java发送邮件(带附件)
需要下载一个Email.jar包
package com.zlz3907.mail;

import java.io.BufferedReader; 

import java.io.File; 

import java.io.FileInputStream; 

import java.io.FileNotFoundException; 

import java.io.IOException; 

import java.io.InputStream; 

import java.io.InputStreamReader; 

import java.io.PrintWriter; 

import java.io.UnsupportedEncodingException; 

import java.net.Socket; 

import java.nio.charset.Charset; 

import java.text.SimpleDateFormat; 

import java.util.ArrayList; 

import java.util.Date; 

import java.util.HashMap; 

import java.util.List; 

import java.util.Map; 


import sun.misc.BASE64Encoder; 


/** 

 * 该类使用Socket连接到邮件服务器, 

 * 并实现了向指定邮箱发送邮件及附件的功能。 

 * 可带附件 

 * @author Zhong Lizhi 

 */ 

public class Mail { 


 /** 

 * 换行符 

 */ 

 private static final String LINE_END = "\r\n"; 


 /** 

 * 值为“true”输出高度信息(包括服务器响应信息),值为“ 

 * false”则不输出调试信息。 

 */ 

 private boolean isDebug = true; 


 /** 

 * 值为“true”则在发送邮件{@link Mail#send()} 

 * 过程中会读取服务器端返回的消息, 

 * 并在邮件发送完毕后将这些消息返回给用户。 

 */ 

 private boolean isAllowReadSocketInfo = true; 


 /** 

 * 邮件服务器地址 

 */ 

 private String host; 


 /** 

 * 发件人邮箱地址 

 */ 

 private String from; 


 /** 

 * 收件人邮箱地址 

 */ 

 private List<String> to; 


 /** 

 * 抄送地址 

 */ 

 private List<String> cc; 


 /** 

 * 暗送地址 

 */ 

 private List<String> bcc; 


 /** 

 * 邮件主题 

 */ 

 private String subject; 


 /** 

 * 用户名 

 */ 

 private String user; 


 /** 

 * 密码 

 */ 

 private String password; 


 /** 

 * MIME邮件类型 

 */ 

 private String contentType; 


 /** 

 * 用来绑定多个邮件单元{@link #partSet} 

 * 的分隔标识,我们可以将邮件的正文及每一个附件都看作是一个邮件单元 

 * 。 

 */ 

 private String boundary; 


 /** 

 * 邮件单元分隔标识符,该属性将用来在邮件中作为分割各个邮件单元的标识 

 * 。 

 */ 

 private String boundaryNextPart; 


 /** 

 * 传输邮件所采用的编码 

 */ 

 private String contentTransferEncoding; 


 /** 

 * 设置邮件正文所用的字符集 

 */ 

 private String charset; 


 /** 

 * 内容描述 

 */ 

 private String contentDisposition; 


 /** 

 * 邮件正文 

 */ 

 private String content; 


 /** 

 * 发送邮件日期的显示格式 

 */ 

 private String simpleDatePattern; 


 /** 

 * 附件的默认MIME类型 

 */ 

 private String defaultAttachmentContentType; 


 /** 

 * 邮件单元的集合,用来存放正文单元和所有的附件单元。 

 */ 

 private List<MailPart> partSet; 


 /** 

 * 不同类型文件对应的{@link MIME} 类型映射。在添加附件 

 * {@link #addAttachment(String)} 

 * 时,程序会在这个映射中查找对应文件的 {@link MIME} 

 * 类型,如果没有, 则使用 

 * {@link #defaultAttachmentContentType} 

 * 所定义的类型。 

 */ 

 private static Map<String, String> contentTypeMap; 


 static { 

 // MIME Media Types 

 contentTypeMap = new HashMap<String, String>(); 

 contentTypeMap.put("xls", "application/vnd.ms-excel"); 

 contentTypeMap.put("xlsx", "application/vnd.ms-excel"); 

 contentTypeMap.put("xlsm", "application/vnd.ms-excel"); 

 contentTypeMap.put("xlsb", "application/vnd.ms-excel"); 

 contentTypeMap.put("doc", "application/msword"); 

 contentTypeMap.put("dot", "application/msword"); 

 contentTypeMap.put("docx", "application/msword"); 

 contentTypeMap.put("docm", "application/msword"); 

 contentTypeMap.put("dotm", "application/msword"); 

