拼接进入房间entry地址参数加密（JAVA）

Example

JAVA示例

package cn;
import java.net.URLEncoder;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class MD5Util {
    /***
    * md5加密
    * @param md5
    * @return
    */
    public static String MD5(String md5)
    {
        try
        {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
            byte[] array = md.digest(md5.getBytes());
            StringBuilder sb = new StringBuilder();
            for (byte anArray : array) {
                sb.append(Integer.toHexString((anArray & 0xFF) | 0x100).subString(1, 3));
            }
            return sb.toString();
        }
        catch (java.security.NoSuchAlgorithmException e)
        {
            e.printStackTrace();
            return null;
        }
    }
    /**
    * 密码编码
    * @param content
    * @param key
    * @return
    */
    public static String encrypts(String content, String key)
    {
        if(key == null || key.length() != 16)
        {
            System.err.println("AES key 的长度必须是16位！");
            return null;
        }
        try
        {
            Cipher cipher = Cipher.getInstance("AES/ECB/NOPadding");
            int blockSize = cipher.getBlockSize();
            byte[] dataBytes = content.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");
            cipher.init(Cipher.ENCRYPT_MODE, keyspec);
            byte[] encrypted = cipher.doFinal(plaintext);
            if (encrypted == null){
                return null;
            }
            char[] hexArray = "0123456789abcdef".toCharArray();
            char[] hexChars = new char[encrypted.length * 2];
            for (int j = 0; j < encrypted.length; j++) {
                int v = encrypted[j] & 0xFF;
                hexChars[j * 2] = hexArray[v >>> 4];
                hexChars[j * 2 + 1] = hexArray[v & 0x0F];
            }
            return new String(hexChars);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }
    /**
    * 输入中文和特殊字符加密
    * @param str
    * @return
    */
    public static String encode(String str) {
        String strUTF8 = null;
        try {
            strUTF8 = URLEncoder.encode(str, "UTF-8");
            System.out.println(strUTF8);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return strUTF8;
    }
}