springboot 拦截器（interceptor）

今天药忘吃喽~ 2021-09-15 13:36 538阅读 0赞

springmvc中有两种很普遍的AOP实现：  
1.过滤器（Filter）  
2.拦截器（Interceptor）

[之前文章已经介绍过filter的用法][filter]，这里重点介绍interceptor。

1）定义interceptor：

public class SessionInterceptor extends HandlerInterceptorAdapter {
    	private static String[] IGNORE_URI = {"/login.jsp", "/login/","/login","/loginIndex", "/error"};
    	private static Logger log = LoggerFactory.getLogger(SessionInterceptor.class);  
    	
    	@Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    		boolean flag = false;
            String url = request.getRequestURL().toString();
            
    		for (String s : IGNORE_URI) {
                if (url.contains(s)) {
                    flag = true;
                    break;
                }
            }
            if (!flag) {
            	Object obj = request.getSession().getAttribute(Constants.SESSION_USER);  
                if (null == obj) {//未登录
                	String servletPath = request.getServletPath();
                	log.error("session失效，当前url：" + url+";module Paht:"+servletPath);
                	if (request.getHeader("x-requested-with") != null && 
                					request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")){
                		
                		response.setHeader("sessionstatus", "timeout");//在响应头设置session状态  
                		response.setCharacterEncoding("text/html;charset=utf-8");
        				response.setContentType("text/html;charset=utf-8");
        				response.getWriter().print("error");
        	        } else {
        	        	response.sendRedirect(request.getContextPath()+"/user/loginIndex");
        	        }
                	return false;
                } else {
                	/*User user = (User)obj;
                	if(!RightUtil.hasRight(currentURLTemp, request)){
                		if(!"iisAdminTmp".equals(user.getName()) && !"/index".equals(targetURL)){
                			//response.sendRedirect(request.getContextPath()+"/login/login");//应该返回到没有权限的页面
                			//request.getRequestDispatcher("/login/login").forward(request, response);
                			return false;
                		}
                	}*/
                }
            }
            return super.preHandle(request, response, handler);
        }
    	 
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
            super.postHandle(request, response, handler, modelAndView);
        }

2）在springboot中，指定interceptor：

@Configuration
    public class MyMvcConfig extends WebMvcConfigurerAdapter {
    	/**
    	 * 静态资源配置
    	 */
    	/*@Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) {
            registry.addResourceHandler("/img/**")
                    .addResourceLocations("classpath:/imgs/");
            
            super.addResourceHandlers(registry);
        }*/
    	
    	/**
    	 * 默认首页配置
    	 */
    	@Override
        public void addViewControllers(ViewControllerRegistry registry) {
            registry.addViewController("/").setViewName("forward:/index");
            registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
            super.addViewControllers(registry);
        } 
    	
    	/**
         * interceptor配置
         */
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(new SessionInterceptor())
                    //添加需要验证登录用户操作权限的请求
                    .addPathPatterns("/**")
                    //排除不需要验证登录用户操作权限的请求
                    .excludePathPatterns("/css/**")
                    .excludePathPatterns("/js/**")
                    .excludePathPatterns("/images/**");
        }
    }

通过WebMvcConfigurerAdapter可以配置很多mvc的项，例如：interceptor、静态资源、首页等等。

[filter]: https://blog.csdn.net/liuxiao723846/article/details/80488016