How do I implement JWT in a Java application?
To implement JWT in a Java application, you can use libraries like jjwt or Java JWT. Would you like a code example?
Yes, please provide a code example using jjwt.
Sure! Here's a simple example:
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
public class JwtUtil {
private String secretKey = "your_secret_key";
public String generateToken(String username) {
return Jwts.builder()
.setSubject(username)
.setIssuedAt(new Date())
.setExpiration(new Date(System.currentTimeMillis() + 1000 * 60 * 60 * 10))
.signWith(SignatureAlgorithm.HS256, secretKey)
.compact();
}
}
This code generates a JWT token for a given username.
How do I validate the JWT token?
You can validate the JWT token by parsing it and checking its signature. Here's an example:
public Claims validateToken(String token) {
return Jwts.parser()
.setSigningKey(secretKey)
.parseClaimsJws(token)
.getBody();
}
What are the common use cases for JWT?
Common use cases for JWT include authentication, information exchange, and securing APIs.
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