spring javamail 来发送动态生成的3D图象(转)_springboot开发实现3d图片效果-优快云博客

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本文介绍使用JavaMail发送包含HTML格式、内嵌图片及中文附件的邮件的方法。通过配置Spring和使用MimeMessageHelper，实现了动态生成3D图表并直接嵌入邮件中，解决了服务器存储压力问题。

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在以前的工作项目中，也接触过javamail来发送简单的邮件，但是最近的一个项目在用javamail来发送html格式的邮件时，却遇到了点小麻烦。因为客户要求要把在后台生成的3D报表图片（用JFreeChart来实现）嵌入到html中。其实发送html格式的邮件倒是没有什么困难，难就难在如何把在服务器端生成的3D图片也发送出去，并且不能把3D的图片存储在server上，因为是Web应用，访问量甚是惊人，如果每个用户都生成几个3D图片，不用很久服务器的存储空间就难以承受了。还好经过我耐心地试验，问题终于得到了圆满解决，在此记录下来，以备不时之需，同时分享给像前几天的我一样被这个问题困扰的同行们。

首先配置spring的xml文件：

<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd" >
< beans >
     < bean id ="mailsender" class ="org.springframework.mail.javamail.JavaMailSenderImpl" >
            < property name ="host" >
             < value > smtp.163.com </ value >
            </ property >
            < property name ="username" >
             < value > youruser </ value >
            </ property >
            < property name ="password" >
             < value > yourpassword </ value >
            </ property >
         < property name ="javaMailProperties" >
             < props >
                  < prop key ="mail.smtp.auth" > true </ prop >
              </ props >
         </ property >
      </ bean >

     < bean id ="mailmessage" class ="org.springframework.mail.SimpleMailMessage" >
            < property name ="to" >
             < value > youruser@163.com </ value >
            </ property >
            < property name ="from" >
             < value > youruser@163.com </ value >
            </ property >
            < property name ="subject" >
             < value > A sample mail </ value >
            </ property >
       </ bean >

</ beans >

邮件工厂，采用工厂模式：

/**

package com.kevin.springmail;

import java.io.File;

import java.io.IOException;

import javax.mail.MessagingException;

import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeUtility;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.log4j.BasicConfigurator;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.core.io.FileSystemResource;

import org.springframework.core.io.UrlResource;

import org.springframework.mail.SimpleMailMessage;

import org.springframework.mail.javamail.JavaMailSenderImpl;

import org.springframework.mail.javamail.MimeMessageHelper;

/**

* @author Administrator

* @date 2006-9-15

* @time 22:16:34

public class MailFactory {

private static final Log logger = LogFactory.getLog(MailFactory.class);

private static final ApplicationContext context;

/**

* 初始化beans

static {

//加载log4j日志记录

BasicConfigurator.configure();

String springbean = "com/kevin/springmail/springmail.xml";

context = new ClassPathXmlApplicationContext(springbean);

logger.info("初始化beans springmail.xml 完成！");

}

/**

* 发送简单的邮件信息，邮件的内容都是纯文本的内容

public static void sendSimpleMessageMail(){

SimpleMailMessage mailmessage = (SimpleMailMessage)context.getBean("mailmessage");

JavaMailSenderImpl mailsender = (JavaMailSenderImpl)context.getBean("mailsender");

mailmessage.setText("你好，Jarry！");

mailsender.send(mailmessage);

logger.info("simple mail has bean sent !");

}

/**

* 发送HTML格式的邮件，HTML格式中带有图片的，

* 图片的来源是Server端的文件系统。（图片就是文件系统的）

* @throws MessagingException

* @throws IOException

public static void sendMimeMessageMail() throws MessagingException, IOException{

JavaMailSenderImpl mailsender = (JavaMailSenderImpl)context.getBean("mailsender");

MimeMessage mimeMessage = mailsender.createMimeMessage();

MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "GB2312");

StringBuffer html = new StringBuffer();

html.append("<html>");

html.append("<head>");

html.append("<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>");

html.append("</head>");

html.append("<body bgcolor='#ccccff'>");

html.append("<center>");

html.append("<h1>你好，Jarry</h1>");

html.append("<img src='cid:img'>");

html.append("<p>logo:");

html.append("<img src='cid:logo'>");

html.append("</center>");

html.append("</body>");

html.append("</html>");

helper.setText(html.toString(), true);

FileSystemResource image = new FileSystemResource(new File("icon.gif"));

helper.addInline("img",image);

FileSystemResource logo = new FileSystemResource(new File("logo.gif"));

helper.addInline("logo",logo);

helper.setFrom("green006@163.com");

helper.setTo("green006@163.com");

helper.setSubject("spring javamail test");

logger.info(mimeMessage.getContentID());

logger.info(mimeMessage.getContent());

mailsender.send(mimeMessage);

logger.info("mime mail has bean sent !");

