Token验证及自定义注解拦截注入

Token验证实现步骤：

 1. 实现自定义注解

　　1.0. @Login(拦截请求验证token，结合token实现单点登录，挂机时限) 与 @LoginUser(前台传入token转换为userID)

       图片示例：

　　　　     

 2. 拦截器的注册类

　　2.0. extends(继承)WebMvcConfigurerAdapter类 (继承WebMvcConfigurationSupport 类，implements(实现) WebMvcConfigurer接口，根据不同的开发环境选择不同方式)

　　WebMvcConfigurerAdapter : 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

package com.shengwei.businessschoolapi.config;

import com.shengwei.businessschoolapi.interceptor.AuthorizationInterceptor;
import com.shengwei.businessschoolapi.resolver.LoginUserHandlerMethodArgumentResolver;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.util.List;

@Configuration
public  class WebLoginHandlerConfig extends WebMvcConfigurerAdapter {

    @Autowired
    private AuthorizationInterceptor authorizationInterceptor;

    @Autowired
    private LoginUserHandlerMethodArgumentResolver loginUserHandlerMethodArgumentResolver;
   /*
    *重写拦截器：添加拦截请求方法 excludePathPatterns(不拦截请求) addPathPatterns(拦截的请求)
    *authorizationInterceptor：作用：拦截器实现   实现功能：用于每次请求验证Token（结合自定义注解@Login实现）
    */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(authorizationInterceptor).excludePathPatterns("/api/wxUser/login").addPathPatterns("/api/**");
    }
    /*
     *添加参数解析器
     *loginUserHandlerMethodArgumentResolver 实现功能如：不传参数情况下可通过@LoginUser实现数据注入（结合自定义注解@LoginUser实现）
     */
    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
        argumentResolvers.add(loginUserHandlerMethodArgumentResolver);
    }
}

3. 拦截器实现

package com.shengwei.businessschoolapi.interceptor;

import com.shengwei.businessschoolapi.annotation.Login;
import com.shengwei.businessschoolapi.exception.RRException;
import com.shengwei.businessschoolapi.model.TokenEntity;
import com.shengwei.businessschoolapi.service.TokenService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class AuthorizationInterceptor extends HandlerInterceptorAdapter {

    @Autowired
    private TokenService tokenService;

    //统一设置userId的 KEY值
    public static final String USER_KEY = "userId";

    //前台统一token的 KEY值
    public static final String LOGIN_TOKEN_KEY = "WM-SHOP-TOKEN";

    /*
     * preHandle()作用:在业务处理器处理请求之前被调用 预处理 可以进行编码 安全控制等处理
     *
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Login annotation;
        if(handler instanceof HandlerMethod) {
            annotation = ((HandlerMethod) handler).getMethodAnnotation(Login.class);
        }else{
            return true;
        }
        if(annotation == null){
            return true;
        }
        //从header中获取token
        String token = request.getHeader(LOGIN_TOKEN_KEY);
        //如果header中不存在token，则从参数中获取token
        if(StringUtils.isBlank(token)){
            token = request.getParameter("token");
        }
        //token为空
        if(StringUtils.isBlank(token)){
            throw new RRException("token不能为空");
        }
        //查询token信息
        TokenEntity tokenEntity = tokenService.queryByToken(token);
        if(tokenEntity == null || tokenEntity.getExpirationTime().getTime() < System.currentTimeMillis()){
            throw new RRException("token失效，请重新登录");
        }
        //设置userId到request里，后续根据userId，获取用户信息
        request.setAttribute(USER_KEY, tokenEntity.getUserid());
        return true;
    }
}

 

自定义注解拦截注入步骤：

 1. 实现自定义注解(这里我们用（@LoginUser）

 2. 添加参数解析器(这里我们用 LoginUserHandlerMethodArgumentResolver实现类)

 3. 实现参数解析器

package com.shengwei.businessschoolapi.resolver;

import com.shengwei.businessschoolapi.annotation.LoginUser;
import com.shengwei.businessschoolapi.exception.RRException;
import com.shengwei.businessschoolapi.service.TokenService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

@Component
public class LoginUserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
    @Autowired
    private TokenService tokenService;

    //前台统一token的 KEY值
    public static final String LOGIN_TOKEN_KEY = "WM-SHOP-TOKEN";

    /*
     *getParameterType().isAssignableFrom(Long.class):为参数注入类型判断  hasParameterAnnotation(LoginUser.class)为当前注解名称判断
     *当 retuer返回为true时 执行resolveArgument()方法
     */
    @Override
    public boolean supportsParameter(MethodParameter methodParameter) {
       return  methodParameter.getParameterType().isAssignableFrom(Long.class) &&  methodParameter.hasParameterAnnotation(LoginUser.class);
    }
    /*
     * 注入数据方法
     */
    @Override
    public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) {
        //获取用户token
        String token = nativeWebRequest.getHeader(LOGIN_TOKEN_KEY);
        if (token == null || token.isEmpty()) {
            new RRException("没有token");
        }
        //获取用户Id
        Long userId = tokenService.getUserId(token);
        if (userId == null) {

            new RRException("请登录");
        }
        return userId;
    }
}

 提示：使用环境springboot(1.5.8)