; if (sharedInstance != null && args == null) { if (this.logger.isDebugEnabled()) { if (this.isSingletonCurrentlyInCreation(beanName)) { this.logger.debug("Returning eagerly cached instance of singleton bean '" + beanName + "' that is not fully initialized yet - a consequence of a circular reference"); } else { this.logger.debug("Returning cached instance of singleton bean '" + beanName + "'"); } } bean = this.getObjectForBeanInstance(sharedInstance, name, beanName, (RootBeanDefinition)null); } else { if (this.isPrototypeCurrentlyInCreation(beanName)) { throw new BeanCurrentlyInCreationException(beanName); } BeanFactory parentBeanFactory = this.getParentBeanFactory(); // parentBeanFactory: null if (parentBeanFactory != null && !this.containsBeanDefinition(beanName)) { String nameToLookup = this.originalBeanName(name); // name: "myHelloWorld" if (args != null) { return parentBeanFactory.getBean(nameToLookup, args); } return parentBeanFactory.getBean(nameToLookup, requiredType); } if (!typeCheckOnly) { this.markBeanAsCreated(beanName); } try { final RootBeanDefinition mbd = this.getMergedLocalBeanDefinition(beanName); this.checkMergedBeanDefinition(mbd, beanName, args); String[] dependsOn = mbd.getDependsOn(); String[] var11; if (dependsOn != null) { var11 = dependsOn; int var12 = dependsOn.length; for(int var13 = 0; var13 < var12; ++var13) { String dep = var11[var13]; if (this.isDependent(beanName, dep)) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Circular depends-on relationship between '" + beanName + "' and '" + dep + "'"); } this.registerDependentBean(dep, beanName); try { this.getBean(dep); } catch (NoSuchBeanDefinitionException var24) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "'" + beanName + "' depends on missing bean '" + dep + "'", var24); } } } if (mbd.isSingleton()) { // mbd: Root bean: class [HelloWorld]; scope=singleton; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [spring-config.xml] sharedInstance = this.getSingleton(beanName, new ObjectFactory<Object>() { // 创建单实例,会跳到 DefaultSingletonBeanRegistry.class public Object getObject() throws BeansException { try { return AbstractBeanFactory.this.createBean(beanName, mbd, args); } catch (BeansException var2) { AbstractBeanFactory.this.destroySingleton(beanName); throw var2; } } }); bean = this.getObjectForBeanInstance(sharedInstance, name, beanName, mbd); } else if (mbd.isPrototype()) { var11 = null; Object prototypeInstance; try { this.beforePrototypeCreation(beanName); prototypeInstance = this.createBean(beanName, mbd, args); } finally { this.afterPrototypeCreation(beanName); } bean = this.getObjectForBeanInstance(prototypeInstance, name, beanName, mbd); } else { String scopeName = mbd.getScope(); Scope scope = (Scope)this.scopes.get(scopeName); if (scope == null) { throw new IllegalStateException("No Scope registered for scope name '" + scopeName + "'"); } try { Object scopedInstance = scope.get(beanName, new ObjectFactory<Object>() { public Object getObject() throws BeansException { AbstractBeanFactory.this.beforePrototypeCreation(beanName); Object var1; try { var1 = AbstractBeanFactory.this.createBean(beanName, mbd, args); } finally { AbstractBeanFactory.this.afterPrototypeCreation(beanName); } return var1; } }); bean = this.getObjectForBeanInstance(scopedInstance, name, beanName, mbd); } catch (IllegalStateException var23) { throw new BeanCreationException(beanName, "Scope '" + scopeName + "' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton", var23); } } } catch (BeansException var26) { this.cleanupAfterBeanCreationFailure(beanName); throw var26; } } if (requiredType != null && bean != null && !requiredType.isInstance(bean)) { try { return this.getTypeConverter().convertIfNecessary(bean, requiredType); } catch (TypeMismatchException var25) { if (this.logger.isDebugEnabled()) { this.logger.debug("Failed to convert bean '" + name + "' to required type '" + ClassUtils.getQualifiedName(requiredType) + "'", var25); } throw new BeanNotOfRequiredTypeException(name, requiredType, bean.getClass()); } } else { return bean; } }
