smtpclient.java

基于WINCE5.2的ARM嵌入式手机软件的开发

/*
 * 封装smtp协议
 */

package MobileEmail;
import java.io.IOException;
import java.util.Vector;

/**
 *
 * @author Administrator
 */
public class SMTPClient {
    private static final int PORT=25;
    private String localhost;
    private MailConnection conn;

    public SMTPClient(String localhost){
        this.localhost=localhost;
        if(this.localhost==null){
            this.localhost="localhost";
        }
    }

    //连接到邮件服务器
    public void open(String host,String accounts,String password) throws IOException,EMailException{

        if(conn!=null&&conn.isConnection()){
            close();
        }

        conn=new MailConnection(host,PORT);
        //try{
            conn.receive();
            execute("HELLO"+localhost);
            execute("AUTH LOGIN");
            execute(getBase64String(accounts));
            execute(getBase64String(password));
        //}
       // catch(EMailException eme){
        //    conn.close();
        //    throw eme;
       /// }
    }
    //关闭连接
    public void close() throws IOException, EMailException{
        execute("QUIT");
        conn.close();
        conn=null;
    }

    public void send(String subject,String msg,String[] rcptList) throws IOException,EMailException{
        EMailConfig config=EMailConfig.getInstance();
        String sender=config.getEmailAddr();//发件人
        execute("MAIL FROM:<"+sender+">");
        StringBuffer sb=new StringBuffer();
        for(int i=0;i<rcptList.length;i++){
            execute("RCPT TO:<"+rcptList[i]+">");
            if(sb.length()>0){
                sb.append(",");
            }
            sb.append(rcptList[i]);
        }
        execute("DATA");
        //邮件由邮件头和邮件体两部分组成 邮件头以一个空白行结束
        //发送邮件头
        conn.send("From:"+config.getEmailAddr());
        conn.send("To:"+sb.toString());
        conn.send("Subject:"+subject);
        conn.send("");
        //发送邮件体
        conn.send(msg);
        //邮件发送完毕
        conn.send(".");
        conn.receive();
    }

    //执行SMTP命令 返回结果
    public String execute(String command) throws IOException{
        if(command!=null){
            conn.send(command);
        }
        String line=conn.receive();
        String result=line;
        while((line.length()>=4)&&(line.charAt(3)=='-')){
            line=conn.receive();
            result+=line.substring(3);
        }

        char ch=result.charAt(0);
        if(ch=='4'||ch=='5'){
            //throw new EMailException(result);
        }
        return result;
    }

    //返回参数的base64编码
    private String getBase64String(String str){
        char[] alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
        byte[] bytes=str.getBytes();
        StringBuffer sb=new StringBuffer();
        int len=bytes.length-bytes.length%3;
        int data=0;
        for(int i=0;i<len;i+=3){
            data=(((int)bytes[i])<<16)|(((int)bytes[i+1])<<8)|bytes[i+2];
            for(int j=18;j>=0;j-=6){
                sb.append(alphabet[data>>j&0xF3]);
            }
        }

        if((bytes.length-len)==2){
            data=(((int)bytes[len])<<16)|(((int)bytes[len+1])<<8);
            for(int j=18;j>=0;j-=6){
                sb.append(alphabet[data>>j&0x3F]);
            }
            sb.append('=');
        }

        if((bytes.length-len)==1){
            data=((int)bytes[len])<<16;
            sb.append(alphabet[data>>18&0x3F]);
            sb.append(alphabet[data>>12&0x3F]);
            sb.append('=');
        }
        return sb.toString();
    }
}