更新JwtUtils.java

JwtUtils.java

+
+package com.changgou.system.util;
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.JwtBuilder;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+import java.util.Base64;
+import java.util.Date;
+/**
+ * JWT工具类
+ */
+public class JwtUtil {
+
+    //有效期为
+    public static final Long JWT_TTL = 3600000L;// 60 * 60 *1000  一个小时
+    //设置秘钥明文
+    public static final String JWT_KEY = "itcast";
+
+    /**
+     * 创建token
+     * @param id
+     * @param subject
+     * @param ttlMillis
+     * @return
+     */
+    public static String createJWT(String id, String subject, Long ttlMillis) {
+
+        SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
+        long nowMillis = System.currentTimeMillis();
+        Date now = new Date(nowMillis);
+        if(ttlMillis==null){
+            ttlMillis=JwtUtil.JWT_TTL;
+        }
+        long expMillis = nowMillis + ttlMillis;
+        Date expDate = new Date(expMillis);
+        SecretKey secretKey = generalKey();
+
+        JwtBuilder builder = Jwts.builder()
+                .setId(id)              //唯一的ID
+                .setSubject(subject)   // 主题  可以是JSON数据
+                .setIssuer("admin")     // 签发者
+                .setIssuedAt(now)      // 签发时间
+                .signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥
+                .setExpiration(expDate);// 设置过期时间
+        return builder.compact();
+    }
+
+    /**
+     * 生成加密后的秘钥 secretKey
+     * @return
+     */
+    public static SecretKey generalKey() {
+        byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
+        SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
+        return key;
+    }
+    
+    /**
+     * 解析
+     *
+     * @param jwt
+     * @return
+     * @throws Exception
+     */
+    public static Claims parseJWT(String jwt) throws Exception {
+        SecretKey secretKey = generalKey();
+        return Jwts.parser()
+                .setSigningKey(secretKey)
+                .parseClaimsJws(jwt)
+                .getBody();
+    }
+}
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