SpringBoot自定义注解实现Token校验的方法

1.定义Token的注解，需要Token校验的接口，方法上加上此注解

import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface Token { boolean validate() default true;}

2.定义LoginUser注解，此注解加在参数上，用在需要从token里获取的用户信息的地方

import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target; @Target(ElementType.PARAMETER)@Retention(RetentionPolicy.RUNTIME)public @interface LoginUser {}

3.权限的校验拦截器

import com.example.demo.annotation.Token;import com.example.demo.entity.User;import lombok.extern.slf4j.Slf4j;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@Slf4jpublic class AuthorizationInterceptor extends HandlerInterceptorAdapter { public static final String USER_KEY = 'USER_ID'; public static final String USER_INFO = 'USER_INFO'; @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Token annotation; if(handler instanceof HandlerMethod) { annotation = ((HandlerMethod) handler).getMethodAnnotation(Token.class); }else{ return true; } //没有声明需要权限,或者声明不验证权限 if(annotation == null || annotation.validate() == false){ return true; } //从header中获取token String token = request.getHeader('token'); if(token == null){ log.info('缺少token，拒绝访问'); return false; } //查询token信息// User user = redisUtils.get(USER_INFO+token,User.class);// if(user == null){// log.info('token不正确，拒绝访问');// return false;// } //token校验通过，将用户信息放在request中，供需要用user信息的接口里从token取数据 request.setAttribute(USER_KEY, '123456'); User user=new User(); user.setId(10000L); user.setUserName('2118724165@qq.com'); user.setPhoneNumber('15702911111'); user.setToken(token); request.setAttribute(USER_INFO, user); return true; }}

4.写参数的解析器，将登陆用户对象注入到接口里

import com.example.demo.annotation.LoginUser;import com.example.demo.entity.User;import com.example.demo.interceptor.AuthorizationInterceptor;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.context.request.RequestAttributes;import org.springframework.web.method.support.HandlerMethodArgumentResolver;import org.springframework.web.method.support.ModelAndViewContainer;@Componentpublic class LoginUserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver{ @Override public boolean supportsParameter(MethodParameter methodParameter) { return methodParameter.getParameterType().isAssignableFrom(User.class)&&methodParameter.hasParameterAnnotation(LoginUser.class); } @Override public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception { //获取登陆用户信息 Object object = nativeWebRequest.getAttribute(AuthorizationInterceptor.USER_INFO, RequestAttributes.SCOPE_REQUEST); if(object == null){ return null; } return (User)object; }}

5.配置拦截器和参数解析器

import com.example.demo.interceptor.AuthorizationInterceptor;import com.example.demo.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.WebMvcConfigurer;import java.util.List; @Configurationpublic class WebMvcConfig implements WebMvcConfigurer { @Autowired private AuthorizationInterceptor authorizationInterceptor; @Autowired private LoginUserHandlerMethodArgumentResolver loginUserHandlerMethodArgumentResolver; @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(authorizationInterceptor).addPathPatterns('/api/**'); } @Override public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) { argumentResolvers.add(loginUserHandlerMethodArgumentResolver); }}

7.测试类

import com.example.demo.annotation.LoginUser;import com.example.demo.annotation.Token;import com.example.demo.entity.User;import lombok.extern.slf4j.Slf4j;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController; @RestController@RequestMapping(value = '/api')@Slf4jpublic class TestController { @RequestMapping(value='/test',method = RequestMethod.POST) @Token public String test(@LoginUser User user){ System.out.println('需要token才可以访问，呵呵……'); log.info('user：'+user.toString()); return 'test'; } @RequestMapping(value='/noToken',method = RequestMethod.POST) public String noToken(){ System.out.println('不用token就可以访问……'); return 'test'; }}

至此，自定义注解实现token校验就大功告成了。

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