MailValidUtil（引入commons-lang-2.6.jar、dnsjava-2.1.7.jar、fastjson-1.2.14.jar包）
import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.ConnectException; import java.net.InetSocketAddress; import java.net.Socket; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import java.util.regex.Pattern; import org.apache.commons.lang.builder.CompareToBuilder; import org.xbill.DNS.Lookup; import org.xbill.DNS.MXRecord; import org.xbill.DNS.Record; import org.xbill.DNS.Type; import com.alibaba.fastjson.JSONObject; /** * * @项目名称: — * @版权所有: — * @技术支持: — * @单元名称: 验证邮箱是否存在工具类 * @开始时间: 2017-10-17 * @开发人员: — */ public class MailValidUtil { public static void main(String[] args) { String email = "info@yiwaixiao.com"; System.out.println(MailValidUtil.valid(email)); } // 邮箱域至少有一个.和两个单词，再严格点那么最后的顶级域至少要2个字母，最大呢？以域名“name”为准，那么最大就是4 private static Pattern emailPattern = Pattern .compile("^(\\\\w) ([\\\\.\\\\-]?[\\\\w ]?)*@(\\\\w) ([\\\\.-]?\\\\w )*((\\\\.\\\\w{2,4}) )$"); /** * 验证邮箱是否存在，由于要读取IO，会造成线程阻塞 * * @param email * 要验证的邮箱 * @return 邮箱是否可达 */ public static JSONObject valid(String email) { JSONObject result = new JSONObject(); result.put("success", false); result.put("code", 400); result.put("msg", "邮箱不存在"); // 发出验证请求的域名(是当前站点的域名，可以任意指定) String domain = "webmail120117.21gmail.com"; if (email == null || email.trim().isEmpty()) { result.put("success", false); result.put("code", 100); result.put("msg", "邮箱不能为空"); return result; } if (!emailPattern.matcher(email).matches()) { result.put("success", false); result.put("code", 100); result.put("msg", "邮箱格式不正确"); return result; } String host = email.split("@")[1]; if (domain.equals(host)) { result.put("success", false); result.put("code", 100); result.put("msg", "主机域名不能和发出验证请求的域名[" domain "]一样"); return result; } Socket socket = new Socket(); InputStream is = null; BufferedInputStream bis = null; InputStreamReader isr = null; BufferedReader bufferedReader = null; OutputStream os = null; OutputStreamWriter osw = null; BufferedWriter bufferedWriter = null; try { // 查找mx记录，查找DNS缓存服务器上为MX类型的缓存域名信息 Record[] mxRecords = new Lookup(host, Type.MX).run(); if (mxRecords == null || mxRecords.length == 0) { result.put("success", false); result.put("code", 400); result.put("msg", "查找不到MX记录"); return result; } // 邮件服务器地址 String mxHost = ((MXRecord) mxRecords[0]).getTarget().toString(); if (mxRecords.length > 1) { // 优先级排序 List<Record> arrRecords = new ArrayList<Record>(); Collections.addAll(arrRecords, mxRecords); Collections.sort(arrRecords, new Comparator<Record>() { public int compare(Record record, Record record2) { return new CompareToBuilder().append( ((MXRecord) record).getPriority(), ((MXRecord) record2).getPriority()) .toComparison(); } }); mxHost = ((MXRecord) arrRecords.get(0)).getTarget().toString(); } // 开始smtp socket.connect(new InetSocketAddress(mxHost, 25)); // 输入流 is = socket.getInputStream(); bis = new BufferedInputStream(is); isr = new InputStreamReader(bis); bufferedReader = new BufferedReader(isr); // 输出流 os = socket.getOutputStream(); osw = new OutputStreamWriter(os); bufferedWriter = new BufferedWriter(osw); // 超时时间(毫秒) long timeout = 6000; // 睡眠时间片段(毫秒) int sleepSect = 50; // 相应码 int responseCode = 0; responseCode = getResponseCode(timeout, sleepSect, bufferedReader); // 连接(服务器是否就绪) if (responseCode != 220) { result.put("success", false); result.put("code", 400); result.put("msg", "连接邮箱服务器失败，服务器未就绪完毕"); return result; } // 握手 bufferedWriter.write("HELO " domain "rn"); bufferedWriter.flush(); responseCode = getResponseCode(timeout, sleepSect, bufferedReader); if (responseCode != 250) { result.put("success", false); result.put("code", 400); result.put("msg", "与邮箱服务器握手失败"); return result; } // 身份 bufferedWriter.write("MAIL FROM: <check@" domain ">rn"); bufferedWriter.flush(); responseCode = getResponseCode(timeout, sleepSect, bufferedReader); if (responseCode != 250) { result.put("success", false); result.put("code", 400); result.put("msg", "与邮箱服务器握手失败"); return result; } // 验证 bufferedWriter.write("RCPT TO: <" email ">rn"); bufferedWriter.flush(); responseCode = getResponseCode(timeout, sleepSect, bufferedReader); if (responseCode != 250) { result.put("success", false); result.put("code", 400); result.put("msg", "邮箱与邮箱服务器不可通信，邮箱不存在"); return result; } // 断开 bufferedWriter.write("QUITrn"); bufferedWriter.flush(); result.put("success", true); result.put("code", 200); result.put("msg", "邮箱存在"); } catch (ConnectException e) { result.put("success", false); result.put("code", 100); result.put("msg", "请求超时，请稍后重新尝试"); } catch (Exception e) { e.printStackTrace(); result.put("success", false); result.put("code", 500); result.put( "msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } finally { // 关闭资源 closeAll(result, socket, is, bis, isr, bufferedReader, os, osw, bufferedWriter); } return result; } /** 读取响应码 */ private static int getResponseCode(long timeout, int sleepSect, BufferedReader bufferedReader) throws InterruptedException, NumberFormatException, IOException { int code = 0; for (long i = sleepSect; i < timeout; i = sleepSect) { Thread.sleep(sleepSect); if (bufferedReader.ready()) { String outline = bufferedReader.readLine(); while (bufferedReader.ready()) { bufferedReader.readLine(); } //System.out.println(outline); code = Integer.parseInt(outline.substring(0, 3)); break; } } return code; } /** 关闭资源 */ private static void closeAll(JSONObject result, Socket socket, InputStream is, BufferedInputStream bis, InputStreamReader isr, BufferedReader bufferedReader, OutputStream os, OutputStreamWriter osw, BufferedWriter bufferedWriter) { if (is != null) { try { is.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } if (bis != null) { try { bis.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } if (isr != null) { try { isr.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } if (bufferedReader != null) { try { bufferedReader.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } if (os != null) { try { os.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } if (osw != null) { try { osw.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } if (bufferedWriter != null) { try { bufferedWriter.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } if (socket != null) { try { socket.close(); } catch (IOException e) { result.put("success", false); result.put("code", 500); result.put("msg", "请求异常，异常信息：" e.getClass().getName() "->" e.getMessage()); } } } }
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