使用Java发送带附件的附件的示例

这里使用的是JavaMail技术，前台使用了fckeditor做邮件美化，由于只是示例，后台发送时只是将邮件保存在本地，但是可以查看，如果需要实际发送，请参考我的其他博客文章，我写了很多关于邮件发送的示例！

JSP页面页面除了引用fckeditor外，要注意我们是需要发送附件的：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">
  <title>发送邮件</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">
  <script type="text/javascript" src="fckeditor/fckeditor.js"></script>
  <script type="text/javascript">
  window.onload=function(){
    var oFCKeditor = new FCKeditor( 'content' ) ;
    //编译器基本路径
    oFCKeditor.BasePath = "/pro_04/fckeditor/";
    //高度
    oFCKeditor.Width=800;
    //宽度
    oFCKeditor.Height=300;
    //工具条集合名称(Default,Basic或自己制定，关于ＦＣＫ的使用，博客内有专门文章)
    //具体的配置可以将默认显示出来然后到FCK目录里的fckconfig.js里
    //FCKConfig.ToolbarSets["Default"]数组中去除不要的功能一共63个功能属性
    //oFCKeditor.ToolbarSet="Basic";
    oFCKeditor.ReplaceTextarea() ;
  }
  </script>
 </head>
 <body>
  <!-- 注意表单格式，这里需要上传附件 -->
  <form action="SendMailServlet" method="post" enctype="multipart/form-data">
  <table>
    <tr>
      <td>收件人：</td>
       <td><input type="text" name="to" /></td>
    </tr>
    <tr>
      <td>抄送：</td>
       <td><input type="text" name="copy" /></td>
    </tr>
    <tr>
      <td>主题：</td>
       <td><input type="text" name="title" /></td>
    </tr>
    <tr>
      <td>信件内容：</td>
      <td><textarea rows="10" cols="20" name="content" id="content"></textarea></td>
    </tr>
    <tr>
      <td>附件：</td>
      <td><input type='file' name='ufile' /></td>
    </tr>
    <tr>
      <td>背景音乐：</td>
      <td><input type='file' name='umusic' /></td>
    </tr>
    <tr>
      <td>背景图片：</td><!-- 背景图片我们后台自己准备 -->
      <td>
        <select name="bgimg">
          <option value="1">一号</option>
          <option value="2">二号</option>
        </select>
      </td>
    </tr>
    <tr align="right">
      <td colspan="2"><input type="submit" value="发 送"></td>
    </tr>
  </table>
  </form>
 </body>
</html>

为了防止乱码，会经过一个过滤器：

package org.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
 * 过滤器防止乱码
 * @说明
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
public class EncodingFilter implements Filter {
  public void destroy() {
  }
  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain chain) throws IOException, ServletException {
    request.setCharacterEncoding("UTF-8");
    response.setCharacterEncoding("UTF-8");
    chain.doFilter(request, response);
  }
  public void init(FilterConfig arg0) throws ServletException {
  }
}

然后到Servlet处理附件和信息，这里就不做异常处理了，出错直接报错：

package org.servlet;
import java.io.*;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.entity.MailModel;
import org.mail.SendMail;
/**
 * 接收表单，处理附件，组装邮件对象，并调用发送接口
 * @说明 在C盘创建临时文件
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
@SuppressWarnings("serial")
public class SendMailServlet extends HttpServlet {
  @SuppressWarnings( { "unchecked", "deprecation" })
  @Override
  protected void service(HttpServletRequest request,
      HttpServletResponse response) throws ServletException, IOException {
    // 建立磁盘工厂
    FileItemFactory factory = new DiskFileItemFactory();
    // 表单域
    ServletFileUpload upload = new ServletFileUpload(factory);
    List<FileItem> items = null;
    String bgimg = "1"; // 默认是第一个背景图片
    try {
      items = upload.parseRequest(request);
    } catch (FileUploadException e) {
      e.printStackTrace();
    }
    MailModel mail = new MailModel();
    InputStream is = null;
    for (FileItem item : items) {
      if (!item.isFormField()) { // 如果是附件
        if (item.getSize() > 0) {
          is = item.getInputStream();
          String filename = "";
          if (item.getName().indexOf("\\") == -1) {
            filename = "c:\\tmp\\" + item.getName();
          } else {
            filename = "c:\\tmp\\" + item.getName().substring(item.getName().lastIndexOf("\\"));
          }
          if (is.markSupported()) {
            System.out.println("没有上传文件或文件已经删除");
          } else {
            File file = new File(filename);
            FileOutputStream fos = new FileOutputStream(file); // 建立输出流
            byte[] buffer = new byte[8192]; // 每次读8K字节，大文件上传没有问题
            int count = 0;
            while ((count = is.read(buffer)) > 0) { // 循环写入到硬盘
              fos.write(buffer, 0, count);
            }
            fos.close(); // 关闭输入输出流
            is.close();
            if (item.getFieldName().equals("ufile")) {
              mail.setFilePath(filename);
            } else if (item.getFieldName().equals("umusic")) {
              mail.setMusicPath(filename);
            }
          }
        }
      } else { // 处理文本信息
        if (item.getFieldName().equals("title")) {
          mail.setTitle(item.getString("UTF-8"));
        } else if (item.getFieldName().equals("content")) {
          mail.setContext(item.getString("UTF-8"));
        } else if (item.getFieldName().equals("to")) {
          mail.setTo(item.getString("UTF-8"));
        } else if (item.getFieldName().equals("copy")) {
          mail.setCopy(item.getString("UTF-8"));
        } else if (item.getFieldName().equals("bgimg")) {
          bgimg = item.getString("UTF-8");
        }
      }
    }
    String bgPath = request.getRealPath("/") + "\\images\\bg" + bgimg + ".jpg";
    mail.setBgPath(bgPath);
    try {
      SendMail.sendMail(mail);
    } catch (Exception e) {
      e.printStackTrace();
    }
    response.sendRedirect(request.getContextPath() + "/sendmail.jsp");
  }
}

