【Mail】Tomcat提供JNDI方式支持JavaMail（三）

流程介绍　　

　　Tomcat提供了JavaMail的支持，是通过JNDI的方式实现的，具体流程是：

　　Tomcat启动的时候，自身产生一个Session对象，放在JNDI容器中给其他项目调用，其他项目只要通过JNDI API就能获取JNDI中的对象，并在项目中使用。

　　

使用步骤

1. 配置JNDI资源：新建一个javaweb的maven项目，并在webapp/META-INF中新建一个文件context.xml。
   
   
   context.xml文件内容如下：
   
   

   1 <Context>2   <Resource name="mail/Session" auth="Container"3             type="javax.mail.Session"4             mail.smtp.host="smtp.163.com" mail.smtp.auth="true"5             mail.transport.protocol="smtp"6             />7 </Context>

   

    

2. 添加javamail到tomcat的lib目录：Tomcat要新建session对象，那么tomcat就需要引入mail.jar包
   
3. 在java程序中通过JNDI API获取mail的session对象：写一个类MailServlet.java，去获取session对象。
   
   • MailServlet.java
     
     

      1 package com.hd.javamail.servlet; 2  3 import java.io.IOException; 4  5 import javax.mail.Address; 6 import javax.mail.Message; 7 import javax.mail.MessagingException; 8 import javax.mail.Session; 9 import javax.mail.Transport;10 import javax.mail.internet.InternetAddress;11 import javax.mail.internet.MimeMessage;12 import javax.naming.Context;13 import javax.naming.InitialContext;14 import javax.naming.NamingException;15 import javax.servlet.ServletException;16 import javax.servlet.http.HttpServlet;17 import javax.servlet.http.HttpServletRequest;18 import javax.servlet.http.HttpServletResponse;19 20 21 /**22  * Servlet implementation class MailServlet23  */24 public class MailServlet extends HttpServlet {25     private static final long serialVersionUID = 1L;26 27     /**28      * Default constructor. 29      */30     public MailServlet() {31         // TODO Auto-generated constructor stub32     }33 34     /**35      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)36      */37     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {38         doPost(request, response);39     }40 41     /**42      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)43      */44     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {45 46         try {47             //从tomcat中获取JNDI容器48             Context initCtx = new InitialContext();49             Context envCtx = (Context) initCtx.lookup("java:comp/env");50             //JNDI中获取Mail的Session对象51             Session session = (Session) envCtx.lookup("mail/Session");52             53             //新建一个邮件54             Message message = new MimeMessage(session);55             //设置发件人56             message.setFrom(new InternetAddress("[e-mail]"));57             //设置多个收件人58             message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("[e-mail]"));59             //设置主题60             message.setSubject("ha");61             //设置文本62             message.setText("test");63             64             //邮件传送对象65             Transport transport = session.getTransport();66             //设置，邮件服务器地址、用户名、密码67             transport.connect("smtp.163.com", "[e-mail]", "xxxxxx");68             //发送邮件（邮件，地址）69             transport.sendMessage(message,  new Address[] {new InternetAddress("[e-mail]")} );70             //关闭连接71             transport.close();72             73             response.getWriter().print("ok!");74             75         } catch (MessagingException e) {76             // TODO Auto-generated catch block77             e.printStackTrace();78         } catch (NamingException e) {79             // TODO Auto-generated catch block80             e.printStackTrace();81         }82     }83 84 }

     

      

   • web.xml中配置MailServlet
     
     

      1 <!DOCTYPE web-app PUBLIC 2  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 3  "http://java.sun.com/dtd/web-app_2_3.dtd" > 4  5 <web-app> 6     <display-name>test-javamail</display-name> 7     <servlet> 8         <servlet-name>MailServlet</servlet-name> 9         <display-name>MailServlet</display-name>10         <description></description>11         <servlet-class>com.hd.javamail.servlet.MailServlet</servlet-class>12     </servlet>13     <servlet-mapping>14         <servlet-name>MailServlet</servlet-name>15         <url-pattern>/MailServlet</url-pattern>16     </servlet-mapping>17     18 </web-app>

     

      

   • 注意pom文件中mail.jar的引用，只需在编译的时候使用，运行的时候使用前面tomcat／lib目录下的mail.jar包。所以需要如下配置，否则会出错。
     
     

      1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 3     <modelVersion>4.0.0</modelVersion> 4     <groupId>com.hd</groupId> 5     <artifactId>test-javamail</artifactId> 6     <packaging>war</packaging> 7     <version>0.0.1-SNAPSHOT</version> 8     <name>test-javamail Maven Webapp</name> 9     <url>http://maven.apache.org</url>10     <dependencies>11     12         <!-- javamail -->13         <dependency>14             <groupId>javax.mail</groupId>15             <artifactId>mail</artifactId>16             <version>1.4.7</version>17             <scope>provided</scope><!-- 仅编译的时候使用，运行是由tomcat提供 -->18         </dependency>19         20         <dependency>21             <groupId>javax.servlet</groupId>22             <artifactId>javax.servlet-api</artifactId>23             <version>3.0.1</version>24             <scope>provided</scope>25         </dependency>26         <dependency>27             <groupId>javax.servlet.jsp</groupId>28             <artifactId>jsp-api</artifactId>29             <version>2.2</version>30             <scope>provided</scope>31         </dependency>32 33         <dependency>34             <groupId>junit</groupId>35             <artifactId>junit</artifactId>36             <version>3.8.1</version>37             <scope>test</scope>38         </dependency>39     </dependencies>40     <build>41         <finalName>test-javamail</finalName>42     </build>43 </project>

     

      

测试运行

　　在浏览器中访问MailServlet，地址：http://ip:端口/test-javamail/MailServlet
　　

 

http://www.cnblogs.com/h--d/p/6139509.html