Java实现邮件发送

在日常工作中经常会遇到需要发送邮件的情况，比如要通知某个人当前某一指标数据、系统告警等内容。
现在通过Java实现邮件发送功能，具体代码如下：

import java.io.File;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.mail.HtmlEmail;
import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
import freemarker.template.Configuration;
import freemarker.template.Template;
/**
 * 	发送邮件工具类
 * 	用到的jar包（commons-email-1.5.jar、activation.jar、mail.jar、freemarker.jar、spring-context-support-3.2.4.RELEASE.jar）
 */
public class SendMailUtil{
	
  //发送邮箱地址
  private  String from = ""; 
  //发送人
  private  String fromName = "";
  //用户名
  private  String username = "";
  //密码
  private  String password = "";
  //编码格式
  private  String charSet = "";
  
  /**
   * 构造方法
   * @param from
   * @param fromName
   * @param username
   * @param password
   * @param charSet
   */
  public SendMailUtil(String from,String fromName,String username,String password,String charSet) {
	this.from = from;
	this.fromName = fromName;
	this.username = username;
	this.password = password;
	this.charSet = charSet;
  }
  

  private static Map<String, String> hostMap = new HashMap<String, String>();
  static {
		// 126
		hostMap.put("smtp.126", "smtp.126.com");
		
		// qq
		hostMap.put("smtp.qq", "smtp.qq.com");

		// 163
		hostMap.put("smtp.163", "smtp.163.com");

		// sina
		hostMap.put("smtp.sina", "smtp.sina.com.cn");

		// tom
		hostMap.put("smtp.tom", "smtp.tom.com");

		// 263
		hostMap.put("smtp.263", "smtp.263.net");

		// yahoo
		hostMap.put("smtp.yahoo", "smtp.mail.yahoo.com");

		// hotmail
		hostMap.put("smtp.hotmail", "smtp.live.com");

		// gmail
		hostMap.put("smtp.gmail", "smtp.gmail.com");
		hostMap.put("smtp.port.gmail", "465");
		
		hostMap.put("smtp.trht", "smtp.exmail.qq.com");
	}

	/**
	 * 	获取邮箱服务器
	 * @param email 邮箱地址
	 * @return
	 * @throws Exception
	 */
	public static String getHost(String email) throws Exception {
		Pattern pattern = Pattern.compile("\\w+@(\\w+)(\\.\\w+){1,2}");
		Matcher matcher = pattern.matcher(email);
		String key = "unSupportEmail";
		if (matcher.find()) {
			key = "smtp." + matcher.group(1);
		}
		if (hostMap.containsKey(key)) {
			return hostMap.get(key);
		} else {
			throw new Exception("unSupportEmail");
		}
	}

	/**
	 * 	获取邮箱发送端口
	 * @param email
	 * @return
	 * @throws Exception
	 */
	public static int getSmtpPort(String email) throws Exception {
		Pattern pattern = Pattern.compile("\\w+@(\\w+)(\\.\\w+){1,2}");
		Matcher matcher = pattern.matcher(email);
		String key = "unSupportEmail";
		if (matcher.find()) {
			key = "smtp.port." + matcher.group(1);
		}
		if (hostMap.containsKey(key)) {
			return Integer.parseInt(hostMap.get(key));
		} else {
			return 25;
		}
	}

	/**
	 * 发送普通邮件
	 * @param toMailAddr 收信人地址
	 * @param subject email主题
	 * @param message 发送email信息  
	 */
	public void sendCommonMail(String toMailAddr, String subject, String message) {
		  HtmlEmail hemail = new HtmlEmail();
		try {
			hemail.setHostName(getHost(from));
			hemail.setSmtpPort(getSmtpPort(from));
			hemail.setCharset(charSet);
			hemail.addTo(toMailAddr);
			hemail.setFrom(from, fromName);
			hemail.setAuthentication(username, password);
			hemail.setSubject(subject);
			hemail.setMsg(message);
			hemail.send();
			System.out.println("email send true!");
		} catch (Exception e) {
			System.out.println("email send error!" + e.getMessage());
		}
		
