spring boot实现过滤器和 * demo

整理文档，搜刮出一个spring boot实现过滤器和 * demo ，稍微整理精简一下做下分享。

* 定义:

@WebServlet
public class ActionInterceptor implements HandlerInterceptor {

@Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
     throws Exception {
   // System.out.println(">>>MyInterceptor1>>>>>>>在请求处理之前进行调用（Controller方法调用之前）");

// 获取系统时间
   Calendar ca = Calendar.getInstance();
   int hour = ca.get(Calendar.HOUR_OF_DAY);
   // 设置限制运行时间 0-4点
   if (hour < 4) {
     return true;
   }
   return false;
 }

@Override
 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
     ModelAndView modelAndView) throws Exception {
   // System.out.println(">>>MyInterceptor1>>>>>>>请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）");

}

@Override
 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
     throws Exception {
   // System.out.println(">>>MyInterceptor1>>>>>>>在整个请求结束之后被调用，也就是在DispatcherServlet
   // 渲染了对应的视图之后执行（主要是用于进行资源清理工作）");
 }
}

* 使用:  关于注解 我使用的是@Component  其实也可能声明成配置

@Component
public class ApplicationConfig {extends WebMvcConfigurerAdapter

@Override
 public void addInterceptors(InterceptorRegistry registry) {
   // 多个 * 组成一个 * 链
   // addPathPatterns 用于添加拦截规则
   // excludePathPatterns 用户排除拦截
   registry.addInterceptor(new ActionInterceptor()).addPathPatterns("/service/extract/json/**");
   super.addInterceptors(registry);
 }
}

过滤器:

定义:

public class ActionFilter implements Filter {

@Override
 public void init(FilterConfig filterConfig) throws ServletException {

}

@Override
 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
     throws IOException, ServletException {
   // 获取系统时间
   Calendar ca = Calendar.getInstance();
   int hour = ca.get(Calendar.HOUR_OF_DAY);
   // 设置限制运行时间 0-4点
   if (hour < 4) {
     HttpServletResponse httpResponse = (HttpServletResponse) response;
     httpResponse.setCharacterEncoding("UTF-8");
     httpResponse.setContentType("application/json; charset=utf-8");

// 消息
     Map<String, Object> messageMap = new HashMap<>();
     messageMap.put("status", "1");
     messageMap.put("message", "此接口可以请求时间为:0-4点");
     ObjectMapper objectMapper=new ObjectMapper();
     String writeValueAsString = objectMapper.writeValueAsString(messageMap);
     response.getWriter().write(writeValueAsString);

} else {
     chain.doFilter(request, response);
   }

}

@Override
 public void destroy() {

}

}

使用:

@Component
public class ApplicationConfig {

@Bean
 public FilterRegistrationBean filterRegistrationBean() {
   FilterRegistrationBean registrationBean = new FilterRegistrationBean();
   ActionFilter actionFilter = new ActionFilter();
   registrationBean.setFilter(actionFilter);
   List<String> urlPatterns = new ArrayList<String>();
   urlPatterns.add("/service/extract/json/*");
   registrationBean.setUrlPatterns(urlPatterns);
   return registrationBean;
 }

}

来源：http://www.cnblogs.com/erbiaoge/p/6422414.html