ApplicationContextAware获取Spring上下文，通过基类获取properties中的配置属性

说明： 该方法实现了，通过继承JAR包中基类来获取properties中配置的相关属性，并添加至spring容器中，供代码中使用。

1。 基类

package com.ffcs.icity.config;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;import org.apache.commons.lang3.builder.ToStringBuilder;import org.apache.commons.lang3.builder.ToStringStyle;import org.springframework.beans.factory.InitializingBean;import org.springframework.beans.factory.annotation.Value;/** * 此类用于存放框架相关的配置. * *  */public abstract class BaseApplicationConfig implements InitializingBean {@Value("${log.isDumpRequest:false}")@FieldDescription("是否dump请求")private boolean isDumpRequest = false;@Value("${log.logger.root.level:DEBUG}")@FieldDescription("日志级别等级")private String logLevel = "DEBUG";public boolean isDumpRequest() {return isDumpRequest;}public String getLogLevel() {return logLevel;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.DEFAULT_STYLE);}@Target({ ElementType.FIELD })@Retention(RetentionPolicy.RUNTIME)public @interface FieldDescription {String value();}@Overridepublic void afterPropertiesSet() throws Exception {//this.originalApplicationConfig = BeanUtils.copyObject(this, "originalApplicationConfig");}}

2。 配置文件内容

#log levellog.logger.root.level=DEBUG#log open flaglog.isDumpRequest=true

3。 实现ApplicationContextAware接口，获取spring上下文相关类

package com.ffcs.icity.config;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;/** * BaseApplicationConfig实例的获取 * @author linwei * */public class ApplicationConfigHolder implements ApplicationContextAware {private final static Logger logger = LoggerFactory.getLogger(ApplicationConfigHolder.class);private static BaseApplicationConfig applicationConfig;public static <T> T getApplicationConfig() {return (T)applicationConfig;}/** * 通过实现ApplicationContextAware接口，获取Spring的实例上下文，并获取BaseApplicationConfig实例 */@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {//获取类型为BaseApplicationConfig的BEANapplicationConfig = applicationContext.getBean(BaseApplicationConfig.class);logger.info("loaded initial application config:{}", applicationConfig);}}

package com.ffcs.icity.config;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;/** * Spring上下文的获取 * @author linwei * */public class ApplicationContextHolder implements ApplicationContextAware{private static ApplicationContext applicationContext;public static ApplicationContext getApplicationContext() {return ApplicationContextHolder.applicationContext;}@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {ApplicationContextHolder.applicationContext=applicationContext;}}

package com.ffcs.icity.config;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * 此类保存当前请求的上下文信息. *  *  */public class RequestContextHolder {/** * 当前请求的请求对象 */private static ThreadLocal<HttpServletRequest> request = new ThreadLocal<HttpServletRequest>();/** * 当前请求的请求对象 */private static ThreadLocal<HttpServletResponse> response = new ThreadLocal<HttpServletResponse>();/** * 当前请求的请求参数 */private static ThreadLocal<Object> requestArgument = new ThreadLocal<Object>();/** * 当前请求的请求ID */private static ThreadLocal<String> requestId = new ThreadLocal<String>();public static HttpServletRequest getRequest() {return request.get();}public static void setRequest(HttpServletRequest request) {RequestContextHolder.request.set(request);}public static HttpServletResponse getResponse() {return response.get();}public static void setResponse(HttpServletResponse response) {RequestContextHolder.response.set(response);}public static Object getRequestArgument() {return requestArgument.get();}public static void setRequestArgument(Object requestArgument) {RequestContextHolder.requestArgument.set(requestArgument);}public static String getRequestId() {return requestId.get();}public static void setRequestId(String requestId) {RequestContextHolder.requestId.set(requestId);}public static void clear() {request.remove();response.remove();requestArgument.remove();requestId.remove();}}

说明：以上工具类可以存放至JAR包中，供其他的项目导入使用。

4。 在spring的web项目中，新建一个类，继承基类，并在spring中注入相关BEAN，即可获取其相关的属性信息，如下：

package com.ffcs.icity.support;import com.ffcs.icity.config.BaseApplicationConfig;public class ApplicationConfig extends BaseApplicationConfig {}

      spring的配置文件内容如下：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:jdbc="http://www.springframework.org/schema/jdbc"xmlns:jee="http://www.springframework.org/schema/jee"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:jpa="http://www.springframework.org/schema/data/jpa"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsdhttp://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"default-lazy-init="false"><!-- 自动扫描且只扫描@Controller --><context:component-scan base-package="com.ffcs.icity"><context:include-filter type="annotation"expression="org.springframework.stereotype.Controller" /></context:component-scan><bean id="springContext" class="com.ffcs.icity.support.TestApplicationContext" lazy-init="false"/><bean class="com.ffcs.icity.config.ApplicationContextHolder" /><bean class="com.ffcs.icity.support.ApplicationConfig" /><bean class="com.ffcs.icity.config.ApplicationConfigHolder" /><beanclass="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"><property name="messageConverters"><list><ref bean="mappingJacksonHttpMessageConverter" /></list></property></bean><bean id="mappingJacksonHttpMessageConverter"class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"><property name="objectMapper"><bean class="org.codehaus.jackson.map.ObjectMapper"><property name="dateFormat"><bean class="java.text.SimpleDateFormat"><constructor-arg type="java.lang.String"value="yyyy-MM-dd HH:mm:ss"></constructor-arg></bean></property></bean></property></bean><bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"><!--<property name="interceptors"><list>    <ref bean="stopWatchHandlerInterceptor"></ref><ref bean="handlerInterceptorTest1"></ref><ref bean="handlerInterceptorTest2"></ref></list></property>--></bean><context:property-placeholder ignore-unresolvable="true" location="classpath*:/config.properties" /></beans>

说明： 以上bean的设置请关闭延迟加载功能。即整个配置文件使用  default-lazy-init="false" 属性，或者在 

<bean id="springContext" class="com.ffcs.icity.support.TestApplicationContext" lazy-init="false"/>  bean中直接设置延迟加载关闭。

             或者另外一种方式，打开延迟加载功能，但在代码中需要自己手动进行注入，即使用@Autowired 实现自己的手动注入，实现该bean的初始化工作。

             因为延迟加载打开后，需要代码中手动注入才可以实现bean工厂的初始化。(延迟加载关闭，则在项目启动时，由web容器自动进行初始化加载。)

5.   代码直接调用例子：

      可直接新建方法：isDumpRequest() ，这样就获取到最新的配置文件中配置的值。如配置文件未配置，则使用基类中定义的默认值.

       private boolean isDumpRequest() {
return getApplicationConfig().isDumpRequest();
}


private BaseApplicationConfig getApplicationConfig() {
return ApplicationConfigHolder.getApplicationConfig();
}