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package com.mail.servlet;import com.util.mail.MailSenderInfo;
import com.util.mail.SimpleMailSender;
import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.util.mail.MailSenderInfo;
import com.util.mail.SimpleMailSender;public class SendMailServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//设置字符编码request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");//从页面获取参数String userName = request.getParameter("username");String serverHost = request.getParameter("serverhost");String password =request.getParameter("password");String toAddress =request.getParameter("toaddress");String subject =request.getParameter("subject");String content =request.getParameter("content");//发送方邮箱SMTP服务器地址String mailServerHost = "smtp." + serverHost;//发送方邮箱SMTP服务器的端口, qq.com、163.com、126.com、sina.com、sohu.com等的端口号都为25  String mailServerPort = "25";//如果前台页面中需要添加邮箱类型，如gmail.com，则这里可以添加以下语句处理//if(serverHost.equals("gmail.com"))//{//    mailServerPort = "587";//}//发送方的邮箱账号userName = userName + "@" + serverHost;//测试获取到的用户名是否正确System.out.println(userName);//发送方的邮箱地址String fromAddress = userName;//测试获取到的用户名是否正确System.out.println(fromAddress);//这个类主要是设置邮件  MailSenderInfo mailInfo = new MailSenderInfo();//服务器与端口的对应关系：  smtp.qq.com -> 25或587    smtp.163.com -> 25mailInfo.setMailServerHost(mailServerHost); //发送方的SMTP服务器地址  mailInfo.setMailServerPort(mailServerPort);   //发送方SMTP服务器端口mailInfo.setValidate(true);   //设置SMTP服务器需要身份验证mailInfo.setUserName(userName);  //发送方邮箱账号 mailInfo.setPassword(password);  //发送方邮箱密码   mailInfo.setFromAddress(fromAddress);   //发送方邮箱地址mailInfo.setToAddress(toAddress);    //接收方邮箱地址mailInfo.setSubject(subject);   //邮件标题mailInfo.setContent(content);    //邮件内容 //这个类主要来发送邮件     SimpleMailSender sms = new SimpleMailSender();    boolean flag = false;  flag = sms.sendHtmlMail(mailInfo);//发送html格式    //如果邮件发送成功，则跳转到success.jsp页面；否则，跳转到fail.jsp页面if(flag){   System.out.println("发送html格式mail 成功！");response.sendRedirect("success.jsp");}else {System.out.println("发送html格式mail 失败！");response.sendRedirect("fail.jsp");}}}

package com.util.mail;
/** 
* 发送邮件需要使用的基本信息 
*/ 
import java.util.Properties; 
public class MailSenderInfo { // 发送邮件的服务器的IP和端口 private String mailServerHost; private String mailServerPort = "25"; // 邮件发送者的地址 private String fromAddress; // 邮件接收者的地址 private String toAddress; // 登陆邮件发送服务器的用户名和密码 private String userName; private String password; // 是否需要身份验证 private boolean validate = false; // 邮件主题 private String subject; // 邮件的文本内容 private String content; // 邮件附件的文件名 private String[] attachFileNames; 	/** * 获得邮件会话属性 */ public Properties getProperties(){ Properties p = new Properties(); p.put("mail.smtp.host", this.mailServerHost); p.put("mail.smtp.port", this.mailServerPort); p.put("mail.smtp.auth", validate ? "true" : "false"); return p; } public String getMailServerHost() { return mailServerHost; } public void setMailServerHost(String mailServerHost) { this.mailServerHost = mailServerHost; }public String getMailServerPort() { return mailServerPort; }public void setMailServerPort(String mailServerPort) { this.mailServerPort = mailServerPort; }public boolean isValidate() { return validate; }public void setValidate(boolean validate) { this.validate = validate; }public String[] getAttachFileNames() { return attachFileNames; }public void setAttachFileNames(String[] fileNames) { this.attachFileNames = fileNames; }public String getFromAddress() { return fromAddress; } public void setFromAddress(String fromAddress) { this.fromAddress = fromAddress; }public String getPassword() { return password; }public void setPassword(String password) { this.password = password; }public String getToAddress() { return toAddress; } public void setToAddress(String toAddress) { this.toAddress = toAddress; } public String getUserName() { return userName; }public void setUserName(String userName) { this.userName = userName; }public String getSubject() { return subject; }public void setSubject(String subject) { this.subject = subject; }public String getContent() { return content; }public void setContent(String textContent) { this.content = textContent; } 
} 

