Spring service locator, which can be used to obtain beans and springbeans from any place

Spring service locator, which can be used to obtain beans and springbeans from any place

By using the Spring Application Scenario ApplicationContext, bean can be obtained anywhere.

1 import org. apache. commons. logging. log; 2 import org. apache. commons. logging. logFactory; 3 import org. springframework. beans. factory. disposableBean; 4 import org. springframework. context. applicationContext; 5 import org. springframework. context. applicationContextAware; 6 7/** 8 * service locator 9 * for Spring applications, you can obtain bean.10 */11 public final class ServiceLocator implements ApplicationContextAware, Dispos AbleBean {12 13 private static Log logger = LogFactory. getLog (ServiceLocator. class); 14 private static ApplicationContext context = null; 15 16/*** 17 * implements the ApplicationContextAware interface and injects the Context into the static variable. 18 * @ param context19 */20 @ Override21 public void setApplicationContext (ApplicationContext context) {22 logger. debug ("Injected the ApplicationContext into ServiceLocator:" + context); 23 if (ServiceLocato R. context! = Null) {24 logger. debug ("[------------ ApplicationContext in the ServiceLocator" + 25 "is covered, as the original ApplicationContext is:" 26 + ServiceLocator. context + "------------]"); 27} 28 ServiceLocator. context = context; 29} 30 31/** 32 * implements the DisposableBean interface to clear static variables when Context is disabled. 33 */34 @ Override35 public void destroy () throws Exception {36 ServiceLocator. clear (); 37} 38 39/** 40 * Get ApplicationContext.41 * @ return42 */43 public static ApplicationContext getApplicationContext () {44 assertContextInjected (); 45 return context; 46} 47 48/** 49 * retrieve beans from Spring application scenarios and automatically convert them to the type of the assigned object. 50 * @ param name bean name 51 * @ return bean object 52 */53 @ SuppressWarnings ("unchecked") 54 public static <T> T getService (String name) {55 assertContextInjected (); 56 return (T) context. getBean (name); 57} 58 59/** 60 * retrieves beans from Spring application scenarios and automatically converts them to the type of the assigned object. 61 * @ param requiredType bean Class 62 * @ return bean object 63 */64 public static <T> T getService (Class <T> requiredType) {65 assertContextInjected (); 66 return context. getBean (requiredType); 67} 68 69/** 70 * clear ApplicationContext71 */72 public static void clear () {73 logger. debug ("Clear ApplicationContext in ServiceLocator:" + context); 74 context = null; 75} 76 77/** 78 * Check that ApplicationContext is not empty. 79 */80 private static void assertContextInjected () {81 if (context = null) {82 throw new IllegalStateException ("ApplicaitonContext not injected," + 83 "as defined in the context. xml ServiceLocator "); 84} 85} 86}View Code

 

Call the getService function, which is obtained by name and type.

1/*** get Bean from Spring application scenarios and automatically convert it to the type of the assigned object. 3 * @ param name bean name 4 * @ return bean object 5 */6 @ SuppressWarnings ("unchecked") 7 public static <T> T getService (String name) {8 assertContextInjected (); 9 return (T) context. getBean (name); 10} 11 12/** 13 * retrieves beans from Spring application scenarios and automatically converts them to the type of the assigned object. 14 * @ param requiredType bean Class 15 * @ return bean object 16 */17 public static <T> T getService (Class <T> requiredType) {18 assertContextInjected (); 19 return context. getBean (requiredType); 20}