第一次冲刺07

希望能在注册时加更多安全验证，比如邮箱的真实性，数据库密码的加密，但是搜了一下感觉不好改，所以先学习一下。

import java.io.IOException;

import org.apache.commons.net.smtp.SMTPClient;
import org.apache.commons.net.smtp.SMTPReply;
import org.apache.log4j.Logger;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.Record;
import org.xbill.DNS.Type;

/**
*
* 校验邮箱：1、格式是否正确 2、是否真实有效的邮箱地址
* 步骤：
* 1、从dns缓存服务器上查询邮箱域名对应的SMTP服务器地址
* 2、尝试建立Socket连接
* 3、尝试发送一条消息给SMTP服务器
* 4、设置邮件发送者
* 5、设置邮件接收者
* 6、检查响应码是否为250(为250则说明这个邮箱地址是真实有效的)
* @author Michael Ran
*
*/
public class CheckEmailValidityUtil {
private static final Logger logger = Logger
.getLogger(CheckEmailValidityUtil.class);
/**
* @param email 待校验的邮箱地址
* @return
*/
public static boolean isEmailValid(String email) {
if (!email.matches("[\\w\\.\\-]+@([\\w\\-]+\\.)+[\\w\\-]+")) {
logger.error("邮箱（"+email+"）校验未通过，格式不对!");
return false;
}
String host = "";
String hostName = email.split("@")[1];
//Record: A generic DNS resource record. The specific record types
//extend this class. A record contains a name, type, class, ttl, and rdata.
Record[] result = null;
SMTPClient client = new SMTPClient();
try {
// 查找DNS缓存服务器上为MX类型的缓存域名信息
Lookup lookup = new Lookup(hostName, Type.MX);
lookup.run();
if (lookup.getResult() != Lookup.SUCCESSFUL) {//查找失败
logger.error("邮箱（"+email+"）校验未通过，未找到对应的MX记录!");
return false;
} else {//查找成功
result = lookup.getAnswers();
}
//尝试和SMTP邮箱服务器建立Socket连接
for (int i = 0; i < result.length; i++) {
host = result[i].getAdditionalName().toString();
logger.info("SMTPClient try connect to host:"+host);

//此connect()方法来自SMTPClient的父类:org.apache.commons.net.SocketClient
//继承关系结构：org.apache.commons.net.smtp.SMTPClient-->org.apache.commons.net.smtp.SMTP-->org.apache.commons.net.SocketClient
//Opens a Socket connected to a remote host at the current default port and
//originating from the current host at a system assigned port. Before returning,
//_connectAction_() is called to perform connection initialization actions.
//尝试Socket连接到SMTP服务器
client.connect(host);
//Determine if a reply code is a positive completion response（查看响应码是否正常）.
//All codes beginning with a 2 are positive completion responses（所有以2开头的响应码都是正常的响应）.
//The SMTP server will send a positive completion response on the final successful completion of a command.
if (!SMTPReply.isPositiveCompletion(client.getReplyCode())) {
//断开socket连接
client.disconnect();
continue;
} else {
logger.info("找到MX记录:"+hostName);
logger.info("建立链接成功："+hostName);
break;
}
}
logger.info("SMTPClient ReplyString:"+client.getReplyString());
String emailSuffix="163.com";
String emailPrefix="ranguisheng";
String fromEmail = emailPrefix+"@"+emailSuffix;
//Login to the SMTP server by sending the HELO command with the given hostname as an argument.
//Before performing any mail commands, you must first login.
//尝试和SMTP服务器建立连接,发送一条消息给SMTP服务器
client.login(emailPrefix);
logger.info("SMTPClient login:"+emailPrefix+"...");
logger.info("SMTPClient ReplyString:"+client.getReplyString());

//Set the sender of a message using the SMTP MAIL command,
//specifying a reverse relay path.
//The sender must be set first before any recipients may be specified,
//otherwise the mail server will reject your commands.
//设置发送者，在设置接受者之前必须要先设置发送者
client.setSender(fromEmail);
logger.info("设置发送者 :"+fromEmail);
logger.info("SMTPClient ReplyString:"+client.getReplyString());

//Add a recipient for a message using the SMTP RCPT command,
//specifying a forward relay path. The sender must be set first before any recipients may be specified,
//otherwise the mail server will reject your commands.
//设置接收者,在设置接受者必须先设置发送者，否则SMTP服务器会拒绝你的命令
client.addRecipient(email);
logger.info("设置接收者:"+email);
logger.info("SMTPClient ReplyString:"+client.getReplyString());
logger.info("SMTPClient ReplyCode："+client.getReplyCode()+"(250表示正常)");
if (250 == client.getReplyCode()) {
return true;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
client.disconnect();
} catch (IOException e) {
}
}
return false;
}
public static void main(String[] args) {
System.out.println(isEmailValid("903109360@qq.com"));
}
}