使用JavaMail收发邮件，解决了中文附件名问题

? 几天来一直在开发一个项目，其中一部分需要用 JavaMail 收发邮件，于是就在网上找了一些相关的源代码，最后经过整理和修改，终于好使了，希望能够给使用 JavaMail 收发邮件的朋友提供一个参考 J
??? 使用 JavaMail 收发邮件只需要下载两个开源的 jar 文件， mail.jar 和 activation.jar, 这两个 jar 包可以很容易的在网上找到，这里就不提供下载链接了 J
? 下面是发送邮件SendMail.java（含附件）代码：

//SendMail.java

import?javax.mail.*;

import?javax.mail.internet.*;

import?java.util.*;

import?javax.activation.*;

public?class?SendMail?{

????

????public?static?void?send(String?customMailBoxAddress,String?username,String?password,String?serverMailBoxAddress,String?subject,String?attachmentPath,String?attachmentName)?{

????????//这里面使用新浪作为发送邮件的邮件服务器，其他的smtp服务器可以到相关网站上查到。

????????String?host?=?"smtp.sina.com.cn";

????????//发送方邮箱地址（如BlogJava2006@blog.com.cn.）

????????String?from?=?customMailBoxAddress;

????????//收件人邮箱地址

????????String?to?=?serverMailBoxAddress;

????????//发送者的邮箱用户名

????????String?user?=?username;

????????//发送者的邮箱密码

????????String?ps?=?password;

????????

????????Properties?props?=?new?Properties();

????????

????????//设置发送邮件的邮件服务器的属性（这里使用新浪的smtp服务器）

????????props.put("mail.smtp.host",?host);

????????//需要经过授权，也就是有户名和密码的校验，这样才能通过验证（一定要有//这一条）

????????props.put("mail.smtp.auth",?"true");

????????

????????//用刚刚设置好的props对象构建一个session

????????Session?session?=?Session.getDefaultInstance(props);

????????

????????//有了这句便可以在发送邮件的过程中在console处显示过程信息，供调试使

????????//用（有的时候网络连通性不够好，发送邮件可能会有延迟，在这里面会有所//提示，所以最好是加上这句，避免盲目的等待）

????????session.setDebug(true);

????????

????????//定义消息对象

????????MimeMessage?message?=?new?MimeMessage(session);

????????try{

????????????message.setFrom(new?InternetAddress(from));

????????????message.addRecipient(Message.RecipientType.TO,new?InternetAddress(to));

????????????message.setSubject(subject);

????????????

????????????//?向multipart对象中添加邮件的各个部分内容，包括文本内容和附件

????????????Multipart?multipart?=?new?MimeMultipart();

????????????//设置邮件的文本内容

????????????BodyPart?contentPart?=?new?MimeBodyPart();

????????????contentPart.setText("邮件的具体内容在此");

????????????multipart.?addBodyPart(contentPart);

????????????//添加附件

????????????BodyPart?attachmentPart=?new?MimeBodyPart();

????????????DataSource?source?=?new?FileDataSource(attachmentPath);

????????????attachmentPart.setDataHandler(new?DataHandler(source));

????????????//注意：下面定义的enc对象用来处理中文附件名，否则名称是中文的附//件在邮箱里面显示的会是乱码，

????????????sun.misc.BASE64Encoder?enc?=?new?sun.misc.BASE64Encoder();

????????????messageBodyPart.setFileName("=?GBK?B?"+enc.encode(attachmentName.getBytes())+"?=");

????????????multipart.addBodyPart(messageBodyPart);

????????????

????????????//将multipart对象放到message中

????????????message.setContent(multipart);

????????????//发送邮件

????????????message.saveChanges();

????????????Transport?transport?=?session.getTransport("smtp");

????????????transport.connect(host,?username,?password);

????????????transport.sendMessage(message,?message.getAllRecipients());

????????????transport.close();

????????}catch(Exception?e){

????????????e.printStackTrace();

????????}

????}

}

ReceiveMail.java代码如下：

import?javax.mail.*;

import?java.util.*;

import?java.io.*;

public?class?ReceiveMail?{

????//处理任何一种邮件都需要的方法

????private?void?handle(Message?msg)?throws?Exception?{

????????System.out.println("邮件主题:"?+?msg.getSubject());

????????System.out.println("邮件作者:"?+?msg.getFrom()[0].toString());

????????System.out.println("发送日期:"?+?msg.getSentDate());

