org.springframework.beans.factory.support.DefaultListableBeanFactory#setBeanClassLoader ( )源码实例Demo

/**
 * 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;
}
 

/**
 * 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;
}
 

/**
 * 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;
}
 

/**
 * 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;
}
 

/**
 * 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;
}