Java实现token的生成与验证-登录功能

二、基于JWT的token认证实现
JWT：JSON Web Token，其实token就是一段字符串，由三部分组成：Header，Payload，Signature

1、引入依赖

<dependency>
      <groupId>com.auth0</groupId>
      <artifactId>java-jwt</artifactId>
      <version>3.8.2</version>
    </dependency>

　　

2、设置密钥和生存时间

//设置过期时间
    private static final long EXPIRE_DATE=30*60*100000;
    //token秘钥
    private static final String TOKEN_SECRET = "ZCEQIUBFKSJBFJH2020BQWE";

　　

3、实现签名方法

public static String token (String username,String password){

        String token = "";
        try {
            //过期时间
            Date date = new Date(System.currentTimeMillis()+EXPIRE_DATE);
            //秘钥及加密算法
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            //设置头部信息
            Map<String,Object> header = new HashMap<>();
            header.put("typ","JWT");
            header.put("alg","HS256");
            //携带username，password信息，生成签名
            token = JWT.create()
                    .withHeader(header)
                    .withClaim("username",username)
                    .withClaim("password",password).withExpiresAt(date)
                    .sign(algorithm);
        }catch (Exception e){
            e.printStackTrace();
            return  null;
        }
        return token;
    }

　　

4、验证token

public static boolean verify(String token){
        /**
         * @desc   验证token，通过返回true
         * @create 2019/1/18/018 9:39
         * @params [token]需要校验的串
         **/
        try {
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            JWTVerifier verifier = JWT.require(algorithm).build();
            DecodedJWT jwt = verifier.verify(token);
            return true;
        }catch (Exception e){
            e.printStackTrace();
            return  false;
        }
    }

　　

5、测试

1）、直接用生成的token去验证，成功

public static void main(String[] args) {
       String username ="zhangsan";
        String password = "123";
        String token = token(username,password);
        System.out.println(token);
        boolean b = verify(token);
        System.out.println(b);
    }

　　

三、完整的Token工具类代码

package xxx.utils; //你的包

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

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
 * @desc   使用token验证用户是否登录
 * @author zm
 **/
public class TokenUtils {
    //设置过期时间
    private static final long EXPIRE_DATE=30*60*100000;
    //token秘钥
    private static final String TOKEN_SECRET = "ZCfasfhuaUUHufguGuwu2020BQWE";

    public static String token (String username,String password){

        String token = "";
        try {
            //过期时间
            Date date = new Date(System.currentTimeMillis()+EXPIRE_DATE);
            //秘钥及加密算法
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            //设置头部信息
            Map<String,Object> header = new HashMap<>();
            header.put("typ","JWT");
            header.put("alg","HS256");
            //携带username，password信息，生成签名
            token = JWT.create()
                    .withHeader(header)
                    .withClaim("username",username)
                    .withClaim("password",password).withExpiresAt(date)
                    .sign(algorithm);
        }catch (Exception e){
            e.printStackTrace();
            return  null;
        }
        return token;
    }

    public static boolean verify(String token){
        /**
         * @desc   验证token，通过返回true
         * @params [token]需要校验的串
         **/
        try {
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            JWTVerifier verifier = JWT.require(algorithm).build();
            DecodedJWT jwt = verifier.verify(token);
            return true;
        }catch (Exception e){
            e.printStackTrace();
            return  false;
        }
    }
    public static void main(String[] args) {
       String username ="zhangsan";
        String password = "123";
        String token = token(username,password);
        System.out.println(token);
        boolean b = verify("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJwYXNzd22yZCI6IjEyMyIsImV4cCI6MTU3ODE5NzQxMywidXNlcm5hbWUiOiJ6aGFuZ3NhbiJ9.IyTZT0tISQQZhGhsNuaqHGV8LD7idjUYjn3MGbulmJg");
        System.out.println(b);
    }
}