初始化项目

backend/src/main/java/com/bycrm/util/JwtUtil.java

@@ -0,0 +1,128 @@
+package com.bycrm.util;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.security.Keys;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import javax.crypto.SecretKey;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * JWT 工具类
+ */
+@Component
+public class JwtUtil {
+
+    @Value("${jwt.secret}")
+    private String secret;
+
+    @Value("${jwt.expiration}")
+    private Long expiration;
+
+    /**
+     * 生成 Token
+     */
+    public String generateToken(Long userId, String username, Integer role, Long dealerId) {
+        Map<String, Object> claims = new HashMap<>();
+        claims.put("userId", userId);
+        claims.put("username", username);
+        claims.put("role", role);
+        claims.put("dealerId", dealerId);
+        return generateToken(claims);
+    }
+
+    /**
+     * 生成 Token
+     */
+    public String generateToken(Map<String, Object> claims) {
+        Date now = new Date();
+        Date expiryDate = new Date(now.getTime() + expiration);
+
+        return Jwts.builder()
+                .setClaims(claims)
+                .setIssuedAt(now)
+                .setExpiration(expiryDate)
+                .signWith(getSigningKey(), SignatureAlgorithm.HS512)
+                .compact();
+    }
+
+    /**
+     * 从 Token 中获取 Claims
+     */
+    public Claims getClaimsFromToken(String token) {
+        return Jwts.parserBuilder()
+                .setSigningKey(getSigningKey())
+                .build()
+                .parseClaimsJws(token)
+                .getBody();
+    }
+
+    /**
+     * 从 Token 中获取用户ID
+     */
+    public Long getUserIdFromToken(String token) {
+        Claims claims = getClaimsFromToken(token);
+        return claims.get("userId", Long.class);
+    }
+
+    /**
+     * 从 Token 中获取用户名
+     */
+    public String getUsernameFromToken(String token) {
+        Claims claims = getClaimsFromToken(token);
+        return claims.get("username", String.class);
+    }
+
+    /**
+     * 从 Token 中获取角色
+     */
+    public Integer getRoleFromToken(String token) {
+        Claims claims = getClaimsFromToken(token);
+        return claims.get("role", Integer.class);
+    }
+
+    /**
+     * 从 Token 中获取经销商ID
+     */
+    public Long getDealerIdFromToken(String token) {
+        Claims claims = getClaimsFromToken(token);
+        return claims.get("dealerId", Long.class);
+    }
+
+    /**
+     * 验证 Token 是否过期
+     */
+    public boolean isTokenExpired(String token) {
+        try {
+            Date expiration = getClaimsFromToken(token).getExpiration();
+            return expiration.before(new Date());
+        } catch (Exception e) {
+            return true;
+        }
+    }
+
+    /**
+     * 验证 Token
+     */
+    public boolean validateToken(String token) {
+        try {
+            return !isTokenExpired(token);
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
+    /**
+     * 获取签名密钥
+     */
+    private SecretKey getSigningKey() {
+        byte[] keyBytes = secret.getBytes(StandardCharsets.UTF_8);
+        return Keys.hmacShaKeyFor(keyBytes);
+    }
+}