在spring项目中，普通类注入获取Bean，实现ApplicationContextAware接口

Posted 2022-05-31 aizj

在平时spring项目中，某个不能注入Bean的项目中要获取Bean。

@Component
public class SpringUtil implements ApplicationContextAware 
    private static ApplicationContext applicationContext = null;

    public SpringUtil() 
    

    public void setApplicationContext(ApplicationContext arg0) throws BeansException 
        if (applicationContext == null) 
            applicationContext = arg0;
        

    

    public static ApplicationContext getApplicationContext() 
        return applicationContext;
    

    public static void setAppCtx(ApplicationContext webAppCtx) 
        if (webAppCtx != null) 
            applicationContext = webAppCtx;
        
    

    /**
     * 拿到ApplicationContext对象实例后就可以手动获取Bean的注入实例对象
     */
    public static <T> T getBean(Class<T> clazz) 
        return getApplicationContext().getBean(clazz);
    

    public static <T> T getBean(String name, Class<T> clazz) throws ClassNotFoundException 
        return getApplicationContext().getBean(name, clazz);
    

    public static final Object getBean(String beanName) 
        return getApplicationContext().getBean(beanName);
    

    public static final Object getBean(String beanName, String className) throws ClassNotFoundException 
        Class clz = Class.forName(className);
        return getApplicationContext().getBean(beanName, clz.getClass());
    

    public static boolean containsBean(String name) 
        return getApplicationContext().containsBean(name);
    

    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException 
        return getApplicationContext().isSingleton(name);
    

    public static Class<?> getType(String name) throws NoSuchBeanDefinitionException 
        return getApplicationContext().getType(name);
    

    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException 
        return getApplicationContext().getAliases(name);
    

　　在类中获取bean XXservice = (XXservice)SpringUtil.getBean(beanName);