加载xml文件
整体流程
1、封装xml文件尾Resource对象，构造BeanFactory对象
2、进入BeanFactory构造函数，调用XmlBeanDefinitionReader的loadBeanDefinitions去读取Resource
2.1、Resource会在loadBeanDefinitions中被封装为EncodedResource
2.2、loadBeanDefinitions中会对EncodedResource加入到ThreadLocal当前线程中，加入成功则会将EncodedResource封装为InputSource
2.3、对InputSource进行doLoadBeanDefinitions操作
2.4、将Xml配置文件通过doLoadDocument读取得到Document对象
2.5、通过registerBeanDefinitions将Document对象转换为BeanDefinitions注册到注册中心
2.5.1、实例化BeanDefinitionDocumentReader去读取Document
2.5.2、beanDefinitionDocumentReader.registerBeanDefinitions去将Document中的BeanDefinitions注册到注册中心
2.6、返回注册成功的BeanDefinition数量
源码解析
public XmlBeanFactory(Resource resource, BeanFactory parentBeanFactory) throws BeansException {
super(parentBeanFactory);
this.reader.loadBeanDefinitions(resource);
}@Override
public int loadBeanDefinitions(Resource resource) throws BeanDefinitionStoreException {
//1、将resource包装成带编码格式的EncodedResource
//2、重载调用loadBeanDefinitions
return loadBeanDefinitions(new EncodedResource(resource));
}public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException {
Assert.notNull(encodedResource, "EncodedResource must not be null");
if (logger.isTraceEnabled()) {
logger.trace("Loading XML bean definitions from " + encodedResource);
}
//拿到当前线程已经加载过的所有encodedResource
Set<EncodedResource> currentResources = this.resourcesCurrentlyBeingLoaded.get();
//将当前的encodedResource加入到threadLocal-set中，加入失败，说明当前encodedResource已经加载过了，不能重复加载
if (!currentResources.add(encodedResource)) {
throw new BeanDefinitionStoreException(
"Detected cyclic loading of " + encodedResource + " - check your import definitions!");
}
//拿到encodedResource包装的输入流对象
try (InputStream inputStream = encodedResource.getResource().getInputStream()) {
//因为接下来 要使用sax解析器 解析xml，所以需要输入流包装成inputSource，inputSource是sax中表示资源的对象。
InputSource inputSource = new InputSource(inputStream);
//条件成立说明encodedSource是需要设置编码格式的，也需要将sax中表示资源对象的格式设置为对应的编码
if (encodedResource.getEncoding() != null) {
inputSource.setEncoding(encodedResource.getEncoding());
}
//加载beanDefinition的入口
return doLoadBeanDefinitions(inputSource, encodedResource.getResource());
}
catch (IOException ex) {
throw new BeanDefinitionStoreException(
"IOException parsing XML document from " + encodedResource.getResource(), ex);
}
finally {
//当前线程加载完资源后，需要把资源移除出去。因为当前资源已经加载完成了。
//因为resourcesCurrentlyBeingLoaded表示当前线程正在加载的resource，执行到这里，就已经处理完成了。
//需要从set中移除
currentResources.remove(encodedResource);
//注意：这里是防止threadlocal内存泄露
if (currentResources.isEmpty()) {
this.resourcesCurrentlyBeingLoaded.remove();
}
}
}protected int doLoadBeanDefinitions(InputSource inputSource, Resource resource)
throws BeanDefinitionStoreException {
try {
//将resource转换成程序层面可以识别的有层次结构的document对象。
Document doc = doLoadDocument(inputSource, resource);
//将document解析成bd，并且注册到beanfactory中，最终返回新注册到bf的bd数量。
int count = registerBeanDefinitions(doc, resource);
if (logger.isDebugEnabled()) {
logger.debug("Loaded " + count + " bean definitions from " + resource);
}
//返回新注册的bd的数量
return count;
}
catch (BeanDefinitionStoreException ex) {
throw ex;
}
catch (SAXParseException ex) {
throw new XmlBeanDefinitionStoreException(resource.getDescription(),
"Line " + ex.getLineNumber() + " in XML document from " + resource + " is invalid", ex);
}
catch (SAXException ex) {
throw new XmlBeanDefinitionStoreException(resource.getDescription(),
"XML document from " + resource + " is invalid", ex);
}
catch (ParserConfigurationException ex) {
throw new BeanDefinitionStoreException(resource.getDescription(),
"Parser configuration exception parsing XML from " + resource, ex);
}
catch (IOException ex) {
throw new BeanDefinitionStoreException(resource.getDescription(),
"IOException parsing XML document from " + resource, ex);
}
catch (Throwable ex) {
throw new BeanDefinitionStoreException(resource.getDescription(),
"Unexpected exception parsing XML document from " + resource, ex);
}
}protected Document doLoadDocument(InputSource inputSource, Resource resource) throws Exception {
return this.documentLoader.loadDocument(inputSource, getEntityResolver(), this.errorHandler,
