用J2ME实现简单电子邮件发送功能(三)

class MailThread extends Thread
{
    private MailClient midlet;

    public MailThread(MailClient midlet)
    {
        this.midlet = midlet;
    }

public void run()
    {
        synchronized(midlet)
        {
            try
            {
                midlet.wait();
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
           
        }
        System.out.println("connecting to server.....");
        HttpConnection httpConn = null;
        DataOutputStream dos = null;
       
        try
        {
            httpConn = (HttpConnection)Connector.open("http://localhost:8088/mail/maildo");
            httpConn.setRequestMethod("POST");
            dos = new DataOutputStream(httpConn.openOutputStream());
            dos.writeUTF(midlet.getMessage().getTo());
            dos.writeUTF(midlet.getMessage().getSubject());
            dos.writeUTF(midlet.getMessage().getContent());
            dos.close();
            httpConn.close();
            System.out.println("end of sending mail");
        }
        catch(IOException e)
        {}
    }}

    在服务器端，我们要完成自己的servlet。他的任务比较简单就是接受客户端的数据然后通过JavaMail发送到指定的收件人那里。如果您对JavaMail还不熟悉请参考如下文章。这里直接给出servlet代码。
使用JavaMail实现收发电子邮件功能
使用Servlet发送电子邮件

package com.j2medev.servletmail;

import java.io.DataInputStream;
import java.io.IOException;
import java.util.Properties;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.*;
import java.net.*;

public class MailServlet extends HttpServlet
{
    private static String host;

    private static String from;

    public void init(ServletConfig config) throws ServletException
    {
        super.init(config);
        host = config.getInitParameter("host");
        from = config.getInitParameter("from");
        System.out.println(host + from);
    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {

        doPost(request, response);
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {
      
        DataInputStream dis = new DataInputStream(request.getInputStream());
        String send = dis.readUTF();
        String subject = dis.readUTF();
        String content = dis.readUTF();
        try
        {
            Properties props = System.getProperties();
            // Setup mail server
            props.put("mail.smtp.host", host);
            // Get session
            Session session = Session.getDefaultInstance(props, null);
            // Define message
            MimeMessage message = new MimeMessage(session);
            // Set the from address
            message.setFrom(new InternetAddress(from));
            // Set the to address
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(
                    send));
            // Set the subject
            message.setSubject(subject);
            // Set the content
            message.setText(content);
            // Send message
            Transport.send(message);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

web.xml
<?xml version="1.0" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
 <servlet>
  <servlet-name>ServletMail</servlet-name>
  <servlet-class>com.j2medev.servletmail.MailServlet</servlet-class>
  <init-param>
   <param-name>host</param-name>
   <param-value>smtp.263.net</param-value>
     </init-param>
     <init-param>
      <param-name>from</param-name>
      <param-value>eric.zhan@263.net</param-value>
     </init-param>
 </servlet>
 
 <servlet-mapping>
  <servlet-name>ServletMail</servlet-name>
  <url-pattern>/maildo</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>

 <error-page>
  <error-code>404</error-code>
  <location>/error.jsp</location>
 </error-page>

</web-app>

    总结：本文更多要介绍的其实还是这个代理的思想，利用所学的知识灵活应用。不要局限于J2ME提供给你的API。文章中实现的客户端服务器都比较简单，也不够友好，如果感兴趣可以稍微修饰一下，对提高能力还是有帮助的。在MIDP中只是提供了RMS作为持久存储用，因此实现接受存储邮件不是很方便。如果手机支持FileConnection的话可以编写一个接受邮件的客户端。

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