Springboot通过请求头获取当前用户信息方法详细示范

ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = sra.getRequest();

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
</dependency>

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
</dependency>

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
</dependency>
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;
/**
 * redis工具类
 */
@Component
public class RedisUtil {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 指定缓存失效时间
     *
     * @param key  键
     * @param time 时间(秒)
     * @return true or false
     */
    public  Boolean expire(final String key, final long time) {
        stringRedisTemplate.afterPropertiesSet();
        try {
            if (time > 0) {
                stringRedisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (final Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 普通缓存获取
     *
     * @param key 键
     * @return 值
     */
    public  Object get(final String key) {
        stringRedisTemplate.afterPropertiesSet();
        return key == null ? null : stringRedisTemplate.opsForValue().get(key);
    }
    /**
     * 普通缓存放入
     *
     * @param key   键
     * @param value 值
     * @return true成功 false失败
     */
    public  Boolean set(final String key, final String value) {
        stringRedisTemplate.afterPropertiesSet();
        try {
            stringRedisTemplate.opsForValue().set(key, value);
            return true;
        } catch (final Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 普通缓存放入并设置时间
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒) time要大于0 如果time小于等于0 将设置无限期
     * @return true成功 false 失败
     */
    public  Boolean set(final String key, final String value, final long time) {
        stringRedisTemplate.afterPropertiesSet();
        try {
            if (time > 0) {
                stringRedisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (final Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 删除键
     * @param key 键
     * @return true or false
     */
    public  Boolean del(final String key) {
        stringRedisTemplate.afterPropertiesSet();
        try {
            stringRedisTemplate.opsForHash().delete(key);
            return true;
        } catch (final Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}

import java.util.UUID;
public class TokenUtil {
    public static String generateToken() {
        //生成唯一不重复的字符串
        return UUID.randomUUID().toString();
    }
}

import com.alibaba.fastjson.JSONObject;
import com.example.commons.utils.MyStringUtils;
import com.example.commons.utils.ObjectUtil;
import com.example.commons.utils.RedisUtil;
import com.example.commons.vo.UserVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
@Component
public class UserHelper {
    @Autowired
    private RedisUtil redisUtil;
    /**
     * 获取当前用户的信息
     * @return userVO
     */
    public UserVO getCurrentUser() {
        ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (sra == null) {
            return null;
        }
        HttpServletRequest request = sra.getRequest();
        return getCurrentUser(request);
    }
    /**
     * 通过请求获取当前用户信息
     * @param request 请求
     * @return userVO
     */
    public UserVO getCurrentUser(HttpServletRequest request) {
        String token = request.getHeader("Authorization");
        if (MyStringUtils.isBlank(token)) {
            return null;
        }
        return getCurrentUserByToken(token);
    }
    /**
     * 通过token获取当前用户信息
     * @param token token
     * @return userVO
     */
    public UserVO getCurrentUserByToken(String token) {
        String context = (String) redisUtil.get(token);
        if (MyStringUtils.isBlank(context)) {
            return null;
        }
        try {
            return JSONObject.parseObject(context, UserVO.class);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 获取当前用户的id
     * @return 用户id
     */
    public Long getCurrentUserId() {
        UserVO userVO = getCurrentUser();
        if (ObjectUtil.isNull(userVO)) {
            return null;
        }
        return userVO.getId();
    }
    /**
     * 获取当前请求
     * @return request
     */
    public HttpServletRequest getHttpServletRequest() {
        ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (sra == null) {
            return null;
        }
        return sra.getRequest();
    }
}

@PostMapping("/login")
public RestResponseEntity Login(@RequestParam("id") Long id) {
    // 此处简化操作，只要用户id存在即视为登录成功
    User user = userService.getUserById(id);
    if (ObjectUtil.isNull(user)) {
        return RestResponseEntity.fail("登录失败");
    }
    UserVO userVO = new UserVO();
    userVO.setId(user.getId());
    userVO.setName(user.getUName());
    // 将userVO序列化转成json字符串
    String userContext = JSON.toJSONString(userVO);
    // 随机生成一个token
    String token = TokenUtil.generateToken();
    // 将token与userContext存入redis
    redisUtil.set(token, userContext);
    return RestResponseEntity.success(token);  // 此处响应体为自定义
}

import com.example.commons.vo.UserVO;
import com.example.reader.Helper.UserHelper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserHelper userHelper;
    @GetMapping("/getUser")
    public UserVO getUser() {
        return userHelper.getCurrentUser();
    }
}

UserVO userVO =userHelper.getCurrentUser();