}

/**

* 发送带动态图象的HTML邮件，所谓动态图象就是在发送邮件时

* 动态地生成一个图片，然后再随HTML格式的邮件发送出去。

* @throws MessagingException

* @throws IOException

public static void sendDynamicImageMail() throws MessagingException, IOException{

JavaMailSenderImpl mailsender = (JavaMailSenderImpl)context.getBean("mailsender");

MimeMessage mimeMessage = mailsender.createMimeMessage();

MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "GB2312");

StringBuffer html = new StringBuffer();

html.append("<html>");

html.append("<head>");

html.append("<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>");

html.append("</head>");

html.append("<body bgcolor='#ccccff'>");

html.append("<center>");

html.append("<h1>你好，Jarry</h1>");

html.append("<img src='cid:png'>");//cid:png中的png就是下面的helper.addInline("png",image);中的png

html.append("</body>");

html.append("</html>");

//设定邮件的正文内容

helper.setText(html.toString(), true);

//new一个UrlResource对象，注意http://localhost:8080/springtiles/makechart.png看起来好像一个png格式的

//图片，其实makechart.png本质上是一个Servlet，在这个Servlet中用JFreeChart构造了一个3D的图象。

UrlResource image = new UrlResource("http://localhost:8080/springtiles/makechart.png");

//把生成的image图象添加到邮件信息中

helper.addInline("png",image);

helper.setFrom("green006@163.com");

helper.setTo("green006@163.com");

helper.setSubject("spring javamail test");

logger.info(mimeMessage.getContentID());

logger.info(mimeMessage.getContent());

mailsender.send(mimeMessage);

logger.info("dynamic image mail has bean sent !");

}

/**

* 发送带附件的电子邮件，包括文件名是中文的。

* （中文比较特殊些，不然会出现乱码）

* @throws MessagingException

* @throws IOException

public static void sendMailWithAttachment() throws MessagingException, IOException{

JavaMailSenderImpl mailsender = (JavaMailSenderImpl)context.getBean("mailsender");

MimeMessage mimeMessage = mailsender.createMimeMessage();

MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "GB2312");

StringBuffer html = new StringBuffer();

html.append("<html>");

html.append("<head>");

html.append("<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>");

html.append("</head>");

html.append("<body bgcolor='#ccccff'>");

html.append("<center>");

html.append("<h1>你好，Jarry</h1>");

html.append("<p>logo:");

html.append("<img src='cid:logo'>");

html.append("</center>");

html.append("</body>");

html.append("</html>");

helper.setText(html.toString(), true);

FileSystemResource logo = new FileSystemResource(new File("logo.gif"));

helper.addInline("logo",logo);

//添加附件

File file = new File("build.xml");

helper.addAttachment("build.xml",file);

//添加中文名的，不做下面的处理会出现乱码的。

String filename = MimeUtility.encodeText(new String("个人助理-公元农历.mht".getBytes(),"GB2312"),"GB2312","B");

File f = new File("个人助理-公元农历.mht");

helper.addAttachment(filename,f);

helper.setFrom("green006@163.com");

helper.setTo("green006@163.com");

helper.setSubject("spring javamail test");

logger.info(mimeMessage.getContentID());

logger.info(mimeMessage.getContent());

mailsender.send(mimeMessage);

logger.info("a mime mail with an attachment has bean sent !");

}

生成3D图象的servlet：

/**

package com.kevin.springmail;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import com.kevin.jfreechart.education.EducationAccount;

/**

* @author Administrator

* @date 2006-9-16

* @time 0:45:47

public class ChartServlet extends HttpServlet {

private final Log logger = LogFactory.getLog(this.getClass());

/**

private static final long serialVersionUID = 1L;

private final String CONTENS_TYPE ="IMAGE/PNG";

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

response.setContentType(CONTENS_TYPE);

//利用JFreeChart构建生成3D的图表

EducationAccount assetBar = new EducationAccount();

assetBar.drawBar3D(response.getOutputStream());

logger.info("完成在servlet中输出image！");

}

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

// TODO Auto-generated method stub

doGet(request,response);

}

简单测试一下：

/**

package com.kevin.springmail;

import java.io.IOException;

import java.net.URISyntaxException;

import javax.mail.MessagingException;

/**

* @author Administrator

* @date 2006-9-15

* @time 22:36:29

public class MailTest {

/**

* @param args

* @throws MessagingException

* @throws IOException

* @throws URISyntaxException

public static void main(String[] args) throws MessagingException, IOException, URISyntaxException {

// TODO Auto-generated method stub

//MailFactory.sendSimpleMessageMail();

//MailFactory.sendMimeMessageMail();

MailFactory.sendMailWithAttachment();

}

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