本文实例讲述了java中javamail发送带附件的邮件实现方法。分享给大家供大家参考。具体分析如下：
JavaMail，顾名思义，提供给开发者处理电子邮件相关的编程接口。它是Sun发布的用来处理email的API。它可以方便地执行一些常用的邮件传输,JavaMail是可选包,因此如果需要使用的话你需要首先从java官网上下载。目前最新版本是JavaMail1.5.0,下面我们来看看javamail发送带附件的邮件实例
mail.java 代码:
复制代码 代码如下:package mail;
import java.util.* ;
import java.io.* ;
import javax.mail.* ;
import javax.mail.internet.* ;
import javax.activation.* ;
public class Mail {
//定义发件人、收件人、SMTP服务器、用户名、密码、主题、内容等
private String displayName;
private String to;
private String from;
private String smtpServer;
private String username;
private String password;
private String subject;
private String content;
private boolean ifAuth; //服务器是否要身份认证
private String filename="";
private Vector file = new Vector(); //用于保存发送附件的文件名的集合
public void setSmtpServer(String smtpServer){
this.smtpServer=smtpServer;
}
public void setFrom(String from){
this.from=from;
}
public void setDisplayName(String displayName){
this.displayName=displayName;
}
public void setIfAuth(boolean ifAuth){
this.ifAuth=ifAuth;
}
public void setUserName(String username){
this.username=username;
}
public void setPassword(String password){
this.password=password;
}
public void setTo(String to){
this.to=to;
}
public void setSubject(String subject){
this.subject=subject;
}
public void setContent(String content){
this.content=content;
}
public void addAttachfile(String fname){
file.addElement(fname);
}
public Mail(){
}
public Mail(String smtpServer,String from,String displayName,String username,String password,String to,String subject,String content){
this.smtpServer=smtpServer;
this.from=from;
this.displayName=displayName;
this.ifAuth=true;
this.username=username;
this.password=password;
this.to=to;
this.subject=subject;
this.content=content;
}
public Mail(String smtpServer,String from,String displayName,String to,String subject,String content){
this.smtpServer=smtpServer;
this.from=from;
this.displayName=displayName;
this.ifAuth=false;
this.to=to;
this.subject=subject;
this.content=content;
}
public HashMap send(){
HashMap map=new HashMap();
map.put("state", "success");
String message="邮件发送成功！";
Session session=null;
Properties props = System.getProperties();
props.put("mail.smtp.host", smtpServer);
if(ifAuth){ //服务器需要身份认证
props.put("mail.smtp.auth","true");
SmtpAuth smtpAuth=new SmtpAuth(username,password);
session=Session.getDefaultInstance(props, smtpAuth);
}else{
props.put("mail.smtp.auth","false");
session=Session.getDefaultInstance(props, null);
}
session.setDebug(true);
Transport trans = null;
try {
Message msg = new MimeMessage(session);
try{
Address from_address = new InternetAddress(from, displayName);
msg.setFrom(from_address);
}catch(java.io.UnsupportedEncodingException e){
e.printStackTrace();
}
InternetAddress[] address={new InternetAddress(to)};
msg.setRecipients(Message.RecipientType.TO,address);
msg.setSubject(subject);
Multipart mp = new MimeMultipart();
MimeBodyPart mbp = new MimeBodyPart();
mbp.setContent(content.toString(), "text/html;charset=gb2312");
mp.addBodyPart(mbp);
if(!file.isEmpty()){//有附件
Enumeration efile=file.elements();
while(efile.hasMoreElements()){
mbp=new MimeBodyPart();
filename=efile.nextElement().toString(); //选择出每一个附件名
FileDataSource fds=new FileDataSource(filename); //得到数据源
mbp.setDataHandler(new DataHandler(fds)); //得到附件本身并至入BodyPart
mbp.setFileName(fds.getName()); //得到文件名同样至入BodyPart
mp.addBodyPart(mbp);
}
file.removeAllElements();
}
msg.setContent(mp); //Multipart加入到信件
msg.setSentDate(new Date()); //设置信件头的发送日期
//发送信件
msg.saveChanges();
trans = session.getTransport("smtp");
trans.connect(smtpServer, username, password);
trans.sendMessage(msg, msg.getAllRecipients());
trans.close();
}catch(AuthenticationFailedException e){
map.put("state", "failed");
message="邮件发送失败！错误原因：n"+"身份验证错误!";
e.printStackTrace();
}catch (MessagingException e) {
message="邮件发送失败！错误原因：n"+e.getMessage();
map.put("state", "failed");
e.printStackTrace();
Exception ex = null;
if ((ex = e.getNextException()) != null) {
System.out.println(ex.toString());
ex.printStackTrace();
}
}
//System.out.println("n提示信息:"+message);
map.put("message", message);
return map;
}
}
SmtpAuth.java 代码:
复制代码 代码如下:package mail;
public class SmtpAuth extends javax.mail.Authenticator {
private String username,password;
public SmtpAuth(String username,String password){
this.username = username;
this.password = password;
}
protected javax.mail.PasswordAuthentication getPasswordAuthentication() {
return new javax.mail.PasswordAuthentication(username,password);
}
}
存在的问题就是发送到163的邮件全部都带有一个附件的符号，不管有没有发送附件，感兴趣的朋友可以对此加以改进和完善。
希望本文所述对大家的Java程序设计有所帮助。
