Java : Email setting

boolean sessionDebug = false;
InternetAddress[] address;

//設定所要用的Mail伺服器和所使用的傳輸協定
java.util.Properties props = System.getProperties();
props.put("mail.host","202.203.201.11");
props.put("mail.transport.protocol","smtp");

//產生新的maill session
javax.mail.Session mailSession = javax.mail.Session.getDefaultInstance(props,null);
mailSession.setDebug(sessionDebug);
MimeMessage msg = new MimeMessage(mailSession);

//設定傳送郵件的發信人
msg.setFrom(new InternetAddress("ccccxxx@gmail.com","USERNAME"));

//設定收信人的信箱
address = InternetAddress.parse(sendmail,false);
msg.setRecipients(Message.RecipientType.TO, address);

//設定郵件主題
msg.setSubject(sub,"BIG5");

//設定發信時間
msg.setSentDate(new java.util.Date());

//設定郵件內容
Multipart mp = new MimeMultipart();
MimeBodyPart mbp = new MimeBodyPart();

//設定傳送信的MIME Type
mbp.setContent(message,"text/html;charset=Big5");
mp.addBodyPart(mbp);
msg.setContent(mp);

//傳送郵件
Transport.send(msg);

Java : 讀取目錄下所有CSV檔案內資料 (get all CSV date in same folder)

public class csv {

public static void main(String[] args)
{

FileReader fr = null;

  File dir = new File("F:/log");
  File[] files = dir.listFiles();

  try
  {
    if(files != null)
    {
        for (int i = 0; i < files.length; i++)
      {

        String filePath = files[i].getAbsolutePath().toLowerCase().trim();
        String filename=files[i].getName();

        int startIndex = filename.lastIndexOf('.') + 1;

        String  fcsv = filename.substring(startIndex);
      System.out.println( "fcsv    :"+fcsv );

        if(fcsv.equals("csv"))
        {

          System.out.println(filePath);
          System.out.println( "filesName():"+filename );

          fr = new FileReader(filePath);

            //放到BufferedReader一筆筆讀出
          BufferedReader br = new BufferedReader(fr);

          ArrayList taglist = new ArrayList(getTagList(br));

          for(int k=0; k<taglist.size(); k++)
           {

            System.out.println( k+":" );
            System.out.println(  ((String[])taglist.get(k))[0]);
            System.out.println(  ((String[])taglist.get(k))[1]);
             System.out.println(  ((String[])taglist.get(k))[2]);
            System.out.println(  ((String[])taglist.get(k))[3]);
            System.out.println( "--------" );
            }

          br.close();
        }
        }

  }
} catch (Exception e) {
    e.printStackTrace();
}

}

  public static ArrayList getTagList (BufferedReader br)
  {
    ArrayList taglist = new ArrayList();
    String sData = null;
    try
    {

      while ((sData = br.readLine()) != null)
      {
        String strArray[] = sData.split(",");
        taglist.add(strArray);
      }
    }
    catch (Exception e){
      e.printStackTrace();
    }
    return taglist;
  }
}

Java : 連結DB2資料庫(connect to DB2 database)

public class connectDb2{

public static void main(String[] args) throws Exception
{

DB_URL = "jdbc:db2://10.10.10.18/XXX";
Class.forName("com.ibm.db2.jcc.DB2Driver");
conn = DriverManager.getConnection(DB_URL, "USER", "PW");

//select
      PreparedStatement preStmt = conn.prepareStatement("Select * from DB2DATA");
ResultSet rs = preStmt.executeQuery();

if(rs.next())
{
String no = rs.getString("NO").toString();
}

//insert
PreparedStatement  preStmt = conn.prepareStatement("insert into DB2DATA");
preStmt.execute();

}

}

Java : 連結access資料庫(connect to MS access database)

public class connectAccess{

public static void main(String[] args) throws Exception
{
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
      //access 路徑
      String str1="jdbc:odbc:DRIVER=Microsoft Access Driver(*.mdb);DBQ=C:/acc.mdb";

      Connection conn=DriverManager.getConnection(str1,"","");
      Statement stmt = conn.createStatement();
      ResultSet rs;

      try
     {
         //select
         rs = stmt.executeQuery("select *  from  data" );
         while(rs.next())
         {
            String no=rs.getString("NO").toString();
         }
       
         //insert
         stmt.executeUpdate("insert into data");
       
         //update
         stmt.executeUpdate("update data set NO=''");

      } catch (Exception e) {
         e.printStackTrace();
     }finally{
          stmt.close();
          conn.close();
      }
}

}

Java : 日期加減 (data addition and subtraction)

java.util.*
java.text.*


Calendar cal = Calendar.getInstance();

cal.add(Calendar.MONTH, -6); // 月份減6個月
cal.add(Calendar.MONTH,+3); // 月份加3個月
cal.add(Calendar.YEAR ,  ±N); // 年加減N個月
cal.add(Calendar.NOUR ,  ±N); // 時間加減N小時

String toDay =new SimpleDateFormat("yyyyMMdd").format(cal.getTime()) ;


//---------------------------------------------------------------//

由資料庫或字串日期 轉成date

String  fromDate = "20130801" ;  //由資料庫來或字串日期

SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
Date pDate =new Date();
pDate = df.parse( fromDate  );

cal.setTime(pDate);
cal.add(Calendar.DATE ,  1);  //日期加減方式同上

Java : SimpleDateFormat

SimpleDateFormat("yyyyMMdd")  :  20130315

SimpleDateFormat("HHmmss")  : 111230 (24小時制)

SimpleDateFormat("hhmmss")  :  231230  (12小時制)

Java : 使用http下載時 中文檔名無法顯示

java code :

String filename ="down.csv";
filename = new String(filename.getBytes("Big5"), "ISO8859_1" ) ;