jsp如何把周日改为周一为第一天编日历

<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" import="java.util.*" %>
<%!
String year;
String month;
%>
<%
month=request.getParameter("month");
year=request.getParameter("year");
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
<title>日历</title>
<script language="JavaScript">

</script>
</head>
<%!
String days[];
%>
<%
days=new String[42];
for(int i=0;i<42;i++)
days[i]=" ";
%>
<%
Calendar thisMonth=Calendar.getInstance();
if(month!=null&&(!month.equals("null")))
thisMonth.set(Calendar.MONTH,Integer.parseInt(month));
if(year!=null&&(!year.equals("null")))
thisMonth.set(Calendar.YEAR,Integer.parseInt(year));
year=String.valueOf(thisMonth.get(Calendar.YEAR));
month=String.valueOf(thisMonth.get(Calendar.MONTH));
thisMonth.setFirstDayOfWeek(Calendar.SUNDAY);
thisMonth.set(Calendar.DAY_OF_MONTH,1);
int firstIndex=thisMonth.get(Calendar.DAY_OF_WEEK)-1;
int maxIndex=thisMonth.getActualMaximum(Calendar.DAY_OF_MONTH);
for(int i=0;i<maxIndex;i++)
days[firstIndex+i]=String.valueOf(i+1);
%>
<body>
<form name="sm" method="post" action="Calendar.jsp">
<%=year%>年<%=Integer.parseInt(month)+1%>月
<table border="0" width="168" height="81">
<div align=center>
<tr>
<th width="25" height="16" bgcolor="#FFFF00"><font color="red">日</font></th>
<th width="25" height="16" bgcolor="#FFFF00">一</th>
<th width="25" height="16" bgcolor="#FFFF00">二</th>
<th width="25" height="16" bgcolor="#FFFF00">三</th>
<th width="25" height="16" bgcolor="#FFFF00">四</th>
<th width="25" height="16" bgcolor="#FFFF00">五</th>
<th width="25" height="16" bgcolor="#FFFF00"><font color="green">六</font></th>
</tr>
<%
for(int j=0;j<6;j++)
{
%>
<tr>
<%
for(int i=j*7;i<(j+1)*7;i++)
{
%>