Java generates html perpetual calendar

package Str;  
   
import java.util.Calendar;  
/** 
 *  
 *  
 * @project Tool 
 * @type Test8 
 * @Description  
 * @author xuyw 
 * @email xyw10000@163.com 
 * @date 2014-8-9 下午01:45:02 
 * @version 1.0 
 * 
 */ 
public class Test8 {  
   
    /** 
     * @param args 
     */ 
    public static void main(String[] args) {  
        Calendar calendar = Calendar.getInstance();  
        calendar.add(Calendar.MONTH, 0);  
        calendar.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天  
        int firstDay = calendar.get(Calendar.DAY_OF_WEEK) - 1;  
        int monthDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);// 当月最后一天  
   
        StringBuilder sbd = new StringBuilder();  
        sbd.append("<table cellspacing=&#39;0&#39; style=&#39;background: url(./img/body.png);&#39;>");  
        sbd.append("<thead><tr>");  
        sbd  
                .append("<th>星期天</th><th>星期一</th><th>星期二</th><th>星期三</th><th>星期四</th><th>星期五</th><th>星期六</th>");  
        sbd.append("</tr></thead>");  
        sbd.append("<tbody><tr>");  
        // 第一行  
        int weekend = 0;// 每周的最后一天的日期  
        for (int i = 0; i < 7; i++) {  
            if (i < firstDay) {  
                sbd.append("<td></td>");  
            } else {  
                sbd.append("<td>" + (i - firstDay + 1) + "</td>");  
            }  
            weekend = i - firstDay + 1;  
        }  
        sbd.append("</tr>");  
        while (weekend < monthDays) {  
            sbd.append("<tr>");  
   
            for (int i = 0; i < 7; i++) {  
                if (weekend + i < monthDays)// 数字小于等于当前月的最后一天  
                {  
                    sbd.append("<td>" + (i + weekend + 1) + "</td>");  
                } else {  
                    sbd.append("<td></td>");  
                }  
   
            }  
            sbd.append("</tr>");  
            weekend += 7;// 周末再加7天  
        }  
   
        sbd.append("<tbody></table>");  
        System.out.println(sbd.toString());  
    }  
}

* { 
    /* old-style reset here :) */ 
    border: 0px; 
    padding: 0px; 
} 
body { 
    font-family: Helvetica; 
    background: white; 
    text-align: center; 
    /* background: url(../img/body.png) repeat-x; */} 
body h1 { 
    padding-top: 20px; 
    font-size: 36px; 
    color: #335; 
} 
p{font-size:26px;} 
table { 
    border-collapse: separate; 
    border: 1px solid #9DABCE; 
    border-width: 1px 1px 1px 1px; 
    margin: 10px auto; 
    font-size: 30px; 
} 
   
   
td, th { 
    width: 81px; 
    height: 81px; 
    text-align: center; 
    vertical-align: middle; 
    /*background: url(../img/cells.png);*/ 
    color: #444; 
    position: relative; 
} 
th { 
    height: 30px; 
    font-weight: bold; 
    font-size: 14px; 
} 
   
td.sign_in { 
    background-position: 81px 0px; 
    color: red; 
} 
   
td.sign_no{ 
    background: url(../img/cells.png); 
}