JSP简单小程序，日历

package red.star; import java.time.LocalDate; import java.time.DayOfWeek; public class Calendar { int year ,month ; String saveCalender; //存放日历 public Calendar(){ year = LocalDate.now().getYear(); month = LocalDate.now().getMonthValue(); } public void setYear(int y){ year = y; } public int getYear(){ return year; } public void setMonth(int m){ month = m; if(month>12){ year++; month = 1; } if(month<1){ month = 12; year--; } } public int getMonth(){ return month; } public String getSaveCalender(){ LocalDate date = LocalDate.of(year,month,1); int days = date.lengthOfMonth(); //得到该月有多少天。 int space = 0; //存放空白字符的个数 DayOfWeek dayOfWeek = date.getDayOfWeek(); //得到1号是星期几 switch(dayOfWeek) { case SUNDAY: space = 0; break; case MONDAY: space = 1; break; case TUESDAY: space = 2; break; case WEDNESDAY: space = 3; break; case THURSDAY: space = 4; break; case FRIDAY: space = 5; break; case SATURDAY: space = 6; break; } String [] c = new String[space+days]; for(int i=0;i<space;i++) c[i]="--"; for(int i = space,n=1;i<c.length;i++){ c[i] = String.valueOf(n) ; n++; } String head = "<tr><th>星期日</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> </tr>"; StringBuffer buffer = new StringBuffer(); buffer.append("<table border = 0>"); buffer.append(head); int n = 0; while(n<c.length){ buffer.append("<tr>"); int increment = Math.min(7,c.length-n); for(int i=n;i<n+increment;i++) { buffer.append("<td align= center>"+c[i]+"</td>"); } buffer.append("</tr>"); n = n+increment; } buffer.append("</table>"); saveCalender = new String(buffer); return saveCalender; } }