JavaMail是由Sun到Java開發人員提供的一個開放源代碼類庫，用于發送和接收郵件，支持通用郵件協議，本文是詳解struts2集成javamail發郵件示例，希望對你學習這方面知識有幫助！
一、代碼預覽
這兩天在做struts2上的郵件發送。以前的項目有用到spring，用spring提供的郵件支持類很方便可以完成這個功能，但是現在只用struts2的話，就碰到了一系列的問題。
請先將自己下載的 mail.jar，及activation.jar加入到classpath
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復制代碼 代碼如下:
package com.nerve.cloudoffice.common.util;
import java.util.List;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
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;
public class EMailSender {
?????/**
?????* 向用戶發送郵件
?????*/
????private static final long serialVersionUID = 1L;
????private MimeMessage mimeMsg; // MIME郵件對象
????private Session session; // 郵件會話對象
????private Properties props; // 系統屬性
????private boolean needAuth = false; // smtp是否需要認證
????private String username = ""; // smtp認證用戶名和密碼
????private String password = "";
????private Multipart mp; // Multipart對象,郵件內容,標題,附件等內容均添加到其中后再生成
????private String log;
????public EMailSender() {
????}
????public EMailSender(String smtp) {
????????setSmtpHost(smtp);
????????createMimeMessage();
????}
????public void setSmtpHost(String hostName) {
????????System.out.println("設置系統屬性：mail.smtp.host = " + hostName);
????????if (props == null)
????????????props = System.getProperties(); // 獲得系統屬性對象
????????props.put("mail.smtp.host", hostName); // 設置SMTP主機
????????props.put("mail.smtp.localhost", "localHostAdress");
????}
????public boolean createMimeMessage() {
????????try {
????????????System.out.println("準備獲取郵件會話對象！");
????????????session = Session.getDefaultInstance(props, null); // 獲得郵件會話對象
????????} catch (Exception e) {
????????????log = "獲取郵件會話對象時發生錯誤！" + e.toString();
????????????System.err.println(log);
????????????return false;
????????}
????????try {
????????????mimeMsg = new MimeMessage(session); // 創建MIME郵件對象
????????????mp = new MimeMultipart(); // mp 一個multipart對象
????????????// Multipart is a container that holds multiple body parts.
????????????return true;
????????} catch (Exception e) {
????????????log = "創建MIME郵件對象失敗！" + e;
????????????System.err.println(log);
????????????return false;
????????}
????}
????public void setNeedAuth(boolean need) {
????????System.out.println("設置smtp身份認證：mail.smtp.auth = " + need);
????????if (props == null)
????????????props = System.getProperties();
????????if (need) {
????????????props.put("mail.smtp.auth", "true");
????????} else {
????????????props.put("mail.smtp.auth", "false");
????????}
????}
????public void setNamePass(String name, String pass) {
????????System.out.println("程序得到用戶名與密碼");
????????username = name;
????????password = pass;
????}
????public boolean setSubject(String mailSubject) {
????????System.out.println("設置郵件主題！");
????????try {
????????????mimeMsg.setSubject(MimeUtility.encodeText(mailSubject,"utf-8","B"));
????????????return true;
????????} catch (Exception e) {
????????????log = "設置郵件主題發生錯誤！"+e;
????????????System.err.println(log);
????????????return false;
????????}
????}
????public boolean setBody(String mailBody) {
????????try {
????????????System.out.println("設置郵件體格式");
????????????BodyPart bp = new MimeBodyPart();
????????????// 轉換成中文格式
????????????bp.setContent(
????????????????????"<meta http-equiv=Content-Type content=text/html; charset=utf-8>"
????????????????????????????+ mailBody, "text/html;charset=utf-8");
????????????mp.addBodyPart(bp);
????????????return true;
????????} catch (Exception e) {
????????????log = "設置郵件正文時發生錯誤！" + e;
????????????System.err.println(log);
????????????return false;
????????}
????}
????public boolean setFiles(List<String> files){
????????try{
????????????for(String s:files){
????????????????MimeBodyPart mbp=new MimeBodyPart();?
????????????????FileDataSource fds=new FileDataSource(s); //得到數據源?
????????????????mbp.setDataHandler(new DataHandler(fds)); //得到附件本身并至入BodyPart?
????????????????mbp.setFileName(fds.getName());? //得到文件名同樣至入BodyPart?
