package apistore;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.Console;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Arrays;
import java.util.Collection;
import java.util.Random;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;


//用户请使用UTF-8作为源码文件的保存格式，避免出现乱码问题
public class AES128_APIStore {
	/**
	 * 远程post
	 * @param strUrl
	 * @param param
	 * @return
	 */
	public static String requestPost(String strUrl, String param) {
		String returnStr = null; // 返回结果定义
		URL url = null;
		HttpURLConnection httpURLConnection = null;

		try {
			url = new URL(strUrl);
			httpURLConnection = (HttpURLConnection) url.openConnection();
			httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
			httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
			httpURLConnection.setDoOutput(true);
			httpURLConnection.setDoInput(true);
			httpURLConnection.setRequestMethod("POST"); // post方式
			httpURLConnection.connect();
			//System.out.println("ResponseCode:" + httpURLConnection.getResponseCode());
			//POST方法时使用
			byte[] byteParam = param.getBytes("UTF-8");
			DataOutputStream out = new DataOutputStream(httpURLConnection.getOutputStream());
			out.write(byteParam);
			out.flush();
			out.close();
			BufferedReader reader = new BufferedReader(
					new InputStreamReader(httpURLConnection.getInputStream(), "utf-8"));
			StringBuffer buffer = new StringBuffer();
			String line = "";
			while ((line = reader.readLine()) != null) {
				buffer.append(line);
			}

			reader.close();
			returnStr = buffer.toString();
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		} finally {
			if (httpURLConnection != null) {
				httpURLConnection.disconnect();
			}
		}
		return returnStr;
	}

	/**
	 * 加密字符串
	 * @param key
	 * @param data
	 * @return
	 */
	public static String encrypt(String key, String data)  {
        try {
            String iv = "0000000000000000";
            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            int blockSize = cipher.getBlockSize();
            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }
            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);
            return new sun.misc.BASE64Encoder().encode(encrypted);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

	/**
	 * 解密字符串
	 * @param key
	 * @param data
	 * @return
	 */
    public static String decrypt(String key, String data)  {
        try
        {
            String iv = "0000000000000000";
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(data);
            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString;
        }
        catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * return
     * @param args
     */
	public static void main(String[] args) {
		//接口地址
		//使用本接口,需要在安全设置页面,设置接入模式为aes128

		String url="https://v.1dq.com/api/c43";
		//您的appid
		String appid = "xxxx";
		//您的APPKEY / 32位
		String appkey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
		//需要传递的数据
		String params  = "{\"appid\":\""+appid+"\",\"bankcard\" : \"123456789\",\"apiversion\" : \"2.0.5\"}";

		//加密数据
		String sign = encrypt(appkey,params);
		//远程的请求;
		String  requestData = "appid="+appid+"&sign="+URLEncoder.encode(sign);
		//执行远程请求
		String returnStr = requestPost(url, requestData);
		System.out.println("sign:"+sign);
		System.out.println("传递的参数:"+requestData);
		System.out.println("远程服务器返回:"+returnStr);
		System.out.println("远程服务器返回:"+decrypt(appkey,returnStr));

	}

}