【IT168 技术文档】
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。
1 private byte[] getImageBytes(String file) { 2 byte[] myData = null; 3 InputStream input = getClass().getClassLoader().getResourceAsStream( 4 file); 5 try { 6 ByteArrayOutputStream byteArray = new ByteArrayOutputStream(); 7 int ch = 0; 8 while ((ch = input.read()) != -1) { 9 byteArray.write(ch); 10 } 11 // System.out.println(byteArray.size()); 12 myData = byteArray.toByteArray(); 13 // System.out.println(myData.length); 14 } catch (Exception e) { 15 e.printStackTrace(); 16 } 17 return myData; 18 }
2，发送邮件的“机关”
1 MimeMessage msg = new MimeMessage(mailSession);
2 msg.setFrom(new InternetAddress(this.getSenderAddress()));
3 msg.setSubject(this.getTitle());
4 msg.setSentDate(new Date());
5 Address[] adds = InternetAddress.parse(getToAddress());
6 msg.addRecipients(javax.mail.Message.RecipientType.TO, adds);
7 // 新建一个MimeMultipart对象用来存放BodyPart对象(事实上可以存放多个)
8 MimeMultipart mm = new MimeMultipart("related");
9 // 新建一个存放信件内容的BodyPart对象
10 BodyPart mdp = new MimeBodyPart();
11 // 给BodyPart对象设置内容和格式/编码方式
12 mdp.setContent(this.getContent(), "text/html;charset=utf-8");
13 // 这句很重要，千万不要忘了
14 mm.addBodyPart(mdp);
15
16 // －－－－－－－－－图片处理开始！！！！！！！！！！！！！！！！
17 mdp = new MimeBodyPart();
18 byte bbb[] = new byte[1024 * 10];
19 this.getClass().getClassLoader().getResourceAsStream("notice.jpg")
20 .read(bbb);
21 DataHandler dh = new DataHandler(new ByteArrayDataSource(this
22 .getImageBytes("notice.jpg"), "application/octet-stream"));
23 mdp.setDataHandler(dh);
24 // 加上这句将作为附件发送,否则将作为信件的文本内容
25 mdp.setFileName("1.jpg");
26 mdp.setHeader("content-id", "<IMG1>");
27 // 将含有附件的BodyPart加入到MimeMultipart对象中
28 mm.addBodyPart(mdp);
29 // －－－－－－－－－图片处理结束！！！！！！！！！！！！！！！！
30
31 // 把mm作为消息对象的内容
32 msg.setContent(mm);仔细看代码中的注释吧，相信大有帮助。
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!
1import java.io.ByteArrayOutputStream; 2import java.io.File; 3import java.io.FileReader; 4import java.io.IOException; 5import java.io.InputStream; 6import java.util.Date; 7import java.util.HashMap; 8import java.util.Map; 9import java.util.Properties; 10 11import javax.activation.DataHandler; 12import javax.mail.Address; 13import javax.mail.BodyPart; 14import javax.mail.internet.InternetAddress; 15import javax.mail.internet.MimeBodyPart; 16import javax.mail.internet.MimeMessage; 17import javax.mail.internet.MimeMultipart; 18import javax.mail.util.ByteArrayDataSource; 19 20/** *//** 21 * 22 * @author robin 23 * @version $Revision: 1.4 $ 24 */ 25public class SendMailUtil { 26 27 /** *//** 28 * Field mailServerAddress. 29 */ 30 private String mailServerAddress; 31 32 /** *//** 33 * Field user. 34 */ 35 private String user; 36 37 /** *//** 38 * Field password. 39 */ 40 private String password; 41 42 /** *//** 43 * Field toAddress. 44 */ 45 private String toAddress; 46 47 /** *//** 48 * Field ccAddress. 49 */ 50 private String ccAddress; 51 52 /** *//** 53 * Field title. 54 */ 55 private String title; 56 57 /** *//** 58 * Field content. 59 */ 60 private String content; 61 62 /** *//** 63 * Field isHtml. 64 */ 65 private boolean isHtml = true; 66 67 /** *//** 68 * Field attachmentFiles. 69 */ 70 private Map attachmentFiles = null; 71 72 /** *//** 73 * Field senereAddress. 