使用Spring的javamail注意的中文问题
使用Spring 的封装的MailSender，确实省事多了！
但在使用中,还是得注意些问题
1.增加验证,否则会报:553 authentication is required 的错误信息
Properties prop = new Properties();
prop.setProperty("mail.smtp.auth", "true");
JavaMailSenderImpl.setJavaMailProperties(prop);
2.当邮件内容是HTML语言时的中文问题:
初始化MimeMessageHelper辅助类时，设置"GBK" encoding！
如：
MimeMessageHelper messageHelp = new MimeMessageHelper(message,true,"GBK");
同时在设置：<META http-equiv=Content-Type content='text/html; charset=GBK'>
如果都设置为"UTF-8"，在某些邮件客户端标题是冷僻字时，不能正常显示！
3.邮件附件的中文问题！
spring的文档里面说MimeMessageHelper设置了encoding,同时对title,text,attach产生作用，但还是会出问题：
解决方法：MimeUtility.encodeWord(file.getName());就ＯＫ了！
以下是可以运行的代码
SendMailDemo.java
import java.io.File;import java.io.UnsupportedEncodingException;import java.util.Properties;import javax.mail.MessagingException;import javax.mail.internet.MimeMessage;import javax.mail.internet.MimeUtility;import org.springframework.mail.javamail.JavaMailSenderImpl;import org.springframework.mail.javamail.MimeMessageHelper;public class SendMailDemo {public void send163ByMutil() throws MessagingException {JavaMailSenderImpl javaMail = new JavaMailSenderImpl();javaMail.setHost("smtp.163.com");javaMail.setPassword("passowrd");javaMail.setUsername("username");Properties prop = new Properties();prop.setProperty("mail.smtp.auth", "true");javaMail.setJavaMailProperties(prop);MimeMessage message = javaMail.createMimeMessage();MimeMessageHelper messageHelp = new MimeMessageHelper(message,true,"GBK");messageHelp.setFrom("likun35@163.com");messageHelp.setTo("likun35@163.com");messageHelp.setSubject("邮件测试");// messageHelpString body = "<html><head><META http-equiv=Content-Type content='text/html; charset=GBK'></HEAD><title>test</title></head><body>dear 小燕子 \n ";body+="<red>This is Text!</red> pic <img src='cid:a'></img><br>hello<img src='cid:b'></img></body></html>";messageHelp.setText(body, true);messageHelp.addInline("a", new File("E:/xiezi.jpg"));messageHelp.addInline("b", new File("E:/logo.png"));File file=new File("E:/Favorites中文文件.rar");try {messageHelp.addAttachment(MimeUtility.encodeWord(file.getName()), file);} catch (UnsupportedEncodingException e) {e.printStackTrace();}javaMail.send(message);}public static void main(String[] args) throws MessagingException {SendMail send=new SendMail();send.send163ByMutil();}}