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SpringBoot登录拦截

IT盛夏的果实 人气:0

1 前言

注册登录可以说是平时开发中最常见的东西了,但是一般进入到公司之后,像这样的功能早就开发完了,除非是新的项目。这两天就碰巧遇到了这样一个需求,完成pc端的注册登录功能。

实现这样的需求有很多种方式:像

1)HandlerInterceptor+WebMvcConfigurer+ThreadLocal

2)Filter过滤器

3)安全框架Shiro(轻量级框架)

4)安全框架Spring Securety(重量级框架)

而我采用的是第一种 Spring HandlerInterceptor+WebMvcConfigurer+ThreadLocal技术来实现。

2 具体类

2.1HandlerInterceptor

HandlerInterceptor是springMVC中为拦截器提供的接口,类似于Servlet开发中的过滤器Filter,用于处理器进行预处理和后处理,需要重写三个方法。

preHandle:

调用时间:controller方法处理之前

执行顺序: 链式Intercepter情况下,Intercepter按照声明顺序一个接一个执行

若返回false,则中断执行,注意:不会进入afterCompletion

postHandle:

调用前提:preHandle返回true

调用时间:Controller方法处理完之后,DispatcherServlet进行视图渲染之前,也就是说在这个方法中可以对ModelAndView进行操作

执行顺序:链式Interceptor情况下,Intercepter按照声明顺序执行

备注:postHandle虽然是post开头,但是post请求,get请求都能处理

afterCompletion:

调用前提:preHandle返回true

调用时间:DispatcherServlet进行视图的渲染之后

多用于清理资源

2.2WebMvcConfigurer

WebMvcConfigurer配置类其实是Spring内部的一种配置方式,采用JavaBean的形式来代替传统的xml配置文件形式进行针对框架个性化定制,可以自定义一些Handler,Interceptor,ViewResolver,MessageConverter。基于java-based方式的spring mvc配置,需要创建一个配置类并实现WebMvcConfigurer接口;

在Spring Boot 1.5版本都是靠重写WebMvcConfigurerAdapter的方法来添加自定义拦截器,消息转换器等。SpringBoot 2.0 后,该类被标记为@Deprecated(弃用)。官方推荐直接实现WebMvcConfigurer或者直接继承WebMvcConfigurationSupport,方式一实现WebMvcConfigurer接口(推荐),方式二继承WebMvcConfigurationSupport类

3 代码实践

1)编写拦截器HeadTokenInterceptor使其继承HandlerInterceptor

package com.liubujun.config;
import com.liubujun.moudle.UserToken;
import com.liubujun.util.SecurityContextUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.ws.handler.Handler;
import java.io.IOException;
/**
 * @Author: liubujun
 * @Date: 2022/5/21 16:12
 */
@Component
@Slf4j
public class HeadTokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String authorization = request.getHeader("Authorization");
        if (authorization == null ) {
            unauthorized(response);
            return false;
        }
        //这里一般都会解析出userToken的值,这里为了方便就直接new了
        UserToken userToken  = new UserToken();
        SecurityContextUtil.addUser(userToken);
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        SecurityContextUtil.removeUser();
    }
    private void unauthorized(HttpServletResponse response) {
        response.setStatus(HttpStatus.UNAUTHORIZED.value());
        try {
            response.getWriter().append(HttpStatus.UNAUTHORIZED.getReasonPhrase());
        } catch (IOException e) {
            log.error("HttpServletResponse writer error.msg",HttpStatus.UNAUTHORIZED.getReasonPhrase());
            log.error(e.getMessage(),e);
        }
    }
}

2)编写MyWebMvcConfigurer使其继承WebMvcConfigurationSupport

package com.liubujun.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.ArrayList;
/**
 * @Author: liubujun
 * @Date: 2022/5/21 16:40
 */
@Configuration
public class MyWebMvcConfigurer extends WebMvcConfigurationSupport {
    @Autowired
    private HeadTokenInterceptor headTokenInterceptor;
    /**
     * 类似于白名单,在这边添加的请求不会走拦截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        ArrayList<String> pattres = new ArrayList<>();
        pattres.add("/login/login");
        registry.addInterceptor(headTokenInterceptor).excludePathPatterns(pattres).addPathPatterns("/**");
        super.addInterceptors(registry);
    }
    /**
     * 添加静态资源
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("xxx.html")
                .addResourceLocations("classpath:/META-INF/resources");
        super.addResourceHandlers(registry);
    }
}

3)编写ThreadLocal类存放用户信息

package com.liubujun.util;
import com.liubujun.moudle.UserToken;
import org.springframework.core.NamedThreadLocal;
/**
 * @Author: liubujun
 * @Date: 2022/5/23 9:41
 */
public class SecurityContextUtil {
    private static ThreadLocal<UserToken> threadLocal = new NamedThreadLocal<>("user");
    public static void addUser(UserToken user){
        threadLocal.set(user);
    }
    public static UserToken getUser(){
        return threadLocal.get();
    }
    public static void removeUser(){
        threadLocal.remove();
    }
    public static String getPhoneNumber(){
        return threadLocal.get().getPhoneNumber();
    }
    public static Integer getId(){
        return threadLocal.get().getId();
    }
    public static String getUserText(){
        return threadLocal.get().getUserText();
    }
}

4)编写测试controller

@RestController
@RequestMapping(value = "/login",produces = {"application/json;charset=UTF-8"})
public class Login {
    @PostMapping("/login")
    public String login(){
        return "登录请求不需要拦截";
    }
    @PostMapping("/other")
    public String other(){
        return "其他的请求需要拦截";
    }
}

5)测试

测试login接口,(不传token直接放行)

测试其他接口,不传token被拦截到

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