Java Mail java_web_CH9

Java Web adv CH9 Java mail
Destination:Let us know how to use java  to send a email
(一)
	在发送之前需要需要具备的东西有javamail1_4_4版本的组件
	如果需要在局网或者广域网中搭建一个环境,可以使用WinMail软件来作为服务器(很好很强大)!
	首先需要了解E-Mail中的几个协议:
	SMTP(Simple Mail Transfer Protocol)         简单邮件传输协议,用于邮件的传输
	POP3(Post Office Protocal Version 3)        邮局协议第三版,用户邮件的接受
	IMAP(Internet Message Access Protocol)      因特网消息访问协议,用于传输和接受但是普及率较低
	JAF(JavaBeans Activation Framework)         JavaBeans激活框架
(二)
	在这里我来用代码演示一个比较完整的有邮件的发送(包含发送附件)
	//注:由于涉及到了文件的上传所以代码是写在servlet中的,还有不要忘记上传的库SmartUpload
	//还有就是javamail1_4_4中的包会与系统中的javax.mail包冲突
	//解决方案:找到系统包(X:\Program Files\Java\Common\plugins\com.genuitec.eclipse.j2eedt.core_8.5.0.me201003231033\data\libraryset\EE_5\javaee.jar)
	//采用压缩包的方式打开并删除javax.mail包即可
	
	<!--运行在servlet中的代码
	try{
		//get the instance of the Properties(java.util),and set the value
		Properties props=new Properties();
		props.put("mail.smtp.auth","true");//only can be this
		//get the instance of the Session(javax.mail)
		Session session=Session.getInstance(props);
		//get the instance of the Message
		Message msg=new MimeMessage();
		//get the instance of the SmartUpload
		SmartUpload su=new SmartUpload();
		su.initialize(super.getServletConf,request,response);
		//get the Files and the File (Files and File both come from com.jspsmart.upload.*)
		Files files=su.getFiles();
		File file=files.getFile(0);
		boolean contentAlreadyBeSetted=false;
		//to make a judgement
		if(!file.isMissing()){
			//get the path of WebRoot
			String filePath=this.getServletContext.getRealpath("/")+System.currentTimeMillis()+file.getFileName();
			//save the file
			file.saveAs(filePath);
			//get the MultiPart
			Multipart mp=new MimeMultipart();
			//get Body Part
			BodyPart bp=new MimeBodyPart();
			//get the FileDataSource
			//Becareful The File must be the java.io.File not the com.smartupload.file
			//It takes me a few of time to check it
			FileDataSource fds=new FileDataSource(new java.io.File(filePath));
			//set file data source into the BodyPart
			bp.setDataHander(new DataHander(fds));
			//set the name when it be downloaded
			bp.setFileName(file.getFileName());
			//put BodyPart into the Multipart
			mp.addBodyPart(bp);
			//put the multipart into the message
			msg.setContent(mp);
			//remeber to make a mark the the content is already be setted!
			contentAlreadyBeSetted=true;
		}
		msg.setSubject("the title of the e-mail");
		msg.setRecipient(Message.RecipientType.TO,new InternetAddress("the people who receive this e-mail"));
		msg.setFrom(new InternetAddress("the people  who send this e-mail"));
		msg.setSentDate(new Date());
		if(!contentAreadyBeSetted){
			//Attention:There will be a mistake without judegement of the content set,
			//as a result of the coder who write setcontent() and setText() ,the content only will be text!!!!
			//remember above,that is a mistake that I had made!!!
			msg.setText("the text  content of the e-mail");
		}
		//get the Transport
		Transport trans=session.getTransport("smtp");
		//test the trans is useable
		trans.connect("The Ip Address of the server","sender's name except @ and blow","password");
		//begin to send it
		trans.sendMessage(msg,msg.getAllRecipients());
		//and do not to forget to close it
		trans.close();
	}catch(Exception e){}
	-->
	以上就是怎样去发送一封邮件(包含附件),接下来就是将 怎样去接收邮件
	<!--一下代码可以写在任意位置,这里是在mian函数中演示的
		public static void main(String[] args){
			//get instance of Properties
			Properties props = new Properties();		
			//set values
			props.put("mail.smtp.auth", "true");
			//get instance of Session
			Session session = Session.getInstance(props);		
			try {
				//The Store is used to store all the message
				Store store = session.getStore("pop3");
				//connect server
				store.connect("localhost", "test", "j7student");
				//get the Folder
				Folder fd = store.getFolder("INBOX");
				//open it and the message only can be read
				fd.open(Folder.READ_ONLY);
				//now you get all the message do whatever you want!
				Message ms[] = fd.getMessages(); 
				//do not colse it manul
				fd.close(false);
				//close the store
				store.close();
			} catch (Exception e) {}
		}
	-->

<!--
Author:Lovingshu's Forever
Date:2011.09.22
Remark:Today I send ten thousand e-mails pass Through the server and the server is broken~
		haha~and the computer of my classmates is shocked~haha ~It is funny humm~
-->