SpringBoot2.0 基础案例(05)：多个拦截器配置和使用场景

一、拦截器简介

1、拦截器定义

拦截器，请求的接口被访问之前，进行拦截然后在之前或之后加入某些操作。拦截是aop的一种实现策略。 拦截器主要用来按照指定规则拒绝请求。

2、拦截器中应用

token令牌验证
请求数据校验
用户权限校验
放行指定接口

二、springboot2.0拦截器用法

1、编写两个拦截器

自定义类实现handlerinterceptor接口
1）oneinterceptor 拦截器

import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.web.servlet.handlerinterceptor;
import org.springframework.web.servlet.modelandview;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
/**
 * 拦截器一
 */
public class oneinterceptor implements handlerinterceptor {
 private static final logger logger
 = loggerfactory.getlogger(oneinterceptor.class.getname());
 @override
 public boolean prehandle(httpservletrequest request,
 httpservletresponse response,
 object o) throws exception {
 string url =string.valueof(request.getrequesturl()) ;
 logger.info("1、url=="+url);
 // 放开拦截
 return true;
 }
 @override
 public void posthandle(httpservletrequest httpservletrequest,
 httpservletresponse httpservletresponse,
 object o, modelandview modelandview) throws exception {
 logger.info("1、posthandle");
 }
 @override
 public void aftercompletion(httpservletrequest httpservletrequest,
 httpservletresponse httpservletresponse,
 object o, exception e) throws exception {
 logger.info("1、aftercompletion");
 }
}

2）twointerceptor 拦截器

import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.web.servlet.handlerinterceptor;
import org.springframework.web.servlet.modelandview;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
/**
 * 拦截器二
 */
public class twointerceptor implements handlerinterceptor {
 private static final logger logger
 = loggerfactory.getlogger(twointerceptor.class.getname());
 @override
 public boolean prehandle(httpservletrequest request,
 httpservletresponse response,
 object o) throws exception {
 string url =string.valueof(request.getrequesturl()) ;
 logger.info("2、url=="+url);
 // 放开拦截
 return true;
 }
 @override
 public void posthandle(httpservletrequest httpservletrequest,
 httpservletresponse httpservletresponse,
 object o, modelandview modelandview) throws exception {
 logger.info("2、posthandle");
 }
 @override
 public void aftercompletion(httpservletrequest httpservletrequest,
 httpservletresponse httpservletresponse,
 object o, exception e) throws exception {
 logger.info("2、aftercompletion");
 }
}

2、web配置文件中注入拦截器

import com.boot.intercept.intercept.oneinterceptor;
import com.boot.intercept.intercept.twointerceptor;
import org.springframework.context.annotation.configuration;
import org.springframework.web.servlet.config.annotation.interceptorregistry;
import org.springframework.web.servlet.config.annotation.webmvcconfigurer;
/**
 * web配置文件
 */
@configuration
public class webmvcconfig implements webmvcconfigurer {
 public void addinterceptors(interceptorregistry registry) {
 // 拦截所有路径
 // 注册自定义两个拦截器
 registry.addinterceptor(new oneinterceptor()).addpathpatterns("/**");
 registry.addinterceptor(new twointerceptor()).addpathpatterns("/**");
 }
}

3、编写测试接口

import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.restcontroller;
@restcontroller
public class interceptcontroller {
 @requestmapping("/requrl")
 public string requrl (){
 return "success" ;
 }
}

4、访问测试接口

日志输出内容如下

intercept.oneinterceptor : 1、url==http://127.0.0.1:8005/requrl
intercept.twointerceptor : 2、url==http://127.0.0.1:8005/requrl
intercept.twointerceptor : 2、posthandle
intercept.oneinterceptor : 1、posthandle
intercept.twointerceptor : 2、aftercompletion
intercept.oneinterceptor : 1、aftercompletionla

拦截器的拦截顺序，是按照web配置文件中注入拦截器的顺序执行的。

三、源代码地址

github：知了一笑
https://github.com/cicadasmile/spring-boot-base