springboot 自动配置和拦截器相关

=========================
AUTO‐CONFIGURATION REPORT
=========================
Positive matches:（自动配置类启用的）
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
DispatcherServletAutoConfiguration matched:

‐ @ConditionalOnClass found required class
'org.springframework.web.servlet.DispatcherServlet'; @ConditionalOnMissingClass did not find
unwanted class (OnClassCondition)
‐ @ConditionalOnWebApplication (required) found StandardServletEnvironment
(OnWebApplicationCondition)
Negative matches:（没有启动，没有匹配成功的自动配置类）
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
ActiveMQAutoConfiguration:
Did not match:
‐ @ConditionalOnClass did not find required classes 'javax.jms.ConnectionFactory',
'org.apache.activemq.ActiveMQConnectionFactory' (OnClassCondition)
AopAutoConfiguration:
Did not match:
‐ @ConditionalOnClass did not find required classes
'org.aspectj.lang.annotation.Aspect', 'org.aspectj.lang.reflect.Advice' (OnClassCondition)

public class LoginHandlerInterceptor implements HandlerInterceptor {
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if(user == null){
            //未登陆，返回登陆页面
            request.setAttribute("msg","没有权限请先登陆");
            request.getRequestDispatcher("/index.html").forward(request,response);
            return false;
        }else{
            //已登陆，放行请求
            return true;
        }

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

public class TestFilter extends HandlerInterceptorAdapter {
	private final Logger logger = LoggerFactory.getLogger(TestFilter.class);
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		logger.info("request请求地址path[{}] uri[{}]", request.getServletPath(),request.getRequestURI());
		//request.getHeader(String) 从请求头中获取数据
		//从请求头中获取用户token（登陆凭证根据业务而定）
		Long userId= getUserId(request.getHeader("H-User-Token"));
		if (userId != null && checkAuth(userId,request.getRequestURI())){
			return true;
		}
		//这里的异常是我自定义的异常，系统抛出异常后框架捕获异常然后转为统一的格式返回给前端， 其实这里也可以返回false
		throw new FastRuntimeException(20001,"No access");
	}

	/**
	 * 根据token获取用户ID
	 * @param userToken
	 * @return
	 */
	private Long getUserId(String userToken){
		Long userId = null;
		return userId;
	}

	/**
	 * 校验用户访问权限
	 * @param userId
	 * @param requestURI
	 * @return
	 */
	private boolean checkAuth(Long userId,String requestURI){
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
						   ModelAndView modelAndView) throws Exception {}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {}
}

//使用WebMvcConfigurerAdapter可以来扩展SpringMVC的功能
//@EnableWebMvc   不要接管SpringMVC
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
       // super.addViewControllers(registry);
        //浏览器发送 /atguigu 请求来到 success
        registry.addViewController("/atguigu").setViewName("success");
    }

    //所有的WebMvcConfigurerAdapter组件都会一起起作用
    @Bean //将组件注册在容器
    public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
        WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {
            @Override
            public void addViewControllers(ViewControllerRegistry registry) {
                registry.addViewController("/").setViewName("login");
                registry.addViewController("/index.html").setViewName("login");
                registry.addViewController("/main.html").setViewName("dashboard");
            }

            //注册拦截器
            @Override
            public void addInterceptors(InterceptorRegistry registry) {
                super.addInterceptors(registry);
                //静态资源；  *.css , *.js
                //SpringBoot已经做好了静态资源映射
                registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**")                        .excludePathPatterns("/index.html","/","/user/login");
            }
        };
        return adapter;
    }

    @Bean
    public LocaleResolver localeResolver(){

        return new MyLocaleResolver();
    }

}