org.springframework.beans.factory.xml.XmlBeanDefinitionReader#loadBeanDefinitions ( )源码实例Demo

@Test
public void testGenericApplicationContextWithXmlBeanDefinitionsAndClassLoaderNull() {
	GenericApplicationContext ctx = new GenericApplicationContext();
	ctx.setClassLoader(null);
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(ctx);
	reader.loadBeanDefinitions(new ClassPathResource(CONTEXT_B, getClass()));
	reader.loadBeanDefinitions(new ClassPathResource(CONTEXT_C, getClass()));
	reader.loadBeanDefinitions(new ClassPathResource(CONTEXT_A, getClass()));
	ctx.refresh();
	assertEquals(ObjectUtils.identityToString(ctx), ctx.getId());
	assertEquals(ObjectUtils.identityToString(ctx), ctx.getDisplayName());
	assertTrue(ctx.containsBean("service"));
	assertTrue(ctx.containsBean("logicOne"));
	assertTrue(ctx.containsBean("logicTwo"));
	ctx.close();
}
 

@Test
public void testDefaultAutowire() {
	GenericApplicationContext context = new GenericApplicationContext();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(context);
	reader.loadBeanDefinitions(LOCATION_PREFIX + "defaultWithNoOverridesTests.xml");
	context.refresh();
	DefaultsTestBean bean = (DefaultsTestBean) context.getBean(TEST_BEAN_NAME);
	assertNull("no dependencies should have been autowired", bean.getConstructorDependency());
	assertNull("no dependencies should have been autowired", bean.getPropertyDependency1());
	assertNull("no dependencies should have been autowired", bean.getPropertyDependency2());
}
 

@Test
public void testDefaultLazyInit() {
	GenericApplicationContext context = new GenericApplicationContext();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(context);
	reader.loadBeanDefinitions(LOCATION_PREFIX + "defaultWithNoOverridesTests.xml");
	assertFalse("lazy-init should be false", context.getBeanDefinition(TEST_BEAN_NAME).isLazyInit());
	assertEquals("initCount should be 0", 0, DefaultsTestBean.INIT_COUNT);
	context.refresh();
	assertEquals("bean should have been instantiated", 1, DefaultsTestBean.INIT_COUNT);
}
 

@Test
public void testLazyInitTrue() {
	GenericApplicationContext context = new GenericApplicationContext();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(context);
	reader.loadBeanDefinitions(LOCATION_PREFIX + "defaultLazyInitTrueTests.xml");
	assertTrue("lazy-init should be true", context.getBeanDefinition(TEST_BEAN_NAME).isLazyInit());
	assertEquals("initCount should be 0", 0, DefaultsTestBean.INIT_COUNT);
	context.refresh();
	assertEquals("bean should not have been instantiated yet", 0, DefaultsTestBean.INIT_COUNT);
	context.getBean(TEST_BEAN_NAME);
	assertEquals("bean should have been instantiated", 1, DefaultsTestBean.INIT_COUNT);
}
 

@Test
public void testParse() throws Exception {
	DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanFactory);
	reader.loadBeanDefinitions(CONTEXT);

	assertTrue(beanFactory.containsBeanDefinition("testPointcut"));
}
 

/**
 * Create a new instance of the {@link SQLErrorCodesFactory} class.
 * <p>Not public to enforce Singleton design pattern. Would be private
 * except to allow testing via overriding the
 * {@link #loadResource(String)} method.
 * <p><b>Do not subclass in application code.</b>
 * @see #loadResource(String)
 */
protected SQLErrorCodesFactory() {
	Map<String, SQLErrorCodes> errorCodes;

	try {
		DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
		lbf.setBeanClassLoader(getClass().getClassLoader());
		XmlBeanDefinitionReader bdr = new XmlBeanDefinitionReader(lbf);

		// Load default SQL error codes.
		Resource resource = loadResource(SQL_ERROR_CODE_DEFAULT_PATH);
		if (resource != null && resource.exists()) {
			bdr.loadBeanDefinitions(resource);
		}
		else {
			logger.warn("Default sql-error-codes.xml not found (should be included in spring.jar)");
		}

		// Load custom SQL error codes, overriding defaults.
		resource = loadResource(SQL_ERROR_CODE_OVERRIDE_PATH);
		if (resource != null && resource.exists()) {
			bdr.loadBeanDefinitions(resource);
			logger.info("Found custom sql-error-codes.xml file at the root of the classpath");
		}

