本文介绍了一种自定义Spring Bean获取器的实现方法，通过实现ApplicationContextAware接口，提供了静态方法来获取ApplicationContext上下文和注册的Bean实例。该方法允许在Spring应用中方便地获取任意Bean，无需直接依赖于ApplicationContext。
自定义SpringContextHolder获取实例对象
import org.springframework.stereotype.*;
import org.springframework.context.*;
import java.util.*;
@Component
public class SpringContextHolder implements ApplicationContextAware
{
private static ApplicationContext applicationContext;
public void setApplicationContext(final ApplicationContext applicationContext) {
SpringContextHolder.applicationContext = applicationContext;
}
public static ApplicationContext getApplicationContext() {
checkApplicationContext();
return SpringContextHolder.applicationContext;
}
public static <T> T getBean(final String name) {
checkApplicationContext();
return (T)SpringContextHolder.applicationContext.getBean(name);
}
public static <T> T getBean(Class<T> clazz) {
checkApplicationContext();
Map beanMaps = SpringContextHolder.applicationContext.getBeansOfType((Class)clazz);
if (beanMaps != null && !beanMaps.isEmpty()) {
return beanMaps.values().iterator().next();
}
return null;
}
public static boolean containsBean(String name) {
return SpringContextHolder.applicationContext.containsBean(name);
}
private static void checkApplicationContext() {
if (SpringContextHolder.applicationContext == null) {
throw new IllegalStateException("未获取到实例对象");
}
}
}
获取bean实例
SpringContextHolder.getBean("PCServiceTemplateImpl");
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