这是我生成签名的代码，实在找不出问题出在哪里了 {"code":"SIGN_ERROR","detail":{"field":"signature","location":"authorization","sign_information":{"method":"POST","truncated_sign_message":"POST\n/v3/ecommerce/applyments/\n1709573143\nL733TZZTIS\n{}\n","sign_message_length":56,"url":"/v3/ecommerce/applyments/"},"detail":{"issue":"sign not match"}},"message":"错误的签名，验签失败"} import cn.hutool.core.util.RandomUtil; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.security.KeyFactory; import java.security.NoSuchAlgorithmException; import java.security.PrivateKey; import java.security.Signature; import java.security.spec.InvalidKeySpecException; import java.security.spec.PKCS8EncodedKeySpec; import java.util.Base64; public class WxAuthorizationUtil { /** * 得到签名信息 * @param method * @param url * @param body * @return * @throws Exception */ public static String getAuthorization(String method, String url, String body) throws Exception { String nonceStr = RandomUtil.randomStringUpper(10);; long timestamp = System.currentTimeMillis() / 1000; String message = buildMessage(method, url, timestamp, nonceStr, body); String signature = sign(message.getBytes("utf-8")); String MCHID_JDKJ = ""; String MCHSERIALNO_JDKJ = ""; String httpAuthorization = "mchid=\"" + MCHID_JDKJ + "\"," + "nonce_str=\"" + nonceStr + "\"," + "signature=\"" + signature + "\"," + "timestamp=\"" + timestamp + "\"," + "serial_no=\"" + MCHSERIALNO_JDKJ + "\""; httpAuthorization = "WECHATPAY2-SHA256-RSA2048 " + httpAuthorization; return httpAuthorization; } /** * 获取签名值 * @param message * @return * @throws Exception */ public static String sign(byte[] message) throws Exception { Signature sign = Signature.getInstance("SHA256withRSA"); PrivateKey merchantPrivateKey = getPrivateKey(""); sign.initSign(merchantPrivateKey); sign.update(message); return Base64.getEncoder().encodeToString(sign.sign()); } /** * 获取私钥。 * @param filename 私钥文件路径 (required) * @return 私钥对象 */ public static PrivateKey getPrivateKey(String filename) throws IOException { String content = new String(Files.readAllBytes(Paths.get(filename)), "utf-8"); try { String privateKey = content.replace("-----BEGIN PRIVATE KEY-----", "") .replace("-----END PRIVATE KEY-----", "") .replaceAll("\\s+", ""); KeyFactory kf = KeyFactory.getInstance("RSA"); return kf.generatePrivate( new PKCS8EncodedKeySpec(Base64.getDecoder().decode(privateKey))); } catch (NoSuchAlgorithmException e) { throw new RuntimeException("当前Java环境不支持RSA", e); } catch (InvalidKeySpecException e) { throw new RuntimeException("无效的密钥格式"); } } /** * 构造签名串 * 签名串一共有五行，每一行为一个参数。行尾以 \n（换行符，ASCII编码值为0x0A）结束，包括最后一行。如果参数本身以\n结束，也需要附加一个\n * HTTP请求方法\n * URL\n * 请求时间戳\n * 请求随机串\n * 请求报文主体\n * @param method * @param url * @param timestamp * @param nonceStr * @param body * @return * @throws Exception */ public static String buildMessage(String method, String url, long timestamp, String nonceStr, String body) { return method + "\n" + url + "\n" + timestamp + "\n" + nonceStr + "\n" + body + "\n"; } }