Spring boot 配置自己的拦截器

框架使用的是spring boot 2.0

首先，自定义拦截器实现HandlerInterceptor接口，preHandler是在执行controller方法前执行的  此外还有两个方法，具体作用最后才说，先熟悉以下拦截器的使用流程。

 1 @Component
 2 public class PassportInterceptor implements HandlerInterceptor{
 3     
 4     @Override
 5     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
 6             throws Exception {
 7         HttpSession session = request.getSession();
 8         User user  = (User)session.getAttribute("user");
 9         if(user == null) {
10             response.sendRedirect("/login");
11             return false;
12         }
13         return true;
14     }
15     
16 }

上面拦截器只是简单的通过session验证是否登录

定义了自己的拦截器后就要实现 WebMvcConfigurer接口 注：该接口好像是spring boot 2.0以后有的  之前不是这个接口 该接口提供了方法添加拦截器，加上@Component注解  让其能被ioc容器管理

 1 @Component
 2 public class LabWebConfiguration implements WebMvcConfigurer{
 3     
 4     @Autowired
 5     PassportInterceptor passportInterceptor;
 6     
 7     @Override
 8     public void addInterceptors(InterceptorRegistry registry) {
 9         
10         registry.addInterceptor(passportInterceptor)
11             .addPathPatterns("/**")
12             .excludePathPatterns("/stylesheets/**", "/javascripts/**","/fonts/**",
13                     "/images/**", "/login/**", "/regist/**");
14     }
15     
16 
17 }

registry有三个重要的方法，addInterceptors()方法将自定义的拦截器添加进去 addPathPatterns 方法的主要作用是添加拦截器要拦截的路径，excludePathPatterns的功能则是配置对某些路径放行。上面我针对自己的静态资源、还有登录注册页面放行

接下来做一个小小的测试  测试以下拦截器各个方法的执行顺序

 1 @Controller
 2 public class TestController {
 3 
 4     @RequestMapping("/test")
 5     @ResponseBody
 6     public String testInterceptor() {
 7         
 8         System.out.println("Controller方法执行");
 9         
10         return "test";
11     }
12     
13 }
 1 @Component
 2 public class TestInterceptor implements HandlerInterceptor{
 3     
 4     @Override
 5     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
 6             throws Exception {    
 7         System.out.println("preHandler执行了");    
 8         return true;
 9     }
10     @Override
11     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
12             ModelAndView modelAndView) throws Exception {
13         System.out.println("postHandler执行了");    
14     }
15     @Override
16     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
17             throws Exception {
18         // TODO Auto-generated method stub
19         System.out.println("afterCompletion执行了");    
20     }
21     
22 }
 1 @Component
 2 public class LabWebConfiguration implements WebMvcConfigurer{
 3     @Autowired
 4     TestInterceptor testInterceptor;
 5     
 6     @Override
 7         public void addInterceptors(InterceptorRegistry registry) {
 8             registry.addInterceptor(testInterceptor)
 9                 .addPathPatterns("/test");
10         }
11     
12 
13 }

结果如下

可见preHander方法只在Controller执行前   return true则放行 

postHandler则是在 具体的Controller方法执行后执行

afterCompletion  看资料说是在页面渲染完成后执行   因此可以用来作为资源的清理工作

 

posted @ 2018-09-12 11:09  Duo17  阅读(242)  评论(0)  编辑  收藏  举报