Springboot+jwt实现token校验

1. pom.xml

2. JwtInterceptor.java

3. JwtToken.java

4. JwtUtil.java

5. WebConfig.java

6. GlobalExceptionHandler.java

7. pox.xml

 		<dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.8.1</version>
        </dependency>

2. JwtInterceptor.java

import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

public class JwtInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) {
        // 从 http 请求头中取出 token
        String token = httpServletRequest.getHeader("token");
        // 如果不是映射到方法直接通过
        if(!(object instanceof HandlerMethod)){
            return true;
        }
        HandlerMethod handlerMethod=(HandlerMethod)object;
        Method method=handlerMethod.getMethod();
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(JwtToken.class)) {
            JwtToken jwtToken = method.getAnnotation(JwtToken.class);
            if (jwtToken.required()) {
                // 执行认证
                if (token == null) {
                    throw new RuntimeException("无token，请重新登录");
                }
                // 获取 token 中的 userId
                String userId = JwtUtil.getUserId(token);
                System.out.println("用户id:" + userId);
                // 验证 token
                JwtUtil.checkSign(token);
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

3. JwtToken.java

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface JwtToken {
    boolean required() default true;
}

4. JwtUtil.java

import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.util.Date;

public class JwtUtil {

    /**
     * 过期时间30分钟
     */
    private static final long EXPIRE_TIME = 30 * 60 * 1000;
    /**
     * jwt 密钥
     */
    private static final String SECRET = "jwt_secret";

    /**
     * 生成签名，30分钟后过期
     * @param userId
     * @return
     */
    public static String sign(String userId) {
        try {
            Date date = new Date(System.currentTimeMillis() + EXPIRE_TIME);
            Algorithm algorithm = Algorithm.HMAC256(SECRET);
            return JWT.create()
                    // 将 user id 保存到 token 里面
                    .withAudience(userId)
                    // 30分钟后token过期
                    .withExpiresAt(date)
                    // token 的密钥
                    .sign(algorithm);
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 根据token获取userId
     * @param token
     * @return
     */
    public static String getUserId(String token) {
        try {
            String userId = JWT.decode(token).getAudience().get(0);
            return userId;
        } catch (JWTDecodeException e) {
            return null;
        }
    }

    /**
     * 校验token
     * @param token
     * @return
     */
    public static boolean checkSign(String token) {
        try {
            Algorithm algorithm = Algorithm.HMAC256(SECRET);
            JWTVerifier verifier = JWT.require(algorithm)
                    // .withClaim("username", username)
                    .build();
            DecodedJWT jwt = verifier.verify(token);
            return true;
        } catch (JWTVerificationException exception) {
            throw new RuntimeException("token 无效，请重新获取");
        }
    }
}

5. WebConfig.java

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    /**
     * 添加jwt拦截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(jwtInterceptor())
                // 拦截所有请求，通过判断是否有 @JwtToken 注解 决定是否需要登录
                .addPathPatterns("/**");
    }

    /**
     * jwt拦截器
     * @return
     */
    @Bean
    public JwtInterceptor jwtInterceptor() {
        return new JwtInterceptor();
    }
}

6. GlobalExceptionHandler.java

import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;

import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.ValidationException;
import java.util.ArrayList;
import java.util.Set;

@ControllerAdvice
@Component
public class GlobalExceptionHandler {
    @ResponseBody
    @ExceptionHandler(Exception.class)
    public Result handleException(Exception e) {
        String msg = e.getMessage();
        if (msg == null || msg.equals("")) {
            msg = "服务器出错";
        }
        return  Result.fail(msg);
    }
}

注：Result参见上一篇Springboot配置validator参数校验

使用方法：
在需要进行token校验的接口添加@JwtToken即可

 	@JwtToken
    @GetMapping("/test")
    public void test() { 
    }

本文地址：https://blog.csdn.net/qq_24734285/article/details/109269394