用Java Mail发送带图片附件

1,读入图片的方式：
发现网上讲的很多读取图片的方式都不对，按下面提供的这个方法来读取，保证成功。

java 代码

private
 
byte
[] getImageBytes(String file) {
    byte
[] myData = 
null
;
    InputStream input = getClass().getClassLoader().getResourceAsStream(file);
    try
 {
        ByteArrayOutputStream byteArray = new
 ByteArrayOutputStream();
        int
 ch = 
0
;
        while
 ((ch = input.read()) != -
1
) {
        byteArray.write(ch);
    }
    // System.out.println(byteArray.size());
    myData = byteArray.toByteArray();
    // System.out.println(myData.length);
    }
    catch
 (Exception e) {
        e.printStackTrace();}
        return
 myData;
    }

2，发送邮件的“机关”

java 代码

MimeMessage msg = 
new
 MimeMessage(mailSession);
msg.setFrom(new
 InternetAddress(
this
.getSenderAddress()));
msg.setSubject(this
.getTitle());
msg.setSentDate(new
 Date());
Address[] adds = InternetAddress.parse(getToAddress());
msg.addRecipients(javax.mail.Message.RecipientType.TO, adds);
// 新建一个MimeMultipart对象用来存放BodyPart对象(事实上可以存放多个)
MimeMultipart mm = new
 MimeMultipart(
"related"
);
// 新建一个存放信件内容的BodyPart对象
BodyPart mdp = new
 MimeBodyPart();
// 给BodyPart对象设置内容和格式/编码方式
mdp.setContent(this
.getContent(), 
"text/html;charset=utf-8"
);
// 这句很重要，千万不要忘了
mm.addBodyPart(mdp);

// －－－－－－－－－图片处理开始！！！！！！！！！！！！！！！！
mdp = new
 MimeBodyPart();
byte
 bbb[] = 
new
 
byte
[
1024
 * 
10
];
this
.getClass().getClassLoader().getResourceAsStream(
"notice.jpg"
).read(bbb);
DataHandler dh = new
 DataHandler(
new
 ByteArrayDataSource(
this
.getImageBytes(
"notice.jpg"
),
"application/octet-stream"
));
mdp.setDataHandler(dh);
// 加上这句将作为附件发送,否则将作为信件的文本内容
mdp.setFileName("1.jpg"
);
mdp.setHeader("content-id"
, 
"<IMG1>"
);
// 将含有附件的BodyPart加入到MimeMultipart对象中
mm.addBodyPart(mdp);

// 把mm作为消息对象的内容
msg.setContent(mm);

3，一个实际应用的完整代码
要求根据一个格式文件和模版，发一封漂亮的邮件，所以需要用到HTML格式来发送邮件。不多说了，看代码吧!

java 代码

import
 java.io.ByteArrayOutputStream;
import
 java.io.File;
import
 java.io.FileReader;
import
 java.io.IOException;
import
 java.io.InputStream;
import
 java.util.Date;
import
 java.util.HashMap;
import
 java.util.Map;
import
 java.util.Properties;
import
 javax.activation.DataHandler;
import
 javax.mail.Address;
import
 javax.mail.BodyPart;
import
 javax.mail.internet.InternetAddress;
import
 javax.mail.internet.MimeBodyPart;
import
 javax.mail.internet.MimeMessage;
import
 javax.mail.internet.MimeMultipart;
import
 javax.mail.util.ByteArrayDataSource;
/** */
/**
*
* @author robin
* @version $Revision: 1.4 $
*/
public
 
class
 SendMailUtil {
    private
 String mailServerAddress;
    private
 String user;
    private
 String password;
    private
 String toAddress;
    private
 String ccAddress;
    private
 String title;
    private
 String content;
    private
 
boolean
 isHtml = 
true
;
    private
 Map attachmentFiles = 
null
;
    private
 String senderAddress;

    private
 
byte
[] getImageBytes(String file) {
        byte
[] myData = 
null
;
        InputStream input = getClass().getClassLoader().getResourceAsStream(file);
        try
 {
            ByteArrayOutputStream byteArray = new
 ByteArrayOutputStream();
            int
 ch = 
0
;
            while
 ((ch = input.read()) != -
1
) {
                byteArray.write(ch);
            }
            // System.out.println(byteArray.size());
            myData = byteArray.toByteArray();
            // System.out.println(myData.length);
        } catch
 (Exception e) {
            e.printStackTrace();
        }
        return
 myData;
    }

    public
 
void
 sendMail() 
throws
 Exception {
        Properties pos = new
 Properties();
        pos.put("mail.smtp.host"
, 
"10.5.1.1"
);
        javax.mail.Session mailSession = javax.mail.Session.getInstance(pos,null
);
        MimeMessage msg = new
 MimeMessage(mailSession);
        msg.setFrom(new
 InternetAddress(
this
.getSenderAddress()));
        msg.setSubject(this
.getTitle());
        msg.setSentDate(new
 Date());
        Address[] adds = InternetAddress.parse(getToAddress());
        msg.addRecipients(javax.mail.Message.RecipientType.TO, adds);
        // 新建一个MimeMultipart对象用来存放BodyPart对象(事实上可以存放多个)
        MimeMultipart mm = new
 MimeMultipart(
"related"
);
        // 新建一个存放信件内容的BodyPart对象
        BodyPart mdp = new
 MimeBodyPart();
        // 给BodyPart对象设置内容和格式/编码方式
        mdp.setContent(this
.getContent(), 
"text/html;charset=utf-8"
);
        // 这句很重要，千万不要忘了
        mm.addBodyPart(mdp);

