spring boot實現(xiàn)過濾器和攔截器demo

更新時間：2017年02月23日 16:19:09 作者：玲瓏骰子安紅豆

本篇文章主要介紹了spring boot實現(xiàn)過濾器和攔截器demo ，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

整理文檔，搜刮出一個spring boot實現(xiàn)過濾器和攔截器demo ，稍微整理精簡一下做下分享。

攔截器定義:

@WebServlet
public class ActionInterceptor implements HandlerInterceptor {

  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
      throws Exception {
    // System.out.println(">>>MyInterceptor1>>>>>>>在請求處理之前進行調用（Controller方法調用之前）");

    // 獲取系統(tǒng)時間
    Calendar ca = Calendar.getInstance();
    int hour = ca.get(Calendar.HOUR_OF_DAY);
    // 設置限制運行時間 0-4點
    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>>>>>>>請求處理之后進行調用，但是在視圖被渲染之前（Controller方法調用之后）");

  }

  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
      throws Exception {
    // System.out.println(">>>MyInterceptor1>>>>>>>在整個請求結束之后被調用，也就是在DispatcherServlet
    // 渲染了對應的視圖之后執(zhí)行（主要是用于進行資源清理工作）");
  }
}

攔截器使用: 關于注解我使用的是@Component 其實也可能聲明成配置

@Component
public class ApplicationConfig {extends WebMvcConfigurerAdapter 

  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    // 多個攔截器組成一個攔截器鏈
    // addPathPatterns 用于添加攔截規(guī)則
    // excludePathPatterns 用戶排除攔截
    registry.addInterceptor(new ActionInterceptor()).addPathPatterns("/service/extract/json/**");
    super.addInterceptors(registry);
  }
}

過濾器:

定義:

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 {
    // 獲取系統(tǒng)時間
    Calendar ca = Calendar.getInstance();
    int hour = ca.get(Calendar.HOUR_OF_DAY);
    // 設置限制運行時間 0-4點
    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", "此接口可以請求時間為:0-4點");
      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;
  }
  

}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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