 } 

 /** 

 * 该类用来实例化一个正文单元或附件单元对象,他继承了 

 * {@link Mail} 

 * ,在这里制作这个子类主要是为了区别邮件单元对象和邮件服务对象 

 * ,使程序易读一些。 这些邮件单元全部会放到partSet 

 * 中,在发送邮件 {@link #send()}时, 程序会调用 

 * {@link #getAllParts()} 

 * 方法将所有的单元合并成一个符合MIME格式的字符串。 

 * 

 * @author Zhong Lizhi 

 */ 

 private class MailPart extends Mail { 

 public MailPart() { 

 } 

 } 


 /** 

 * 默认构造函数 

 */ 

 public Mail() { 

 defaultAttachmentContentType = "application/octet-stream"; 

 simpleDatePattern = "yyyy-MM-dd HH:mm:ss"; 

 boundary = "--=_NextPart_zlz_3907_" + System.currentTimeMillis(); 

 boundaryNextPart = "--" + boundary; 

 contentTransferEncoding = "base64"; 

 contentType = "multipart/alternative"; 

 charset = Charset.defaultCharset().name(); 

 partSet = new ArrayList<MailPart>(); 

 to = new ArrayList<String>(); 

 cc = new ArrayList<String>(); 

 bcc = new ArrayList<String>(); 

 } 


 /** 

 * 根据指定的完整文件名在 

 * {@link #contentTypeMap} 

 * 中查找其相应的MIME类型, 如果没找到,则返回 

 * {@link #defaultAttachmentContentType} 

 * 所指定的默认类型。 

 * 

 * @param fileName 

 * 文件名 

 * @return 返回文件对应的MIME类型。 

 */ 

 private String getPartContentType(String fileName) { 

 String ret = null; 

 if (null != fileName) { 

 int flag = fileName.lastIndexOf("."); 

 if (0 <= flag && flag < fileName.length() - 1) { 

 fileName = fileName.substring(flag + 1); 

 } 

 ret = contentTypeMap.get(fileName); 

 } 


 if (null == ret) { 

 ret = defaultAttachmentContentType; 

 } 

 return ret; 

 } 


 /** 

 * 将给定字符串转换为base64编码的字符串 

 * 

 * @param str 

 * 需要转码的字符串 

 * @param charset 

 * 原字符串的编码格式 

 * @return base64编码格式的字符 

 */ 

 private String toBase64(String str, String charset) { 

 if (null != str) { 

 try { 

 return toBase64(str.getBytes(charset)); 

 } catch (UnsupportedEncodingException e) { 

 e.printStackTrace(); 

 } 

 } 

 return ""; 

 } 


 /** 

 * 将指定的字节数组转换为base64格式的字符串 

 * 

 * @param bs 

 * 需要转码的字节数组 

 * @return base64编码格式的字符 

 */ 

 private String toBase64(byte[] bs) { 

 return new BASE64Encoder().encode(bs); 

 } 


 /** 

 * 将给定字符串转换为base64编码的字符串 

 * 

 * @param str 

 * 需要转码的字符串 

 * @return base64编码格式的字符 

 */ 

 private String toBase64(String str) { 

 return toBase64(str, Charset.defaultCharset().name()); 

 } 


 /** 

 * 将所有的邮件单元按照标准的MIME格式要求合并。 

 * 

 * @return 返回一个所有单元合并后的字符串。 

 */ 

 private String getAllParts() { 

 int partCount = partSet.size(); 

 StringBuilder sbd = new StringBuilder(LINE_END); 

 for (int i = partCount - 1; i >= 0; i--) { 

 Mail attachment = partSet.get(i); 

 String attachmentContent = attachment.getContent(); 

 if (null != attachmentContent && 0 < attachmentContent.length()) { 

 sbd.append(getBoundaryNextPart()).append(LINE_END); 

 sbd.append("Content-Type: "); 

 sbd.append(attachment.getContentType()); 

 sbd.append(LINE_END); 

 sbd.append("Content-Transfer-Encoding: "); 

 sbd.append(attachment.getContentTransferEncoding()); 

 sbd.append(LINE_END); 

 if (i != partCount - 1) { 

 sbd.append("Content-Disposition: "); 

 sbd.append(attachment.getContentDisposition()); 

 sbd.append(LINE_END); 

 } 


 sbd.append(LINE_END); 

 sbd.append(attachment.getContent()); 

 sbd.append(LINE_END); 

 } 

 } 


 sbd.append(LINE_END); 

 sbd.append(LINE_END); 

 // sbd.append(boundaryNextPart). 

