使用JavaMail發送郵件的Java類

使用JavaMail發送郵件需要用到mail.jar和activtion.jar兩個包。

該類實現了較完整的郵件發送功能，包括以HTML格式發送，添加附件和抄送人。下面是具體的代碼：

Mail.java：

package cn.cgw.util.mail;  
      
import java.util.Properties;  
      
import javax.activation.DataHandler;  
import javax.activation.FileDataSource;  
import javax.mail.Address;  
import javax.mail.BodyPart;  
import javax.mail.Message;  
import javax.mail.Multipart;  
import javax.mail.Session;  
import javax.mail.Transport;  
import javax.mail.internet.InternetAddress;  
import javax.mail.internet.MimeBodyPart;  
import javax.mail.internet.MimeMessage;  
import javax.mail.internet.MimeMultipart;  
      
      
public class Mail {   
      
    private MimeMessage mimeMsg; //MIME郵件對象   
    private Session session; //郵件會話對象   
    private Properties props; //系統屬性   
    private boolean needAuth = false; //smtp是否需要認證   
    //smtp認證用戶名和密碼   
    private String username;   
    private String password;   
    private Multipart mp; //Multipart對象,郵件內容,標題,附件等內容均添加到其中後再生成MimeMessage對象   
           
    /** 
     * Constructor 
     * @param smtp 郵件發送服務器 
     */
    public Mail(String smtp){   
        setSmtpHost(smtp);   
        createMimeMessage();   
    }   
      
    /** 
     * 設置郵件發送服務器 
     * @param hostName String  
     */
    public void setSmtpHost(String hostName) {   
        System.out.println("設置系統屬性：mail.smtp.host = "+hostName);   
        if(props == null)  
            props = System.getProperties(); //獲得系統屬性對象    
        props.put("mail.smtp.host",hostName); //設置SMTP主機   
    }   
      
      
    /** 
     * 創建MIME郵件對象   
     * @return 
     */
    public boolean createMimeMessage()   
    {   
        try {   
            System.out.println("准備獲取郵件會話對象！");   
            session = Session.getDefaultInstance(props,null); //獲得郵件會話對象   
        }   
        catch(Exception e){   
            System.err.println("獲取郵件會話對象時發生錯誤！"+e);   
            return false;   
        }   
          
        System.out.println("准備創建MIME郵件對象！");   
        try {   
            mimeMsg = new MimeMessage(session); //創建MIME郵件對象   
            mp = new MimeMultipart();   
              
            return true;   
        } catch(Exception e){   
            System.err.println("創建MIME郵件對象失敗！"+e);   
            return false;   
        }   
    }     
          
    /** 
     * 設置SMTP是否需要驗證 
     * @param need 
     */
    public void setNeedAuth(boolean need) {   
        System.out.println("設置smtp身份認證：mail.smtp.auth = "+need);   
        if(props == null) props = System.getProperties();   
        if(need){   
            props.put("mail.smtp.auth","true");   
        }else{   
            props.put("mail.smtp.auth","false");   
        }   
    }   
      
    /** 
     * 設置用戶名和密碼 
     * @param name 
     * @param pass 
     */
    public void setNamePass(String name,String pass) {   
        username = name;   
        password = pass;   
    }   
      
    /** 
     * 設置郵件主題 
     * @param mailSubject 
     * @return 
     */
    public boolean setSubject(String mailSubject) {   
        System.out.println("設置郵件主題！");   
        try{   
            mimeMsg.setSubject(mailSubject);   
            return true;   
        }   
        catch(Exception e) {   
            System.err.println("設置郵件主題發生錯誤！");   
            return false;   
        }   
    }  
          
    /**  
     * 設置郵件正文 
     * @param mailBody String  
     */ 
    public boolean setBody(String mailBody) {   
        try{   
            BodyPart bp = new MimeBodyPart();   
            bp.setContent(""+mailBody,"text/html;charset=GBK");   
            mp.addBodyPart(bp);   
              
            return true;   
        } catch(Exception e){   
        System.err.println("設置郵件正文時發生錯誤！"+e);   
        return false;   
        }   
    }   
    /**  
     * 添加附件 
     * @param filename String  
     */ 
    public boolean addFileAffix(String filename) {   
          
        System.out.println("增加郵件附件："+filename);   
        try{   
            BodyPart bp = new MimeBodyPart();   
            FileDataSource fileds = new FileDataSource(filename);   
            bp.setDataHandler(new DataHandler(fileds));   
            bp.setFileName(fileds.getName());   
                  
            mp.addBodyPart(bp);   
                  
            return true;   
        } catch(Exception e){   
            System.err.println("增加郵件附件："+filename+"發生錯誤！"+e);   
            return false;   
        }   
    }   
          
    /**  
     * 設置發信人 
	 * 查看本欄目
public static void main(String[] args){  
    String smtp = "SMTP服務器";  
    String from = "發信人";  
    String to = "收信人";  
    String copyto = "抄送人";  
    String subject = "郵件主題";  
    String content = "郵件內容";  
    String username="用戶名";  
    String password="密碼";  
    String filename = "附件路徑，如：F:\\筆記<a>\\struts2</a>與mvc.txt";
    Mail.sendAndCc(smtp, from, to, copyto, subject, content, username, password, filename);  
}