本篇文章为大家展示了怎么在SpringBoot中通过自定义注解实现一个Token校验功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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;}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 {}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; }}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; }}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); }}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"; }}上述内容就是怎么在SpringBoot中通过自定义注解实现一个Token校验功能，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注编程网行业资讯频道。
