从抢货接口读取货物包

src/main/java/com/rj/util/HxrGoodsSignUtil.java

@@ -0,0 +1,58 @@
+package com.rj.util;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
+
+/** hxrd 前端 {@code getSignHeader} 对应的 SHA256 签名。 */
+public final class HxrGoodsSignUtil {
+
+    private HxrGoodsSignUtil() {}
+
+    /**
+     * 按前端规则生成签名：参数键排序 → {@code k=v&...} → 拼接 appStr → SHA256 hex。
+     *
+     * @param params 请求参数 + {@code timestamp} + {@code noncestr}
+     * @param appStr 前端 configs.appStr
+     */
+    public static String computeSign(Map<String, Object> params, String appStr) {
+        TreeMap<String, Object> sorted = new TreeMap<>();
+        if (params != null) {
+            for (Map.Entry<String, Object> entry : params.entrySet()) {
+                Object value = entry.getValue();
+                if (value == null) {
+                    continue;
+                }
+                String text = String.valueOf(value);
+                if (text.isEmpty()) {
+                    continue;
+                }
+                sorted.put(entry.getKey(), value);
+            }
+        }
+        String payload = sorted.entrySet().stream()
+                .map(e -> e.getKey() + "=" + e.getValue())
+                .collect(Collectors.joining("&"));
+        if (appStr != null && !appStr.isEmpty()) {
+            payload += appStr;
+        }
+        return sha256Hex(payload);
+    }
+
+    private static String sha256Hex(String input) {
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            byte[] hash = digest.digest(input.getBytes(StandardCharsets.UTF_8));
+            StringBuilder sb = new StringBuilder(hash.length * 2);
+            for (byte b : hash) {
+                sb.append(String.format("%02x", b));
+            }
+            return sb.toString();
+        } catch (NoSuchAlgorithmException e) {
+            throw new IllegalStateException("SHA-256 not available", e);
+        }
+    }
+}