74 */ 75 private String senderAddress; 76 77 private byte[] getImageBytes(String file) { 78 byte[] myData = null; 79 InputStream input = getClass().getClassLoader().getResourceAsStream( 80 file); 81 try { 82 ByteArrayOutputStream byteArray = new ByteArrayOutputStream(); 83 int ch = 0; 84 while ((ch = input.read()) != -1) { 85 byteArray.write(ch); 86 } 87 // System.out.println(byteArray.size()); 88 myData = byteArray.toByteArray(); 89 // System.out.println(myData.length); 90 } catch (Exception e) { 91 e.printStackTrace(); 92 } 93 return myData; 94 } 95 96 public void sendMail() throws Exception { 97 Properties pos = new Properties(); 98 pos.put("mail.smtp.host", "10.5.1.1"); 99 javax.mail.Session mailSession = javax.mail.Session.getInstance(pos, 100 null); 101 MimeMessage msg = new MimeMessage(mailSession); 102 msg.setFrom(new InternetAddress(this.getSenderAddress())); 103 msg.setSubject(this.getTitle()); 104 msg.setSentDate(new Date()); 105 Address[] adds = InternetAddress.parse(getToAddress()); 106 msg.addRecipients(javax.mail.Message.RecipientType.TO, adds); 107 // 新建一个MimeMultipart对象用来存放BodyPart对象(事实上可以存放多个) 108 MimeMultipart mm = new MimeMultipart("related"); 109 // 新建一个存放信件内容的BodyPart对象 110 BodyPart mdp = new MimeBodyPart(); 111 // 给BodyPart对象设置内容和格式/编码方式 112 mdp.setContent(this.getContent(), "text/html;charset=utf-8"); 113 // 这句很重要，千万不要忘了 114 mm.addBodyPart(mdp); 115 116 // －－－－－－－－－图片处理开始！！！！！！！！！！！！！！！！ 117 mdp = new MimeBodyPart(); 118 byte bbb[] = new byte[1024 * 10]; 119 this.getClass().getClassLoader().getResourceAsStream("notice.jpg") 120 .read(bbb); 121 DataHandler dh = new DataHandler(new ByteArrayDataSource(this 122 .getImageBytes("notice.jpg"), "application/octet-stream")); 123 mdp.setDataHandler(dh); 124 // 加上这句将作为附件发送,否则将作为信件的文本内容 125 mdp.setFileName("1.jpg"); 126 mdp.setHeader("content-id", "<IMG1>"); 127 // 将含有附件的BodyPart加入到MimeMultipart对象中 128 mm.addBodyPart(mdp); 129 // －－－－－－－－－图片处理结束！！！！！！！！！！！！！！！！ 130 131 // 把mm作为消息对象的内容 132 msg.setContent(mm); 133 msg.saveChanges(); 134 javax.mail.Transport transport = mailSession.getTransport("smtp"); 135 transport.connect(); 136 transport.sendMessage(msg, msg.getAllRecipients()); 137 transport.close(); 138 139 } 140 141 /** *//** 142 * Method getCcAddress. 143 * 144 * @return String 145 */ 146 public String getCcAddress() { 147 return ccAddress; 148 } 149 150 /** *//** 151 * Method getContent. 152 * 153 * @return String 154 */ 155 public String getContent() { 156 if (content == null) { 157 return ""; 158 } else { 159 return content; 160 } 161 } 162 163 /** *//** 164 * Method getMailServerAddress. 165 * 166 * @return String 167 */ 168 public String getMailServerAddress() { 169 return "10.5.1.1"; 170 } 171 172 /** *//** 173 * Method getSenderId. 174 * 175 * @return String 176 */ 177 public String getUser() { 178 if (user == null || user.equals("")) { 179 user = ""; 180 } 181 return user; 182 } 183 184 /** *//** 185 * Method getPassword. 186 * 187 * @return String 188 */ 189 public String getPassword() { 190 if (password == null || password.equals("")) { 191 password = ""; 192 } 193 return password; 194 } 195 196 /** *//** 197 * Method getTitle. 198 * 199 * @return String 200 */ 201 public String getTitle() { 202 if (title == null) { 203 return ""; 204 } else { 205 return title; 206 } 207 } 208 209 /** *//** 210 * Method getToAddress. 211 * 212 * @return String 213 */ 214 public String getToAddress() { 215 return toAddress; 216 } 217 218 /** *//** 219 * Method isHtml. 220 * 221 * @return boolean 222 */ 223 public boolean isHtml() { 224 return isHtml; 225 } 226 227 /** *//** 228 * Method setCcAddress. 229 * 230 * @param ccAddress 231 * String 232 */ 233 public void setCcAddress(String ccAddress) { 234 this.ccAddress = ccAddress; 235 } 236 237 /** *//** 238 * Method setContent. 239 * 240 * @param content 241 * String 242 */ 243 public void setContent(String content) { 244 this.content = content; 245 } 246 247 /** *//** 248 * Method setMailServerAddress. 