		// Check all beans of type SQLErrorCodes.
		errorCodes = lbf.getBeansOfType(SQLErrorCodes.class, true, false);
		if (logger.isInfoEnabled()) {
			logger.info("SQLErrorCodes loaded: " + errorCodes.keySet());
		}
	}
	catch (BeansException ex) {
		logger.warn("Error loading SQL error codes from config file", ex);
		errorCodes = Collections.emptyMap();
	}

	this.errorCodesMap = errorCodes;
}
 

@Test
public void testDefaultNonExistingInitAndDestroyMethodsDefined() {
	GenericApplicationContext context = new GenericApplicationContext();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(context);
	reader.loadBeanDefinitions(LOCATION_PREFIX + "defaultNonExistingInitAndDestroyMethodsTests.xml");
	context.refresh();
	DefaultsTestBean bean = (DefaultsTestBean) context.getBean(TEST_BEAN_NAME);
	assertFalse("bean should not have been initialized", bean.isInitialized());
	context.close();
	assertFalse("bean should not have been destroyed", bean.isDestroyed());
}
 

public static void main(String[] args) throws Exception {
	ClassPathResource resource = new ClassPathResource("beans.xml");
	DefaultListableBeanFactory factory = new DefaultListableBeanFactory();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(factory);
	reader.loadBeanDefinitions(resource);

	HelloBean helloBean = (HelloBean) factory.getBean("hello");
	System.out.println(helloBean.hello("hello world1"));

}
 

@Test
public void testDefaultDependencyCheck() {
	GenericApplicationContext context = new GenericApplicationContext();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(context);
	reader.loadBeanDefinitions(LOCATION_PREFIX + "defaultWithNoOverridesTests.xml");
	context.refresh();
	DefaultsTestBean bean = (DefaultsTestBean) context.getBean(TEST_BEAN_NAME);
	assertNull("constructor dependency should not have been autowired", bean.getConstructorDependency());
	assertNull("property dependencies should not have been autowired", bean.getPropertyDependency1());
	assertNull("property dependencies should not have been autowired", bean.getPropertyDependency2());
}
 

@Before
public void setUp() {
	beanFactory = new DefaultListableBeanFactory();
	Scope scope = new NoOpScope() {
		private int index;
		private List<TestBean> objects = new LinkedList<TestBean>(); {
			objects.add(new TestBean());
			objects.add(new TestBean());
		}
		@Override
		public Object get(String name, ObjectFactory<?> objectFactory) {
			if (index >= objects.size()) {
				index = 0;
			}
			return objects.get(index++);
		}
	};

	beanFactory.registerScope("myScope", scope);

	String[] scopeNames = beanFactory.getRegisteredScopeNames();
	assertEquals(1, scopeNames.length);
	assertEquals("myScope", scopeNames[0]);
	assertSame(scope, beanFactory.getRegisteredScope("myScope"));

	XmlBeanDefinitionReader xbdr = new XmlBeanDefinitionReader(beanFactory);
	xbdr.loadBeanDefinitions(CONTEXT);
}
 

private void loadBeanDefinitions(String fileName) {
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(this.appContext);
	ClassPathResource resource = new ClassPathResource(fileName, MessageBrokerBeanDefinitionParserTests.class);
	reader.loadBeanDefinitions(resource);
	this.appContext.setServletContext(new MockServletContext());
	this.appContext.refresh();
}
 

/**
 * Initialize the view bean factory from the XML file.
 * Synchronized because of access by parallel threads.
 * @throws BeansException in case of initialization errors
 */
protected synchronized BeanFactory initFactory() throws BeansException {
	if (this.cachedFactory != null) {
		return this.cachedFactory;
	}

	Resource actualLocation = this.location;
	if (actualLocation == null) {
		actualLocation = getApplicationContext().getResource(DEFAULT_LOCATION);
	}

	// Create child ApplicationContext for views.
	GenericWebApplicationContext factory = new GenericWebApplicationContext();
	factory.setParent(getApplicationContext());
	factory.setServletContext(getServletContext());

	// Load XML resource with context-aware entity resolver.
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(factory);
	reader.setEnvironment(getApplicationContext().getEnvironment());
	reader.setEntityResolver(new ResourceEntityResolver(getApplicationContext()));
	reader.loadBeanDefinitions(actualLocation);

	factory.refresh();

	if (isCache()) {
		this.cachedFactory = factory;
	}
	return factory;
}
 

/**
    * {@inheritDoc}
    */
@Override
public synchronized void initializeMetadata(Collection<Class<?>> types) {
	// First, extract the data from the spring configuration into a form usable by the Spring XML parser
	if (LOG.isDebugEnabled()) {
		LOG.debug("Loading Metadata Bean Definitions from Locations:");
		for (String loc : resourceLocations) {
			LOG.debug(loc);
		}
	}
	// Now, parse the beans and load them into the bean factory
	XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(beanFactory);
	String configFileLocationsArray[] = new String[resourceLocations.size()];
	configFileLocationsArray = resourceLocations.toArray(configFileLocationsArray);
	xmlReader.loadBeanDefinitions(configFileLocationsArray);

