Java解析微信获取手机号信息的示例步骤

import javax.crypto.Cipher;  
import javax.crypto.spec.IvParameterSpec;  
import javax.crypto.spec.SecretKeySpec;  
import java.nio.charset.StandardCharsets;  
import java.util.Base64;  
  
public class WeChatPhoneNumberDecrypter {  
  
    private static final String ALGORITHM = "AES/CBC/PKCS5Padding";  
  
    public static String decryptPhoneNumber(String encryptedData, String sessionKey, String iv) throws Exception {  
        // Base64 解码  
        byte[] encryptedDataBytes = Base64.getDecoder().decode(encryptedData);  
        byte[] sessionKeyBytes = Base64.getDecoder().decode(sessionKey);  
        byte[] ivBytes = Base64.getDecoder().decode(iv);  
  
        // 设置AES密钥和初始化向量  
        SecretKeySpec secretKeySpec = new SecretKeySpec(sessionKeyBytes, "AES");  
        IvParameterSpec ivParameterSpec = new IvParameterSpec(ivBytes);  
  
        // 创建Cipher实例并初始化  
        Cipher cipher = Cipher.getInstance(ALGORITHM);  
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);  
  
        // 解密  
        byte[] decryptedBytes = cipher.doFinal(encryptedDataBytes);  
  
        // 将解密后的字节转换为字符串  
        return new String(decryptedBytes, StandardCharsets.UTF_8);  
    }  
  
    public static void main(String[] args) {  
        try {  
            // 这些值通常从微信小程序前端获取，并通过网络请求发送到后端  
            String encryptedData = "..."; // 加密的手机号数据，从微信小程序获取  
            String sessionKey = "..."; // 会话密钥，从微信小程序获取  
            String iv = "..."; // 初始化向量，从微信小程序获取  
  
            // 解密手机号  
            String decryptedPhoneNumber = decryptPhoneNumber(encryptedData, sessionKey, iv);  
            System.out.println("解密后的手机号: " + decryptedPhoneNumber);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}