Use JJWT to complete Token verification

I received an order from the superior last week, and I need to complete the background interface function provided to the APP. The first thing to solve is the token verification. I believe that everyone who can see this article knows what the token is, because in the previous projects, they are all themselves. Handwritten, leave it to me to complete, I will definitely use JJWT for convenience (lazy), just record it here

1. maven dependencies

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.0</version>
</dependency>

2. Create a TokenUtil class and provide methods for creating and obtaining token information

2.1 createToken is mainly to set various values

public String createToken(String strUserId, String strOrgId) {
    SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
    long nowMillis = System.currentTimeMillis();
    long ttlMillis = nowMillis + (3600L * 1000L * time);
    Date now = new Date(nowMillis);
    Date exp = new Date(ttlMillis);
    HashMap<String, Object> claims = new HashMap<String, Object>();
    claims.put("orgId", strOrgId);
    JwtBuilder jwtBuilder = Jwts.builder()
            .setClaims(claims)
            .setId(id)
            .setIssuedAt(now)
            .setExpiration(exp)
            .setSubject (strUserId)
            .signWith(signatureAlgorithm, generalKey());
    return jwtBuilder.compact();
}

Important note: setClaims, the custom private declaration, must be in front, otherwise it will be overwritten

2.2 getToken

public Claims getToken(String token) throws Exception{
    Claims claims = Jwts.parser()
            .setSigningKey(generalKey())
            .parseClaimsJws(token)
            .getBody();
    return claims;
}

2.3 Verify token

if(claims != null){
    String strUserId = claims.getSubject();
    request.setAttribute("userId", strUserId);
    String strOrgId = claims.get("orgId", String.class);
    request.setAttribute("orgId", strOrgId);
    return true;
}