	}
	
	/**
	 * 发送模板邮件
	 * @param toMailAddr  收信人地址
	 * @param subject email主题
	 * @param templatePath 模板地址
	 * @param map 模板map
	 */
	public void sendFtlMail(String toMailAddr, String subject,String templatePath, Map<String, Object> map){
	  Template template = null;
	  Configuration freeMarkerConfig = null;
	  HtmlEmail hemail = new HtmlEmail();
		try {
		  hemail.setHostName(getHost(from));
		  hemail.setSmtpPort(getSmtpPort(from));
		  hemail.setCharset(charSet);
		  hemail.addTo(toMailAddr);
		  hemail.setFrom(from, fromName);
		  hemail.setAuthentication(username, password);
		  hemail.setSubject(subject);
		  freeMarkerConfig = new Configuration();
		  freeMarkerConfig.setDirectoryForTemplateLoading(new File(getFilePath(templatePath)));
		  // 获取模板
		  template = freeMarkerConfig.getTemplate(getFileName(templatePath),new Locale("Zh_cn"), "UTF-8");
			// 模板内容转换为string
		  String htmlText = FreeMarkerTemplateUtils.processTemplateIntoString(template, map);
		  System.out.println(htmlText);
		  hemail.setMsg(htmlText);
		  hemail.send();
		  System.out.println("email send true!");
		} catch (Exception e) {
		  e.printStackTrace();
		  System.out.println("email send error!");
		}
   }

	/**
	 * 获取模板文件内容
	 * @param templatePath
	 * @param map
	 * @return
	 */
	public static String getHtmlText(String templatePath, Map<String, Object> map){
		  Template template = null;
		  String htmlText = "";
		  try {
			Configuration freeMarkerConfig = null;
			  freeMarkerConfig = new Configuration();
			  freeMarkerConfig.setDirectoryForTemplateLoading(new File(getFilePath(templatePath)));
			  // 获取模板
			  template = freeMarkerConfig.getTemplate(getFileName(templatePath),new Locale("Zh_cn"), "UTF-8");
				// 模板内容转换为string
			  htmlText = FreeMarkerTemplateUtils.processTemplateIntoString(template, map);
			  System.out.println(htmlText);
		} catch (Exception e) {
			e.printStackTrace();
		}
		  return htmlText;
	}
	
  
	//获取模板路径
	private static String getFilePath(String path) {
		path = path.replace("\\", "/");
		System.out.println(path);
		return path.substring(0,path.lastIndexOf("/") + 1);
	}
	//获取模板名
	private static String getFileName(String path) {
		path = path.replace("\\", "/");
		System.out.println(path);
		return path.substring(path.lastIndexOf("/") + 1);
	}
  
	
	/**
	 * 	测试方法
	 * @param args
	 */
	public static void main(String[] args){
	  try {
		  
		  SendMailUtil smu = new SendMailUtil("testUser@163.com","testUser","testUser@163.com","testUser123","UTF-8");
		  //测试发送普通邮件
		  smu.sendCommonMail("testUser@tom.com", "测试普通邮件", "测试普通邮件测试普通邮件测试普通邮件测试普通邮件测试普通邮件测试普通邮件测试普通邮件");
		  //测试通过模板发送邮件
		  Map<String, Object> map = new HashMap<String, Object>(); 
		  map.put("mailTitle","测试短信模板发送"); 
		  map.put("mailContent", "测试短信模板发送测试短信模板发送测试短信模板发送测试短信模板发送测试短信模板发送测试短信模板发送测试短信模板发送测试短信模板发送"); 
		  String templatePath ="D:/webProjects/myTools_workspace/testFile/template/testMail.ftl"; 
		  smu.sendFtlMail("testUser@tom.com","sendemail test!",templatePath, map); 

		  System.out.println("email send true!");
		} catch (Exception e) {
		  e.printStackTrace();
		  System.out.println("email send error!");
		}
	}

}

相关jar包及测试模板如下：
https://files-cdn.cnblogs.com/files/weihbs/邮件发送工具类相关jar包及测试模板.zip