getValidationModeForResource(resource), isNamespaceAware());
}public int registerBeanDefinitions(Document doc, Resource resource) throws BeanDefinitionStoreException {
//创建一个BeanDefinitionDocumentReader 每个document对象都会创建一个BeanDefinitionDocumentReader对象
BeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader();
//getRegistry()会返回程序创建的beanFactory实例。countBefore：解析该doc之前，bf中已经有的bd数量
int countBefore = getRegistry().getBeanDefinitionCount();
//解析doc并且注册到beanFactory中
//xmlReaderContext：包含最主要的参数 ： 当前 this -> XmlBeanDefinitionReafer -> beanFactory
//因此可以把doc解析出来的bd放到beanFactory中
documentReader.registerBeanDefinitions(doc, createReaderContext(resource));
//返回的新注册的bd数量
return getRegistry().getBeanDefinitionCount() - countBefore;
}解析Document
时序图
源码解析
documentReader.registerBeanDefinitions(doc, createReaderContext(resource));protected void doRegisterBeanDefinitions(Element root) {
// Any nested <beans> elements will cause recursion in this method. In
// order to propagate and preserve <beans> default-* attributes correctly,
// keep track of the current (parent) delegate, which may be null. Create
// the new (child) delegate with a reference to the parent for fallback purposes,
// then ultimately reset this.delegate back to its original (parent) reference.
// this behavior emulates a stack of delegates without actually necessitating one.
BeanDefinitionParserDelegate parent = this.delegate;
//返回一个bd的解析器代表
this.delegate = createDelegate(getReaderContext(), root, parent);
//一般情况下条件成立
if (this.delegate.isDefaultNamespace(root)) {
//获取beans标签上的标签属性profile
String profileSpec = root.getAttribute(PROFILE_ATTRIBUTE);
//条件成立：说明beans标签上有profile 属性 有值
if (StringUtils.hasText(profileSpec)) {
//将profile按照 ,; 拆分成字符串数组
String[] specifiedProfiles = StringUtils.tokenizeToStringArray(
profileSpec, BeanDefinitionParserDelegate.MULTI_VALUE_ATTRIBUTE_DELIMITERS);
// We cannot use Profiles.of(...) since profile expressions are not supported
// in XML config. See SPR-12458 for details.
//!条件：true不解析，false继续解析
if (!getReaderContext().getEnvironment().acceptsProfiles(specifiedProfiles)) {
if (logger.isDebugEnabled()) {
logger.debug("Skipped XML bean definition file due to specified profiles [" + profileSpec +
"] not matching: " + getReaderContext().getResource());
}
return;
}
}
}
//子类扩张的地方
preProcessXml(root);
//解析<beans>标签
parseBeanDefinitions(root, this.delegate);
//子类扩张的地方
postProcessXml(root);
this.delegate = parent;
}parseBeanDefinitions流程
源码解析
来到XmlBeanDefinitionReader#registerBeanDefinitions方法，执行documentReader.registerBeanDefinitions(doc, createReaderContext(resource));逻辑，该逻辑是注册BeanDefinition的入口。
public int registerBeanDefinitions(Document doc, Resource resource) throws BeanDefinitionStoreException {
//创建一个BeanDefinitionDocumentReader 每个document对象都会创建一个BeanDefinitionDocumentReader对象
BeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader();
//getRegistry()会返回程序创建的beanFactory实例。countBefore：解析该doc之前，bf中已经有的bd数量
int countBefore = getRegistry().getBeanDefinitionCount();
//解析doc并且注册到beanFactory中
//xmlReaderContext：包含最主要的参数 ： 当前 this -> XmlBeanDefinitionReafer -> beanFactory
//因此可以把doc解析出来的bd放到beanFactory中
documentReader.registerBeanDefinitions(doc, createReaderContext(resource));
//返回的新注册的bd数量
return getRegistry().getBeanDefinitionCount() - countBefore;
}进入正式解析BeanDefinition逻辑doRegisterBeanDefinitions
@Override
public void registerBeanDefinitions(Document doc, XmlReaderContext readerContext) {
//先把上下文对象保存到reader的字段中
this.readerContext = readerContext;
//doc.getDocumentElement() =》 拿出document代表的xml的顶级标签 => <beans> ... <beans/>
doRegisterBeanDefinitions(doc.getDocumentElement());
}进入parseBeanDefinitions(root, this.delegate);逻辑，解析beans
protected void doRegisterBeanDefinitions(Element root) {
// Any nested <beans> elements will cause recursion in this method. In
// order to propagate and preserve <beans> default-* attributes correctly,
// keep track of the current (parent) delegate, which may be null. Create
// the new (child) delegate with a reference to the parent for fallback purposes,
// then ultimately reset this.delegate back to its original (parent) reference.