=> AbstractAutowireCapableBeanFactory.class
// beanName: myHelloWorld // mbd: Root bean: class [HelloWorld]; scope=singleton; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [spring-config.xml] // args: null protected Object createBean(String beanName, RootBeanDefinition mbd, Object[] args) throws BeanCreationException { if (this.logger.isDebugEnabled()) { this.logger.debug("Creating instance of bean '" + beanName + "'"); } RootBeanDefinition mbdToUse = mbd; Class<?> resolvedClass = this.resolveBeanClass(mbd, beanName, new Class[0]); // resolvedClass: class HelloWorld if (resolvedClass != null && !mbd.hasBeanClass() && mbd.getBeanClassName() != null) { mbdToUse = new RootBeanDefinition(mbd); mbdToUse.setBeanClass(resolvedClass); } try { mbdToUse.prepareMethodOverrides(); } catch (BeanDefinitionValidationException var7) { throw new BeanDefinitionStoreException(mbdToUse.getResourceDescription(), beanName, "Validation of method overrides failed", var7); } Object beanInstance; try { beanInstance = this.resolveBeforeInstantiation(beanName, mbdToUse); if (beanInstance != null) { return beanInstance; } } catch (Throwable var8) { throw new BeanCreationException(mbdToUse.getResourceDescription(), beanName, "BeanPostProcessor before instantiation of bean failed", var8); } // beanName: myHelloWorld // mbdToUse: Root bean: class [HelloWorld]; scope=singleton; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [spring-config.xml] beanInstance = this.doCreateBean(beanName, mbdToUse, args); if (this.logger.isDebugEnabled()) { this.logger.debug("Finished creating instance of bean '" + beanName + "'"); } return beanInstance; } protected Object doCreateBean(final String beanName, final RootBeanDefinition mbd, Object[] args) throws BeanCreationException { BeanWrapper instanceWrapper = null; if (mbd.isSingleton()) { instanceWrapper = (BeanWrapper)this.factoryBeanInstanceCache.remove(beanName); } if (instanceWrapper == null) { instanceWrapper = this.createBeanInstance(beanName, mbd, args); } final Object bean = instanceWrapper != null ? instanceWrapper.getWrappedInstance() : null; // bean: HelloWorld@1531 Class<?> beanType = instanceWrapper != null ? instanceWrapper.getWrappedClass() : null; // beanType: class HelloWorld mbd.resolvedTargetType = beanType; Object var7 = mbd.postProcessingLock; synchronized(mbd.postProcessingLock) { if (!mbd.postProcessed) { try { this.applyMergedBeanDefinitionPostProcessors(mbd, beanType, beanName); } catch (Throwable var17) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Post-processing of merged bean definition failed", var17); } mbd.postProcessed = true; } } boolean earlySingletonExposure = mbd.isSingleton() && this.allowCircularReferences && this.isSingletonCurrentlyInCreation(beanName); if (earlySingletonExposure) { // earlySingletonExposure: true if (this.logger.isDebugEnabled()) { this.logger.debug("Eagerly caching bean '" + beanName + "' to allow for resolving potential circular references"); } this.addSingletonFactory(beanName, new ObjectFactory<Object>() { public Object getObject() throws BeansException { return AbstractAutowireCapableBeanFactory.this.getEarlyBeanReference(beanName, mbd, bean); } }); } Object exposedObject = bean; try { // beanName: myHelloWorld // mbd: Root bean: class [HelloWorld]; scope=singleton; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in class path resource [spring-config.xml] // instanceWrapper: org.springframework.beans.BeanWrapperImpl: wrapping object [HelloWorld@1190200a] this.populateBean(beanName, mbd, instanceWrapper); if (exposedObject != null) { exposedObject = this.initializeBean(beanName, exposedObject, mbd); } } catch (Throwable var18) { if (var18 instanceof BeanCreationException && beanName.equals(((BeanCreationException)var18).getBeanName())) { throw (BeanCreationException)var18; } throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Initialization of bean failed", var18); } if (earlySingletonExposure) { Object earlySingletonReference = this.getSingleton(beanName, false); if (earlySingletonReference != null) { if (exposedObject == bean) { exposedObject = earlySingletonReference; } else if (!this.allowRawInjectionDespiteWrapping && this.hasDependentBean(beanName)) { String[] dependentBeans = this.getDependentBeans(beanName); Set<String> actualDependentBeans = new LinkedHashSet(dependentBeans.length); String[] var12 = dependentBeans; int var13 = dependentBeans.length; for(int var14 = 0; var14 < var13; ++var14) { String dependentBean = var12[var14]; if (!this.removeSingletonIfCreatedForTypeCheckOnly(dependentBean)) { actualDependentBeans.add(dependentBean); } } if (!actualDependentBeans.isEmpty()) { throw new BeanCurrentlyInCreationException(beanName, "Bean with name '" + beanName + "' has been injected into other beans [" + StringUtils.collectionToCommaDelimitedString(actualDependentBeans) + "] in its raw version as part of a circular reference, but has eventually been wrapped. This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching - consider using 'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example."); } } } } try { this.registerDisposableBeanIfNecessary(beanName, bean, mbd); return exposedObject; } catch (BeanDefinitionValidationException var16) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Invalid destruction signature", var16); } } protected void populateBean(String beanName, RootBeanDefinition mbd, BeanWrapper bw) { PropertyValues pvs = mbd.getPropertyValues(); // pvs: PropertyValues: length=1; bean property 'name' if (bw == null) { if (!((PropertyValues)pvs).isEmpty()) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Cannot apply property values to null instance"); } } else { boolean continueWithPropertyPopulation = true; if (!mbd.isSynthetic() && this.hasInstantiationAwareBeanPostProcessors()) { Iterator var6 = this.getBeanPostProcessors().iterator(); while(var6.hasNext()) { BeanPostProcessor bp = (BeanPostProcessor)var6.next(); if (bp instanceof InstantiationAwareBeanPostProcessor) { InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor)bp; if (!ibp.postProcessAfterInstantiation(bw.getWrappedInstance(), beanName)) { continueWithPropertyPopulation = false; break; } } } } if (continueWithPropertyPopulation) { if (mbd.getResolvedAutowireMode() == 1 || mbd.getResolvedAutowireMode() == 2) { MutablePropertyValues newPvs = new MutablePropertyValues((PropertyValues)pvs); if (mbd.getResolvedAutowireMode() == 1) { this.autowireByName(beanName, mbd, bw, newPvs); } if (mbd.getResolvedAutowireMode() == 2) { this.autowireByType(beanName, mbd, bw, newPvs); } pvs = newPvs; } boolean hasInstAwareBpps = this.hasInstantiationAwareBeanPostProcessors(); boolean needsDepCheck = mbd.getDependencyCheck() != 0; if (hasInstAwareBpps || needsDepCheck) { PropertyDescriptor[] filteredPds = this.filterPropertyDescriptorsForDependencyCheck(bw, mbd.allowCaching); if (hasInstAwareBpps) { Iterator var9 = this.getBeanPostProcessors().iterator(); while(var9.hasNext()) { BeanPostProcessor bp = (BeanPostProcessor)var9.next(); if (bp instanceof InstantiationAwareBeanPostProcessor) { InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor)bp; pvs = ibp.postProcessPropertyValues((PropertyValues)pvs, filteredPds, bw.getWrappedInstance(), beanName); if (pvs == null) { return; } } } } if (needsDepCheck) { this.checkDependencies(beanName, mbd, filteredPds, (PropertyValues)pvs); } } this.applyPropertyValues(beanName, mbd, bw, (PropertyValues)pvs); } } } protected void applyPropertyValues(String beanName, BeanDefinition mbd, BeanWrapper bw, PropertyValues pvs) { if (pvs != null && !pvs.isEmpty()) { if (System.getSecurityManager() != null && bw instanceof BeanWrapperImpl) { ((BeanWrapperImpl)bw).setSecurityContext(this.getAccessControlContext()); } MutablePropertyValues mpvs = null; List original; if (pvs instanceof MutablePropertyValues) { mpvs = (MutablePropertyValues)pvs; if (mpvs.isConverted()) { try { bw.setPropertyValues(mpvs); return; } catch (BeansException var18) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Error setting property values", var18); } } original = mpvs.getPropertyValueList(); } else { original = Arrays.asList(pvs.getPropertyValues()); } TypeConverter converter = this.getCustomTypeConverter(); if (converter == null) { converter = bw; } BeanDefinitionValueResolver valueResolver = new BeanDefinitionValueResolver(this, beanName, mbd, (TypeConverter)converter); List<PropertyValue> deepCopy = new ArrayList(original.size()); boolean resolveNecessary = false; Iterator var11 = original.iterator(); while(true) { while(var11.hasNext()) { PropertyValue pv = (PropertyValue)var11.next(); if (pv.isConverted()) { deepCopy.add(pv); } else { String propertyName = pv.getName(); Object originalValue = pv.getValue(); Object resolvedValue = valueResolver.resolveValueIfNecessary(pv, originalValue); Object convertedValue = resolvedValue; boolean convertible = bw.isWritableProperty(propertyName) && !PropertyAccessorUtils.isNestedOrIndexedProperty(propertyName); if (convertible) { convertedValue = this.convertForProperty(resolvedValue, propertyName, bw, (TypeConverter)converter); } if (resolvedValue == originalValue) { if (convertible) { pv.setConvertedValue(convertedValue); } deepCopy.add(pv); } else if (convertible && originalValue instanceof TypedStringValue && !((TypedStringValue)originalValue).isDynamic() && !(convertedValue instanceof Collection) && !ObjectUtils.isArray(convertedValue)) { pv.setConvertedValue(convertedValue); deepCopy.add(pv); } else { resolveNecessary = true; deepCopy.add(new PropertyValue(pv, convertedValue)); } } } if (mpvs != null && !resolveNecessary) { mpvs.setConverted(); } try { bw.setPropertyValues(new MutablePropertyValues(deepCopy)); return; } catch (BeansException var19) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Error setting property values", var19); } } } }
=> AbstractPropertyAccessor.class
public void setPropertyValues(PropertyValues pvs) throws BeansException { // pvs: PropertyValues: length=1; bean property 'name' this.setPropertyValues(pvs, false, false); } public void setPropertyValues(PropertyValues pvs, boolean ignoreUnknown, boolean ignoreInvalid) throws BeansException { List<PropertyAccessException> propertyAccessExceptions = null; List<PropertyValue> propertyValues = pvs instanceof MutablePropertyValues ? ((MutablePropertyValues)pvs).getPropertyValueList() : Arrays.asList(pvs.getPropertyValues()); Iterator var6 = propertyValues.iterator(); while(var6.hasNext()) { PropertyValue pv = (PropertyValue)var6.next(); try { this.setPropertyValue(pv); // pv: bean property 'name' } catch (NotWritablePropertyException var9) { if (!ignoreUnknown) { throw var9; } } catch (NullValueInNestedPathException var10) { if (!ignoreInvalid) { throw var10; } } catch (PropertyAccessException var11) { if (propertyAccessExceptions == null) { propertyAccessExceptions = new LinkedList(); } propertyAccessExceptions.add(var11); } } if (propertyAccessExceptions != null) { PropertyAccessException[] paeArray = (PropertyAccessException[])propertyAccessExceptions.toArray(new PropertyAccessException[propertyAccessExceptions.size()]); throw new PropertyBatchUpdateException(paeArray); } }
=> AbstractNestablePropertyAccessor.class
public void setPropertyValue(PropertyValue pv) throws BeansException { AbstractNestablePropertyAccessor.PropertyTokenHolder tokens = (AbstractNestablePropertyAccessor.PropertyTokenHolder)pv.resolvedTokens; if (tokens == null) { String propertyName = pv.getName(); // propertyName: name AbstractNestablePropertyAccessor nestedPa; // nestedPa: org.springframework.beans.BeanWrapperImpl: wrapping object [HelloWorld@1190200a] try { nestedPa = this.getPropertyAccessorForPropertyPath(propertyName); } catch (NotReadablePropertyException var6) { throw new NotWritablePropertyException(this.getRootClass(), this.nestedPath + propertyName, "Nested property in path '" + propertyName + "' does not exist", var6); } tokens = this.getPropertyNameTokens(this.getFinalPath(nestedPa, propertyName)); if (nestedPa == this) { pv.getOriginalPropertyValue().resolvedTokens = tokens; } nestedPa.setPropertyValue(tokens, pv); } else { this.setPropertyValue(tokens, pv); } } protected void setPropertyValue(AbstractNestablePropertyAccessor.PropertyTokenHolder tokens, PropertyValue pv) throws BeansException { if (tokens.keys != null) { this.processKeyedProperty(tokens, pv); } else { this.processLocalProperty(tokens, pv); } } private void processLocalProperty(AbstractNestablePropertyAccessor.PropertyTokenHolder tokens, PropertyValue pv) { AbstractNestablePropertyAccessor.PropertyHandler ph = this.getLocalPropertyHandler(tokens.actualName); if (ph != null && ph.isWritable()) { Object oldValue = null; PropertyChangeEvent propertyChangeEvent; try { Object originalValue = pv.getValue(); Object valueToApply = originalValue; if (!Boolean.FALSE.equals(pv.conversionNecessary)) { if (pv.isConverted()) { valueToApply = pv.getConvertedValue(); } else { if (this.isExtractOldValueForEditor() && ph.isReadable()) { try { oldValue = ph.getValue(); } catch (Exception var8) { Exception ex = var8; if (var8 instanceof PrivilegedActionException) { ex = ((PrivilegedActionException)var8).getException(); } if (logger.isDebugEnabled()) { logger.debug("Could not read previous value of property '" + this.nestedPath + tokens.canonicalName + "'", ex); } } } valueToApply = this.convertForProperty(tokens.canonicalName, oldValue, originalValue, ph.toTypeDescriptor()); } pv.getOriginalPropertyValue().conversionNecessary = valueToApply != originalValue; } ph.setValue(this.wrappedObject, valueToApply); // wrappedObject: HelloWorld@1531 , valueToApply: Spring } catch (TypeMismatchException var9) { throw var9; } catch (InvocationTargetException var10) { propertyChangeEvent = new PropertyChangeEvent(this.rootObject, this.nestedPath + tokens.canonicalName, oldValue, pv.getValue()); if (var10.getTargetException() instanceof ClassCastException) { throw new TypeMismatchException(propertyChangeEvent, ph.getPropertyType(), var10.getTargetException()); } else { Throwable cause = var10.getTargetException(); if (cause instanceof UndeclaredThrowableException) { cause = cause.getCause(); } throw new MethodInvocationException(propertyChangeEvent, cause); } } catch (Exception var11) { propertyChangeEvent = new PropertyChangeEvent(this.rootObject, this.nestedPath + tokens.canonicalName, oldValue, pv.getValue()); throw new MethodInvocationException(propertyChangeEvent, var11); } } else if (pv.isOptional()) { if (logger.isDebugEnabled()) { logger.debug("Ignoring optional value for property '" + tokens.actualName + "' - property not found on bean class [" + this.getRootClass().getName() + "]"); } } else { throw this.createNotWritablePropertyException(tokens.canonicalName); } }
=> BeanWrapperImpl.class
public void setValue(final Object object, Object valueToApply) throws Exception { final Method writeMethod = this.pd instanceof GenericTypeAwarePropertyDescriptor ? ((GenericTypeAwarePropertyDescriptor)this.pd).getWriteMethodForActualAccess() : this.pd.getWriteMethod(); if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers()) && !writeMethod.isAccessible()) { if (System.getSecurityManager() != null) { AccessController.doPrivileged(new PrivilegedAction<Object>() { public Object run() { writeMethod.setAccessible(true); return null; } }); } else { writeMethod.setAccessible(true); } } final Object value = valueToApply; if (System.getSecurityManager() != null) { try { AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() { public Object run() throws Exception { writeMethod.invoke(object, value); return null; } }, BeanWrapperImpl.this.acc); } catch (PrivilegedActionException var6) { throw var6.getException(); } } else { // writeMethod: public void HelloWorld.setName(java.lang.String) // valueToApply : Spring writeMethod.invoke(BeanWrapperImpl.this.getWrappedInstance(), valueToApply); } }
=> Method.java
