本章將教你如何使用Struts2 的應用程序發送電子郵件。對于此練習中，需要下載并安裝將mail.jar 從 JavaMail API1.4.4，并將 mail.jar文件放置在WEB-INFlib文件夾，然后繼續遵循的標準步驟創建動作，視圖和配置文件。
創建動作：
下一步是創建一個Action方法，發送電子郵件。讓我們創建一個新類稱為 Emailer.java 以下內容。
package com.yiibai.struts2;import java.util.Properties;import javax.mail.Message;import javax.mail.PasswordAuthentication;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import com.opensymphony.xwork2.ActionSupport;public class Emailer extends ActionSupport { private String from; private String password; private String to; private String subject; private String body; static Properties properties = new Properties(); static { properties.put("mail.smtp.host", "smtp.gmail.com"); properties.put("mail.smtp.socketFactory.port", "465"); properties.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); properties.put("mail.smtp.auth", "true"); properties.put("mail.smtp.port", "465"); } public String execute() { String ret = SUCCESS; try { Session session = Session.getDefaultInstance(properties, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(from, password); }}); Message message = new MimeMessage(session); message.setFrom(new InternetAddress(from)); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to)); message.setSubject(subject); message.setText(body); Transport.send(message); } catch(Exception e) { ret = ERROR; e.printStackTrace(); } return ret; } public String getFrom() { return from; } public void setFrom(String from) { this.from = from; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getTo() { return to; } public void setTo(String to) { this.to = to; } public String getSubject() { return subject; } public void setSubject(String subject) { this.subject = subject; } public String getBody() { return body; } public void setBody(String body) { this.body = body; } public static Properties getProperties() { return properties; } public static void setProperties(Properties properties) { Emailer.properties = properties; }}可以看到在上面的源代碼中，Emailer.java有對應的形式在下面給出的email.jsp頁的屬性的屬性。這些屬性
我們有沒有考慮過上述各個屬性的任何驗證，驗證將被添加在下一章。現在讓我們看看在execute()方法。 execute()方法使用使用javax郵件庫發送一封電子郵件，使用提供的參數。如果郵件被發送，動作返回 SUCCESS，否則它返回ERROR。
創建主頁頁：
讓我們編寫主頁index.jsp的JSP文件，這將被用來收集電子郵件的相關信息，上面提到的：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><title>Email Form</title></head><body> <em>The form below uses Google's SMTP server. So you need to enter a gmail username and password </em> <form action="emailer" method="post"> <label for="from">From</label><br/> <input type="text" name="from"/><br/> <label for="password">Password</label><br/> <input type="password" name="password"/><br/> <label for="to">To</label><br/> <input type="text" name="to"/><br/> <label for="subject">Subject</label><br/> <input type="text" name="subject"/><br/> <label for="body">Body</label><br/> <input type="text" name="body"/><br/> <input type="submit" value="Send Email"/> </form></body></html>
創建視圖：
我們將使用JSP文件的success.jsp將被調用的情況下行動返回SUCCESS，但在發生ERROR 的情況下，我們將有另一種視圖認為文件是從操作返回。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><title>Email Success</title></head><body> Your email to <s:property value="to"/> was sent successfully.</body></html>
下面將是在一個錯誤的情況下，從動作返回視圖文件error.jsp。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><title>Email Error</title></head><body> There is a problem sending your email to <s:property value="to"/>.</body></html>
配置文件：
現在，讓我們將這一切組合起來使用struts.xml的配置文件如下：
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <constant name="struts.devMode" value="true" /> <package name="helloworld" extends="struts-default"> <action name="emailer" class="com.yiibai.struts2.Emailer" method="execute"> <result name="success">/success.jsp</result> <result name="error">/error.jsp</result> </action> </package></struts>
以下是web.xml文件中的內容：
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>Struts 2</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.FilterDispatcher </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>
現在，右鍵點擊項目名稱，并單擊 Export > WAR File創建一個WAR文件。然后部署此WAR在Tomcat的webapps目錄下。最后，啟動Tomcat服務器和嘗試訪問URL http://localhost:8080/HelloWorldStruts2/index.jsp。這會給出以下畫面：
輸入所需信息，并單擊“Send Email ”按鈕。如果一切順利，那么應該看到以下頁面：
如果是SSH三個框架配合起來使用，這里再給個例子，不過struts和spring的框架外，也需要mail.jar,activation.jar.
1) 首先在applicationContext.xml文件中配置bean
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl"> <property name="host" value="host"/> <property name="username" value="username"/> <property name="password" value="password"/> </bean><bean id="sendMailAction" class="cn.com.action.SendMailAction" singleton="false"> <property name="mailSender"><ref bean="mailSender"/> </property></bean>
2)實現發送郵件java類代碼
protected JavaMailSenderImpl mailSender;public class SendMailAction extends ActionSupport{public void setMailSender(JavaMailSenderImpl mailSender) { this.mailSender = mailSender;}public void sendMail() throws Exception {1:簡單郵件
protected JavaMailSenderImpl mailSender;public class SendMailAction extends ActionSupport{public void setMailSender(JavaMailSenderImpl mailSender) { this.mailSender = mailSender;}public void sendMail() throws Exception {2：HTML郵件的發送
//建立郵件消息,發送簡單郵件和html郵件的區別 MimeMessage mailMessage = senderImpl.createMimeMessage(); MimeMessageHelper messageHelper = new MimeMessageHelper(mailMessage); //設置收件人，寄件人 messageHelper.setTo("sun111@163.com"); messageHelper.setFrom("webadmin@163.com"); messageHelper.setSubject("測試HTML郵件！"); //true 表示啟動HTML格式的郵件 messageHelper.setText("<html><head></head><body><h1>hello!!zhangjian</h1></body></html>",true); //發送郵件 senderImpl.send(mailMessage); 3：本類測試郵件中嵌套圖片
//建立郵件消息,發送簡單郵件和html郵件的區別 MimeMessage mailMessage = senderImpl.createMimeMessage(); //注意這里的boolean,等于真的時候才能嵌套圖片，在構建MimeMessageHelper時候，所給定的值是true表示啟用， multipart模式 MimeMessageHelper messageHelper = new MimeMessageHelper(mailMessage,true); //設置收件人，寄件人 messageHelper.setTo("sun111@163.com"); messageHelper.setFrom("webadmin@163.com"); messageHelper.setSubject("測試郵件中嵌套圖片!！"); //true 表示啟動HTML格式的郵件 messageHelper.setText("<html><head></head><body><h1>hello!!zhangjian</h1>" + "<img src="/" mce_src="/""cid:aaa/"/></body></html>",true); FileSystemResource img = new FileSystemResource(new File("c:/aaa.jpg")); messageHelper.addInline("aaa",img); //發送郵件 senderImpl.send(mailMessage); }}新聞熱點
疑難解答