package com.util.mail;import javax.mail.*;public class MyAuthenticator extends Authenticator{String userName=null;String password=null;public MyAuthenticator(){}public MyAuthenticator(String username, String password) { this.userName = username; this.password = password; } protected PasswordAuthentication getPasswordAuthentication(){return new PasswordAuthentication(userName, password);}
}

package com.util.mail;import java.util.Date; 
import java.util.Properties;
import javax.mail.Address; 
import javax.mail.BodyPart; 
import javax.mail.Message; 
import javax.mail.MessagingException; 
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; /** 
* 简单邮件（不带附件的邮件）发送器 
*/ 
public class SimpleMailSender  { 
/** * 以文本格式发送邮件 * @param mailInfo 待发送的邮件的信息 */ public boolean sendTextMail(MailSenderInfo mailInfo) { // 判断是否需要身份认证 MyAuthenticator authenticator = null; Properties pro = mailInfo.getProperties();if (mailInfo.isValidate()) { // 如果需要身份认证，则创建一个密码验证器 authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword()); }// 根据邮件会话属性和密码验证器构造一个发送邮件的session Session sendMailSession = Session.getDefaultInstance(pro,authenticator); try { // 根据session创建一个邮件消息 Message mailMessage = new MimeMessage(sendMailSession); // 创建邮件发送者地址 Address from = new InternetAddress(mailInfo.getFromAddress()); // 设置邮件消息的发送者 mailMessage.setFrom(from); // 创建邮件的接收者地址，并设置到邮件消息中 Address to = new InternetAddress(mailInfo.getToAddress()); mailMessage.setRecipient(Message.RecipientType.TO,to); // 设置邮件消息的主题 mailMessage.setSubject(mailInfo.getSubject()); // 设置邮件消息发送的时间 mailMessage.setSentDate(new Date()); // 设置邮件消息的主要内容 String mailContent = mailInfo.getContent(); mailMessage.setText(mailContent); // 发送邮件 Transport.send(mailMessage);return true; } catch (MessagingException ex) { ex.printStackTrace(); } return false; } /** * 以HTML格式发送邮件 * @param mailInfo 待发送的邮件信息 */ public static boolean sendHtmlMail(MailSenderInfo mailInfo){ // 判断是否需要身份认证 MyAuthenticator authenticator = null;Properties pro = mailInfo.getProperties();//如果需要身份认证，则创建一个密码验证器  if (mailInfo.isValidate()) { authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword());} // 根据邮件会话属性和密码验证器构造一个发送邮件的session// Session.getInstance(pro,authenticator);每次发生时获取一个新的session对象// Session.getDefaultInstance(pro,authenticator);先看之前有没有session对象，如果没有，就new一个；如果有，则直接使用之前那个Session sendMailSession = Session.getInstance(pro,authenticator); try { // 根据session创建一个邮件消息 Message mailMessage = new MimeMessage(sendMailSession); // 创建邮件发送者地址 Address from = new InternetAddress(mailInfo.getFromAddress()); // 设置邮件消息的发送者 mailMessage.setFrom(from); // 创建邮件的接收者地址，并设置到邮件消息中 Address to = new InternetAddress(mailInfo.getToAddress()); // Message.RecipientType.TO属性表示接收者的类型为TO mailMessage.setRecipient(Message.RecipientType.TO,to); // 设置邮件消息的主题 mailMessage.setSubject(mailInfo.getSubject()); // 设置邮件消息发送的时间 mailMessage.setSentDate(new Date()); // MiniMultipart类是一个容器类，包含MimeBodyPart类型的对象 Multipart mainPart = new MimeMultipart(); // 创建一个包含HTML内容的MimeBodyPart BodyPart html = new MimeBodyPart(); // 设置HTML内容 html.setContent(mailInfo.getContent(), "text/html; charset=utf-8"); mainPart.addBodyPart(html); // 将MiniMultipart对象设置为邮件内容 mailMessage.setContent(mainPart); // 发送邮件 Transport.send(mailMessage); return true; } catch (MessagingException ex) { ex.printStackTrace(); } return false; } 
} 

