使用telnet登陆smtp服务发邮件(带身份验证)和Base64加密算法源码（java版）
2007-10-24 09:58
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转载：使用telnet登陆smtp服务发邮件(带身份验证)。
昨天，公司的合作伙伴新增了一台 FC4 ,(Apache1 + php5 + mysql +exim)的服务器，要把一个PHP程序挂到新增的服务器上，程序在新增的服务器上不能发信，我是使用比较简单的方法 mail() 函数来发信的，配置了 php.ini 里面的 sendmail_path=/usr/sbin/exim -t -i 还是不能发信，请高人指点。无奈之下，打算使用 socket 登陆 smtp 的服务器来发信。经过一个晚上的研究，终于找出了 telnet 登陆带身份认证的SMTP服务器。具体过程如下：[root@newsclub east]# telnet smtp.163.com 25 //登陆 smtp.163.com 端口号为 25
Trying 202.108.44.205...
Connected to smtp.163.com (202.108.44.205).
Escape character is '^]'.
220 163.com Coremail SMTP(Anti Spam) System
HELO localhost // 与服务器打招呼，并告知客户端使用的机器名字，可以随便填写
250 OK
AUTH LOGIN //使用身份认证登陆指令
334 dXNlcm5hbWU6
cmVkc29zMw== //输入已经base64_encode()过的用户名.
334 UGFzc3dvcmQ6
MbM2MDQ3NQ== //输入已经base64_encode()过的密码
235 Authentication successful
MAIL FROM:<redsos3@163.com> //告诉服务器发信人的地址
250 Mail OK
RCPT TO:<yourframe@21cn.com> //告诉服务器收信人的地址
250 Mail OK
DATA //正面开始传输信件的内容，且最后要以只含有 . 的特殊行结束。
354 End data with <CR><LF>.<CR><LF>
To:yourframe@21cn.com
From:redsos3@163.com
Subject:test mail
From:redsos3@163.com
test body
． //结束传输信件
250 Mail OK queued as smtp14,F0CPBFsuzUOvoDwE.41582S2
QUIT //断开连接
221 Bye
Connection closed by foreign host.
状态码说明：
220 ： 服务就绪
250 ：请求邮件动作正确，完成（HELO,MAIL FROM,RCPT TO,QUIT 指令执行成功会返回此信息）
235 ：认证通过
221 ：正在处理
354 ：开始发送数据，结束以 ．（DATA指令执行成功会返回此信息）
500 ：语法错误，命令不能识别
550 ：命令不能执行，邮箱无效
552 ：中断处理：用户超出文件空间
转自：http://2design.spaces.live.com/blog/cns!BCAF80BA63B7B2A3!153.entry
Base64加密算法源码（java版）
public class Base64 ...{
private static final byte[] encodingTable = ...{
(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E',
(byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J',
(byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O',
(byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T',
(byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y',
(byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd',
(byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i',
(byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n',
(byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's',
(byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x',
(byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2',
(byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7',
(byte) '8', (byte) '9', (byte) '+', (byte) '/'
};
private static final byte[] decodingTable;
static ...{
decodingTable = new byte[128];
for (int i = 0; i < 128; i++) ...{
decodingTable[i] = (byte) -1;
}
for (int i = 'A'; i <= 'Z'; i++) ...{
decodingTable[i] = (byte) (i - 'A');
}
for (int i = 'a'; i <= 'z'; i++) ...{
decodingTable[i] = (byte) (i - 'a' + 26);
}
for (int i = '0'; i <= '9'; i++) ...{
decodingTable[i] = (byte) (i - '0' + 52);
}
decodingTable['+'] = 62;
decodingTable['/'] = 63;
}
public static byte[] encode(byte[] data) ...{
byte[] bytes;
int modulus = data.length % 3;
if (modulus == 0) ...{
bytes = new byte[(4 * data.length) / 3];
} else ...{
bytes = new byte[4 * ((data.length / 3) + 1)];
}
int dataLength = (data.length - modulus);
int a1;
int a2;
int a3;
for (int i = 0, j = 0; i < dataLength; i += 3, j += 4) ...{
a1 = data[i] & 0xff;
a2 = data[i + 1] & 0xff;
a3 = data[i + 2] & 0xff;
bytes[j] = encodingTable[(a1 >>> 2) & 0x3f];
bytes[j + 1] = encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f];
bytes[j + 2] = encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f];
bytes[j + 3] = encodingTable[a3 & 0x3f];
}
int b1;
int b2;
int b3;
int d1;
int d2;
switch (modulus) ...{
case 0: /**//* nothing left to do */
break;
case 1:
d1 = data[data.length - 1] & 0xff;
b1 = (d1 >>> 2) & 0x3f;
b2 = (d1 << 4) & 0x3f;
bytes[bytes.length - 4] = encodingTable[b1];
bytes[bytes.length - 3] = encodingTable[b2];
bytes[bytes.length - 2] = (byte) '=';
bytes[bytes.length - 1] = (byte) '=';
break;
case 2:
d1 = data[data.length - 2] & 0xff;
d2 = data[data.length - 1] & 0xff;
b1 = (d1 >>> 2) & 0x3f;
b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;
b3 = (d2 << 2) & 0x3f;
bytes[bytes.length - 4] = encodingTable[b1];
bytes[bytes.length - 3] = encodingTable[b2];
bytes[bytes.length - 2] = encodingTable[b3];
bytes[bytes.length - 1] = (byte) '=';
break;
}
return bytes;
}
public static byte[] decode(byte[] data) ...{
byte[] bytes;
byte b1;
byte b2;
byte b3;
byte b4;
data = discardNonBase64Bytes(data);