// this behavior emulates a stack of delegates without actually necessitating one.
BeanDefinitionParserDelegate parent = this.delegate;
//返回一个bd的解析器代表
this.delegate = createDelegate(getReaderContext(), root, parent);
//一般情况下条件成立
if (this.delegate.isDefaultNamespace(root)) {
//获取beans标签上的标签属性profile
String profileSpec = root.getAttribute(PROFILE_ATTRIBUTE);
//条件成立：说明beans标签上有profile 属性 有值
if (StringUtils.hasText(profileSpec)) {
//将profile按照 ,; 拆分成字符串数组
String[] specifiedProfiles = StringUtils.tokenizeToStringArray(
profileSpec, BeanDefinitionParserDelegate.MULTI_VALUE_ATTRIBUTE_DELIMITERS);
// We cannot use Profiles.of(...) since profile expressions are not supported
// in XML config. See SPR-12458 for details.
//!条件：true不解析，false继续解析
if (!getReaderContext().getEnvironment().acceptsProfiles(specifiedProfiles)) {
if (logger.isDebugEnabled()) {
logger.debug("Skipped XML bean definition file due to specified profiles [" + profileSpec +
"] not matching: " + getReaderContext().getResource());
}
return;
}
}
}
//子类扩张的地方
preProcessXml(root);
//解析<beans>标签
parseBeanDefinitions(root, this.delegate);
//子类扩张的地方
postProcessXml(root);
this.delegate = parent;
}parseBeanDefinitions：解析自定义标签和spring默认标签，我们主要看的是parseDefaultElement如何去解析spring的默认标签
protected void parseBeanDefinitions(Element root, BeanDefinitionParserDelegate delegate) {
//条件成立：说明root是spring的命名空间
if (delegate.isDefaultNamespace(root)) {
//<beans>
// <bean></bean>
// <bean></bean>
// <bean></bean>
//</beans>
NodeList nl = root.getChildNodes();
//迭代每一个子标签
for (int i = 0; i < nl.getLength(); i++) {
//node：子标签
Node node = nl.item(i);
if (node instanceof Element) {
//条件成立：说明子标签也是spring默认标签
Element ele = (Element) node;
if (delegate.isDefaultNamespace(ele)) {
parseDefaultElement(ele, delegate);
}
//条件不成立：说明子标签是自定义标签
else {
delegate.parseCustomElement(ele);
}
}
}
}
//解析自定义标签的逻辑
else {
delegate.parseCustomElement(root);
}
}使用委托者去解析各个spring中的默认标签，我们主要看的是bean标签，也就是processBeanDefinition的逻辑
private void parseDefaultElement(Element ele, BeanDefinitionParserDelegate delegate) {
//条件成立：说明ele标签是import标签
if (delegate.nodeNameEquals(ele, IMPORT_ELEMENT)) {
importBeanDefinitionResource(ele);
}
//条件成立：说明ele标签是别名标签
else if (delegate.nodeNameEquals(ele, ALIAS_ELEMENT)) {
processAliasRegistration(ele);
}
//条件成立：说明ele标签是bean标签
else if (delegate.nodeNameEquals(ele, BEAN_ELEMENT)) {
processBeanDefinition(ele, delegate);
}
//条件成立：说明ele标签是 嵌套 beans标签
else if (delegate.nodeNameEquals(ele, NESTED_BEANS_ELEMENT)) {
// recurse
doRegisterBeanDefinitions(ele);
}
}解析完成BeanDefinition，并且装饰后，注入到注册中心。我们看看如何进行对bean标签的解析，也就是parseBeanDefinitionElement的逻辑
protected void processBeanDefinition(Element ele, BeanDefinitionParserDelegate delegate) {
//解析完成后，返回bdHold，保存了bean标签上的别名信息和BeanDefinition
BeanDefinitionHolder bdHolder = delegate.parseBeanDefinitionElement(ele);
if (bdHolder != null) {
//装饰BeanDefinition，主要是处理自定义属性
bdHolder = delegate.decorateBeanDefinitionIfRequired(ele, bdHolder);
try {
// Register the final decorated instance.
