Spring Boot的filter（过滤器）简单使用实例详解

过滤器（filter）的注册方法和 servlet 一样，有两种方式：代码注册或者注解注册

1.代码注册方式

通过代码方式注入过滤器

@bean
  public filterregistrationbean indexfilterregistration() {
    filterregistrationbean registration = new filterregistrationbean(new indexfilter());
    registration.addurlpatterns("/");
    return registration;
  }

indexfilter.java类：

package com.example.filter;
import java.io.ioexception;
import javax.servlet.filter;
import javax.servlet.filterchain;
import javax.servlet.filterconfig;
import javax.servlet.servletexception;
import javax.servlet.servletrequest;
import javax.servlet.servletresponse;
public class indexfilter implements filter{
  @override
  public void destroy() {
    system.out.println("filter destroy method");
  }
  @override
  public void dofilter(servletrequest arg0, servletresponse arg1, filterchain arg2)
      throws ioexception, servletexception {
    system.out.println("filter dofilter method");
  }
  @override
  public void init(filterconfig arg0) throws servletexception {
    system.out.println("filter init method");
  }
}

2.注解方式

通过注解方式注入过滤器

indexfilter2.java类

package com.example.filter;
import java.io.ioexception;
import javax.servlet.filter;
import javax.servlet.filterchain;
import javax.servlet.filterconfig;
import javax.servlet.servletexception;
import javax.servlet.servletrequest;
import javax.servlet.servletresponse;
import javax.servlet.annotation.webfilter;
@webfilter(urlpatterns = "/*", filtername = "indexfilter2")
public class indexfilter2 implements filter{
  @override
  public void destroy() {
    system.out.println("filter2 destroy method");
  }
  @override
  public void dofilter(servletrequest arg0, servletresponse arg1, filterchain arg2)
      throws ioexception, servletexception {
    system.out.println("filter2 dofilter method");
  }
  @override
  public void init(filterconfig arg0) throws servletexception {
    system.out.println("filter2 init method");
  }
}

把注解加到入口处启动即可

@springbootapplication
@servletcomponentscan
public class springbootsimpleapplication {
  public static void main(string[] args) {
    springapplication.run(springbootsimpleapplication.class, args);
  }
}

以上所述是小编给大家介绍的spring boot的filter（过滤器）简单使用，希望对大家有所帮助