邮件发送以及javax.mail.NoSuchProviderException: Unable to locate provider for protocol: smtp解决方案

首先是类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


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 java.util.Properties;


/**
 * @Author: zhangshulong
 * @Description:
 * @Date: Created in 13:45  2016/11/30
 */
public class MailUtil {private static final Logger LOGGER = LoggerFactory.getLogger(MailUtil.class);
    private static String mailSmtpServer;
    private static String mailFrom;
    private static String mailPassword;
    private static MimeMessage message;
    private static Session session;

    private static Properties properties = new Properties();
    /**
     * 发送邮件
     */
    public static ExecuteResult<String> sendEmail(String subject, String sendHtml, String receiveUser) {ExecuteResult<String> excute = new ExecuteResult<String>();
        try {mailFrom = Env.getProperty(Env.SEND_FORM);
            mailSmtpServer = Env.getProperty(Env.SMTP_SERVER);
            mailPassword = Env.getProperty(Env.MAIL_PASSWARD);

            session = Session.getInstance(properties);
            message = new MimeMessage(session);

            doSendHtmlEmail(subject, sendHtml, receiveUser);
        } catch (Exception e) {LOGGER.error("发送邮件失败！");
            excute.addErrorMessage("发送邮件失败");
            excute.setResult("发送邮件失败");
            return excute;
        }excute.setResult("发送邮件成功");
        return excute;
    }/**
     * 发送邮件
     *
     * @param subject     邮件主题
     * @param htmlContent    邮件内容
     * @param receiveUser 收件人地址
     */
    private static void doSendHtmlEmail(String subject, String htmlContent, String receiveUser) throws javax.mail.MessagingException {try {Properties props = new Properties();
            // 开启debug调试
            props.setProperty("mail.debug", "true");
            // 发送服务器需要身份验证
            props.setProperty("mail.smtp.auth", "true");
            // 设置邮件服务器主机名
            props.setProperty("mail.host", mailSmtpServer);
            // 发送邮件协议名称
            props.setProperty("mail.transport.protocol", "smtp");

            // 设置环境信息
            Session localSession = Session.getInstance(props, new javax.mail.Authenticator() {// 在session中设置账户信息，Transport发送邮件时会使用
                protected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(mailFrom, mailPassword);
                }});

            // 创建邮件对象
            Message msg = new MimeMessage(localSession);
            // 发件人
            msg.setFrom(new InternetAddress(mailFrom));
            // 多个收件人
            msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(receiveUser));
            // 抄送人
            //msg.setRecipient(Message.RecipientType.CC, new InternetAddress("java_mail_001@163.com"));
            // 暗送人
            //msg.setRecipient(Message.RecipientType.BCC, new InternetAddress("java_mail_004@163.com"));

            // 主题
            msg.setSubject(subject);
            // HTML内容
            msg.setContent(htmlContent, "text/html;charset=utf-8");
            Transport.send(msg);
        } catch (Exception e) {e.printStackTrace();
        }}}

然后 可能会碰到如下情况

javax.mail.NoSuchProviderException: Unable to locate provider for protocol: smtp

这是由于jar包冲突造成的

如果你是maven，则只要添加下面代码就行就行

首先是忽略这两个jar包（exclusion就是忽略jar包）

<exclusion>
    <groupId>org.apache.geronimo.specs</groupId>
    <artifactId>geronimo-javamail_1.4_spec</artifactId>
</exclusion>
<exclusion>
    <groupId>org.apache.geronimo.specs</groupId>
    <artifactId>geronimo-activation_1.1_spec</artifactId>
</exclusion>

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.1</version>
</dependency>

<dependency>
    <groupId>javax.activation</groupId>
    <artifactId>activation</artifactId>
    <version>1.0.2</version>
</dependency>