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Spring Boot整合JWT的实现步骤

2021-11-08 12:29定格&不褪 Java教程

本文主要介绍了Spring Boot整合JWT,文中通过示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

springboot整合jwt步骤:

1、登录时,验证账号和密码成功后,生成jwt,返回给前端;
2、前端接收后保存,再做其他操作,比如增删改查时,同时将jwt传给后端进行验证,如果jwt当做参数一起传给后端,那么每个操作都会有jwt,为了方便,把jwt放到请求头中,通过拦截器来验证。

代码

代码结构图如下,除了常规的controller、entity、mapper和service层,还有两个拦截器和注册拦截器,图中用红字进行注释(这篇文章稍微有点长,因为我把代码都放上来了,结合下边的思路和结构图就能理解个大概)。

思路:有请求过来,通过拦截器进行拦截,但放行登录请求,如果登录成功,生成JWT令牌,返回给前端,当前端再有其他请求过来时,拦截器会拦截并解析token,如果通过就允许业务操作,否则就返回相应提示信息。

Spring Boot整合JWT的实现步骤

1、创建jwt数据库,然后创建user表

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4;

插入数据

INSERT INTO `user` VALUES (1, "zhangsan", "123");
INSERT INTO `user` VALUES (2, "lisi", "123");

2、创建Spring Boot项目,在pom文件中,添加jwt等一些依赖和properties:

        <!--jwt-->
        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.4</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.4</version>
        </dependency>
        <!--我的mysql是5.6,所以这里是5.1版本-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.3.8</version>
        </dependency>

编写application.properties

server.port=8899
spring.application.name=jwt

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/jwt?useSSL=true&characterEncoding=utf-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root

mybatis.type-aliases-package=com.jwt.entity
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

#打印sql
logging.level.com.jwt.mapper=debug

3、编写代码

3.1、编写entity包下的User

public class User {
    private String id;
    private String username;
    private String password;
    //省略了get和set方法
}

3.2、编写util包下的JWTUtils

public class JWTUtils {

    private static final String SING = "lu123456";

    /**
     * 生成token
     */
    public static String getToken(Map<String,String> map){
        Calendar instance = Calendar.getInstance();
        //默认7天过期
        instance.add(Calendar.DATE,7);
        //创建jwt builder
        JWTCreator.Builder builder = JWT.create();

        map.forEach((k,v)->{
            builder.withClaim(k,v);
        });

        String token = builder.withExpiresAt(instance.getTime())
                .sign(Algorithm.HMAC256(SING));
        return token;
    }

    /**
     * 验证token合法性
     */
    public static DecodedJWT verify(String token){
        return JWT.require(Algorithm.HMAC256(SING)).build().verify(token);
    }
}

3.3、编写controller层下UserController

@RestController
@Slf4j
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 {
            User userDB = userService.login(user);
            Map<String,String> payload = new HashMap<>();
            payload.put("id",userDB.getId());
            payload.put("username",userDB.getUsername());
            //生成JWT令牌
            String token = JWTUtils.getToken(payload);
            map.put("state",true);
            map.put("token",token);
            map.put("msg","认证成功");
        }catch (Exception e){
            map.put("state",false);
            map.put("msg",e.getMessage());
        }
        return map;
    }

    @PostMapping("/user/test")
    public Map<String,Object> test(String token){
        Map<String, Object> map = new HashMap<>();
        map.put("state",true);
        map.put("msg","请求成功");
        return map;
    }
}

3.4、编写service层下UserService类和UserServiceImpl

public interface UserService {
    User login (User user);
}

实现类:

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    @Transactional(propagation = Propagation.SUPPORTS)
    public User login(User user) {
        //查询数据库
        User userDB = userMapper.login(user);
        if (userDB != null){
            return userDB;
        }
        throw new RuntimeException("登录失败");
    }
}

3.5、编写mapper层的UserMapper

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

3.6、编写与UserMapper 对应的UserMapper.xml

<?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">
<mapper namespace="com.jwt.mapper.UserMapper">

    <select id="login" parameterType="com.jwt.entity.User" resultType="com.jwt.entity.User">
        SELECT * FROM user WHERE username = #{username} AND password = #{password}
    </select>

</mapper>

3.7、配置拦截器,这样得到jwt后,再次请求时把jwt放到请求头中,就可以不用当参数传递。
编写JWTInterceptor类:

/**
 * 配置拦截器
 */
public class JWTInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Map<String, Object> map = new HashMap<>();

        //获取请求头中的令牌
        String token = request.getHeader("token");

        try {
            //验证令牌
            DecodedJWT verify = JWTUtils.verify(token);
            return true;
        } catch (SignatureVerificationException e){
            e.printStackTrace();
            map.put("msg","无效签名");
        } catch (TokenExpiredException e){
            e.printStackTrace();
            map.put("msg","token过期");
        } catch (AlgorithmMismatchException e){
            e.printStackTrace();
            map.put("msg","token算法不一致");
        } catch (Exception e){
            e.printStackTrace();
            map.put("msg","token无效");
        }
        map.put("state","flase");

        //将map转为json
        String json = new ObjectMapper().writeValueAsString(map);
        response.setContentType("application/json;charset=UTF-8");
        response.getWriter().println(json);
        return false;
    }
}

编写InterceptorConfig类:

/**
 * 注册拦截器
 */
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new JWTInterceptor())
                //拦截
                .addPathPatterns("/user/test")
                //放行
                .excludePathPatterns("/user/login");
    }
}

4、测试

运行程序后,使用postman进行测试,登录如下图
请求方式:get
url:http://localhost:8899/user/login?username=zhangsan&password=123
然后点击send,就会看到返回成功和token

Spring Boot整合JWT的实现步骤

请求测试
请求方式:post
url:http://localhost:8899/user/test
点击header,在请求头中添加token,然后点击send

Spring Boot整合JWT的实现步骤

到此这篇关于Spring Boot整合JWT的文章就介绍到这了,更多相关Spring Boot整合JWT内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家!

原文链接:https://blog.csdn.net/qq_42524288/article/details/119391816

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