249 * 250 * @param mailServerAddress 251 * String 252 */ 253 public void setMailServerAddress(String mailServerAddress) { 254 this.mailServerAddress = mailServerAddress; 255 } 256 257 /** *//** 258 * Method setUser. 259 * 260 * @param user 261 * String 262 */ 263 public void setUser(String user) { 264 this.user = user; 265 } 266 267 /** *//** 268 * Method setSenderPassword. 269 * 270 * @param password 271 * String 272 */ 273 public void setPassword(String password) { 274 this.password = password; 275 } 276 277 /** *//** 278 * Method setTitle. 279 * 280 * @param title 281 * String 282 */ 283 public void setTitle(String title) { 284 this.title = title; 285 } 286 287 /** *//** 288 * Method setToAddress. 289 * 290 * @param toAddress 291 * String 292 */ 293 public void setToAddress(String toAddress) { 294 this.toAddress = toAddress; 295 } 296 297 /** *//** 298 * Method setIsHtml. 299 * 300 * @param isHtml 301 * boolean 302 */ 303 public void setIsHtml(boolean isHtml) { 304 this.isHtml = isHtml; 305 } 306 307 /** *//** 308 * Method setAttachmentFiles. 309 * 310 * @param attachmentFiles 311 * Map 312 */ 313 public void setAttachmentFiles(Map attachmentFiles) { 314 this.attachmentFiles = attachmentFiles; 315 } 316 317 /** *//** 318 * Method getAttachmentFiles. 319 * 320 * @return Map 321 */ 322 public Map getAttachmentFiles() { 323 return attachmentFiles; 324 } 325 326 /** *//** 327 * Method setHtml. 328 * 329 * @param isHtml 330 * boolean 331 */ 332 public void setHtml(boolean isHtml) { 333 this.isHtml = isHtml; 334 } 335 336 /** *//** 337 * Method getSenderAddress. 338 * 339 * @return String 340 */ 341 public String getSenderAddress() { 342 return senderAddress; 343 } 344 345 /** *//** 346 * Method setSenderAddress. 347 * 348 * @param senderAddress 349 * String 350 */ 351 public void setSenderAddress(String senderAddress) { 352 this.senderAddress = senderAddress; 353 } 354 355 public String readMailTemplate(String year, String season) 356 throws IOException { 357 ClassLoader loder = this.getClass().getClassLoader(); 358 InputStream is = loder.getResourceAsStream("t.html"); 359 byte[] buf = new byte[1024 * 5]; 360 is.read(buf); 361 String t = new String(buf, "utf-8"); 362 t = t.replaceFirst("#year", year); 363 t = t.replaceFirst("#season", season); 364 // System.out.println(t); 365 return t; 366 } 367 368 public static void sendNoticeMail(String title, String year, String season, 369 String sender, File f) { 370 SendMailUtil logic = new SendMailUtil(); 371 try { 372 logic.setTitle(title); 373 // logic.setMailServerAddress("10.5.1.1"); 374 String temp = logic.readMailTemplate(year, season); 375 logic.setSenderAddress(sender); 376 FileReader fr = new FileReader(f); 377 378 char[] ch = new char[new Long(f.length()).intValue()]; 379 fr.read(ch); 380 StringBuffer sb = new StringBuffer(new Long(f.length()).intValue()); 381 for (int i = 0; i < ch.length; i++) { 382 sb.append(ch[i]); 383 } 384 String[] all = sb.toString().split("\n"); 385 386 // System.out.println(sb.toString()); 387 for (int i = 0; i < all.length; i++) { 388 if (all[i].equals("")) { 389 continue; 390 } 391 String t = temp; 392 String[] item = all[i].split(","); 393 logic.setToAddress(item[2]); 394 // 处理内容 395 t = t.replaceFirst("#name", item[1] + "(" + item[0] + ")"); 396 t = t.replaceAll("#total", item[3]); 397 t = t.replaceFirst("#tax", item[4]); 398 t = t.replaceFirst("#actualTotal", item[5]); 399 logic.setContent(t); 400 logic.sendMail(); 401 } 402 } catch (Exception e) { 403 e.printStackTrace(); 404 } 405 } 406}
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。
