SpringBoot 过滤器与拦截器实例演示

springboot中的过滤器拦截器操作与springmvc中的几乎一样所以这里也不过多介绍了，下面举两个简单的栗子演示一下

1、过滤器

1 创建过滤器类loginfilter,实现rvlet包下的filter接口（包不要导错），加入注解webfilter

package com.example.filter; import javax.rvlet.*;import javaxperform.rvlet.annotation.webfilter;import javax.rvlet.http.httprvletrequest;import javax.rvlet.http.httprvletrespon;import java.io.ioexception; @webfilter(urlpatterns = "/filter/*")public class loginfilter implements filter {    @override    public void init(filterconfig filterconfig) throws rvletexception {        system.out.println("初始化拦截器");    }     @override    public void dofilter(rvletrequest rvletrequest, rvletrespon rvletrespon, filterchain filterchain) throws ioexception, rvletexception {        system.out.pr双十二什么时候开始的intln("loginfilter");        httprvletrequest request = (httprvletrequest)rvletrequest;        httprvletrespon respon = (httprvletrespon)rvletrespon;        //放行        filterchain.dofilter(request,respon);    }     @override    public void destroy() {        system.out.println("拦截器销毁");    }}

2 创建测试类logincotroller

package com.example.controller; import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.bind.annotation.restcontroller; @restcontroller@requestmapping("/filter")public class filtercontroller {     @requestmapping("/login")    public string login(){        system.out.println("登录");        return "login";    } }

3 在启动类上加注解

package com.example; import org.springframework.boot.springapplication;import org.springframework.boot.autoconfigure.springbootapplication;import org.springframework.boot.web.rvlet.rvletcomponentscan; @springbootapplication@rvletcomponentscan//rvlet、filter、listener可以直接通过@webrvlet、@webfilter、@weblistener注解自动注册public class demoapplication {     public static void main(string[] args) {        springapplication.run(demoapplication.class, args);    } }

4 启动测试，启动的时候可以看到filter调用init方法初始化

接着访问可以看到页面输出

控制台打印出拦截器中的语句

2、拦截器

1 创建自定义拦截器

package com.example.interceptor; import org.springframework.web.rvlet.handlerinterceptor;import org.springframework.web.rvlet.modelandview; import javax.rvlet.http.httprvletrequest;import javax.rvlet.http.httprvletrespon; public class myinterceptor implements handlerinterceptor {   //进入controller方法之前调用的    @override    public boolean prehandle(httprvl少儿编程培训机构etrequest request, httprvletrespon respon, object handler) throws exception {        system.out.println("prehandle");        return true;//true表示放行 fal表示不放行    }    //调用完controller之同音字组词后，视图渲染层之前    @override    public void posthandle(httprvletrequest request, httprvletrespon respon, object handler, modelandview modelandview) throws exception {        system.out.println("posthandle");    }    //页面跳转之后，整个流程执行之后，一般用于资源的清理    @override    public void aftercompletion(httprvletrequest request, httprvletrespon respon, object handler, exception ex) throws exception {        system.out.println("aftercompletion");    }}

2 创建拦截器配置类，注意要加上配置类的注解

package com.example.config; import com.example.interceptor.myinterceptor;import org.springframework.context.annotation.configuration;import org.springframework.web.rvlet.config.annotation.interceptorregistry;import org.springframework.web.rvlet.config.annotation.webmvcconfigurer; @configurationpublic class myinterceptorconfig implements webmvcconfigurer {     @override    public void addinterceptors(interceptorregistry registry) {        //设置拦截器并指定拦截路径        registry.addinterceptor(new myinterceptor()).addpathpatterns("/interceptor/*");        //registry.addinterceptor(new myinterceptor()).addpathpatterns("/**");//拦截所有        //registry.addinterceptor(new myinterceptor()).addpathpatterns("/**").excludepathpatterns("/test");//指定不拦截         //添加自定义拦截器        webmvcconfigurer.super.addinterceptors(registry);    }}

3 创建logincontroller测试类

package com.example.controller; import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.bind.annotation.restcontroller; @restcontroller@requestmapping("/intercep这就是我作文tor")public class interceptorcontroller {    @requestmapping("login")    public string login(){        system.out.println("interceptor-login");        return "login";    }}

4 运行访问，查看效果

控制台输出如下

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