springboot过滤器FilterRegistrationBean
有2种⽅式可以实现过滤器
1：通过FilterRegistrationBean实例注册
2：通过@WebFilter注解⽣效
这⾥选择第⼀种，因为第⼆种不能设置过滤器之间的优先级
为了演⽰优先级，这⾥创建2个测试过滤器类：Test1Filter、Test2Filter
通过实现javax.servlet.Filter接⼝，覆盖其doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)⽅法，决定拦截或放⾏public class Test1Filter implements Filter {
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest request=(HttpServletRequest)arg0;
System.out.println("⾃定义过滤器filter1触发，拦截url:"+RequestURI());
arg2.doFilter(arg0,arg1);
}
}
public class Test2Filter implements Filter {
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest request=(HttpServletRequest)arg0;
System.out.println("⾃定义过滤器filter2触发，拦截url:"+RequestURI());
arg2.doFilter(arg0,arg1);
}
}
通过在springboot的configuration中配置不同的FilterRegistrationBean实例，来注册⾃定义过滤器
这⾥创建⼀个configuration类
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import t.annotation.Bean;
import t.annotation.Configuration;
ample.demo.filter.Test1Filter;
ample.demo.filter.Test2Filter;
@Configuration
public class DemoConfiguration {
@Bean
public FilterRegistrationBean<Test1Filter> RegistTest1(){
//通过FilterRegistrationBean实例设置优先级可以⽣效
//通过@WebFilter⽆效
FilterRegistrationBean<Test1Filter> bean = new FilterRegistrationBean<Test1Filter>();
bean.setFilter(new Test1Filter());//注册⾃定义过滤器
bean.setName("flilter1");//过滤器名称
bean.addUrlPatterns("/*");//过滤所有路径
bean.setOrder(1);//优先级，最顶级
return bean;
}
@Bean
public FilterRegistrationBean<Test2Filter> RegistTest2(){
//通过FilterRegistrationBean实例设置优先级可以⽣效
//通过@WebFilter⽆效
FilterRegistrationBean<Test2Filter> bean = new FilterRegistrationBean<Test2Filter>();
bean.setFilter(new Test2Filter());//注册⾃定义过滤器
bean.setName("flilter2");//过滤器名称
bean.addUrlPatterns("/test/*");//过滤所有路径
bean.setOrder(6);//优先级，越低越优先
return bean;
}
}
其中
1第⼀个bean拦截所有路径，⽽第⼆个只拦截/test/*路径
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
spring framework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
如果把.addUrlPatterns()；中拦截路径改成⼀样/test/*，则所有请求，都会触发2个过滤器，⽽且过滤器1永远在最先拦截

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