在jsp中得到当前月份的第一天与最后一天(急)解决办法

       Calendar c = Calendar.getInstance();       //第一天        c.set(Calendar.DATE,1);       //最后一天        int max = c.getActualMaximum(Calendar.DATE);       c.set(Calendar.DATE,max);
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用javascript控制一下啊  
function changDate(theStr){
  var returnStr;
var the5Str;
the5Str = theStr.subSring(5);
  if(theStr != null && theStr != ""){
   if(the5Str  != "02"){
     if(the5Str=="1"  || the5Str ="3" || the5Str ="5"|| the5Str ="7"||  
the5Str ="8"|| the5Str ="10" || the5Str ="12"){
      returnStr = theStr +"01-"+theStr+"30"
}else{
  returnStr = theStr +"01-"+theStr+"31"
}
    
}else{
 returnStr = theStr +"01-"+theStr+"29"
}
  
}

}
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JScript code
var myDate= new Date();var s1 = myDate.getYear() + "-" + myDate.getMonth + "-01";//第一天var s2 = myDate.getYear() + "-" + myDate.getMonth + "-" + myDate.getDate();//最后一天
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更正：
JScript code
var myDate= new Date();var s1 = myDate.getYear() + "-" + myDate.getMonth() + "-01";//第一天var s2 = myDate.getYear() + "-" + myDate.getMonth() + "-" + myDate.getDate();//最后一天
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膜拜LZ
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Java code
       Calendar c = Calendar.getInstance();
       //第一天
        c.set(Calendar.DATE,1);
       //最后一天
        int max = c.getActualMaximum(Calendar.DATE);
       c.set(Calendar.DATE,max);

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Java code
package com.dm.sck.action.audit;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class A{    /**      * 给一个日期，根据这个日期该日期月的起止日期      * @throws ParseException       *       */     public static void main(String[] args) throws ParseException     {     // TODO Auto-generated method stub                           Calendar cal = A.transStringToCalendar("yyyy-MM-dd", "2009-12-15");        int maxdate = cal.getActualMaximum(Calendar.DATE);           int mindate = cal.getActualMinimum(Calendar.DATE);                      cal.set(Calendar.DATE, maxdate);        Date max = cal.getTime();                String maxStr = A.transDateToString("yyyy-MM-dd",  max);        System.out.println("最大日期： " + maxStr);                cal.set(Calendar.DATE, mindate);        Date min = cal.getTime();                String minStr = A.transDateToString("yyyy-MM-dd", min);        System.out.println("最小日期： " + minStr);                  }          /**      * 将data转为string      *      */     public static String transDateToString(String format, Date date) {      if (date == null)       return " ";      SimpleDateFormat sdf = new SimpleDateFormat(format);      return sdf.format(date);     }           /**      * 将string转为Calendar      *      */     public static Calendar transStringToCalendar(String format, String str_date) throws ParseException {           SimpleDateFormat sdf = new SimpleDateFormat(format);      java.util.Date d = sdf.parse(str_date);      Calendar cal = Calendar.getInstance();      cal.setTime(d);      return cal;     }}