利用JAVA API发送E-mail

/**
*
* SendMail.java
*/
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.activation.URLDataSource;
import javax.mail.BodyPart;
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;

//import javax.mail.internet.MailDateFormat;

public class SendMail {
public static String TEXT = "text/plain;charset=gb2312";
public static String HTML = "text/html;charset=gb2312";
private String host; //邮件服务器
private String user; //用户名
private String pass;//用户密码
private String from;//发信人
private String to;//收信人
private String cc;//Carbon Copy, 抄送邮件给某人
private String bc;//bcc Blind Carbon Copy,隐蔽副本 隐蔽抄送给某人
private String subject;//邮件主题
private BodyPart body;//邮件内容
private boolean needAuth; //是否需要认证
private List attaches;//邮件附件
/**
* 构造方法
*
*/
public SendMail() {
needAuth = true;
attaches = new ArrayList();
}
/**
* 构造方法
* @param host
*/
public SendMail(String host) {
needAuth = true;
attaches = new ArrayList();
this.host = host;
}
/**
* 构造方法
* @param host
* @param user
* @param pass
*/
public SendMail(String host, String user, String pass) {
needAuth = true;
attaches = new ArrayList();
this.host = host;
this.user = user;
this.pass = pass;
}
//设置邮件服务器是否需要认证
public void setNeedAuth(boolean needAuth) {
this.needAuth = needAuth;
}
public void setFrom(String from) {
this.from = from;
}
public void setTo(String to) {
this.to = to;
}
public String getPass() {
return pass;
}
public String getUser() {
return user;
}
public void setPass(String string) {
pass = string;
}
public void setUser(String string) {
user = string;
}

public String getFrom() {
return from;
}
public String getHost() {
return host;
}
public boolean isNeedAuth() {
return needAuth;
}
public String getSubject() {
return subject;
}
public void setHost(String string) {
host = string;
}
public void setBlindTo(String bc) {
this.bc = bc;
}
public void setCopyTo(String cc) {
this.cc = cc;
}
public void setSubject(String subject) {
this.subject = subject;
}
/**
* 设置邮件内容的形式
* @param string
* @param contentType
*/
public void setBody(String string, String contentType) {
try {
body = new MimeBodyPart();
DataHandler dh = new DataHandler(string, contentType);
body.setDataHandler(dh);
} catch (Exception exception) {
}
}
/**
* 设置邮件的内容的格式为文本格式
* @param string
*/
public void setBodyAsText(String string) {
setBody(string, TEXT);
}
/**
* 以HTMl的形式存放内容
* @param string
*/
public void setBodyAsHTML(String string) {
setBody(string, HTML);
}
/**
* 从文件中自动导入邮件内容
* @param filename
*/
public void setBodyFromFile(String filename) {
try {
BodyPart mdp = new MimeBodyPart();
FileDataSource fds = new FileDataSource(filename);
DataHandler dh = new DataHandler(fds);
mdp.setDataHandler(dh);
attaches.add(mdp);
} catch (Exception exception) {
}
}
/**
* 从一个URL导入邮件的内容
* @param url
*/
public void setBodyFromUrl(String url) {
try {
BodyPart mdp = new MimeBodyPart();
URLDataSource ur = new URLDataSource(new URL(url));
DataHandler dh = new DataHandler(ur);
mdp.setDataHandler(dh);
attaches.add(mdp);
} catch (Exception exception) {
}
}
/**
* 将String中的内容存放入文件showname，并将这个文件作为附件发送给收件人
* @param string 为邮件的内容
* @param showname 显示的文件的名字
*/
public void addAttachFromString(String string, String showname) {
try {
BodyPart mdp = new MimeBodyPart();
DataHandler dh = new DataHandler(string, TEXT);
mdp.setFileName(MimeUtility.encodeWord(showname, "gb2312", null));
mdp.setDataHandler(dh);
attaches.add(mdp);
} catch (Exception exception) {
}
}
/**
* filename为邮件附件
*在收信人的地方以showname这个文件名来显示
* @param filename
* @param showname
*/
public void addAttachFromFile(String filename, String showname) {
try {
BodyPart mdp = new MimeBodyPart();
FileDataSource fds = new FileDataSource(filename);
DataHandler dh = new DataHandler(fds);
mdp.setFileName(MimeUtility.encodeWord(showname, "gb2312", null));
mdp.setDataHandler(dh);
attaches.add(mdp);
} catch (Exception exception) {
}
}
/**
* 将互联网上的一个文件作为附件发送给收信人
* 并在收信人处显示文件的名字为showname
* @param url
* @param showname
*/
public void addAttachFromUrl(String url, String showname) {
try {
BodyPart mdp = new MimeBodyPart();
URLDataSource ur = new URLDataSource(new URL(url));
DataHandler dh = new DataHandler(ur);
mdp.setFileName(MimeUtility.encodeWord(showname, "gb2312", null));
mdp.setDataHandler(dh);
attaches.add(mdp);
} catch (Exception exception) {
}
}
/**
* 发送邮件,需要身份认证
* @throws Exception
*/
public void send() throws Exception {
try {
Properties props = new Properties();
if (host != null && !host.trim().equals(""))
props.put("mail.smtp.host", host);
else
throw new Exception("没有指定发送邮件服务器");
if (needAuth)
props.put("mail.smtp.auth", "true");
Session s = Session.getInstance(props, null);
MimeMessage msg = new MimeMessage(s);
//设置邮件主题
msg.setSubject(subject);
//设置邮件发送时间
msg.setSentDate(new Date());
//制定发件人
if (from != null)
msg.addFrom(InternetAddress.parse(from));
else
throw new Exception("没有指定发件人");
//指定收件人
if (to != null)
msg.addRecipients(javax.mail.Message.RecipientType.TO,
InternetAddress.parse(to));
else
throw new Exception("没有指定收件人地址");
//指定抄送给谁
if (cc != null)
msg.addRecipients(javax.mail.Message.RecipientType.CC,
InternetAddress.parse(cc));
//制定隐藏抄送给谁
if (bc != null)
msg.addRecipients(javax.mail.Message.RecipientType.BCC,
InternetAddress.parse(bc));
Multipart mm = new MimeMultipart();
//设置邮件的附件
if (body != null)
mm.addBodyPart(body);
for (int i = 0; i < attaches.size(); i++) {
BodyPart part = (BodyPart) attaches.get(i);
mm.addBodyPart(part);
}
// 设置邮件的内容
msg.setContent(mm);
//保存所有改变
msg.saveChanges();
//发送邮件服务器（SMTP），简单邮件传输协议
Transport transport = s.getTransport("smtp");
//访问邮件服务器
transport.connect(host, user, pass);
//发送信息
transport.sendMessage(msg, msg.getAllRecipients());
//关闭邮件传输
transport.close();
} catch (Exception e) {
throw new Exception("发送邮件失败:", e);
}
}
}

