以下为java代码:

<%@ page import= "java.text.SimpleDateFormat"%>
<%@ page import= "java.util.Calendar"%>
public int use(int reyear, int remonth) {
    Calendar now = Calendar.getInstance(); // 实例化Calendar
    int week_num;
    now.set(reyear, remonth, 1); // 设置时间为所要查询的年月的第一天
    week_num = (int) (now.get(Calendar.DAY_OF_WEEK));// 得到第一天的星期
    return week_num;
}
Calendar now = Calendar.getInstance(); // 实例化Calendar
int year, month_num, first_day_num;
String log[] = { "日", "一", "二", "三", "四", "五", "六" };
month_num = (int) (now.get(Calendar.MONTH)); // 得到当前时间的月份
year = (int) (now.get(Calendar.YEAR)); // 得到当前时间的年份
first_day_num = use(year, month_num);

以下为jsp代码:

<table>
    <thead>
        <tr><td>日</td><td>一</td><td>二</td><td>三</td><td>四</td><td>五</td><td>六</td></tr>
    </thead>
    <tbody>
    <%
    int month_day_score; // 存储月份的天数
    int count;
    month_day_score = 0;
    count = 1;
     java.util.Date date = new  java.util.Date(year, month_num + 1, 1); // now
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.add(Calendar.MONTH, -1); // 前个月
    month_day_score = cal.getActualMaximum(Calendar.DAY_OF_MONTH);// 最后一天   
    int NowDay=1;
    for (int i = 0; i <6; i++) { // 初始化标签%>
    <tr>
    <%
        for (int j = 0; j <7; j++) {
        String nowdate = year+"";
        if((month_num+1)<10){
            nowdate=nowdate+"-"+"0"+(month_num + 1);            
        }else{
            nowdate=nowdate+"-"+(month_num + 1);
        }
        if(NowDay<10){
            nowdate=nowdate+"-"+"0"+NowDay;
        }else{
            nowdate=nowdate+"-"+NowDay;
        }
        if(i==0&&(j+1)<first_day_num){
        %>
            <td date-month="" date-day=""></td>
        <%
        }else{
            if(NowDay<(month_day_score)+1){
                String sign_sql="select count(1) from integraldetail where intime like '%"+nowdate+"%' and uid='"+UID+"' and `remark`='签到' and iid=1 limit 1";
                int exe1 = db.executeCounts(sign_sql);
                //class="current-day"   为选中效果样式
                %>
                <td date-month="<%=(month_num+1)%>" <% if(exe1>0) {%>class="current-day"<%}%> date-day="<%=NowDay%>"><%=NowDay%></td>
                <% 
            }else{
            %>
                <td date-month="" date-day=""></td>
            <%
            }
            NowDay++;
        }
     }%>
    </tr>
    <%}%>
    </tbody>
</table>