使用commons email发送邮件
在项目中，一直来是使用spring对java mail的封装，来发邮件的。虽然spring的封装已经大大简化了发送邮件的复杂度，但是今天要介绍下apache commons email组件，对java mail进行了更好的封装，对于客户端的调用，已经是相当地方便了。commons-email maven库地址：
<dependency>
<groupId>commons-email</groupId>
<artifactId>commons-email</artifactId>
<version>1.1</version>
</dependency>
commons-email实现是相当的简单，下面介绍下几个重要的类实现
1）Email
一个抽象类，对java mail进行了封装，提供主要接口如下
setHostName(String)：设置smtp服务器地址
setSmtpPort(int)：设置smtp服务器端
setAuthenticator(Authenticator)：设置授权帐号和密码
setSSL(boolean ssl)：是否采用ssl方式连接服务
setMailSession(Session)：设置与服务器连接session
setCharset(String)：设置邮件主体编码
setFrom(String)：设置发件人地址
addTo(String)：添加收件人地址
addCc(String)：添加抄送人地址
addBcc(String)：添加密送人地址
addReplyTo(String)：添加回复人地址
setSubject(String)：设置邮件标题
setMsg(String)：设置邮件主体
send()：发送邮件
2）SimpleEmail
继承Email，实现了setMsg(String msg)方法，发送文本格式邮件，调用非常简单
SimpleEmail email
=
new
SimpleEmail();
email.setSSL( true );
email.setSmtpPort(SMTP_PORT);
email.setHostName(SMTP_SERVER);
email.setAuthentication(USER_NAME, PASSWORD);
email.addTo( " **@**.com " );
email.setFrom( " **@**.com " );
email.setSubject( " subject " );
email.setCharset( " GBK " );
email.setMsg( " message " );
email.send();
email.setSSL( true );
email.setSmtpPort(SMTP_PORT);
email.setHostName(SMTP_SERVER);
email.setAuthentication(USER_NAME, PASSWORD);
email.addTo( " **@**.com " );
email.setFrom( " **@**.com " );
email.setSubject( " subject " );
email.setCharset( " GBK " );
email.setMsg( " message " );
email.send();
3）MultiPartEmail
继承Email，多了一个添加附件的方法：
attach(URL, String, String)
attach(URL, String, String, String)
attach(DataSource, String, String)
attach(DataSource, String, String, String)
attach(EmailAttachment)
调用方式如下：
MultiPartEmail email
=
new
MultiPartEmail();
email.setSSL( true );
email.setSmtpPort(SMTP_PORT);
email.setHostName(SMTP_SERVER);
email.setAuthentication(USER_NAME, PASSWORD);
email.addTo( " **@**.com " );
email.setFrom( " **@**.com " );
email.setSubject( " subject " );
email.setCharset( " GBK " );
email.setMsg( " message " );
email.attach( " file:///***.pom.xml " , " pom.xml " , " pom " );
email.send();
email.setSSL( true );
email.setSmtpPort(SMTP_PORT);
email.setHostName(SMTP_SERVER);
email.setAuthentication(USER_NAME, PASSWORD);
email.addTo( " **@**.com " );
email.setFrom( " **@**.com " );
email.setSubject( " subject " );
email.setCharset( " GBK " );
email.setMsg( " message " );
email.attach( " file:///***.pom.xml " , " pom.xml " , " pom " );
email.send();
4）HtmlEmail
继承MultiPartEmail，与SimpleEmail相比，多了一个setHtmlMsg(String msg)方法，用户设置html格式内容，调用方式同SimpleEmail几乎一致
HtmlEmail email
=
new
HtmlEmail();
email.setSSL( true );
email.setSmtpPort(SMTP_PORT);
email.setHostName(SMTP_SERVER);
email.setAuthentication(USER_NAME, PASSWORD);
email.addTo( " **@**.com " );
email.setFrom( " **@**.com " );
email.setSubject( " subject " );
email.setCharset( " GBK " );
email.setHtmlMsg( " <html><body><b>this is email message!</body></html> " );
email.send();
email.setSSL( true );
email.setSmtpPort(SMTP_PORT);
email.setHostName(SMTP_SERVER);
email.setAuthentication(USER_NAME, PASSWORD);
email.addTo( " **@**.com " );
email.setFrom( " **@**.com " );
email.setSubject( " subject " );
email.setCharset( " GBK " );
email.setHtmlMsg( " <html><body><b>this is email message!</body></html> " );
email.send();
当然，commons email只提供了对smtp协议的封装，不包括对pop协议的封装，所以只能发送邮件，不能接受邮件。