spring 容器工具类

1. 静态工具类方式（不推荐，sonar qube扫描有漏洞）

package com.yusys.init;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * 获取spring的容器，applicationContext    
 * 需要在 applicationContext.xml中注册这个bean，因为是静态方法，一旦注册，类可以直接获取ApplicationContext
 * <bean id="springContextContainer" class="com.yusys.init.SpringContextContainer" />
 * JournalLogService journalService = (JournalLogService) SpringContextContainer.getBean("journalLogService");
 * @author bestm
 *
 */
@Component
public class SpringContextContainer implements ApplicationContextAware {
	private static ApplicationContext applicationContext; // Spring应用上下文环境

	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	/**
	 * 实现ApplicationContextAware接口的回调方法，设置上下文环境
	 */
	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		SpringContextContainer.applicationContext = applicationContext;
	}

	@SuppressWarnings("unchecked")
	public static <T> T getBean(String beanName) {
		return (T) applicationContext.getBean(beanName);
	}

	public static <T> T getBean(Class<T> clazz) {
		return applicationContext.getBean(clazz);
	}
	
	//如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
	public static boolean containsBean(String name) {
		return applicationContext.containsBean(name);
	}
	
	//判断以给定名字注册的bean定义是一个singleton还是一个prototype
	public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
		return applicationContext.isSingleton(name);
	}
	
	public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
		return applicationContext.getType(name);
	}
	
	//如果给定的bean名字在bean定义中有别名，则返回这些别名
	public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
		return applicationContext.getAliases(name);
	}
	
}

2. 注入方式

package com.yl.util;

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.context.support.WebApplicationContextUtils;

/** 
 * spring容器工具类，这种方式优于继承ApplicationContextAware，注入spring，再提供静态方法（不安全）
* @author liuxb 
* @version 1.0  
* @date 2021年10月8日 下午2:43:53 
*/
public class ApplicationUtil {

	/**
	 * 获取spring容器
	 * @return
	 */
	public static WebApplicationContext getApplication() {
		ServletRequestAttributes requestAttribute = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
		HttpServletRequest request = requestAttribute.getRequest(); // 首先通过解耦合的方式获取到request

		// 获得IOC容器
		WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(request.getServletContext());
		return applicationContext;
	}
	
	/**
	 * 获取spring容器内注册的bean
	 * @param <T>
	 * @param beanName
	 * @param clazz
	 * @return
	 */
	public static <T> T getBean(String beanName, Class<T> clazz) {
		return (T) getApplication().getBean(beanName, clazz);
	}
	
	/**
	 * 获取spring容器内注册的bean
	 * @param <T>
	 * @param clazz
	 * @return
	 */
	public static <T> T getBean(Class<T> clazz) {
		return (T) getApplication().getBean(clazz);
	}
}