关于网站排名优化需要怎么做,知名企业创新案例,网推软件,做网站的收获过滤器
1.工作原理 2.创建Filter
2.1通过注解的方式实现
//创建一个类#xff0c;实现Filter接口
WebFilter(urlPatterns /myfilter) //urlPatterns表示需要拦截的路径
public class MyFilter implements Filter {Overridepublic void doFilter(ServletReques…过滤器
1.工作原理 2.创建Filter
2.1通过注解的方式实现
//创建一个类实现Filter接口
WebFilter(urlPatterns /myfilter) //urlPatterns表示需要拦截的路径
public class MyFilter implements Filter {Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println(---------您已进入过滤器----------);filterChain.doFilter(servletRequest,servletResponse);}
}//启动类上定义一个过滤器扫描器
SpringBootApplication
ServletComponentScan(basePackages com.liuhaiyang.springboot.filter) //filter类的地址
public class SpringbootTest14Application {public static void main(String[] args) {SpringApplication.run(SpringbootTest14Application.class, args);}2.2 springboot的配置类实现
//写一个过滤器不使用注解
public class MyFilter implements Filter {Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println(---------您已进入过滤器222----------);filterChain.doFilter(servletRequest,servletResponse);}
}//定义一个配置类用于设定filter
Configuration
public class FilterConfig {Beanpublic FilterRegistrationBean myFilterRegistrationBean(){FilterRegistrationBean filterRegistrationBeannew FilterRegistrationBean(new MyFilter());//构造函数中传入的是自定义的filter对象//添加过滤路径filterRegistrationBean.addUrlPatterns(/user/*);//拦截路径return filterRegistrationBean;}如果想要实现重定向可以这么做
Slf4j
WebFilter(filterName first , urlPatterns /*)
Order(1)
public class Filter implements javax.servlet.Filter{Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println(---------您已进入过滤器---------);HttpServletRequest request (HttpServletRequest) servletRequest;HttpServletResponse response (HttpServletResponse) servletResponse;String url request.getRequestURI();if(url.contains(login)){filterChain.doFilter(servletRequest,servletResponse);log.info(放行);}else{//过滤器触发进行重定向跳转跳转到对应的控制器String destination /user/error; // 跳转目标RequestDispatcher dispatcher request.getRequestDispatcher(destination);dispatcher.forward(request, response);}}
}
