过滤器不用说了，项目中很多常用的地方，比如用户登录认证等。下面来看看如何创建一个Filter并交给Spring容器管理
1.新建MyFilter,要做的校验，可以在doFilter重载函数中进行
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
System.out.println("this is MyFilter,url :"+request.getRequestURI());
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public void destroy() {
}
}
2.将自定义 Filter 加入过滤链
import com.sqlb.qiqi.filter.MyFilter;
import org.apache.catalina.filters.RemoteIpFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class FilterConfiguration {
@Bean
public RemoteIpFilter remoteIpFilter() {
return new RemoteIpFilter();
}
@Bean
public FilterRegistrationBean testFilterRegistration() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new MyFilter());
registration.addUrlPatterns("/*");
registration.addInitParameter("paramName", "paramValue");
registration.setName("MyFilter");
registration.setOrder(1);
return registration;
}
}
添加完后启动项目，就可以生效了。访问任意的 Url，都会看到控制台打印如下信息：
this is MyFilter,url :/xxx
