spring boot 实现多个 interceptor 并指定顺序

不念不忘少年蓝@ 2021-06-10 20:39 840阅读 0赞

首先我们创建Interceptor，实现HandlerInterceptor覆写方法：  
一、下面我创建了三个拦截器：  
MyInterceptor，UserInterceptor，StudentInterceptor

@Component
    public class MyInterceptor implements HandlerInterceptor {
    
    	@Override
    	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    		System.out.println("MyInterceptor preHandle");
    		return true;
    	}
    
    	@Override
    	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    		System.out.println("MyInterceptor postHandle");
    	}
    
    	@Override
    	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    		System.out.println("MyInterceptor afterCompletion");
    	}
    }

@Component
    public class StudentInterceptor implements HandlerInterceptor {
    
    
    	@Override
    	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    		System.out.println("StudentInterceptor preHandle");
    		return true;
    	}
    
    	@Override
    	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    		System.out.println("StudentInterceptor postHandle");
    
    	}
    
    	@Override
    	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    		System.out.println("StudentInterceptor afterCompletion");
    
    	}
    }

@Component
    public class UserInterceptor implements HandlerInterceptor {
    
    	@Override
    	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
    		System.out.println("UserInterceptor preHandle");
    		return true;
    	}
    
    	@Override
    	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    		System.out.println("UserInterceptor postHandle");
    	}
    
    	@Override
    	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    		System.out.println("UserInterceptor afterCompletion");
    	}
    }

二、把拦截器加入到拦截器队列 实现WebMvcConfigurer

@Configuration
    public class MyAdapter implements WebMvcConfigurer {
    
    	@Resource
    	private MyInterceptor myInterceptor;
    
    	@Resource
    	private UserInterceptor userInterceptor;
    
    	@Resource
    	private StudentInterceptor studentInterceptor;
    
    	@Override
    	public void addInterceptors(InterceptorRegistry registry) {
    		//1.加入的顺序就是拦截器执行的顺序，
    		//2.按顺序执行所有拦截器的preHandle
    		//3.所有的preHandle 执行完再执行全部postHandle 最后是postHandle
    		registry.addInterceptor(studentInterceptor).addPathPatterns("/**");
    		registry.addInterceptor(myInterceptor).addPathPatterns("/**");
    		registry.addInterceptor(userInterceptor).addPathPatterns("/**");
            //4.也可以在最后调用order方法设置 执行顺序，推荐使用
            registry.addInterceptor(new LoginInterceptor())
                    .addPathPatterns("/**")
                    .excludePathPatterns("/**/*.js").order(Ordered.HIGHEST_PRECEDENCE);
    
    	}
    }

三、最后访问controller

@RestController
    public class TestController {
    
    	@RequestMapping("/test")
    	public String test() {
    		return "test";
    	}
    	
    }

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