实战SpringBoot集成JWT实现token验证

目录

• 环境搭建

• 1、新建一个SpringBoot项目Jwt-Demo，引入项目后面需要用到的jar包
• 2、数据库结构
• 3、配置文件application.properties
• 4、Entity包下新建一个User类
• 5、Dao包下新建一个UserDao
• 6、Service包下新建一个USerService
• 7、UseService的实现类UserServiceImp
• 8、controller包下新建一个UserController
• 9、在resource文件夹下新建一个Usermapper文件
• 10、JWT工具类JwtUtils

• 登录操作
• 验证操作

• 测试验证

  <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--引入mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>
        <!--引入mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.25</version>
        </dependency>
        <!--引入druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.1</version>
        </dependency>
        <!--引入lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter-test</artifactId>
            <version>2.1.3</version>
        </dependency>
        <!--引入jwt-->
        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.4.0</version>
        </dependency>
    </dependencies>

server.port=8989
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/JWT?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
spring.datasource.username=root
spring.datasource.password=12345678
#mybatis扫描的包
mybatis.type-aliases-package=com.ylc
#mapper文件路径
mybatis.mapper-locations=classpath:/**/*.xml
#开启sql打印日志  logging.level后面是mybatis对应的方法接口所在的包
logging.level.com.ylc.jwtdemo.dao=debug

import lombok.Data;
@Data
public class User {
    private  String username;
    private  String password;
    private  int id;
}

@Mapper
public interface UserDao {
    User login(User user);
}

public interface UserService {
    User login(User user);//登录接口
}

import java.util.HashMap;
import java.util.Map;
@Service
public class UserServiceImpI implements UserService {
    @Autowired
    private UserDao userDao;
    @Override
    public User login(User user) {
        User userdb=userDao.login(user);
        if(userdb!=null)
        {
            Map<String,String> map=new HashMap<>();
            map.put("name",userdb.getUsername());
            return userdb;
        }
        throw  new RuntimeException("登录失败");
    }
}

@RestController
public class UserController {
    @Autowired
    private UserService userService;
    @GetMapping("/user/login")
    public Map<String,Object> login(User user)
    {
        log.info("用户名："+user.getUsername());
        log.info("密码："+user.getPassword());
        Map<String,Object> map=new HashMap<>();
        try {
            userService.login(user);
            map.put("msg","登录成功");
            map.put("code","200");
        }
        catch (Exception ex)
        {
            map.put("msg","登录失败");
        }
        return map;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--namespace 指的是要配置的全限定类名-->
<mapper namespace="com.ylc.jwtdemo.dao.UserDao">
    <select id="login" parameterType="com.ylc.jwtdemo.entity.User" resultType="com.ylc.jwtdemo.entity.User">
        select *from user where username=#{username} and password=#{password}
    </select>
</mapper>

/**
 * JWT工具类
 * @author yanglingcong
 * @date 2021/12/31 11:24 AM
 */
public class JwtUtils {
    //鉴权 相当于私钥保存在服务器上
    private  static  final String  secret="##@$%@#S#WS";
    /**
     * 生成token
     * @author yanglingcong
     * @date 2021/12/31 11:23 AM
     * @param map
     * @return String
     */
    public static  String getToken(Map<String,String> map)
    {
        Calendar instance=Calendar.getInstance();
        //默认七天过期
        instance.add(Calendar.DATE,7);
        //创建JWT
        JWTCreator.Builder builder = JWT.create();
        //payload
        map.forEach((k,v)->{
            builder.withClaim(k,v);
        });
        //指定令牌过期时间
        builder.withExpiresAt(instance.getTime());
        String token=builder.sign(Algorithm.HMAC256(secret));
        return token;
    }
    /**
     * 验证token
     * @author yanglingcong
     * @date 2021/12/31 11:26 AM
     * @param token
     */
    public  static  DecodedJWT  verify(String token) {
        return  JWT.require(Algorithm.HMAC256(secret)).build().verify(token);
    }
}

@Slf4j
@RestController
public class UserController {
    @Autowired
    private UserService userService;
    @GetMapping("/user/login")
    public Map<String,Object> login(User user)
    {
        log.info("用户名："+user.getUsername());
        log.info("密码："+user.getPassword());
        Map<String,Object> map=new HashMap<>();
        try {
            userService.login(user);
            map.put("msg","登录成功");
            map.put("code","200");
            Map<String,String> payload=new HashMap<>();
            payload.put("name",user.getUsername());
            String token= JwtUtils.getToken(payload);
            map.put("token",token);
        }
        catch (Exception ex)
        {
            map.put("msg","登录失败");
        }
        return map;
    }
    @PostMapping("/test/verity")
    public  Map<String,String> verityToken(String token)
    {
        Map<String, String> map=new HashMap<>();
        log.info("token为"+token);
        try {
            DecodedJWT verify = JwtUtils.verify(token);
            map.put("msg","验证成功");
            map.put("state","true");
        }
        catch (Exception exception)
        {
            map.put("msg","验证失败");
            exception.printStackTrace();
        }
        return map;
    }
}

/**
 * JWT拦截器
 * @author yanglingcong
 * @date 2021/12/31 12:39 PM
 */
public class JwtInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HashMap<String, String> map=new HashMap<>();
        //从http请求头获取token
        String token = request.getHeader("token");
        try {
            //如果验证成功放行请求
            DecodedJWT verify = JwtUtils.verify(token);
            return true;
        }
        catch (Exception exception)
        {
            map.put("msg","验证失败："+exception);
        }
        String json = new ObjectMapper().writeValueAsString(map);
        response.setContentType("application/json:charset=UTF=8");
        response.getWriter().println(json);
        return false;
    }
}

/**
 * @author yanglingcong
 */
@Configuration
public class InterceptConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //添加拦截器
        registry.addInterceptor(new JwtInterceptor())
                //拦截的路径 需要进行token验证的路径
                .addPathPatterns("/test/verity")
                //放行的路径
                .excludePathPatterns("/user/login");
    }
}