Java在ServletContextListener、过滤器、拦截器解决对象无法注入问题

1、通用方法：

// 数据库日志操作对象

private LogInfoServiceIFC logInfoServiceProxy;

@Override

public void contextInitialized(ServletContextEvent event) {

　　WebApplicationContext context = WebApplicationContextUtils

　　.getRequiredWebApplicationContext(event.getServletContext());

　　logInfoServiceProxy = (LogInfoServiceIFC) context.getBean("logInfoService");

}

2、SpringMVC项目可直接在类方法中加入下面这句话：

SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);

3.从网上看到的，类似1，过滤器中注入对象，可行

工具类：

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
@Slf4j
@Component
public class SpringUtils implements ApplicationContextAware {
    private static ApplicationContext applicationContext;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        if (SpringUtils.applicationContext == null) {
            SpringUtils.applicationContext = applicationContext;
        }
    }
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
    //根据name
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }
    //根据类型
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }
}

使用：

if (userService == null) {
    userService = (UserService) SpringUtils.getBean("userServiceImpl");
}