Cómo definir un Filter-mapping de forza efectiva y eficaz

Señor@s, esto no es serio... De nuevo, no intenten hacer estos en sus casas...

<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/A*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/B*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/C*</url-pattern></filter-mapping>
(...)
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/X*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/Y*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/Z*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/a*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/b*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/c*</url-pattern></filter-mapping>
(...)
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/x*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/y*</url-pattern></filter-mapping>
<filter-mapping><filter-name>xxxxFilter</filter-name><url-pattern>/z*</url-pattern></filter-mapping>
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La semana surreal

Cómo obtener un String formado por "Semana " y el número de semana en el año.
Señor@s, no intenten hacer esto en sus casas.

(...)
String[] vals = (String[])params.get(i);
int sem = Integer.parseInt(vals[0]);
int semdif = sem-semanaIni;
if(semdif==0) {
  semana= "Semana 1";
} else {
  if(sem>semanaIni){
  semdif = semdif + 1;
  semana = "Semana " + semdif;
} else {
  semdif = (52 - semanaIni) + sem;
  semdif = semdif + 1;
  semana = "Semana " + semdif;
}
(...)
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