JWT颁发与解密

首先需要引入相关的依赖包

 <dependency>
	 <groupId>io.jsonwebtoken</groupId>
     <artifactId>jjwt</artifactId>
     <version>0.9.1</version>
 </dependency>

直接写个简单的DEMO吧,如下：

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Date;

public class Demo {

	//颁发令牌使用的密钥
	private static  String  SIGNING_KEY = "12132433454";


	/**
	 * 颁发令牌
	 * @return
	 */
	public static String createToken(){
		SecretKey key = new SecretKeySpec(SIGNING_KEY.getBytes(),"AES");
		JwtBuilder builder= Jwts.builder()
			.setIssuedAt(new Date())//设置签发时间
			.setId("1")//
			.setSubject("测试")
			//.setExpiration(null) //过期时间
			.signWith(SignatureAlgorithm.HS256,key);
		return builder.compact();
	}


	/**
	 * 通过token获取信息
	 * @param token
	 */
	public static void checkToken(String token){
		try{
			SecretKey key = new SecretKeySpec(SIGNING_KEY.getBytes(),"AES");

			Claims claims = Jwts.parser().setSigningKey(key).parseClaimsJws(token).getBody();

			System.out.println("id: " + claims.getId());
			System.out.println("subject: " + claims.getSubject());
		}catch (Exception e){
			System.out.println("解密异常 : " + e.getMessage());
		}
	}

	/**
	 * 测试
	 * @param args
	 * @throws Exception
	 */
	public static void main(String[] args) throws Exception{
		String token = createToken();//颁发令牌
		System.out.println("令牌: " + token);
		checkToken(token);//解密令牌
	}

}