java拦截器（interceptor）

1.声明式

（1）注解，使用Aspect的@Aspect

 （2）实现HandlerInterceptor

 1 /**
 2  * 拦截请求
 3  * 
 4  * @author Administrator
 5  *
 6  */
 7 @Component
 8 public class RequestHandlerInterceptor implements HandlerInterceptor {
 9     @Resource
10     private RedisUtil redisUtil;
11 
12     @Override
13     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
14             throws Exception {
15         String address = request.getParameter("address");
16         if (redisUtil.get(address) != null && StringUtils.isNotBlank(String.valueOf(address))) {
17             response.setCharacterEncoding("gbk");
18             ResultObject ro = ResultObject.fail().add("result", "水肥机器正在执行中，该命令不能同步执行");
19             PrintWriter pw = response.getWriter();
20             pw.write(JSONObject.toJSONString(ro));
21             return false;
22         } else {
23             System.out.println("下发地址---------------" + address);
24         }
25         
26         return HandlerInterceptor.super.preHandle(request, response, handler);
27     }
28 
29     @Override
30     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
31             ModelAndView modelAndView) throws Exception {
32         // TODO Auto-generated method stub
33         HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
34     }
35 
36     @Override
37     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
38             throws Exception {
39         // TODO Auto-generated method stub
40         HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
41     }
42 
43 }

View Code

添加拦截器，实现WebMvcConfigurer

/**
 * @author Administrator
 *
 */
@Configuration
public class RequestConfigurerAdapter implements WebMvcConfigurer {
    @Autowired
    private RequestHandlerInterceptor requestHandlerInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // TODO Auto-generated method stub
        WebMvcConfigurer.super.addInterceptors(registry);
        registry.addInterceptor(this.requestHandlerInterceptor).addPathPatterns("/**");
    }

}

（3）配置

使用aop空间中的相关标签