 // append(LINE_END); 

 partSet.clear(); 

 return sbd.toString(); 

 } 


 /** 

 * 添加邮件正文单元 

 */ 

 private void addContent() { 

 if (null != content) { 

 MailPart part = new MailPart(); 

 part.setContent(toBase64(content)); 

 part.setContentType("text/plain;charset=\"" + charset + "\""); 

 partSet.add(part); 

 } 

 } 


 private String listToMailString(List<String> mailAddressList) { 

 StringBuilder sbd = new StringBuilder(); 

 if (null != mailAddressList) { 

 int listSize = mailAddressList.size(); 

 for (int i = 0; i < listSize; i++) { 

 if (0 != i) { 

 sbd.append(";"); 

 } 

 sbd.append("<").append(mailAddressList.get(i)).append(">"); 

 } 

 } 

 return sbd.toString(); 

 } 


 private List<String> getrecipient() { 

 List<String> list = new ArrayList<String>(); 

 list.addAll(to); 

 list.addAll(cc); 

 list.addAll(bcc); 

 return list; 

 } 


 /** 

 * 添加一个附件单元 

 * 

 * @param filePath 

 * 文件路径 

 */ 

 public void addAttachment(String filePath) { 

 addAttachment(filePath, null); 

 } 


 public void addTo(String mailAddress) { 

 this.to.add(mailAddress); 

 } 


 public void addCc(String mailAddress) { 

 this.cc.add(mailAddress); 

 } 


 public void addBcc(String mailAddress) { 

 this.bcc.add(mailAddress); 

 } 


 /** 

 * 添加一个附件单元 

 * 

 * @param filePath 

 * 文件路径 

 * @param charset 

 * 文件编码格式 

 */ 

 public void addAttachment(String filePath, String charset) { 

 if (null != filePath && filePath.length() > 0) { 

 File file = new File(filePath); 

 try { 

 addAttachment(file.getName(), new FileInputStream(file), 

 charset); 

 } catch (FileNotFoundException e) { 

 System.out.println("错误:" + e.getMessage()); 

 System.exit(1); 

 } 

 } 

 } 


 /** 

 * 添加一个附件单元 

 * 

 * @param fileName 

 * 文件名 

 * @param attachmentStream 

 * 文件流 

 * @param charset 

 * 文件编码格式 

 */ 

 public void addAttachment(String fileName, InputStream attachmentStream, 

 String charset) { 

 try { 


 byte[] bs = null; 

 if (null != attachmentStream) { 

 int buffSize = 1024; 

 byte[] buff = new byte[buffSize]; 

 byte[] temp; 

 bs = new byte[0]; 

 int readTotal = 0; 

 while (-1 != (readTotal = attachmentStream.read(buff))) { 

 temp = new byte[bs.length]; 

 System.arraycopy(bs, 0, temp, 0, bs.length); 

 bs = new byte[temp.length + readTotal]; 

 System.arraycopy(temp, 0, bs, 0, temp.length); 

 System.arraycopy(buff, 0, bs, temp.length, readTotal); 

 } 

 } 


 if (null != bs) { 

 MailPart attachmentPart = new MailPart(); 

 charset = null != charset ? charset : Charset.defaultCharset() 

 .name(); 

 String contentType = getPartContentType(fileName) 

 + ";name=\"=?" + charset + "?B?" + toBase64(fileName) 

 + "?=\""; 

 attachmentPart.setCharset(charset); 

 attachmentPart.setContentType(contentType); 

 attachmentPart.setContentDisposition("attachment;filename=\"=?" 

 + charset + "?B?" + toBase64(fileName) + "?=\""); 

 attachmentPart.setContent(toBase64(bs)); 

 partSet.add(attachmentPart); 

 } 


 } catch (Exception e) { 

 e.printStackTrace(); 

 } finally { 

 if (null != attachmentStream) { 

 try { 

 attachmentStream.close(); 

 attachmentStream = null; 

 } catch (IOException e) { 

 e.printStackTrace(); 

 } 

 } 


 Runtime.getRuntime().gc(); 

 Runtime.getRuntime().runFinalization(); 

 } 

 } 


 /** 

 * 发送邮件 

 * 

 * @return 邮件服务器反回的信息 

 */ 

 public String send() { 


 // 对象申明 

 // 当邮件发送完毕后,以下三个对象(Socket、 

 // PrintWriter, 

 // BufferedReader)需要关闭。 

 Socket socket = null; 

 PrintWriter pw = null; 

 BufferedReader br = null; 


 try { 

 socket = new Socket(host, 25); 

 pw = new PrintWriter(socket.getOutputStream()); 

 br = new BufferedReader(new InputStreamReader(socket 

 .getInputStream())); 


 StringBuilder infoBuilder = new StringBuilder( 

 "\nServer info: \n------------\n"); 


