整理文档，搜刮出一个spring boot实现过滤器和拦截器demo ，稍微整理精简一下做下分享。
拦截器定义:
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@WebServletpublic 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）"); }} |
拦截器使用: 关于注解 我使用的是@Component 其实也可能声明成配置
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@Componentpublic class ApplicationConfig {extends WebMvcConfigurerAdapter @Override public void addInterceptors(InterceptorRegistry registry) { // 多个拦截器组成一个拦截器链 // 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:
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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:
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@Componentpublic 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内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/erbiaoge/p/6422414.html
