2.2. 创建 JwtClaimsBuilder 并设置声明

import java.util.Collections;
import jakarta.json.Json;
import jakarta.json.JsonObject;
import io.smallrye.jwt.build.Jwt;
import io.smallrye.jwt.build.JwtClaimsBuilder;
import org.eclipse.microprofile.jwt.JsonWebToken;
...
// Create an empty builder and add some claims
JwtClaimsBuilder builder1 = Jwt.claims();
builder1.claim("customClaim", "custom-value").issuer("https://issuer.org");
// Alternatively, start with claims directly:
// JwtClaimsBuilder builder1 = Jwt.upn("Alice");

// Create a builder from an existing claims file
JwtClaimsBuilder builder2 = Jwt.claims("/tokenClaims.json");

// Create a builder from a map of claims
JwtClaimsBuilder builder3 = Jwt.claims(Collections.singletonMap("customClaim", "custom-value"));

// Create a builder from a JsonObject
JsonObject userName = Json.createObjectBuilder().add("username", "Alice").build();
JsonObject userAddress = Json.createObjectBuilder().add("city", "someCity").add("street", "someStreet").build();
JsonObject json = Json.createObjectBuilder(userName).add("address", userAddress).build();
JwtClaimsBuilder builder4 = Jwt.claims(json);

// Create a builder from a JsonWebToken
@Inject JsonWebToken token;
JwtClaimsBuilder builder5 = Jwt.claims(token);