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https://codeup.aliyun.com/67c68d4e484ca2f0a13ac3c1/ydc/jsowell-charger-web.git
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121 lines
3.4 KiB
Java
121 lines
3.4 KiB
Java
package com.jsowell.common.util;
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import lombok.extern.slf4j.Slf4j;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.nio.charset.StandardCharsets;
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import java.security.KeyFactory;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.Signature;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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import java.text.DecimalFormat;
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import java.util.Base64;
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/**
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* 汇付支付的工具类
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*/
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@Slf4j
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public class AdapayUtil {
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/**
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* 格式化数字 保留两位小数，不足补0
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* @param amount
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* @return
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*/
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public static String formatAmount(String amount) {
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return formatAmount(new BigDecimal(amount));
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}
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/**
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* 格式化数字 保留两位小数，不足补0
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* @param amount
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* @return
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*/
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public static String formatAmount(BigDecimal amount) {
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return formatAmount(amount, 2);
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}
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/**
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* 格式化数字 保留n位小数，不足补0
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* @param amount
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* @return
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*/
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public static String formatAmount(BigDecimal amount, int n) {
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//保留n位小数 没有四舍五入
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double d = amount.setScale(n, RoundingMode.DOWN).doubleValue();
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//不足则补0
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StringBuilder pattern = new StringBuilder("0");
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for (int i = 0; i < n; i++) {
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if (i == 0) {
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pattern.append(".");
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}
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pattern.append("0");
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}
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DecimalFormat decimalFormat = new DecimalFormat(pattern.toString());
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return decimalFormat.format(d);
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}
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public static void main(String[] args) {
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BigDecimal bigDecimal = new BigDecimal("1236.8369");
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System.out.println(formatAmount(bigDecimal, 0));
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System.out.println(formatAmount(bigDecimal, 2));
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System.out.println(formatAmount(bigDecimal, 4));
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}
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/**
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* RSA私钥签名：签名方式SHA256WithRSA
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* @param data 待签名字符串
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* @param privateKeyBase64 私钥（Base64编码）
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* @return 签名byte[]
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* @throws Exception
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*/
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public static String sign(String data, String privateKeyBase64) {
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// Base64 --> Key
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try {
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byte[] bytes = Base64.getDecoder().decode(privateKeyBase64);
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PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
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KeyFactory keyFactory;
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keyFactory = KeyFactory.getInstance("RSA");
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PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
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// Sign
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Signature signature = Signature.getInstance("SHA256WithRSA");
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signature.initSign(privateKey);
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signature.update(data.getBytes(StandardCharsets.UTF_8));
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return Base64.getEncoder().encodeToString(signature.sign());
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} catch (Exception e) {
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log.error("sign Exception", e);
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return null;
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}
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}
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/**
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* 使用汇付RSA公钥验签
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* @param data 待签名字符串
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* @param publicKeyBase64 公钥（Base64编码）
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* @return 验签结果
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* @throws Exception
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*/
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public static boolean verify(String data, String publicKeyBase64, String sign) {
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// Base64 --> Key
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try {
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byte[] bytes = Base64.getDecoder().decode(publicKeyBase64);
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
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KeyFactory keyFactory;
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keyFactory = KeyFactory.getInstance("RSA");
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PublicKey publicKey = keyFactory.generatePublic(keySpec);
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// verify
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Signature signature = Signature.getInstance("SHA256WithRSA");
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signature.initVerify(publicKey);
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signature.update(data.getBytes(StandardCharsets.UTF_8));
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return signature.verify(Base64.getDecoder().decode(sign));
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} catch (Exception e) {
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log.error("verify Exception", e);
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return false;
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}
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}
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}
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