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 *

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
@Slf4j
public 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;
@Component
public 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 * 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;

@Configuration
public 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")
@Slf4j
public 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。

来源：https://blog.csdn.net/qq_33556185/article/details/105420205