42 lines
1.4 KiB
Java
42 lines
1.4 KiB
Java
import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.TreeMap;
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/** 空值不参与，字典序，MD5 小写 */
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public final class SignUtil {
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private SignUtil() {}
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public static String buildSign(Map<String, Object> params, String secretKey) throws Exception {
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TreeMap<String, Object> sorted = new TreeMap<>();
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for (Map.Entry<String, Object> e : params.entrySet()) {
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if ("Sign".equals(e.getKey())) {
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continue;
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}
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sorted.put(e.getKey(), e.getValue());
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}
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List<String> parts = new ArrayList<>();
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for (Map.Entry<String, Object> e : sorted.entrySet()) {
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Object v = e.getValue();
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if (v == null) {
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continue;
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}
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String s = String.valueOf(v);
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if (s.isEmpty()) {
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continue;
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}
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parts.add(e.getKey() + "=" + s);
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}
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String raw = String.join("&", parts) + "&SecretKey=" + secretKey;
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MessageDigest md = MessageDigest.getInstance("MD5");
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byte[] dig = md.digest(raw.getBytes(StandardCharsets.UTF_8));
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StringBuilder sb = new StringBuilder();
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for (byte b : dig) {
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sb.append(String.format("%02x", b));
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}
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return sb.toString();
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}
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}
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