//将BeanDefinition注册到容器中
BeanDefinitionReaderUtils.registerBeanDefinition(bdHolder, getReaderContext().getRegistry());
}
catch (BeanDefinitionStoreException ex) {
getReaderContext().error("Failed to register bean definition with name '" +
bdHolder.getBeanName() + "'", ele, ex);
}
// Send registration event.
//发送bd注册完成的事情
getReaderContext().fireComponentRegistered(new BeanComponentDefinition(bdHolder));
}
}解析的核心流程
@Nullable
public BeanDefinitionHolder parseBeanDefinitionElement(Element ele) {
return parseBeanDefinitionElement(ele, null);
}@Nullable
public BeanDefinitionHolder parseBeanDefinitionElement(Element ele, @Nullable BeanDefinition containingBean) {
//获取bean标签id属性值
String id = ele.getAttribute(ID_ATTRIBUTE);
//获取bean标签name属性值
String nameAttr = ele.getAttribute(NAME_ATTRIBUTE);
//别名列表
List<String> aliases = new ArrayList<>();
if (StringUtils.hasLength(nameAttr)) {
//将name属性值按照,;拆分成数组
String[] nameArr = StringUtils.tokenizeToStringArray(nameAttr, MULTI_VALUE_ATTRIBUTE_DELIMITERS);
//保存到别名数组
aliases.addAll(Arrays.asList(nameArr));
}
//默认情况beanName为id
String beanName = id;
//条件1成立：说明id为空
//条件2处理：说明别名信息List有值
if (!StringUtils.hasText(beanName) && !aliases.isEmpty()) {
//那别名的第一个值当做是beanName
beanName = aliases.remove(0);
if (logger.isTraceEnabled()) {
logger.trace("No XML 'id' specified - using '" + beanName +
"' as bean name and " + aliases + " as aliases");
}
}
if (containingBean == null) {
checkNameUniqueness(beanName, aliases, ele);
}
//核心逻辑：将ele标签解析成BeanDefinition
AbstractBeanDefinition beanDefinition = parseBeanDefinitionElement(ele, beanName, containingBean);
//条件成立：说明ele被解析成立BeanDefinition对象
if (beanDefinition != null) {
//条件成立：说明没有传入id和name，需要生成beanName
if (!StringUtils.hasText(beanName)) {
try {
if (containingBean != null) {
beanName = BeanDefinitionReaderUtils.generateBeanName(
beanDefinition, this.readerContext.getRegistry(), true);
}
else {
//生成className+序列号作为名称
//如：demo0#0
beanName = this.readerContext.generateBeanName(beanDefinition);
// Register an alias for the plain bean class name, if still possible,
// if the generator returned the class name plus a suffix.
// This is expected for Spring 1.2/2.0 backwards compatibility.
