Spring Boot之过滤器

使用步骤：
1.建立Filter类。实现Filter接口

---

@WebFilter(filterName = "test", urlPatterns = "/success/*")
public class UrlFilter implements Filter {

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

    System.out.println("----------------------->过滤器被创建");
}

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

    HttpServletRequest req = (HttpServletRequest) servletRequest;
    String requestURI = req.getRequestURI();
    System.out.println("--------------------->过滤器：请求地址"+requestURI);
    if(!requestURI.contains("info")){
        servletRequest.getRequestDispatcher("/failed").forward(servletRequest, servletResponse);
    }else{
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

@Override
public void destroy() {

    System.out.println("----------------------->过滤器被销毁");
}

}

2.为Filter加注解。
3。在主类上加包扫描。