简介

日常开发中或某些场景时，我们无法声明一个Spring管理的类或我们需要去动态获取Spring管理的类，以便调用该类的内部方法。此时可通过下面几种方法获取。

工具类方式获取

@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
        }
    }

    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }

}

直接方式获取

@Service
public class SupperInvoiceFactory {
    // 一级部署
    @Value("${deploy.model.isFirst}")
    public Boolean isFirst = Boolean.TRUE;

    @Value("${deploy.model.go.verify.model}")
    public Boolean isAisino = Boolean.TRUE;

    @Autowired
    private ApplicationContext applicationContext;

    public SupperInvoiceService build() {

        // 一级部署
        if (BooleanUtils.isTrue(isFirst)) {
            //  平台模式
            if (BooleanUtils.isTrue(isKxl)) {
                return applicationContext.getBean(FKxlSupperInvoiceServiceImpl.class);
            } else {
                return applicationContext.getBean(FSgccSupperInvoiceServiceImpl.class);
            }
        } else {
            // 二级平台模式
            if(BooleanUtils.isTrue(isKxl)){
                return applicationContext.getBean(SKxlSupperInvoiceServiceImpl.class);
            } else{
                return applicationContext.getBean(SSgccSupperInvoiceServiceImpl.class);
            }
        }
    }
}

结束语

动态获取到Spring管理类后，随意任你处置了😀