sendmail.jsp:

<%@ page contentType="text/html;charset=gb2312" language="java" %>
<%@ page import="ten.*,simpleforum.util.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>发送邮件测试</title>
<meta name="copyright" content="邮件发送测试. All rights reserved.">
<meta name="Keywords" content="jsp,servlet,mail">
<meta name="Description" content="发送邮件测试">
<meta http-equiv="content-type" content="text/html; charset=gb2312">
</head>
<body>
<%
String host = ParamUtil.getParameter(request,"host");
String user = ParamUtil.getParameter(request,"user");
String password = ParamUtil.getParameter(request,"password");
String subject = ParamUtil.getParameter(request,"subject");
String to = ParamUtil.getParameter(request,"to");
String from = ParamUtil.getParameter(request,"from");
String bodyashtml = ParamUtil.getParameter(request,"bodyashtml");
String attachfile = ParamUtil.getParameter(request,"attachfile");
out.println("<br>"+host);
out.println("<br>"+user);
//out.println("<br>"+password);
out.println("<br>"+subject);
out.println("<br>"+to);
out.println("<br>"+from);
out.println("<br>"+bodyashtml);
out.println("<br>"+attachfile);
try {
SendMail send = new SendMail();
send.setHost(host);
send.setUser(user);
send.setPass(password);
send.setSubject(subject);
send.setTo(to);
send.setFrom(from);
send.setBodyAsHTML(bodyashtml);
send.addAttachFromFile(attachfile,"aa.txt");
send.send();
out.println("<br>邮件发送成功！！！");
} catch (Exception e) {
out.println("<br>"+e.getMessage());
out.println("<br>邮件发送失败！！！");
}
%>
</body>
</html>

testmail.jsp:

<%@ page contentType="text/html;charset=gb2312" language="java" %>
<%@ page import="ten.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>发送邮件测试</title>
<meta name="copyright" content="邮件发送测试. All rights reserved.">
<meta name="Keywords" content="jsp,servlet,mail">
<meta name="Description" content="发送邮件测试">
<meta http-equiv="content-type" content="text/html; charset=gb2312">
</head>
<body>
<form method="post" action="sendmail.jsp">
<table border="1" cellpadding="0" cellspacing="3" align="center">
<tr>
<td>邮件服务器</td><td><input type="text" name="host" value="mail.keylab.net"></td>
</tr>
<tr>
<td>用户名</td><td><input type="text" name="user" value="wangmj@keylab.net"></td>
</tr>
<tr>
<td>密码</td><td><input type="password" name="password" value="root3wmj"></td>
</tr>
<tr>
<td>邮件主体</td><td><input type="text" name="subject" value="邮件发送测试"></td>
</tr>
<tr>
<td>收件人</td><td><input type="text" name="to" value="wangmj@keylab.net"></td>
</tr>
<tr>
<td>发送人</td><td><input type="text" name="from" value="wangmj@keylab.net"></td>
</tr>
<tr>
<td>邮件内容</td><td><input type="text" name="bodyashtml" value="大家好！邮件测试。"></td>
</tr>
<tr>
<td>附件</td><td><input type="text" name="attachfile" value="d://myforum.txt"></td>
</tr>
<tr>
<td><input type="submit" name="submit" value="发送" ></td>
<td><input type="reset" name="reset" value="重置" ></td>
</tr>
</table>
</form>
</body>
</html>