java jwt HS256

Java中的JWT HS256是指使用HMAC SHA-256算法进行加密和解密的Java Web Token（JWT）实现方法。它使用一个密钥对令牌进行签名和验证，确保令牌的完整性和真实性。
您可以使用io.jsonwebtoken库来实现Java JWT HS256。首先，您需要在项目中引入该库，可以通过添加以下Maven依赖项来实现：

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

然后，您可以使用以下代码来创建和验证JWT令牌：

import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.security.Keys;

public class JwtUtil {
  public static final String SECRET_KEY = "your_secret_key";

  public static String generateToken(String subject) {
    byte[] keyBytes = SECRET_KEY.getBytes();
    Key signingKey = Keys.hmacShaKeyFor(keyBytes);
    
    String token = Jwts.builder()
        .setSubject(subject)
        .signWith(signingKey, SignatureAlgorithm.HS256)
        .compact();

    return token;
  }
  
  public static boolean validateToken(String token, String subject) {
    byte[] keyBytes = SECRET_KEY.getBytes();
    Key signingKey = Keys.hmacShaKeyFor(keyBytes);
    
    try {
      Jwts.parser()
          .setSigningKey(signingKey)
          .parseClaimsJws(token);
#### 引用[.reference_title]
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