springboot的拦截器和过滤器实现

• springboot拦截器

说明：和springmvc一样去实现handlerinterceptor接口

import org.springframework.stereotype.component;
import org.springframework.web.servlet.handlerinterceptor;
import org.springframework.web.servlet.modelandview;

import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;

/**
 * 〈一句话功能简述〉<br>
 * todo(参数拦截器1)
 *
 * @author sunhan
 * @version 1.0.0
 * @since 2020/3/7 10:06 pm
 */
@component
public class parameterinterceptor1 implements handlerinterceptor {


    @override
    public boolean prehandle(httpservletrequest request, httpservletresponse response,
                             object handler) throws exception {
        system.out.println("进入了拦截器-----11111");
        return true;
    }

    @override
    public void posthandle(httpservletrequest request, httpservletresponse response,
                           object handler, modelandview modelandview) {

    }

    @override
    public void aftercompletion(httpservletrequest request, httpservletresponse response,
                                object handler, exception ex) {

    }
}

 

把自定义拦截器注册到webmvcconfigurer配置接口中：

重写addinterceptors方法，添加自定义拦截器的order，pathpatterns

import org.springframework.context.annotation.configuration;
import org.springframework.web.servlet.config.annotation.interceptorregistry;
import org.springframework.web.servlet.config.annotation.webmvcconfigurer;

/**
 * 〈一句话功能简述〉<br>
 * todo()
 *
 * @author sunhan
 * @version 1.0.0
 * @since 2020/3/7 10:25 pm
 */
@configuration
public class interceptconfiguration implements webmvcconfigurer {

    @override
    public void addinterceptors(interceptorregistry registry) {
        registry.addinterceptor(new parameterinterceptor1()).addpathpatterns("/get*");
        registry.addinterceptor(new parameterinterceptor2()).addpathpatterns("/save*");
    }
}

 

• springboot过滤器

说明：注解方式和注册方式

　　1、注解方式：

import org.springframework.core.annotation.order;

import javax.servlet.*;
import javax.servlet.annotation.webfilter;
import java.io.ioexception;

/**
 * 〈一句话功能简述〉<br>
 * todo()
 *
 * @author sunhan
 * @version 1.0.0
 * @since 2020/3/6 5:28 pm
 */
@webfilter(filtername = "requestparamfilter",urlpatterns = "/*")
@order(3)
public class requestparamfilter implements filter {
    @override
    public void init(filterconfig filterconfig) throws servletexception {

    }

    @override
    public void dofilter(servletrequest servletrequest, servletresponse servletresponse,
                         filterchain filterchain) throws ioexception, servletexception {
        system.out.println("sunhan---请求参数过滤器！---test1");
        filterchain.dofilter(servletrequest,servletresponse);
    }

    @override
    public void destroy() {

    }
}

　　注意：

　　1.1、注解方式需要@webfilter和@order放在filter实现类上。

　　1.2、注解方式需要@servletcomponentscan放在springbootapplication启动类上

　　

　　2、注册方式：

import javax.servlet.*;
import javax.servlet.http.httpservletrequest;
import java.io.ioexception;

public class myfilter implements filter {

    @override
    public void init(filterconfig arg0) throws servletexception {
    }

    @override
    public void dofilter(servletrequest srequest, servletresponse sresponse, filterchain filterchain)
            throws ioexception, servletexception {
        httpservletrequest request = (httpservletrequest) srequest;
        system.out.println("this is myfilter,url :"+request.getrequesturi());
        filterchain.dofilter(srequest, sresponse);
    }

    @override
    public void destroy() {
    }

}

　　注意：@bean放在一个方法中，然后通过springboot的filterregistrationbean注册到过滤链中

import org.springframework.boot.web.servlet.filterregistrationbean;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;

@configuration
public class webconfiguration {

    @bean
    public filterregistrationbean testfilterregistration() {
        filterregistrationbean registration = new filterregistrationbean();
        registration.setfilter(new myfilter());
        registration.addurlpatterns("/*");
        registration.setname("myfilter");
        registration.setorder(6);
        return registration;
    }

    @bean
    public filterregistrationbean test2filterregistration() {
        filterregistrationbean registration = new filterregistrationbean();
        registration.setfilter(new myfilter2());
        registration.addurlpatterns("/*");
        registration.setname("myfilter2");
        registration.setorder(1);
        return registration;
    }
}