????}

????//处理文本邮件

????private?void?handleText(Message?msg)?throws?Exception?{

????????this.handle(msg);

????????System.out.println("邮件内容:"+msg.getContent());

????}

????//处理Multipart邮件，包括了保存附件的功能

????private?static?void?handleMultipart(Message?msg)?throws?Exception?{

????????String?disposition;

????????BodyPart?part;

????????Multipart?mp?=?(Multipart)?msg.getContent();

????????//Miltipart的数量,用于除了多个part,比如多个附件

????????int?mpCount?=?mp.getCount();

????????for?(int?m?=?0;?m?<?mpCount;?m++)?{

????????????this.handle(msg);

????????????part?=?mp.getBodyPart(m);

????????????disposition?=?part.getDisposition();

????????????//判断是否有附件

????????????if?(disposition?!=?null?&&?disposition.equals(Part.ATTACHMENT))

????????????{

????????????????//这个方法负责保存附件

????????????????saveAttach(part);

????????????}?else?{

????????????????//不是附件，就只显示文本内容

????????????????System.out.println(part.getContent());

????????????}

????????}

????}

????private?static?void?saveAttach(BodyPart?part)?throws?Exception?{

????????//得到未经处理的附件名字

????????String?temp?=?part.getFileName();

????????//除去发送邮件时，对中文附件名编码的头和尾，得到正确的附件名

????????//（请参考发送邮件程序SendMail的附件名编码部分）

????????String?s?=?temp.substring(8,?temp.indexOf("?="));

????????//文件名经过了base64编码,下面是解码

????????String?fileName?=?base64Decoder(s);

????????System.out.println("有附件:"?+?fileName);

????????InputStream?in?=?part.getInputStream();

????????FileOutputStream?writer?=?new?FileOutputStream(new?File(

????????????????"保存附件的本地路径"+?"\\"+fileName));

????????byte[]?content?=?new?byte[255];

????????int?read?=?0;

????????while?((read?=?in.read(content))?!=?-1)?{

????????????writer.write(content);

????????}

????????writer.close();

????????in.close();

????}

????//base64解码

????private?static?String?base64Decoder(String?s)?throws?Exception?{

????????sun.misc.BASE64Decoder?decoder?=?new?sun.misc.BASE64Decoder();

????????byte[]?b?=?decoder.decodeBuffer(s);

????????return?(new?String(b));

????}

????public?static?void?receive(String?receiverMailBoxAddress,?String?username,String?password)?{

????????//本人用的是yahoo邮箱，故接受邮件使用yahoo的pop3邮件服务器

????????String?host?=?"pop.mail.yahoo.com.cn";

????????try?{

????????????//连接到邮件服务器并获得邮件

????????????Properties?prop?=?new?Properties();

????????????prop.put("mail.pop3.host",?host);

????????????Session?session?=?Session.getDefaultInstance(prop);

????????????Store?store?=?session.getStore("pop3");

????????????store.connect(host,?username,?password);

????????????Folder?inbox?=?store.getDefaultFolder().getFolder("INBOX");

????????????//设置inbox对象属性为可读写，这样可以控制在读完邮件后直接删除该附件

????????????inbox.open(Folder.READ_WRITE);

????????????Message[]?msg?=?inbox.getMessages();

????????????FetchProfile?profile?=?new?FetchProfile();

????????????profile.add(FetchProfile.Item.ENVELOPE);

????????????inbox.fetch(msg,?profile);

????????????for?(int?i?=?0;?i?<?msg.length;?i++)?{

????????????????//标记此邮件的flag标志对象的DELETED位为true,可以在读完邮件后直接删除该附件，具体执行时间是在调用

????????????????//inbox.close()方法的时候

????????????????msg[i].setFlag(Flags.Flag.DELETED,?true);

????????????????handleMultipart(msg[i]);

????????????????System.out.println("****************************");

????????????}

????????????if?(inbox?!=?null)?{

????????????????//参数为true表明阅读完此邮件后将其删除，更多的属性请参考mail.jar的API

????????????????inbox.close(true);

????????????}

????????????if?(store?!=?null)?{

????????????????store.close();

????????????}

????????}?catch?(Exception?e)?{

????????????e.printStackTrace();

????????}

????}

}

希望对大家使用JavaMail收发邮件有所帮助！

posted on 2006-04-23 21:45 成长的心阅读(54) 评论(1) 编辑收藏收藏至365Key 所属分类: Java&T