java邮件开发--心得6-web email的编写

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1. 前面讲了好多客户端的电子邮件，实际情况下实际应用价值比较小的，实际生活中用的最多的是网页上的发送email功能，这里比如一个web应用中带有邮件发送功能。

2.下面介绍一个web email使用comcast自带的JNDI的案例及其分析：

package com.web.servlet;
import java.io.IOException;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*用一个content.xml配置文件来编写一个web email
* */
public class SendMailServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
Context context = (Context)new InitialContext().lookup("java:comp/env");
Session session = (Session)context.lookup("mail/context");
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("itcast_test@sina.com"));
InternetAddress[] to = {new InternetAddress("itcast_test@sina.com")};
msg.setRecipients(Message.RecipientType.TO,to);
msg.setSubject("web email");
msg.setText("这是一封 java web写的email");
Transport transport = session.getTransport();
transport.connect("itcast_test","123456");
transport.sendMessage(msg,to);
transport.close();
response.getWriter().println("send ok!");
} catch (Exception e) {
e.printStackTrace(response.getWriter());
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
The resources defined in these elements may be referenced by the following elements in the web application deployment descriptor (/WEB-INF/web.xml) of your web application;重要的配置文件context.xml,该文件放在WEB-INF下的META-INF下，里面的具体如下：
<Context>
<Resource name="mail/context" auth="Container"
type="javax.mail.Session"
mail.smtp.host="smtp.sina.com" 
mail.smtp.auth="true"
mail.transport.protocol="smtp"
/>
</Context>