????????????????mp.addBodyPart(mbp);
????????????}
????????????return true;
????????}catch(Exception e){
????????????log = "增加附件時出錯："+e;
????????????e.printStackTrace();
????????????return false;
????????}
????}
????public boolean addFile(String path, String name){
????????try{
????????????MimeBodyPart mbp=new MimeBodyPart();?
????????????FileDataSource fds=new FileDataSource(path); //得到數據源?
????????????mbp.setDataHandler(new DataHandler(fds)); //得到附件本身并至入BodyPart?
????????????mbp.setFileName(MimeUtility.encodeText(name,"utf-8","B"));
????????????mp.addBodyPart(mbp);
????????????return true;
????????}catch(Exception e){
????????????log = "增加附件時出錯："+e;
????????????e.printStackTrace();
????????????return false;
????????}
????}
????public boolean setFrom(String from) {
????????System.out.println("設置發信人！");
????????try {
????????????mimeMsg.setFrom(new InternetAddress(from)); // 設置發信人
????????????return true;
????????} catch (Exception e) {
????????????log = "設置發信人出錯:"+e;
????????????return false;
????????}
????}
????public boolean setTo(String to) {
????????System.out.println("設置收信人");
????????if (to == null)
????????????return false;
????????try {
????????????mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress
????????????????????.parse(to));
????????????return true;
????????} catch (Exception e) {
????????????return false;
????????}
????}
????public boolean setCopyTo(String copyto) {
????????if (copyto == null)
????????????return false;
????????try {
????????????mimeMsg.setRecipients(Message.RecipientType.CC,
????????????????????(Address[]) InternetAddress.parse(copyto));
????????????return true;
????????} catch (Exception e) {
????????????return false;
????????}
????}
????public boolean sendout() {
????????try {
????????????mimeMsg.setContent(mp);
????????????mimeMsg.saveChanges();
????????????System.out.println("正在發送郵件....");
????????????Session mailSession = Session.getInstance(props, null);
????????????Transport transport = mailSession.getTransport("smtp");
????????????transport.connect((String) props.get("mail.smtp.host"), username,
????????????????????password);
????????????transport.sendMessage(mimeMsg, mimeMsg
????????????????????.getRecipients(Message.RecipientType.TO));
????????????// transport.send(mimeMsg);
????????????System.out.println("發送郵件成功！");
????????????transport.close();
????????????return true;
????????} catch (Exception e) {
????????????log = "郵件發送失敗！" + e;
????????????System.err.println(log);
????????????return false;
????????}
????}
????public String getLog(){
????????return log;
????}
}
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二、問題總結
2.1? 本地執行時報錯
我用的是javaee 5，jdk1.6，在本地跑時，會出現ClassNotFound的Exception，但是這些類在mail.jar里面又是有的。這個原因是因為我們自己增加的jar包里面的類跟javaee5里面的沖突了，我推薦的解決方法是將javaee5里面的 activation包跟mail包刪除。
做法如下：
找到eclipse引用的javaee5包，用rar軟件打開，找到activation跟mail包，刪除保存就可以了。（記得在ide中刷新一下引用包）
2.2 javax.mail.MessagingException: 501 Syntax: HELO hostname
在本地測試通過后，我部署到linux服務器中，但是去碰到了javax.mail.MessagingException: 501 Syntax: HELO hostname異常， google了發現是以下原因：
Javamail 在提取本地 hostname 的時候會 dig 改 hostname ，然后以改 ip 發送郵件。
由于 hostname 對應的 ip 地址， linux 無法解析（如果是 windows 則無這個問題， windows 利用 netbios 協議去獲得該主機的 ip 地址）到本機 hostname 的 ip ，導致 javamail 無法調用發送 ip 。 Postfix 收到此類郵件將拒絕投遞，而產生 501 錯誤。
網上說可以通過修改服務器的hosts文件解決，但是我發現還可以直接在代碼里面解決（只需要加一行代碼，這大大方便啊），即在setSmtpHost()方法中，增加下面一行：
復制代碼 代碼如下:
props.put("mail.smtp.localhost", "localHostAdress");
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2.3 附件中文名亂碼
如果附件有中文名，直接setName（）會亂碼，通過下面的方法可以解決：
復制代碼 代碼如下:
mbp.setFileName(MimeUtility.encodeText(name,"utf-8","B"));
以上就是今天要給大家分享的關于詳解struts2集成javamail發郵件示例，希望大家看完后都有自己做法，想要找到更好的技術知識，錯新技術頻道就是一個很好的選擇。