        // －－－－－－－－－图片处理开始！！！！！！！！！！！！！！！！
        mdp = new
 MimeBodyPart();
        byte
 bbb[] = 
new
 
byte
[
1024
 * 
10
];
        this
.getClass().getClassLoader().getResourceAsStream(
"notice.jpg"
).read(bbb);
        DataHandler dh = new
 DataHandler(
new
 ByteArrayDataSource(
this
.getImageBytes(
"notice.jpg"
), 
"application/octet-stream"
));
        mdp.setDataHandler(dh);
        // 加上这句将作为附件发送,否则将作为信件的文本内容
        mdp.setFileName("1.jpg"
);
        mdp.setHeader("content-id"
, 
"<IMG1>"
);
        // 将含有附件的BodyPart加入到MimeMultipart对象中
        mm.addBodyPart(mdp);
        // －－－－－－－－－图片处理结束！！！！！！！！！！！！！！！！

        // 把mm作为消息对象的内容
        msg.setContent(mm);
        msg.saveChanges();
        javax.mail.Transport transport = mailSession.getTransport("smtp"
);
        transport.connect();
        transport.sendMessage(msg, msg.getAllRecipients());
        transport.close();
    }

    public
 String getCcAddress() {
        return
 ccAddress;
    }

    public
 String getContent() {
        if
 (content == 
null
) {
            return
 
""
;
        } else
 {
            return
 content;
        }
    }

    public
 String getMailServerAddress() {
        return
 
"10.5.1.1"
;
    }

    public
 String getUser() {
        if
 (user == 
null
 || user.equals(
""
)) {
            user = ""
;
        }
        return
 user;
    }

    public
 String getPassword() {
        if
 (password == 
null
 || password.equals(
""
)) {
            password = ""
;
        }
        return
 password;
    }

    public
 String getTitle() {
        if
 (title == 
null
) {
            return
 
""
;
        } else
 {
            return
 title;
        }
    }

    public
 String getToAddress() {
        return
 toAddress;
    }

    public
 
boolean
 isHtml() {
        return
 isHtml;
    }

    public
 
void
 setCcAddress(String ccAddress) {
        this
.ccAddress = ccAddress;
    }

    public
 
void
 setContent(String content) {
        this
.content = content;
    }

    public
 
void
 setMailServerAddress(String mailServerAddress) {
        this
.mailServerAddress = mailServerAddress;
    }

    public
 
void
 setUser(String user) {
        this
.user = user;
    }

    public
 
void
 setPassword(String password) {
        this
.password = password;
    }

    public
 
void
 setTitle(String title) {
        this
.title = title;
    }

    public
 
void
 setToAddress(String toAddress) {
        this
.toAddress = toAddress;
    }

    public
 
void
 setIsHtml(
boolean
 isHtml) {
        this
.isHtml = isHtml;
    }

    public
 
void
 setAttachmentFiles(Map attachmentFiles) {
        this
.attachmentFiles = attachmentFiles;
    }

    public
 Map getAttachmentFiles() {
        return
 attachmentFiles;
    }

    public
 
void
 setHtml(
boolean
 isHtml) {
        this
.isHtml = isHtml;
    }

    public
 String getSenderAddress() {
        return
 senderAddress;
    }

    public
 
void
 setSenderAddress(String senderAddress) {
        this
.senderAddress = senderAddress;
    }

    public
 String readMailTemplate(String year, String season)
throws
 IOException {
        ClassLoader loder = this
.getClass().getClassLoader();
        InputStream is = loder.getResourceAsStream("t.html"
);
        byte
[] buf = 
new
 
byte
[
1024
 * 
5
];
        is.read(buf);
        String t = new
 String(buf, 
"utf-8"
);
        t = t.replaceFirst("#year"
, year);
        t = t.replaceFirst("#season"
, season);
        // System.out.println(t);
        return
 t;
    }

    public
 
static
 
void
 sendNoticeMail(String title, String year, String season,String sender, File f) {
        SendMailUtil logic = new
 SendMailUtil();
        try
 {
            logic.setTitle(title);
            // logic.setMailServerAddress("10.5.1.1");
            String temp = logic.readMailTemplate(year, season);
            logic.setSenderAddress(sender);
            FileReader fr = new
 FileReader(f);

            char
[] ch = 
new
 
char
[
new
 Long(f.length()).intValue()];
            fr.read(ch);
            StringBuffer sb = new
 StringBuffer(
new
 Long(f.length()).intValue());
            for
 (
int
 i = 
0
; i < ch.length; i++) {
                sb.append(ch[i]);
            }
            String[] all = sb.toString().split("\n"
);

            // System.out.println(sb.toString());
            for
 (
int
 i = 
0
; i < all.length; i++) {
                if
 (all[i].equals(
""
)) {
                    continue
;
                }
                String t = temp;
                String[] item = all[i].split(","
);
                logic.setToAddress(item[2
]);
                // 处理内容
                t = t.replaceFirst("#name"
, item[
1
] + 
"("
 + item[
0
] + 
")"
);
                t = t.replaceAll("#total"
, item[
3
]);
                t = t.replaceFirst("#tax"
, item[
4
]);
                t = t.replaceFirst("#actualTotal"
, item[
5
]);
                logic.setContent(t);
                logic.sendMail();
            }
        } catch
 (Exception e) {
            e.printStackTrace();
        }
    }
}

4，小技巧
我第一次发送后，发现读取图片的程序不对，在Outlook 2003中打开邮件，发现没有出现图片，搞半天也不知道是什么原因，后来我用FoxMail打开邮件，发现图片附件上打了个叉叉，才知道是附件中的图片读 取不对，如果你有这样的问题，不妨换个Mail客户端试试。