	// extract the objects from the bean factory, by pulling all the DataObjectMetadata objects
	Map<String, DataObjectMetadata> metadataObjects = beanFactory.getBeansOfType(DataObjectMetadata.class);
	if (LOG.isInfoEnabled()) {
		LOG.info(metadataObjects.size() + " DataObjectMetadata objects in Spring configuration files");
	}
	// populate the map
	masterMetadataMap.clear();
	for (DataObjectMetadata metadata : metadataObjects.values()) {
		if (metadata.getType() != null) {
			if (metadata instanceof DataObjectMetadataImpl) {
				((DataObjectMetadataImpl) metadata).setProviderName(this.getClass().getSimpleName());
			}
			masterMetadataMap.put(metadata.getType(), metadata);
		} else {
			LOG.error("Configuration Error.  MetadataObject in the Spring context contained a null DataObjectType reference: "
					+ metadata);
		}
	}
}
 

private void loadBeanDefinitions(Resource resource, ClassLoader classLoader) {
    applicationContext = new GenericApplicationContext();
    applicationContext.setClassLoader(classLoader);
    XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(applicationContext) {
        @Override
        protected NamespaceHandlerResolver createDefaultNamespaceHandlerResolver() {
            NamespaceHandlerResolver defaultResolver = super.createDefaultNamespaceHandlerResolver();
            return new SpringCamelContextBootstrap.CamelNamespaceHandlerResolver(defaultResolver);
        }
    };
    xmlReader.loadBeanDefinitions(resource);
}
 

public static void main(String[] args) {

        // 创建 IoC 底层容器
        DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
        // 创建 XML 资源的 BeanDefinitionReader
        XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanFactory);
        // 记载 XML 资源
        reader.loadBeanDefinitions("META-INF/users-context.xml");
        // 获取 User Bean 对象
        User user = beanFactory.getBean(User.class);
        System.out.println(user);
    }
 

/**
 * Create a new instance of the {@link SQLErrorCodesFactory} class.
 * <p>Not public to enforce Singleton design pattern. Would be private
 * except to allow testing via overriding the
 * {@link #loadResource(String)} method.
 * <p><b>Do not subclass in application code.</b>
 * @see #loadResource(String)
 */
protected SQLErrorCodesFactory() {
	Map<String, SQLErrorCodes> errorCodes;

	try {
		DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
		lbf.setBeanClassLoader(getClass().getClassLoader());
		XmlBeanDefinitionReader bdr = new XmlBeanDefinitionReader(lbf);

		// Load default SQL error codes.
		Resource resource = loadResource(SQL_ERROR_CODE_DEFAULT_PATH);
		if (resource != null && resource.exists()) {
			bdr.loadBeanDefinitions(resource);
		}
		else {
			logger.info("Default sql-error-codes.xml not found (should be included in spring-jdbc jar)");
		}

		// Load custom SQL error codes, overriding defaults.
		resource = loadResource(SQL_ERROR_CODE_OVERRIDE_PATH);
		if (resource != null && resource.exists()) {
			bdr.loadBeanDefinitions(resource);
			logger.debug("Found custom sql-error-codes.xml file at the root of the classpath");
		}

		// Check all beans of type SQLErrorCodes.
		errorCodes = lbf.getBeansOfType(SQLErrorCodes.class, true, false);
		if (logger.isTraceEnabled()) {
			logger.trace("SQLErrorCodes loaded: " + errorCodes.keySet());
		}
	}
	catch (BeansException ex) {
		logger.warn("Error loading SQL error codes from config file", ex);
		errorCodes = Collections.emptyMap();
	}

	this.errorCodesMap = errorCodes;
}
 

@Test
public void testDefaultInitAndDestroyMethodsNotDefined() {
	GenericApplicationContext context = new GenericApplicationContext();
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(context);
	reader.loadBeanDefinitions(LOCATION_PREFIX + "defaultWithNoOverridesTests.xml");
	context.refresh();
	DefaultsTestBean bean = (DefaultsTestBean) context.getBean(TEST_BEAN_NAME);
	assertFalse("bean should not have been initialized", bean.isInitialized());
	context.close();
	assertFalse("bean should not have been destroyed", bean.isDestroyed());
}
 

private void readBeans(Resource beanResource) {
    XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(
                    applicationContext);
    reader.loadBeanDefinitions(beanResource);
}
 

private void loadBeanDefinitions(String fileName) {
	XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(this.appContext);
	Resource resource = new ClassPathResource(fileName, AnnotationDrivenBeanDefinitionParserTests.class);
	reader.loadBeanDefinitions(resource);
	this.appContext.refresh();
}
 

/**
 * Load the bean definitions with the given XmlBeanDefinitionReader.
 * <p>The lifecycle of the bean factory is handled by the {@link #refreshBeanFactory}
 * method; hence this method is just supposed to load and/or register bean definitions.
 * @param reader the XmlBeanDefinitionReader to use
 * @throws BeansException in case of bean registration errors
 * @throws IOException if the required XML document isn't found
 * @see #refreshBeanFactory
 * @see #getConfigLocations
 * @see #getResources
 * @see #getResourcePatternResolver
 */
protected void loadBeanDefinitions(XmlBeanDefinitionReader reader) throws BeansException, IOException {
	Resource[] configResources = getConfigResources();
	if (configResources != null) {
		reader.loadBeanDefinitions(configResources);
	}
	String[] configLocations = getConfigLocations();
	if (configLocations != null) {
		reader.loadBeanDefinitions(configLocations);
	}
}