过滤器实现方式

    1. 通过FilterRegistrationBean实例注册 （优点可以设置多个自定义过滤器的顺序）
    2. 通过注解@WebFilter生效

    exp:

    1. public class Test1Filter implements Filter {
    3.     @Override
    4.     public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
    5.             throws IOException, ServletException {
    6.         // TODO Auto-generated method stub
    7.         HttpServletRequest request=(HttpServletRequest)arg0;
    8.         System.out.println("自定义过滤器filter1触发,拦截url:"+request.getRequestURI());
    9.         arg2.doFilter(arg0,arg1);
    10.     }
    12. }
    1. public class Test2Filter implements Filter {
    3.     @Override
    4.     public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
    5.             throws IOException, ServletException {
    6.         // TODO Auto-generated method stub
    7.         HttpServletRequest request=(HttpServletRequest)arg0;
    8.         System.out.println("自定义过滤器filter2触发,拦截url:"+request.getRequestURI());
    9.         arg2.doFilter(arg0,arg1);
    10.     }
    12. }
    1. import org.springframework.boot.web.servlet.FilterRegistrationBean;
    2. import org.springframework.context.annotation.Bean;
    3. import org.springframework.context.annotation.Configuration;
    5. import com.example.demo.filter.Test1Filter;
    6. import com.example.demo.filter.Test2Filter;
    8. @Configuration
    9. public class DemoConfiguration {
    11.     @Bean
    12.     public FilterRegistrationBean<Test1Filter> RegistTest1(){
    13.         //通过FilterRegistrationBean实例设置优先级可以生效
    14.         //通过@WebFilter无效
    15.         FilterRegistrationBean<Test1Filter> bean = new FilterRegistrationBean<Test1Filter>();
    16.         bean.setFilter(new Test1Filter());//注册自定义过滤器
    17.         bean.setName("flilter1");//过滤器名称
    18.         bean.addUrlPatterns("/*");//过滤所有路径
    19.         bean.setOrder(1);//优先级，最顶级
    20.         return bean;
    21.     }
    22.     @Bean
    23.     public FilterRegistrationBean<Test2Filter> RegistTest2(){
    24.         //通过FilterRegistrationBean实例设置优先级可以生效
    25.         //通过@WebFilter无效
    26.         FilterRegistrationBean<Test2Filter> bean = new FilterRegistrationBean<Test2Filter>();
    27.         bean.setFilter(new Test2Filter());//注册自定义过滤器
    28.         bean.setName("flilter2");//过滤器名称
    29.         bean.addUrlPatterns("/test/*");//过滤所有路径
    30.         bean.setOrder(6);//优先级，越低越优先
    31.         return bean;
    32.     }
    33. }
    1. 其中
    3. 1第一个bean拦截所有路径，而第二个只拦截/test/*路径
    5. 2第一个bean优先级设置了1，而第二个设置了6，越低越优先，所以过滤器1应该在过滤器2前面拦截
    7. 运行springboot，访问/test/*请求如下图，再访问/v请求如下图只拦截了过滤器1，而过滤器2路径不匹配