这里也没有验证，接收到信息后组装一个邮件实体对象，传递到发送接口中发送：
实体，我就不写ｇｅｔ和ｓｅｔ方法了：

package org.entity;
/**
 * 一封邮件的对象
 * @说明
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
public class MailModel {
  /**
   * 主键
   */
  private int id; 

  /**
   * 邮件标题
   */
  private String title; 

  /**
   * 发送给谁
   */
  private String to; 

  /**
   * 背景图片地址
   */
  private String bgPath; 

  /**
   * 抄送给谁
   */
  private String copy; 

  /**
   * 邮件内容
   */
  private String context; 

  /**
   * 附件地址
   */
  private String filePath;
  /**
   * 背景音乐地址
   */
  private String musicPath;
}

然后我们来看看核心处理类：

package org.mail;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Date;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import org.entity.MailModel;
/**
 * 发送一封邮件
 * @说明 注意这里并没有实际发送而是保存在了C盘临时文件中，真是发送的话，请参考我的博客
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
public class SendMail {
  public static void sendMail(MailModel mail) throws Exception {
    Properties props = new Properties();
    props.put("mail.smtp.auth", "true");
    Session session = Session.getInstance(props);
    Message message = new MimeMessage(session);
    InternetAddress from = new InternetAddress();
    from.setPersonal(MimeUtility.encodeText("风中落叶<cuisuqiang@163.com>"));
    message.setFrom(from);
    InternetAddress to = new InternetAddress(mail.getTo());
    message.setRecipient(Message.RecipientType.TO, to);
    // 是否抄送
    if (null != mail.getCopy() && !"".equals(mail.getCopy())) {
      InternetAddress copy = new InternetAddress(mail.getCopy());
      message.setRecipient(Message.RecipientType.CC, copy);
    }
    message.setSubject(MimeUtility.encodeText(mail.getTitle()));
    message.setSentDate(new Date());
    // 指定为混合关系
    MimeMultipart msgMultipart = new MimeMultipart("mixed");
    message.setContent(msgMultipart);
    MimeBodyPart content = new MimeBodyPart();
    msgMultipart.addBodyPart(content);
    // 依赖关系
    MimeMultipart bodyMultipart = new MimeMultipart("related");
    content.setContent(bodyMultipart);
    MimeBodyPart htmlPart = new MimeBodyPart();
    // 组装的顺序非常重要
    bodyMultipart.addBodyPart(htmlPart);
    MimeBodyPart in_bg = new MimeBodyPart();
    bodyMultipart.addBodyPart(in_bg); 

    DataSource bgsou = new FileDataSource(mail.getBgPath());
    DataHandler bghd = new DataHandler(bgsou);
    in_bg.setDataHandler(bghd);
    in_bg.setHeader("Content-Location", "bg.jpg");
    // 是否使用了背景音乐
    if (null == mail.getMusicPath() || "".equals(mail.getMusicPath())) {
      String start = "<html><body background='bg.jpg'>";
      String end = "</body></html>";
      htmlPart.setContent(start + mail.getContext() + end,"text/html;charset=UTF-8");
    } else {
      MimeBodyPart in_Part = new MimeBodyPart();
      bodyMultipart.addBodyPart(in_Part);
      DataSource gifds = new FileDataSource(mail.getMusicPath());
      DataHandler gifdh = new DataHandler(gifds);
      in_Part.setDataHandler(gifdh);
      in_Part.setHeader("Content-Location", "bg.mp3");
      String start = "<html><head><bgsound src='bg.mp3' loop='-1'></head><body background='bg.jpg'>";
      String end = "</body></html>";
      htmlPart.setContent(start + mail.getContext() + end,"text/html;charset=UTF-8");
    }
    // 组装附件
    if (null != mail.getFilePath() && !"".equals(mail.getFilePath())) {
      MimeBodyPart file = new MimeBodyPart();
      FileDataSource file_datasource = new FileDataSource(mail
          .getFilePath());
      DataHandler dh = new DataHandler(file_datasource);
      file.setDataHandler(dh);
      file.setFileName(MimeUtility.encodeText(dh.getName()));
      msgMultipart.addBodyPart(file);
    }
    message.saveChanges();
    // 保存邮件
    OutputStream ips = new FileOutputStream("C:\\tmp\\test.eml");
    message.writeTo(ips);
    ips.close();
    System.out.println("------------发送完毕------------");
    // 删除临时文件
    if (null != mail.getMusicPath() && !"".equals(mail.getMusicPath())) {
      File file = new File(mail.getMusicPath());
      file.delete();
    }
    if (null != mail.getFilePath() && !"".equals(mail.getFilePath())) {
      File file = new File(mail.getFilePath());
      file.delete();
    }
  }
}

我们把邮件发送了C盘，可以到C盘查看，如果需要实际发送，可以参考我的其他博客，有专门说明！