动态获取上下文和Bean

SpringContextUtil

package cn.czyfwpla.sys.config;

import org.springframework.context.ApplicationContext;

/**
 * @description: 获取上下文环境
 * @author wonder
 * @date 2019/08/20 14:13
 */
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;
    }

    //通过名字获取上下文中的bean
    public static Object getBean(String name){
        return applicationContext.getBean(name);
    }

    //通过类型获取上下文中的bean
    public static Object getBean(Class<?> requiredType){
        return applicationContext.getBean(requiredType);
    }
}

在application中设置上下文

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        ConfigurableApplicationContext application = SpringApplication.run(Application.class, args);
        SpringContextUtil.setApplicationContext(application);
    }
}

通过springContextUtil获取上下文环境或Bean

public class QQAuthenticationManager implements AuthenticationManager {

    private LoadUser loadUser;

    private UserService userService;

    private List<SimpleGrantedAuthority> authorities = new ArrayList<>();

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        userService = (UserService)SpringContextUtil.getBean(UserService.class);
        loadUser = (LoadUser)SpringContextUtil.getBean(LoadUser.class);
        ServletRequestAttributes attr = (ServletRequestAttributes)RequestContextHolder.currentRequestAttributes();
        HttpSession session= attr.getRequest().getSession(true);
        String accessToken = authentication.getName();
        String openId = (String) authentication.getCredentials();
        session.setAttribute("qqOpenId",openId);
        SysUser sysUser = new SysUser();
        if (accessToken != null && openId != null) {
            sysUser = userService.getUserByQQOpenid(openId);
            if (sysUser == null){
                throw new UsernameNotFoundException("该用户未注册");
            }
        }
        return new UsernamePasswordAuthenticationToken(loadUser.loadUserByUsername(sysUser.getAccount()),null, authorities);
    }

}