import?java.text.ParseException;

import?java.text.SimpleDateFormat;

import?java.util.Date;

public?class?TypeHelper?{

/**

*?功能：檢查字符串是否為數字

*?

*?@param?需要檢查的字符串

*?@return?boolean

*/

public?static?boolean?isNumeric(String?str)?{

if?(str?==?null?||?str?==?"")

return?false;

for?(int?i?=?str.length();?--i?>=?0;)?{

if?(!Character.isDigit(str.charAt(i)))?{

return?false;

}

}

return?true;

}

/**

*?功能：檢查字符是否為空

*?

*?@param?需要檢查的字符串

*?@return?非空返回本身?空則返回?""

*/

public?static?String?ReturnNull(String?str)?{

if?(str?==?null)?{

return?"";

}?else?{

return?str;

}

}

/**

*?功能：轉化字符串為數字

*?

*?@param?需要轉的字符串

*?@return?返回字符串的數值，如果非數字格式則返回?0

*/

public?static?int?getNumeric(String?str)?{

try?{

return?Integer.parseInt(str);

}?catch?(NumberFormatException?e)?{

return?0;

}

}

/**

*?功能：檢查字符串是否為YYYY—MM-DD?格式

*?

*?@return?boolean

*/

public?static?boolean?isDateString(String?s)?{

SimpleDateFormat?sdf?=?new?SimpleDateFormat("yyyy-MM-dd");

if?(null?==?s)

return?false;

else?{

try?{

return?s.equals(sdf.format(sdf.parse(s)));

}?catch?(ParseException?e)?{

return?false;

}

}

}

/**

*?功能：過濾非法參數參數

*?

*?@return?新字符串

*/

public?static?String?checkInj(String?str)?{

if?(str?==?null)

return?"";

String?inj_str?=?"'|and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|;|-|+|,";//?這里的東西還可以自己添加

String[]?inj_stra?=?inj_str.split("\\|");

for?(int?i?=?0;?i?<?inj_stra.length;?i++)?{

if?(str.indexOf(inj_stra[i])?>=?0)?{

str?=?str.replace(inj_stra[i],?"");

}

}

return?str;

}

/**

*?功能：取當前日期字符串

*?

*?@param?需要檢查的字符串

*?@return?格式?YYYY-MM-dd

*/

public?static?String?getTodayDate()?{

return?new?java.text.SimpleDateFormat("yyyy-MM-dd").format(new?Date());

}

}

//******************************************************************************************************************

public?class?TypeChange?{

//change?the?string?type?to?the?int?type?

public?static?int?stringToInt(String?intstr)?

{?

Integer?integer;?

integer?=?Integer.valueOf(intstr);?

return?integer.intValue();?

}?

//change?int?type?to?the?string?type?

public?static?String?intToString(int?value)?

{?

Integer?integer?=?new?Integer(value);?

return?integer.toString();?

}?

//change?the?string?type?to?the?float?type?

public?static?float?stringToFloat(String?floatstr)?

{?

Float?floatee;?

floatee?=?Float.valueOf(floatstr);?

return?floatee.floatValue();?

}?

//change?the?float?type?to?the?string?type?

public?static?String?floatToString(float?value)?

{?

Float?floatee?=?new?Float(value);?

return?floatee.toString();?

}?

//change?the?string?type?to?the?sqlDate?type?

public?static?java.sql.Date?stringToDate(String?dateStr)?

{?

return?java.sql.Date.valueOf(dateStr);?

}?

//change?the?sqlDate?type?to?the?string?type?

public?static?String?dateToString(java.sql.Date?datee)?

{?

return?datee.toString();?

}?

public?static?void?main(String[]?args)?

{?

java.sql.Date?day?;?

day?=?TypeChange.stringToDate("2003-11-3");?

String?strday?=?TypeChange.dateToString(day);?

System.out.println(strday);?

}?

}

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