StaticClass

package org.onepiece;

import java.text.SimpleDateFormat;
import java.util.Date;

public class StaticClass
{

    public final static String EmptyString = "";

    public final static String MD5 = "MD5";
    public final static String SHA1 = "SHA1";
    public final static String SHA256 = "SHA256";
    public final static String SHA384 = "SHA384";
    public final static String SHA512 = "SHA512";

    public final static String UTF8 = "UTF-8";
    public final static String Unicode = "Unicode";
    public final static String GB2312 = "GB2312";
    public final static String ASCII = "ASCII";
    public final static String GBK = "GBK";


    public final static String yyyy_MM_dd_HH_mm_ss = "yyyy-MM-dd HH:mm:ss";
    public final static String yyyy_MM_dd = "yyyy-MM-dd";
    public final static String HH_mm_ss = "HH:mm:ss";

    public final static int defaultInt = 0;
    public final static long defaultLong = 0L;
    public final static double defaultDouble = 0.0d;


    public final static String mySqlDriver = "com.mysql.jdbc.Driver";
    public final static String mySqlURL = "jdbc:mysql://localhost:3306/";

    public final static String WindowsNewLine = "\n";
    public final static String NewLine = "\r\n";


    //指示指定的字符串是 null 还是 Empty 字符串
    public static boolean StringIsNullOrEmpty(String str)
    {
        if (str==null || str.isEmpty()) { return true; }

        return false;
    }

    //指示指定的字符串是 null、空还是仅由空白字符组成
    public static boolean StringIsNullOrWhiteSpace(String str)
    {
        if (str==null || str.isEmpty()) { return true; }
        if (str.trim().length()==0) { return true; }

        return false;
    }

    public static String GetStringOrDefault(String str)
    {
        return GetStringOrDefault(str,"");
    }
    public static String GetStringOrDefault(String str, String defaultValue)
    {
        return StringIsNullOrWhiteSpace(str) ? defaultValue : str;
    }

    //比较字符串,忽略大小写
    public static boolean StringCompare(String str1, String str2)
    {
       if(StringIsNullOrWhiteSpace(str1) || StringIsNullOrWhiteSpace(str2)) { return  false;}
       return str1.equalsIgnoreCase(str2);
    }
    //比较字符串,忽略大小写(包括比较NULL值)
    public static boolean StringCompareIncludeNull(String str1, String str2)
    {
        return GetStringOrDefault(str1).equalsIgnoreCase(GetStringOrDefault(str2));
    }



    /*
        String str = "13147306612";

        String result = HideString(str,3,4);
        printIn(result);

        str = "445321198707051030";
        result = HideString(str,3,4);
        printIn(result);
    */
    public static String HideString(String str, int startShowCount, int endShowCount) throws  Exception
    {
        return HideString(str, startShowCount, endShowCount, "*");
    }

    public static String HideString(String str, int startShowCount, int endShowCount, String symbol) throws Exception
    {
        if (StringIsNullOrWhiteSpace(str) == false && str.length() > (startShowCount + endShowCount))
        {
            StringBuilder builder = new StringBuilder();
            builder.append(str.substring(0, startShowCount));

            int count = str.length() - startShowCount - endShowCount;
            for (int i = 0; i < count; i++)
            {
                builder.append(symbol);
                //builder.Append("*");
            }

            //builder.append(str.substring(str.length() - endShowCount, endShowCount)); //C#
            builder.append(str.substring(str.length()-endShowCount,str.length()));//从多少到多少

            return builder.toString();
        }

        return str;
    }

    public static String getDateTimeString(Date date, String format)
    {
        if(StringIsNullOrWhiteSpace(format)) { format="yyyy-MM-dd HH:mm:ss"; }

        SimpleDateFormat sdf = new SimpleDateFormat(format);
        String dtString = sdf.format(date);
        return dtString;
    }

}