/** * Invokes the underlying method represented by this {@code Method} * object, on the specified object with the specified parameters. * Individual parameters are automatically unwrapped to match * primitive formal parameters, and both primitive and reference * parameters are subject to method invocation conversions as * necessary. * * <p>If the underlying method is static, then the specified {@code obj} * argument is ignored. It may be null. * * <p>If the number of formal parameters required by the underlying method is * 0, the supplied {@code args} array may be of length 0 or null. * * <p>If the underlying method is an instance method, it is invoked * using dynamic method lookup as documented in The Java Language * Specification, Second Edition, section 15.12.4.4; in particular, * overriding based on the runtime type of the target object will occur. * * <p>If the underlying method is static, the class that declared * the method is initialized if it has not already been initialized. * * <p>If the method completes normally, the value it returns is * returned to the caller of invoke; if the value has a primitive * type, it is first appropriately wrapped in an object. However, * if the value has the type of an array of a primitive type, the * elements of the array are <i>not</i> wrapped in objects; in * other words, an array of primitive type is returned. If the * underlying method return type is void, the invocation returns * null. * * @param obj the object the underlying method is invoked from * @param args the arguments used for the method call * @return the result of dispatching the method represented by * this object on {@code obj} with parameters * {@code args} * * @exception IllegalAccessException if this {@code Method} object * is enforcing Java language access control and the underlying * method is inaccessible. * @exception IllegalArgumentException if the method is an * instance method and the specified object argument * is not an instance of the class or interface * declaring the underlying method (or of a subclass * or implementor thereof); if the number of actual * and formal parameters differ; if an unwrapping * conversion for primitive arguments fails; or if, * after possible unwrapping, a parameter value * cannot be converted to the corresponding formal * parameter type by a method invocation conversion. * @exception InvocationTargetException if the underlying method * throws an exception. * @exception NullPointerException if the specified object is null * and the method is an instance method. * @exception ExceptionInInitializerError if the initialization * provoked by this method fails. */ @CallerSensitive public Object invoke(Object obj, Object... args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException { if (!override) { if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { Class<?> caller = Reflection.getCallerClass(); checkAccess(caller, clazz, obj, modifiers); } } MethodAccessor ma = methodAccessor; // read volatile if (ma == null) { ma = acquireMethodAccessor(); } return ma.invoke(obj, args); // obj: HelloWorld@1531 , args: Object[1]@1823 } DelegatingMethodAccessorImpl.class public Object invoke(Object var1, Object[] var2) throws IllegalArgumentException, InvocationTargetException { return this.delegate.invoke(var1, var2); }
=> NativeMethodAccessorImpl.class
public Object invoke(Object var1, Object[] var2) throws IllegalArgumentException, InvocationTargetException { if (++this.numInvocations > ReflectionFactory.inflationThreshold() && !ReflectUtil.isVMAnonymousClass(this.method.getDeclaringClass())) { MethodAccessorImpl var3 = (MethodAccessorImpl)(new MethodAccessorGenerator()).generateMethod(this.method.getDeclaringClass(), this.method.getName(), this.method.getParameterTypes(), this.method.getReturnType(), this.method.getExceptionTypes(), this.method.getModifiers()); this.parent.setDelegate(var3); } return invoke0(this.method, var1, var2); } private static native Object invoke0(Method var0, Object var1, Object[] var2);
跳转到了自定义类 HelloWorld.java 的 setName的部分
