获取Spring的ApplicationContext上下文对象

心已赠人 2023-10-02 18:23 97阅读 0赞

### 1.继承ApplicationObjectSupport类 ###

@Component
    public class MyController  extends ApplicationObjectSupport {
        
    //....
    
    }

### 2. 从容器中拿出来 ###

@Component
    public class MyController  {
        
    
        @Autowired
        private ApplicationContext applicationContext;
    
    }

### 3. 继承ApplicationContextAware 实现静态调用 ###

import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.web.context.support.WebApplicationContextUtils;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    @Component
    public class SpringContextHolder implements ApplicationContextAware {
        
    
        private static ApplicationContext applicationContext;
    
        /**
         * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.
         */
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) {
        
            SpringContextHolder.applicationContext = applicationContext; // NOSONAR
        }
    
        /**
         * 取得存储在静态变量中的ApplicationContext.
         */
        public static ApplicationContext getApplicationContext() {
        
            checkApplicationContext();
            return applicationContext;
        }
    
        /**
         * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
         */
        @SuppressWarnings("unchecked")
        public static <T> T getBean(String name) {
        
            checkApplicationContext();
            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.
         */
        @SuppressWarnings("unchecked")
        public static <T> T getBean(Class<T> clazz) {
        
            checkApplicationContext();
            return (T) applicationContext.getBeansOfType(clazz);
        }
    
        /**
         * 清除applicationContext静态变量.
         */
        public static void cleanApplicationContext() {
        
            applicationContext = null;
        }
    
        private static void checkApplicationContext() {
        
            if (applicationContext == null) {
        
                throw new IllegalStateException(
                        "applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");
            }
        }
    
    
        public static void setHttpRequestResponseHolder(HttpServletRequest request, HttpServletResponse response){
        
            responseThreadLocal.set(response);
            ApplicationContext ap = WebApplicationContextUtils.getWebApplicationContext(null);
        }
        public static HttpServletResponse getHttpResponse(){
        
            return responseThreadLocal.get();
        }
    
        public static void clean(){
        
            responseThreadLocal.remove();
        }
    
        private static final ThreadLocal<HttpServletResponse> responseThreadLocal = new ThreadLocal();
    
    
    }

### 启动类里直接赋值 ###

public class SpringContextUtil {
        
        private static ApplicationContext applicationContext;
            //获取上下文
        public static ApplicationContext getApplicationContext() {
        
            return applicationContext;
        }
        //设置上下文
        public static void setApplicationContext(ApplicationContext applicationContext) {
        
            SpringContextUtil.applicationContext = applicationContext;
        }
    }

@SpringBootApplication
    public class Application {
        
        public static void main(String[] args) {
        
            ApplicationContext app =  SpringApplication.run(Application.class, args);
            SpringContextUtil.setApplicationContext(app);
        }

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