JOptionPane 在 Java 中显示 HTML 问题 [英] JOptionPane displaying HTML problems in Java
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问题描述
好的，我有这段代码，它会提示用户一个月和一年，并打印该月的日历.不过我遇到了一些问题.
Okay, so I have this code, it prompts a month and a year from the user and prints the calendar for that month. I'm having some problems though.
- HTML 字体编辑只影响月份.
- 星期几在列中未正确对齐.
谢谢！
package calendar_program;
import javax.swing.JOptionPane;
public class Calendar {
public static void main(String[] args) {
StringBuilder result=new StringBuilder();
// read input from user
int year=getYear();
int month=getMonth();
String[] allMonths={
"", "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
};
int[] numOfDays= {0,31,28,31,30,31,30,31,31,30,31,30,31};
if (month == 2 && isLeapYear(year)) numOfDays[month]=29;
result.append(" "+allMonths[month]+ " "+ year+"
"+" S M Tu W Th F S"+"
");
int d= getstartday(month, 1, year);
for (int i=0; i<d; i++){
result.append(" ");
// prints spaces until the start day
}
for (int i=1; i<=numOfDays[month];i++){
String daysSpace=String.format("%4d", i);
result.append(daysSpace);
if (((i+d) % 7==0) || (i==numOfDays[month])) result.append("
");
}
//format the final result string
String finalresult= "<html><font face='Arial'>"+result;
JOptionPane.showMessageDialog(null, finalresult);
}
//prompts the user for a year
public static int getYear(){
int year=0;
int option=0;
while(option==JOptionPane.YES_OPTION){
//Read the next data String data
String aString = JOptionPane.showInputDialog("Enter the year (YYYY) :");
year=Integer.parseInt(aString);
option=JOptionPane.NO_OPTION;
}
return year;
}
//prompts the user for a month
public static int getMonth(){
int month=0;
int option=0;
while(option==JOptionPane.YES_OPTION){
//Read the next data String data
String aString = JOptionPane.showInputDialog("Enter the month (MM) :");
month=Integer.parseInt(aString);
option=JOptionPane.NO_OPTION;
}
return month;
}
//This is an equation I found that gives you the start day of each month
public static int getstartday(int m, int d, int y){
int year = y - (14 - m) / 12;
int x = year + year/4 - year/100 + year/400;
int month = m + 12 * ( (14 - m) / 12 ) - 2;
int num = ( d + x + (31*month)/12) % 7;
return num;
}
//sees if the year entered is a leap year, false if not, true if yes
public static boolean isLeapYear (int year){
if ((year % 4 == 0) && (year % 100 != 0)) return true;
if (year % 400 == 0) return true;
return false;
}
}
推荐答案
这是一个相当愚蠢的想法.
Here's a rather stupid idea.
而不是使用空格来格式化您的结果，这可能会受到可变宽度字体的各个字体宽度变化的影响...改用 HTML 表格，或 JTable 或 JXMonthView 来自 SwingX 项目
Rather then formatting your results using spaces, which may be affected by variance in the individual font widths of a variable width font...use a HTML table instead, or a JTable, or JXMonthView from the SwingX project
HTML 表格
String dayNames[] = {"S", "M", "Tu", "W", "Th", "F", "S"};
result.append("<html><font face='Arial'>");
result.append("<table>");
result.append("<tr>");
for (String dayName : dayNames) {
result.append("<td align='right'>").append(dayName).append("</td>");
}
result.append("</tr>");
result.append("<tr>");
for (int i = 0; i < d; i++) {
result.append("<td></td>");
}
for (int i = 0; i < numOfDays[month]; i++) {
if (((i + d) % 7 == 0)) {
result.append("</tr><tr>");
}
result.append("<td align='right'>").append(i + 1).append("</td>");
}
result.append("</tr>");
result.append("</table>");
result.append("</html>");
JTable 示例
MyModel model = new MyModel();
List<String> lstRow = new ArrayList<String>(7);
for (int i = 0; i < d; i++) {
lstRow.add("");
}
for (int i = 0; i < numOfDays[month]; i++) {
if (((i + d) % 7 == 0)) {
model.addRow(lstRow);
lstRow = new ArrayList<String>(7);
}
lstRow.add(Integer.toString(i + 1));
}
if (lstRow.size() > 0) {
while (lstRow.size() < 7) {
lstRow.add("");
}
model.addRow(lstRow);
}
JTable table = new JTable(model);
// Kleopatra is so going to kill me for this :(
Dimension size = table.getPreferredScrollableViewportSize();
size.height = table.getRowCount() * table.getRowHeight();
table.setPreferredScrollableViewportSize(size);
JOptionPane.showMessageDialog(null, new JScrollPane(table));
public static class MyModel extends AbstractTableModel {
public static final String[] DAY_NAMES = {"S", "M", "Tu", "W", "Th", "F", "S"};
private List<List<String>> lstRowValues;
public MyModel() {
lstRowValues = new ArrayList<List<String>>(25);
}
@Override
public int getRowCount() {
return lstRowValues.size();
}
@Override
public String getColumnName(int column) {
return DAY_NAMES[column];
}
@Override
public int getColumnCount() {
return 7;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
List<String> rowData = lstRowValues.get(rowIndex);
return rowData.get(columnIndex);
}
public void addRow(List<String> lstValues) {
lstRowValues.add(lstValues);
fireTableRowsInserted(getRowCount(), getRowCount());
}
}
或者你可以去看看JXMonthView
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