JSON Web Token 基于JSON对象为载体，安全的传输信息，用于完成授权认证。

JWT分为三部分

  • Header

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    {
      'typ': 'JWT',
      'alg': 'HS256'
    }

  • Payload(载荷，有效信息）

  • Signature（签名）

此处展示一个模板
导入jtw

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<!--jwt依赖 -->
      <dependency>
          <groupId>io.jsonwebtoken</groupId>
          <artifactId>jjwt</artifactId>
          <version>0.9.1</version>
      </dependency>
      <dependency>
          <groupId>javax.xml.bind</groupId>
          <artifactId>jaxb-api</artifactId>
          <version>2.4.0-b180830.0359</version>
      </dependency>
      <dependency>
          <groupId>com.sun.xml.bind</groupId>
          <artifactId>jaxb-impl</artifactId>
          <version>3.0.0-M4</version>
      </dependency>
      <dependency>
          <groupId>com.sun.xml.bind</groupId>
          <artifactId>jaxb-core</artifactId>
          <version>3.0.0-M4</version>
      </dependency>
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package com.zfxt.sjv.util;

import io.jsonwebtoken.*;

import java.util.Date;

/**
 * @author:zfx-t
 * @version:1.0
 */
public class JwtUtil {
    //设置超时时间
    private static long time = 1000 * 60 * 24;
    //设置密钥
    private static String signature = "zfx-t";

    public static String encrypt(){
        JwtBuilder jwtBuilder = Jwts.builder();
        String token = jwtBuilder
                //header
                .setHeaderParam("typ","JWT")
                .setHeaderParam("alg","HS256")
                //payload
                .claim("username","admin")
                .claim("password","admin")
                .setExpiration(new Date(System.currentTimeMillis()+time))
                //signature
                .signWith(SignatureAlgorithm.HS256,signature)
                .compact();
        return token;
    }
    public void decrypt(){
        String token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VybmFtZSI6ImFkbWluIiwicm9sZSI6ImFkbWluIiwic3ViIjoiSldULXRlc3QiLCJleHAiOjE2ODE4NzU3ODYsImp0aSI6IjkyNDY3N2EwLTBmNDEtNGEwMi04NWY1LTVmMGMxYTY5Nzg2MyJ9.BsHrHcWcHCoWtJVdAuybeAEG1FSUpx1aUDApnEQfAkA";
        JwtParser jwtParser = Jwts.parser();
        Jws<Claims> claimsJws = jwtParser.setSigningKey(signature).parseClaimsJws(token);
        Claims claims = claimsJws.getBody();
        System.out.println(claims.get("username"));
        //获取id
        System.out.println(claims.getId());
        //获取主题
        System.out.println(claims.getSubject());
        //获取超时日期
        System.out.println(claims.getExpiration());

    }
}