项目中用SpringContextHolderUtil获取实例Bean
/**
-
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.
-
@classname SpringContextHolderUtil
-
@author xzxt
-
@date 2019/3/11
*/
@Service
@Lazy(false)
public class SpringContextHolderUtil implements ApplicationContextAware, DisposableBean {private static ApplicationContext applicationContext = null;
private static Logger logger = LoggerFactory.getLogger(SpringContextHolderUtil.class);
/**
- 取得存储在静态变量中的ApplicationContext
- @author xzxt
- @date 2019/3/11 15:41
- @return ApplicationContext对象
*/
public static ApplicationContext getApplicationContext() {
assertContextInjected();
return applicationContext;
}
/**
- 获取系统根目录
- @author xzxt
- @date 2019/3/11 15:42
- @return 系统根目录
*/
public static String getRootRealPath(){
String rootRealPath ="";
try {
rootRealPath=getApplicationContext().getResource("").getFile().getAbsolutePath();
} catch (IOException e) {
logger.warn(“获取系统根目录失败”);
}
return rootRealPath;
}
/**
- 获取系统根目录
- @author xzxt
- @date 2019/3/11 15:42
- @return 系统根目录
*/
public static String getResourceRootRealPath(){
String rootRealPath ="";
try {
rootRealPath=new DefaultResourceLoader().getResource("").getFile().getAbsolutePath();
} catch (IOException e) {
logger.warn(“获取资源根目录失败”);
}
return rootRealPath;
}
/**
- 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
- @author xzxt
- @date 2019/3/11 15:43
- @param name bean名称
- @return 赋值对象的类型
*/
@SuppressWarnings(“unchecked”)
public static 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.
- @author xzxt
- @date 2019/3/11 15:44
- @param requiredType 赋值对象class实例
- @return 赋值对象的类型
*/
public static T getBean(Class requiredType) {
assertContextInjected();
return applicationContext.getBean(requiredType);
}
/**
- 清除SpringContextHolder中的ApplicationContext为Null
- @author xzxt
- @date 2019/3/11 15:46
*/
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.
-
@author xzxt
-
@date 2019/3/11 15:46
-
@param applicationContext
*/
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
if (SpringContextHolderUtil.applicationContext != null) {
logger.info(“SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:” + SpringContextHolderUtil.applicationContext);
}SpringContextHolderUtil.applicationContext = applicationContext;
}
/**
- 实现DisposableBean接口, 在Context关闭时清理静态变量.
- @author xzxt
- @date 2019/3/11 15:48
- @throws Exception
*/
@Override
public void destroy() throws Exception {
SpringContextHolderUtil.clearHolder();
}
/**
- 检查ApplicationContext不为空
- @author xzxt
- @date 2019/3/11 15:48
*/
private static void assertContextInjected() {
Validate.notNull(applicationContext, “applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.”);
}
}