项目初始导入

src/main/java/com/nis/web/service/SpringContextHolder.java

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+/**
+ * Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
+ */
+package com.nis.web.service;
+
+
+import org.apache.commons.lang3.Validate;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.stereotype.Service;
+
+
+/**
+ * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext.
+ * 
+ * @author Zaric
+ * @date 2013-5-29 下午1:25:40
+ */
+@Service
+@Lazy(false)
+public class SpringContextHolder implements ApplicationContextAware, DisposableBean {
+
+	private static ApplicationContext applicationContext = null;
+
+	private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);
+
+	/**
+	 * 取得存储在静态变量中的ApplicationContext.
+	 */
+	public static ApplicationContext getApplicationContext() {
+		assertContextInjected();
+		return applicationContext;
+	}
+
+	/**
+	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
+	 */
+	@SuppressWarnings("unchecked")
+	public static <T> T getBean(String name) {
+		assertContextInjected();
+		return (T) applicationContext.getBean(name);
+	}
+
+	/**
+	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
+	 */
+	public static <T> T getBean(Class<T> requiredType) {
+		assertContextInjected();
+		return applicationContext.getBean(requiredType);
+	}
+
+	/**
+	 * 清除SpringContextHolder中的ApplicationContext为Null.
+	 */
+	public static void clearHolder() {
+		if (logger.isDebugEnabled()){
+			logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
+		}
+		applicationContext = null;
+	}
+
+	/**
+	 * 实现ApplicationContextAware接口, 注入Context到静态变量中.
+	 */
+	@Override
+	public void setApplicationContext(ApplicationContext applicationContext) {
+		SpringContextHolder.applicationContext = applicationContext;
+	}
+
+	/**
+	 * 实现DisposableBean接口, 在Context关闭时清理静态变量.
+	 */
+	@Override
+	public void destroy() throws Exception {
+		SpringContextHolder.clearHolder();
+	}
+
+	/**
+	 * 检查ApplicationContext不为空.
+	 */
+	private static void assertContextInjected() {
+		Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");
+	}
+}