【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
- 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>
- 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
- 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 MailServlet 23 */ 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 stub 32 } 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("xxxx@163.com")); 57 //设置多个收件人 58 message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("123456@qq.com")); 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", "xxxx@163.com", "xxxxxx"); 68 //发送邮件（邮件，地址） 69 transport.sendMessage(message, new Address[] {new InternetAddress("123456@qq.com")} ); 70 //关闭连接 71 transport.close(); 72 73 response.getWriter().print("ok!"); 74 75 } catch (MessagingException e) { 76 // TODO Auto-generated catch block 77 e.printStackTrace(); 78 } catch (NamingException e) { 79 // TODO Auto-generated catch block 80 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>
- MailServlet.java
测试运行
在浏览器中访问MailServlet，地址：http://ip:端口/test-javamail/MailServlet