 // 与服务器建立连接 

 pw.write("HELO ".concat(host).concat(LINE_END)); // 连接到邮件服务 

 if (!readResponse(pw, br, infoBuilder, "220")) 

 return infoBuilder.toString(); 


 pw.write("AUTH LOGIN".concat(LINE_END)); // 登录 

 if (!readResponse(pw, br, infoBuilder, "250")) 

 return infoBuilder.toString(); 


 pw.write(toBase64(user).concat(LINE_END)); // 输入用户名 

 if (!readResponse(pw, br, infoBuilder, "334")) 

 return infoBuilder.toString(); 


 pw.write(toBase64(password).concat(LINE_END)); // 输入密码 

 if (!readResponse(pw, br, infoBuilder, "334")) 

 return infoBuilder.toString(); 


 pw.write("MAIL FROM:<" + from + ">" + LINE_END); // 发件人邮箱地址 

 if (!readResponse(pw, br, infoBuilder, "235")) 

 return infoBuilder.toString(); 


 List<String> recipientList = getrecipient(); 

 // 收件邮箱地址 

 for (int i = 0; i < recipientList.size(); i++) { 

 pw.write("RCPT TO:<" + recipientList.get(i) + ">" + LINE_END); 

 if (!readResponse(pw, br, infoBuilder, "250")) 

 return infoBuilder.toString(); 

 } 

 // System.out.println( 

 // getAllSendAddress()); 


 pw.write("DATA" + LINE_END); // 开始输入邮件 

 if (!readResponse(pw, br, infoBuilder, "250")) 

 return infoBuilder.toString(); 


 flush(pw); 


 // 设置邮件头信息 

 StringBuffer sbf = new StringBuffer("From: <" + from + ">" 

 + LINE_END); // 发件人 

 sbf.append("To: " + listToMailString(to) + LINE_END);// 收件人 

 sbf.append("Cc: " + listToMailString(cc) + LINE_END);// 收件人 

 sbf.append("Bcc: " + listToMailString(bcc) + LINE_END);// 收件人 

 sbf.append("Subject: " + subject + LINE_END);// 邮件主题 

 SimpleDateFormat sdf = new SimpleDateFormat(simpleDatePattern); 

 sbf.append("Date: ").append(sdf.format(new Date())); 

 sbf.append(LINE_END); // 发送时间 

 sbf.append("Content-Type: "); 

 sbf.append(contentType); 

 sbf.append(";"); 

 sbf.append("boundary=\""); 

 sbf.append(boundary).append("\""); // 邮件类型设置 

 sbf.append(LINE_END); 

 sbf.append("This is a multi-part message in MIME format."); 

 sbf.append(LINE_END); 


 // 添加邮件正文单元 

 addContent(); 


 // 合并所有单元,正文和附件。 

 sbf.append(getAllParts()); 


 // 发送 

 sbf.append(LINE_END).append(".").append(LINE_END); 

 pw.write(sbf.toString()); 

 readResponse(pw, br, infoBuilder, "354"); 

 flush(pw); 


 // QUIT退出 

 pw.write("QUIT" + LINE_END); 

 if (!readResponse(pw, br, infoBuilder, "250")) 

 return infoBuilder.toString(); 

 flush(pw); 


 return infoBuilder.toString(); 

 } catch (Exception e) { 

 e.printStackTrace(); 

 return "Exception:>" + e.getMessage(); 

 } finally { 

 // 释放资源 

 try { 

 if (null != socket) 

 socket.close(); 

 if (null != pw) 

 pw.close(); 

 if (null != br) 

 br.close(); 

 } catch (IOException e) { 

 e.printStackTrace(); 

 } 


 // this.to.clear(); 

 // this.cc.clear(); 

 // this.bcc.clear(); 

 this.partSet.clear(); 

 } 


 } 


 /** 

 * 将SMTP命令发送到邮件服务器 

 * 

 * @param pw 

 * 邮件服务器输入流 

 */ 

 private void flush(PrintWriter pw) { 

 if (!isAllowReadSocketInfo) { 

 pw.flush(); 

 } 

 } 


 /** 

 * 读取邮件服务器的响应信息 

 * 

 * @param pw 

 * 邮件服务器输入流 

 * @param br 

 * 邮件服务器输出流 

 * @param infoBuilder 

 * 用来存放服务器响应信息的字符串缓冲 

 * @param msgCode 

 * @return 

 * @throws IOException 

 */ 

 private boolean readResponse(PrintWriter pw, BufferedReader br, 

 StringBuilder infoBuilder, String msgCode) throws IOException { 

 if (isAllowReadSocketInfo) { 

 pw.flush(); 

