Some useful common JAVA methods (1)

<%!

File: // get the machine name or IP address

String get_Myhostname (javax. servlet. http. HttpServletRequest request ){

String myhostname = null;

Try {

Myhostname = request. getRemoteHost ();

Myhostname = myhostname. toUpperCase ();

} Catch (Exception e ){}

Return myhostname;

}

File: // process an empty string

String dealNull (String str ){

String returnstr = null;

If (str = null) returnstr = "";

Else returnstr = str;

Return returnstr;

}

File: // process empty objects

Object dealNull (Object obj ){

Object returnstr = null;

If (obj = null) returnstr = (Object )("");

Else returnstr = obj;

Return returnstr;

}

Int dealEmpty (String s ){

S = dealNull (s );

If (s. equals ("") return 0;

Return Integer. parseInt (s );

}

String replace (String str, String substr, String restr ){

String [] tmp = split (str, substr );

String returnstr = null;

If (tmp. length! = 0 ){

Returnstr = tmp [0];

For (int I = 0; I <tmp. length-1; I ++)

Returnstr = dealNull (returnstr) + restr + tmp [I + 1];

}

Return dealNull (returnstr );

}

String htmlEncode (String txt ){

Txt = replace (txt ,"&","&");

Txt = replace (txt ,"&","&");

Txt = replace (txt ,""",""");

Txt = replace (txt ,""",""");

Txt = replace (txt, "<", "<");

Txt = replace (txt, "<", "<");

Txt = replace (txt, ">", "> ");

Txt = replace (txt, ">", "> ");

Txt = replace (txt ,"","");

Txt = replace (txt ,"","");

Return txt;

}

String unHtmlEncode (String txt ){

Txt = replace (txt ,"&","&");

Txt = replace (txt ,""",""");

Txt = replace (txt, "<", "<");

Txt = replace (txt, ">", "> ");

Txt = replace (txt ,"","");

Return txt;

}

File: // ALERT Function

Void sAlert (String title, String msg, String focus, JspWriter out ){

Try {

Out. println ("<" script language = javascript "> ");

Out. println ("alert (" "+ title +" "+"

"+" "+ Replace (msg,", "),", ") + "");");

Out. println (focus );

Out. println ("");

} Catch (Exception e) {System. out. println (e );}

}

File: // CONFIRM Function

Void sConfirm (String title, String msg, String location, JspWriter out ){

Try {

Out. println ("<" script language = javascript "> ");

Out. println ("if (confirm (" "+ title +" "+"

"+" "+ Replace (msg," ",") + "")){");

Out. println ("var d = (new Date (). toString ();");

Out. println (location + "+ d ;");

Out. println ("}");

Out. println ("parent.doc ument. form1.text1. select ();");

Out. println ("");

} Catch (Exception e ){}

}

File: // get the string length

Int getStringLength (String s ){

Int p = 0;

Try {

Int iLength = 0;

Int irealLength = 0;

Int j = 0;

P = s. getBytes ("Shift_JIS"). length;

} Catch (java. io. UnsupportedEncodingException e ){}

Return p;

}

Void formatString (String s, int B, JspWriter out ){

B --;

String t = "";

Try {

Int leng = getStringLength (s );

Int j = 0;

If (leng> B ){

For (int I = 1; I <= B; I ++ ){

T = s. substring (0, I );

If (t. getBytes ("Shift_JIS"). length <= B ){

J ++;

} Else break;

}

File: // j = j + 1;

File: // System. out. println ("B =" + B + "----" + "j =" + j );

For (int I = 0; I <j; I ++ ){

If (s. substring (I, I + 1). equals (""))

Out. print ("");

If (! S. substring (I, I + 1). equals (""))

Out. print (htmlEncode (s. substring (I, I + 1 )));

}

If (s. substring (0, j). getBytes ("Shift_JIS"). length = B ){

Out. print ("| ");

} Else {

Out. print ("| ");

}

} Else {

For (int I = 0; I <B-leng; I ++)

T = t + "";

For (int I = 0; I <s. length (); I ++ ){

If (s. substring (I, I + 1). equals (""))

Out. print ("");