java实现发送邮件

话不多说上代码：

1.需要依赖包：mail.jar

	<dependency>
		<groupId>javax.mail</groupId>
		<artifactId>mail</artifactId>
		<version>1.4.4</version>
	</dependency>

2.mail工具类：

此类里面的一些邮箱服务器参数需要自己去配置修改，否则无法测试通过（如果写在了配置文件里，可以通过注解方式来获取等）。如果你不需要日志等打印，请注释掉日志代码。此类里面封装了连个发邮件的方法，参数是EmailInfo的只是对下面测试中的那个方法的一个封装，如果你需要封装，博客最下面会附上代码。如果不需要，请忽略；

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.mail.internet.MimeMessage;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;


public abstract class EmailUtil {

	private final static Logger logger = LoggerFactory.getLogger(EmailUtil.class);
	private static JavaMailSenderImpl mailSender;
	private static String mailbox_server;
	
	private EmailUtil() {
		
	}
	
	static{
		init();
	}

	private static void init(){
		mailSender = new JavaMailSenderImpl();
		mailSender.setDefaultEncoding("UTF-8");
		mailSender.setPort("mailbox_server_port"));//这里的参数都是从配置文件里读取的 自己修改  端口号是数值型
		mailSender.setHost("mailbox_server_host");//主机地址
		mailSender.setUsername("mailbox_server_username");//邮箱服务器发件人名称
		mailSender.setPassword("mailbox_server_password");//邮箱服务器密码
		mailbox_server ="mailbox_server";//这些对应填写就行，也不知道写的对应不对应
	}
	
	
	private static void validateEmail(String[] email) {
		if(email == null)
			throw new EmailUtilException("邮箱为null");
		String check = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
		for (int i = 0; i < email.length; i++) {
			Pattern regex = Pattern.compile(check);
			Matcher matcher = regex.matcher(email[i]);
			if(!matcher.matches())
				throw new EmailUtilException("邮箱格式校验错误...");
		}
	}

	
	public static void sendEmail(EmailInfo emailInfo){
		if(null == emailInfo)
			return;
		validateEmail(emailInfo.getDestination());
		MimeMessage message = mailSender.createMimeMessage();
		MimeMessageHelper helper = new MimeMessageHelper(message);
		try {
			helper.setFrom(mailbox_server);
			helper.setSubject(emailInfo.getTitle());
			helper.setText(emailInfo.getMailContent());
			helper.setTo(emailInfo.getDestination());
			mailSender.send(message);
		} catch (Exception e) {
			logger.warn("发送邮件失败..."+emailInfo.toString());
			e.printStackTrace();
		}
	}
	
	
	public static void sendEmail(String[] email, String title, String content) {
		validateEmail(email);
		MimeMessage message = mailSender.createMimeMessage();
		MimeMessageHelper helper = new MimeMessageHelper(message);
		try {
			helper.setFrom(mailbox_server);
			helper.setSubject(title);
			helper.setText(content);
			helper.setTo(email);
		} catch (Exception e) {
			e.printStackTrace();
		}
		mailSender.send(message);
	}
	public static void main(String[] args) {
		String[] email = {"xx@xx.com","xx@xx.com"};//替换成自己的邮箱即可，可单个可多个
		String title = "测试邮件";
		String content = "测试内容";
		sendEmail(email, title, content);
	}
}
class EmailUtilException extends RuntimeException {
	
	private static final long serialVersionUID = 1L;
	/**
	 * 
	 * @param message
	 */
	public EmailUtilException(String message) {
		super(message);
	}

	/**
	 * 
	 * @param message
	 * @param cause
	 */
	public EmailUtilException(String message, Throwable cause) {
		super(message, cause);
	}

	/**
	 * 
	 * @param cause
	 */
	public EmailUtilException(Throwable cause) {
		super(cause);
	}
}

***********************************如有附件*****************************

3.如果需要上传附件，可以将方法替换成如下代码，附件参数是filemap

public static void sendEmail(String[] email, String title, String content,Map<String,String> filemap) {
	validateEmail(email);
	MimeMessage message = mailSender.createMimeMessage();
	try {
		MimeMessageHelper helper = new MimeMessageHelper(message,true);//设置为true
		helper.setFrom(mailbox_server);
		helper.setSubject(title);
		helper.setText(content);
		helper.setTo(email);
		/*添加附件*/  //map中key为路径，value为对应附件名字
		if(!filemap.isEmpty()){
		    for (Map.Entry<String,String> entry : filemap.entrySet()) {
			File file = new File(entry.getKey());
			FileSystemResource fileSource = new FileSystemResource(file);
			helper.addAttachment(MimeUtility.encodeWord(entry.getValue()),fileSource); 
		    }
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
	mailSender.send(message);
}
public static void main(String[] args) {
	String[] email = {"xxx@xx.com"};
	String title = "测试标题";
	String content = "测试内容";
	String files = "E:/ceshi.pdf";
	Map<String,String> map = new HashMap<String, String>();
	map.put(files, "测试附件.pdf");
	sendEmail(email, title, content, map);
}

******************************************************************************************************

******************************************************************************************************

//封装的EmailInfo类，如有需要请关注一下代码：

import java.util.Arrays;


public class EmailInfo {

	//邮件标题
	private String title;
	//邮件内容
	private String mailContent;
	//接收人
	private String[] destination;
	//邮件类型
	private int type;
	
	public EmailInfo(){
		
	}
	
	public EmailInfo(String title,String mailContent,String[] destination){
		this.title = title;
		this.mailContent = mailContent;
		this.destination = destination;
	}
	
	public EmailInfo(String title,String mailContent,String[] destination,int type){
		this.title = title;
		this.mailContent = mailContent;
		this.destination = destination;
		this.type = type;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getMailContent() {
		return mailContent;
	}

	public void setMailContent(String mailContent) {
		this.mailContent = mailContent;
	}

	public String[] getDestination() {
		return destination;
	}

	public void setDestination(String[] destination) {
		this.destination = destination;
	}

	public int getType() {
		return type;
	}

	public void setType(int type) {
		this.type = type;
	}

	@Override
	public String toString() {
		return "EmailInfo [title=" + title + ", mailContent=" + mailContent + ", destination="
				+ Arrays.toString(destination) + ", type=" + type + "]";
	}
}