jwt工具类

    io.jsonwebtoken
    jjwt
    0.9.1

    com.alibaba
    fastjson
    1.2.57

 

import com.alibaba.fastjson.JSON;
import com.lemo.saas.constant.ExceptionEnum;
import com.lemo.saas.constant.JwtConstants;
import com.lemo.saas.exception.MyException;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * token工具类
 *
 * @author zhangbin 2019年05月22日
 * @version 1.0
 * @since 1.0 2019年05月22日
 */
@Component
public class JwtUtils {
    @Autowired
    private HttpServletRequest request;
    @Autowired
    private StringUtil stringUtil;
  //  @Autowired
  //  private StringRedisTemplate redisTemplate;

    /**
     * @return java.lang.String
     * @author zhangBin
     * @descriptions //TODO 获取toke
     * @date 2019/5/22 9:05
     **/
    public String getToken() {
        String token = request.getHeader(JwtConstants.AUTH_HEADER);
        if (StringUtils.isEmpty(token) || !token.startsWith("Bearer ")) {
            throw new MyException(ExceptionEnum.TOKEN_INVALID_ERROR);
        }
        token = token.substring(7);
        return token;
    }

    /**
     * @return java.lang.String
     * @author zhangBin
     * @descriptions //TODO 获取用户名
     * @date 2019/5/16 16:32
     **/
    public String getUserNameFromToken() {

        String subject = getClaimsFromToken(getToken()).getSubject();
        return subject;
    }

    /**
     * @return java.util.Map
     * @author zhangBin
     * @descriptions //TODO 将token对象信息转换成map对象
     * @date 2019/5/16 16:45
     **/
    public Map getUserInfoFromToken() {
        return JSON.parseObject(getClaimsFromToken(getToken()).getSubject(), Map.class);
    }

    /**
     * @param param 需要获取的参数
     * @return java.lang.String
     * @author zhangBin
     * @descriptions //TODO 获取用户对象的信息
     * @date 2019/5/16 16:52
     **/
    public String getParamsToken(String param) {
        Map userInfoFromToken = getUserInfoFromToken();
        return stringUtil.replaceBlank(userInfoFromToken.get(param) + "\n");
    }

    /**
     * @param token token参数
     * @return io.jsonwebtoken.Claims
     * @author zhangBin
     * @descriptions //TODO 解析token，获取jwt的playLoad部分
     * @date 2019/5/16 16:30
     **/
    public Claims getClaimsFromToken(String token) {
        Claims body;
        try {
            body = Jwts.parser()
                    .setSigningKey(JwtConstants.SECRET)
                    .parseClaimsJws(token)
                    .getBody();
        } catch (Exception e) {
            throw new MyException(ExceptionEnum.TOKEN_INVALID_ERROR);
        }
        return body;
    }

    /**
     * 
     *  验证token是否失效
     *  true:过期   false:没过期
     * 
     */
    public Boolean isTokenExpired() {
        try {
            final Date expiration = getExpirationDateFromToken();
            return expiration.before(new Date());
        } catch (ExpiredJwtException expiredJwtException) {
            return true;
        }
    }

    /**
     * 获取jwt失效时间
     */
    public Date getExpirationDateFromToken() {
        return getClaimsFromToken(getToken()).getExpiration();
    }

    /**
     * 生成token(通过用户名和签名时候用的随机数)
     */
    /*public static String generateToken(String userId) {
        Map claims = new HashMap<>();
        return doGenerateToken(claims, userId);
    }*/
    public String generateToken(String userInfoInToken) {
        Map claims = new HashMap<>();
        return doGenerateToken(claims, userInfoInToken);
    }

    /**
     * 生成token
     */
    private String doGenerateToken(Map claims, String subject) {
        final Date createdDate = new Date();
        final Date expirationDate = new Date(createdDate.getTime() + JwtConstants.EXPIRATION * 1000);

        return Jwts.builder()
                .setClaims(claims)
                .setSubject(subject)
                .setIssuedAt(createdDate)
                .setExpiration(expirationDate)
                .signWith(SignatureAlgorithm.HS512, JwtConstants.SECRET)
                .compact();
    }
    

    /**
     * 获取混淆MD5签名用的随机字符串
     */
    public String getRandomKey() {
        return stringUtil.getRandomString(6);
    }
}