 String message = br.readLine(); 

 infoBuilder.append("SERVER:/>"); 

 infoBuilder.append(message).append(LINE_END); 

 if (null == message || 0 > message.indexOf(msgCode)) { 

 System.out.println("ERROR: " + message); 

 pw.write("QUIT".concat(LINE_END)); 

 pw.flush(); 

 return false; 

 } 

 if (isDebug) { 

 System.out.println("DEBUG:/>" + msgCode + "/" + message); 

 } 

 } 

 return true; 

 } 


 public String getBoundaryNextPart() { 

 return boundaryNextPart; 

 } 


 public void setBoundaryNextPart(String boundaryNextPart) { 

 this.boundaryNextPart = boundaryNextPart; 

 } 


 public String getDefaultAttachmentContentType() { 

 return defaultAttachmentContentType; 

 } 


 public void setDefaultAttachmentContentType( 

 String defaultAttachmentContentType) { 

 this.defaultAttachmentContentType = defaultAttachmentContentType; 

 } 


 public String getHost() { 

 return host; 

 } 


 public void setHost(String host) { 

 this.host = host; 

 } 


 public String getFrom() { 

 return from; 

 } 


 public void setFrom(String from) { 

 this.from = from; 

 } 


 public List<String> getTo() { 

 return to; 

 } 


 public void setTo(List<String> to) { 

 this.to = to; 

 } 


 public String getSubject() { 

 return subject; 

 } 


 public void setSubject(String subject) { 

 this.subject = subject; 

 } 


 public String getUser() { 

 return user; 

 } 


 public void setUser(String user) { 

 this.user = user; 

 } 


 public String getPassword() { 

 return password; 

 } 


 public void setPassword(String password) { 

 this.password = password; 

 } 


 public String getContentType() { 

 return contentType; 

 } 


 public void setContentType(String contentType) { 

 this.contentType = contentType; 

 } 


 public String getBoundary() { 

 return boundary; 

 } 


 public void setBoundary(String boundary) { 

 this.boundary = boundary; 

 } 


 public String getContentTransferEncoding() { 

 return contentTransferEncoding; 

 } 


 public void setContentTransferEncoding(String contentTransferEncoding) { 

 this.contentTransferEncoding = contentTransferEncoding; 

 } 


 public String getCharset() { 

 return charset; 

 } 


 public void setCharset(String charset) { 

 this.charset = charset; 

 } 


 public String getContentDisposition() { 

 return contentDisposition; 

 } 


 public void setContentDisposition(String contentDisposition) { 

 this.contentDisposition = contentDisposition; 

 } 


 public String getSimpleDatePattern() { 

 return simpleDatePattern; 

 } 


 public void setSimpleDatePattern(String simpleDatePattern) { 

 this.simpleDatePattern = simpleDatePattern; 

 } 


 public String getContent() { 

 return content; 

 } 


 public void setContent(String content) { 

 this.content = content; 

 } 


 public boolean isAllowReadSocketInfo() { 

 return isAllowReadSocketInfo; 

 } 


 public void setAllowReadSocketInfo(boolean isAllowReadSocketInfo) { 

 this.isAllowReadSocketInfo = isAllowReadSocketInfo; 

 } 


 /** 

 * @param args 

 */ 

 public static void main(String[] args) { 

 // 应用示例:线程化发送邮件 

 new Thread() { 

 @Override 

 public void run() { 

 System.out.println("SENDER-" + this.getId() + ":/>" 

 + "开始发送邮件..."); 


 // 创建邮件对象 

 Mail mail = new Mail(); 

 mail.addCc("test@m1.com"); 

 mail.addBcc("test@m2.com"); 

 mail.setSubject("CC Test Mail!!"); // 邮件主题 

 mail.setUser("yanyuanyuan101@163.com"); // 用户名 

 mail.setPassword("100982"); // 密码 

 mail.setContent("这是一个测试,请不要回复!"); // 邮件正文 

 mail.addAttachment("/utf8中.txt"); // 添加附件 

// for(int i=1;i<14;i++){ 

// mail.addAttachment("d:\\mg"+i+".jpg"); // 添加附件 

// } 

 // mail.addAttachment( 

 // "e:/test.htm"); // 

 // 添加附件 


 System.out.println(mail.send()); // 发送 


 System.out.println("SENDER-" + this.getId() + ":/>" 

 + "邮件已发送完毕!"); 

 } 

 }.start(); 


 } 


}