if (data[data.length - 2] == '=') ...{
bytes = new byte[(((data.length / 4) - 1) * 3) + 1];
} else if (data[data.length - 1] == '=') ...{
bytes = new byte[(((data.length / 4) - 1) * 3) + 2];
} else ...{
bytes = new byte[((data.length / 4) * 3)];
}
for (int i = 0, j = 0; i < (data.length - 4); i += 4, j += 3) ...{
b1 = decodingTable[data[i]];
b2 = decodingTable[data[i + 1]];
b3 = decodingTable[data[i + 2]];
b4 = decodingTable[data[i + 3]];
bytes[j] = (byte) ((b1 << 2) | (b2 >> 4));
bytes[j + 1] = (byte) ((b2 << 4) | (b3 >> 2));
bytes[j + 2] = (byte) ((b3 << 6) | b4);
}
if (data[data.length - 2] == '=') ...{
b1 = decodingTable[data[data.length - 4]];
b2 = decodingTable[data[data.length - 3]];
bytes[bytes.length - 1] = (byte) ((b1 << 2) | (b2 >> 4));
} else if (data[data.length - 1] == '=') ...{
b1 = decodingTable[data[data.length - 4]];
b2 = decodingTable[data[data.length - 3]];
b3 = decodingTable[data[data.length - 2]];
bytes[bytes.length - 2] = (byte) ((b1 << 2) | (b2 >> 4));
bytes[bytes.length - 1] = (byte) ((b2 << 4) | (b3 >> 2));
} else ...{
b1 = decodingTable[data[data.length - 4]];
b2 = decodingTable[data[data.length - 3]];
b3 = decodingTable[data[data.length - 2]];
b4 = decodingTable[data[data.length - 1]];
bytes[bytes.length - 3] = (byte) ((b1 << 2) | (b2 >> 4));
bytes[bytes.length - 2] = (byte) ((b2 << 4) | (b3 >> 2));
bytes[bytes.length - 1] = (byte) ((b3 << 6) | b4);
}
return bytes;
}
public static byte[] decode(String data) ...{
byte[] bytes;
byte b1;
byte b2;
byte b3;
byte b4;
data = discardNonBase64Chars(data);
if (data.charAt(data.length() - 2) == '=') ...{
bytes = new byte[(((data.length() / 4) - 1) * 3) + 1];
} else if (data.charAt(data.length() - 1) == '=') ...{
bytes = new byte[(((data.length() / 4) - 1) * 3) + 2];
} else ...{
bytes = new byte[((data.length() / 4) * 3)];
}
for (int i = 0, j = 0; i < (data.length() - 4); i += 4, j += 3) ...{
b1 = decodingTable[data.charAt(i)];
b2 = decodingTable[data.charAt(i + 1)];
b3 = decodingTable[data.charAt(i + 2)];
b4 = decodingTable[data.charAt(i + 3)];
bytes[j] = (byte) ((b1 << 2) | (b2 >> 4));
bytes[j + 1] = (byte) ((b2 << 4) | (b3 >> 2));
bytes[j + 2] = (byte) ((b3 << 6) | b4);
}
if (data.charAt(data.length() - 2) == '=') ...{
b1 = decodingTable[data.charAt(data.length() - 4)];
b2 = decodingTable[data.charAt(data.length() - 3)];
bytes[bytes.length - 1] = (byte) ((b1 << 2) | (b2 >> 4));
} else if (data.charAt(data.length() - 1) == '=') ...{
b1 = decodingTable[data.charAt(data.length() - 4)];
b2 = decodingTable[data.charAt(data.length() - 3)];
b3 = decodingTable[data.charAt(data.length() - 2)];
bytes[bytes.length - 2] = (byte) ((b1 << 2) | (b2 >> 4));
bytes[bytes.length - 1] = (byte) ((b2 << 4) | (b3 >> 2));
} else ...{
b1 = decodingTable[data.charAt(data.length() - 4)];
b2 = decodingTable[data.charAt(data.length() - 3)];
b3 = decodingTable[data.charAt(data.length() - 2)];
b4 = decodingTable[data.charAt(data.length() - 1)];
bytes[bytes.length - 3] = (byte) ((b1 << 2) | (b2 >> 4));
bytes[bytes.length - 2] = (byte) ((b2 << 4) | (b3 >> 2));
bytes[bytes.length - 1] = (byte) ((b3 << 6) | b4);
}
return bytes;
}
private static byte[] discardNonBase64Bytes(byte[] data) ...{
byte[] temp = new byte[data.length];
int bytesCopied = 0;
for (int i = 0; i < data.length; i++) ...{
if (isValidBase64Byte(data[i])) ...{
temp[bytesCopied++] = data[i];
}
}
byte[] newData = new byte[bytesCopied];
System.arraycopy(temp, 0, newData, 0, bytesCopied);
return newData;
}
private static String discardNonBase64Chars(String data) ...{
StringBuffer sb = new StringBuffer();
int length = data.length();
for (int i = 0; i < length; i++) ...{
if (isValidBase64Byte((byte) (data.charAt(i)))) ...{
sb.append(data.charAt(i));
}
}
return sb.toString();
}
private static boolean isValidBase64Byte(byte b) ...{
if (b == '=') ...{
return true;
} else if ((b < 0) || (b >= 128)) ...{
return false;
} else if (decodingTable[b] == -1) ...{
return false;
}
return true;
}
public static void main(String[] args) ...{
String data = "1";
byte[] result = Base64.encode(data.getBytes());
System.out.println(data);
System.out.println(new String(result));
System.out.println(new String(Base64.decode(new String(result))));
}
}
转自：http://blog.csdn.net/zyg158/archive/2007/06/26/1667531.aspx
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