//拿到bd对呀的className
String beanClassName = beanDefinition.getBeanClassName();
//条件1：一般成立
//条件2：一般成立
//条件3：一般成立
//条件4：判断BeanClassName是否被使用，成立说明没有被使用，这个时候给当前beanDefinition一个叫做beanClassName的别名
if (beanClassName != null &&
beanName.startsWith(beanClassName) &&
beanName.length() > beanClassName.length() &&
!this.readerContext.getRegistry().isBeanNameInUse(beanClassName)) {
aliases.add(beanClassName);
}
}
if (logger.isTraceEnabled()) {
logger.trace("Neither XML 'id' nor 'name' specified - " +
"using generated bean name [" + beanName + "]");
}
}
catch (Exception ex) {
error(ex.getMessage(), ele);
return null;
}
}
String[] aliasesArray = StringUtils.toStringArray(aliases);
//将BeanDefinition和benaName和别名保证到BeanDefinitionHolder中
return new BeanDefinitionHolder(beanDefinition, beanName, aliasesArray);
}
return null;
}解析子标签和属性
@Nullable
public AbstractBeanDefinition parseBeanDefinitionElement(
Element ele, String beanName, @Nullable BeanDefinition containingBean) {
//表示当前解析器的状态，因为接下来要解析bean标签，所以设置为了BeanEntry状态
this.parseState.push(new BeanEntry(beanName));
String className = null;
//一般情况 bean 标签 都保护class属性，除非bean标签作为parent标签被子标签继承时，class属性才为null
if (ele.hasAttribute(CLASS_ATTRIBUTE)) {
//获取bean标签className
className = ele.getAttribute(CLASS_ATTRIBUTE).trim();
}
String parent = null;
//bean标签可以继承parent标签，类似 子类 继承 父类，一般很少用到
if (ele.hasAttribute(PARENT_ATTRIBUTE)) {
parent = ele.getAttribute(PARENT_ATTRIBUTE);
}
try {
//创建了benaDefinition对象，仅仅设置了class信息
AbstractBeanDefinition bd = createBeanDefinition(className, parent);
//解析bean标签下的属性
parseBeanDefinitionAttributes(ele, beanName, containingBean, bd);
//<bean>
// <description>xxxx</description>
// </bean>
//将description标签中的信息保存到benaDefinition中
bd.setDescription(DomUtils.getChildElementValueByTagName(ele, DESCRIPTION_ELEMENT));
//<bean>
// <mate key="mate_1" value="mate_1_value"></mate>
// <mate key="mate_2" value="mate_2_value"></mate>
// </bean>
//解析mate标签
parseMetaElements(ele, bd);
//解析lookup-method：lookup-method主要是动态代理返回对应的指定bean
//bd中保存了需要methodOverrides
parseLookupOverrideSubElements(ele, bd.getMethodOverrides());
//解析replace-method：replace-method主要是动态代理为指定方法
parseReplacedMethodSubElements(ele, bd.getMethodOverrides());
//解析构造方法参数子标签
parseConstructorArgElements(ele, bd);
//解析属性子标签
parsePropertyElements(ele, bd);
//解析qualifer子标签：匹配到多个bean的时候，可以使用qualifer来指定bean
parseQualifierElements(ele, bd);
bd.setResource(this.readerContext.getResource());
bd.setSource(extractSource(ele));
return bd;
}
catch (ClassNotFoundException ex) {
error("Bean class [" + className + "] not found", ele, ex);
}
catch (NoClassDefFoundError err) {
error("Class that bean class [" + className + "] depends on not found", ele, err);
}
catch (Throwable ex) {
error("Unexpected failure during bean definition parsing", ele, ex);
}
finally {
this.parseState.pop();
}
return null;
}解析属性逻辑
public AbstractBeanDefinition parseBeanDefinitionAttributes(Element ele, String beanName,
@Nullable BeanDefinition containingBean, AbstractBeanDefinition bd) {
//条件成立：说明bean标签有singleton属性，这个属性过期了，给一个错误
if (ele.hasAttribute(SINGLETON_ATTRIBUTE)) {
error("Old 1.x 'singleton' attribute in use - upgrade to 'scope' declaration", ele);
}
//条件成立：说明bean标签存在一个scope属性。scope默认值是singleton
else if (ele.hasAttribute(SCOPE_ATTRIBUTE)) {
//读取scope设置到bd中
bd.setScope(ele.getAttribute(SCOPE_ATTRIBUTE));
}
else if (containingBean != null) {
// Take default from containing bean in case of an inner bean definition.