package com.util.mail;public class Test {public static void main(String[] args){  //这个类主要是设置邮件  MailSenderInfo mailInfo = new MailSenderInfo();//服务器与端口的对应关系：  smtp.qq.com -> 587    smtp.163.com -> 25mailInfo.setMailServerHost("smtp.163.com"); //发送方的邮件服务器地址  mailInfo.setMailServerPort("25");   //发送方SMTP服务器端口mailInfo.setValidate(true);   //设置SMTP服务器需要身份验证mailInfo.setUserName("18316022546@163.com");  //发送方邮箱账号 mailInfo.setPassword("xxxxxxxxxxxx");  //发送方邮箱密码   mailInfo.setFromAddress("18316022546@163.com");   //发送方邮箱地址mailInfo.setToAddress("dgh18316022546@sina.com");    //接收方邮箱地址mailInfo.setSubject("java mail发送邮件的测试");   //邮件标题mailInfo.setContent("这是我在测试用java mail来发邮件");    //邮件内容 //这个类主要来发送邮件     SimpleMailSender sms = new SimpleMailSender();    //boolean flag1 = false;//flag1 = sms.sendTextMail(mailInfo);//发送文体格式      //if(flag1)  //    System.out.println("发送文体格式mail 成功！");boolean flag2 = false;  flag2 = sms.sendHtmlMail(mailInfo);//发送html格式    if(flag2)  System.out.println("发送html格式mail 成功！");  }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"><display-name></display-name><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>SendMailServlet</servlet-name><servlet-class>com.mail.servlet.SendMailServlet</servlet-class></servlet><servlet-mapping><servlet-name>SendMailServlet</servlet-name><url-pattern>/SendMailServlet</url-pattern></servlet-mapping>	<welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list>
</web-app>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>首页</title></head>  <body><a href="sendMail.jsp">去发一封邮件</a> <br></body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>">    <title>发送邮件</title><style type="text/css">.label{ float: left; width: 200px; text-align: right; }.b{color: red;}</style></head><body><form action="SendMailServlet" method="post"><p><label>请登录您的邮箱</label></p><label class="label"><b class="b">*</b> 邮箱账号:</label>  <input type="text" name="username" size="30" maxlength="25" /><select name="serverhost"><option value="qq.com">@qq.com</option><option value="163.com">@163.com</option><option value="sina.com">@sina.com</option>      <option value="sohu.com">@sohu.com</option>         <option value="126.com">@126.com</option></select><br /><label class="label"><b class="b">*</b> 邮箱密码:</label>  <input type="password" name="password" size="30" maxlength="25" /><br /><label class="label"><b class="b">*</b> 收件人邮箱:</label>  <input type="text" name="toaddress" size="30" maxlength="25" /><br /><label class="label">邮件标题:</label>  <input type="text" name="subject" size="100" maxlength="200" /><br /><label class="label">邮件内容:</label>  <textarea name="content" rows="15" cols="85"></textarea><br /><label class="label"><input type="submit" value="发送" /></label></form> </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>发送成功 </title></head><body>恭喜，发送邮件成功 ！点<a href="sendMail.jsp">这里</a>回去再发一封。</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>发送失败</title></head><body>抱歉，发送邮件失败 ！点<a href="sendMail.jsp"><b>这里</b></a>回去重新发一封。</body>
</html>

需要注意的地方