bd.setScope(containingBean.getScope());
}
//<bean abstract="true"></bean>
//条件成立：说明bean是一个抽象标签，只能作为父标签存在，让子标签去继承
if (ele.hasAttribute(ABSTRACT_ATTRIBUTE)) {
bd.setAbstract(TRUE_VALUE.equals(ele.getAttribute(ABSTRACT_ATTRIBUTE)));
}
//读取bean标签上的lazy-init属性
String lazyInit = ele.getAttribute(LAZY_INIT_ATTRIBUTE);
//条件成立：说明lazyInit为空或者是default
if (isDefaultValue(lazyInit)) {
//获取默认值。默认是false
lazyInit = this.defaults.getLazyInit();
}
bd.setLazyInit(TRUE_VALUE.equals(lazyInit));
//获取bean标签上的autowire属性值
String autowire = ele.getAttribute(AUTOWIRE_ATTRIBUTE);
//转为成int值后，设置到bd中
bd.setAutowireMode(getAutowireMode(autowire));
//<bean depends-on="a,b"></bean>，说明bean实例化时需要先处理a，b
//条件成立：存在depends-on属性
if (ele.hasAttribute(DEPENDS_ON_ATTRIBUTE)) {
String dependsOn = ele.getAttribute(DEPENDS_ON_ATTRIBUTE);
bd.setDependsOn(StringUtils.tokenizeToStringArray(dependsOn, MULTI_VALUE_ATTRIBUTE_DELIMITERS));
}
//读取bean标签autowire-candidate属性，设置了bean的autowire-candidate为false后，则当前bean不参与其他bean的自动依赖注入。
// （场景在于多个实现了同一个接口的bean要注入到某个bean的时候，指定不参与）
//autowireCandidate默认值是true，表示参与外部的注入
String autowireCandidate = ele.getAttribute(AUTOWIRE_CANDIDATE_ATTRIBUTE);
if (isDefaultValue(autowireCandidate)) {
//缺省值是正则表达式
String candidatePattern = this.defaults.getAutowireCandidates();
if (candidatePattern != null) {
//拆分多个正则表达式为数组
String[] patterns = StringUtils.commaDelimitedListToStringArray(candidatePattern);
//判断是否符合其中的正则表达式，
bd.setAutowireCandidate(PatternMatchUtils.simpleMatch(patterns, beanName));
}
}
else {
//配置了autowire-candidate
bd.setAutowireCandidate(TRUE_VALUE.equals(autowireCandidate));
}
//当某个接口有多个实现对象时，外部spring对象依赖该接口时，可以给该接口指定的实现对象
if (ele.hasAttribute(PRIMARY_ATTRIBUTE)) {
bd.setPrimary(TRUE_VALUE.equals(ele.getAttribute(PRIMARY_ATTRIBUTE)));
}
//当spring创建该bean对应的实例的时候，最终会执行init-method方法
if (ele.hasAttribute(INIT_METHOD_ATTRIBUTE)) {
String initMethodName = ele.getAttribute(INIT_METHOD_ATTRIBUTE);
bd.setInitMethodName(initMethodName);
}
else if (this.defaults.getInitMethod() != null) {
bd.setInitMethodName(this.defaults.getInitMethod());
bd.setEnforceInitMethod(false);
}
//当spring容器销毁的时候，执行spring容器内管理的销毁方法
if (ele.hasAttribute(DESTROY_METHOD_ATTRIBUTE)) {
String destroyMethodName = ele.getAttribute(DESTROY_METHOD_ATTRIBUTE);
bd.setDestroyMethodName(destroyMethodName);
}
else if (this.defaults.getDestroyMethod() != null) {
bd.setDestroyMethodName(this.defaults.getDestroyMethod());
bd.setEnforceDestroyMethod(false);
}
//读取factory-method属性
if (ele.hasAttribute(FACTORY_METHOD_ATTRIBUTE)) {
bd.setFactoryMethodName(ele.getAttribute(FACTORY_METHOD_ATTRIBUTE));
}
//读取factory-bean属性
if (ele.hasAttribute(FACTORY_BEAN_ATTRIBUTE)) {
bd.setFactoryBeanName(ele.getAttribute(FACTORY_BEAN_ATTRIBUTE));
}
return bd;
}小结
spring对于xml文件的的解析比较复杂，不要太过于深入，知道整体的流程就差不多了
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
