java網頁控制項

❶ 如何創建自定義的java Web控制項

有倆中控制項 第一種就是tld標簽，第二種 tag標簽，tag標簽類似一個單獨的jsp文件，可實現公用，例如：
<%@ tag pageEncoding="UTF-8"%>
<%@ attribute name="title" type="java.lang.String" required="false"%>
<%@ attribute name="basePath" type="java.lang.String" required="false"%>
<%@ taglib prefix="tag" tagdir="/WEB-INF/tags" %>
<%@ include file="/common/taglib.jsp"%>
<jsp:doBody/>
</body>
</html>
這就是一個tag標簽，文件名就是控制項名，必須放在/WEB-INF/tags下
需要導入<%@ taglib prefix="tag" tagdir="/WEB-INF/tags" %> 才可使用 <tag:文件名></..>
tld標簽去參考jstl標簽，也很簡單各有用途

❷ 什麼是java控制項怎樣使用java控制項

import Java.util.Date;
import java.util.Calendar;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.text.ParseException ;
import java.awt.Color ;
import java.awt.Font;
import java.awt.Point ;
import java.awt.Dimension ;
import java.awt.BorderLayout ;
import java.awt.FlowLayout ;
import java.awt.GridLayout ;
import java.awt.Component ;
import java.awt.Cursor ;
import java.awt.Frame ;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
//import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.jspinner ;
import javax.swing.JSpinner.NumberEditor ;
import javax.swing.SpinnerNumberModel;
import javax.swing.SwingUtilities;
import javax.swing.SwingConstants ;
import javax.swing.event.ChangeListener ;
import javax.swing.event.ChangeEvent ;
import javax.swing.border.LineBorder ;

public class DateChooserJButton extends JButton {

private DateChooser dateChooser =null;

private String preLabel ="" ;

public DateChooserJButton() {
this(getNowDate()) ;
}

public DateChooserJButton(SimpleDateFormat df , String dateString) {
this() ;
setText(df,dateString) ;
}

public DateChooserJButton(Date date) {
this("",date);
}

public DateChooserJButton(String preLabel , Date date) {
if (preLabel!=null) this.preLabel = preLabel ;
setDate(date) ;
setBorder(null) ;
setCursor(new Cursor(Cursor.HAND_CURSOR)) ;
super.addActionListener( new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (dateChooser==null) dateChooser = new DateChooser();
Point p = getLocationOnScreen() ;
p.y = p.y+30 ;
dateChooser.showDateChooser(p) ;
}
}) ;
}

private static Date getNowDate() {
return Calendar.getInstance().getTime() ;
}

private static SimpleDateFormat getDefaultDateFormat() {
return new SimpleDateFormat("yyyy年MM月dd日HH時") ;
}

//覆蓋父類的方法
public void setText(String s) {
Date date ;
try {
date = getDefaultDateFormat().parse(s) ;
}catch (ParseException e) {
date = getNowDate() ;
}
setDate(date) ;
}

public void setText(SimpleDateFormat df , String s) {

Date date ;
try {
date = df.parse(s) ;
}catch (ParseException e) {
date = getNowDate() ;
}
setDate(date) ;
}

public void setDate(Date date) {
super.setText(preLabel+getDefaultDateFormat().format(date));
}

public Date getDate() {
String dateString = getText().substring(preLabel.length());
try {
return getDefaultDateFormat().parse(dateString);
} catch (ParseException e) {
return getNowDate() ;
}

}

//覆蓋父類的方法使之無效
public void addActionListener(ActionListener listener ) {
}

private class DateChooser extends JPanel implements ActionListener ,ChangeListener {
int startYear = 1980; //默認【最小】顯示年份
int lastYear = 2050; //默認【最大】顯示年份
int width = 200; //界面寬度
int height = 200; //界面高度

Color backGroundColor = Color.gray; //底色
//月歷表格配色----------------//
Color palletTableColor = Color.white; //日歷表底色
Color todayBackColor = Color.orange; //今天背景色
Color weekFontColor = Color.blue; //星期文字色
Color dateFontColor = Color.black; //日期文字色
Color weekendFontColor = Color.red; //周末文字色

//控制條配色------------------//
Color controlLineColor = Color.pink; //控制條底色
Color controlTextColor = Color.white; //控制條標簽文字色

Color rbFontColor = Color.white; //RoundBox文字色
Color rbBorderColor = Color.red; //RoundBox邊框色
Color rbButtonColor = Color.pink; //RoundBox按鈕色
Color rbBTFontColor = Color.red; //RoundBox按鈕文字色

JDialog dialog ;
JSpinner yearSpin ;
JSpinner monthSpin ;
JSpinner hourSpin ;
JButton[][] daysButton = new JButton[6][7] ;

DateChooser() {

setLayout(new BorderLayout());
setBorder(new LineBorder(backGroundColor, 2));
setBackground(backGroundColor);

JPanel topYearAndMonth = createYearAndMonthPanal();
add(topYearAndMonth,BorderLayout.NORTH);
JPanel centerWeekAndDay = createWeekAndDayPanal();
add(centerWeekAndDay,BorderLayout.CENTER);

}

private JPanel createYearAndMonthPanal(){
Calendar c = getCalendar() ;
int currentYear =c.get(Calendar.YEAR);
int currentMonth =c.get(Calendar.MONTH)+1;
int currentHour =c.get(Calendar.HOUR_OF_DAY);

JPanel result = new JPanel();
result.setLayout(new FlowLayout());
result.setBackground(controlLineColor);

yearSpin = new JSpinner(new SpinnerNumberModel(currentYear,startYear,lastYear,1));
yearSpin.setPreferredSize(new Dimension(48,20)) ;
yearSpin.setName("Year") ;
yearSpin.setEditor(new JSpinner.NumberEditor(yearSpin, "####")) ;
yearSpin.addChangeListener(this) ;
result.add(yearSpin) ;

JLabel yearLabel = new JLabel("年");
yearLabel.setForeground(controlTextColor);
result.add(yearLabel);

monthSpin = new JSpinner(new SpinnerNumberModel(currentMonth,1,12,1));
monthSpin.setPreferredSize(new Dimension(35,20)) ;
monthSpin.setName("Month") ;
monthSpin.addChangeListener(this) ;

result.add(monthSpin) ;

JLabel monthLabel = new JLabel("月");
monthLabel.setForeground(controlTextColor);
result.add(monthLabel);

hourSpin = new JSpinner(new SpinnerNumberModel(currentHour,0,23,1));
hourSpin.setPreferredSize(new Dimension(35,20)) ;
hourSpin.setName("Hour") ;
hourSpin.addChangeListener(this) ;
result.add(hourSpin) ;

JLabel hourLabel = new JLabel("時");
hourLabel.setForeground(controlTextColor);
result.add(hourLabel);

return result ;
}

private JPanel createWeekAndDayPanal() {
String colname[] = {"日","一","二","三","四","五","六"};
JPanel result = new JPanel();
//設置固定字體，以免調用環境改變影響界面美觀
result.setFont(new Font("宋體", Font.PLAIN, 12));

result.setLayout(new GridLayout(7,7));
result.setBackground(Color.white);
JLabel cell ;

for(int i=0;i<7;i++) {
cell = new JLabel(colname[i]);
cell.setHorizontalAlignment(JLabel.RIGHT);
if (i==0 i==6) cell.setForeground(weekendFontColor) ;
else cell.setForeground(weekFontColor) ;
result.add(cell) ;
}

int actionCommandId = 0 ;
for(int i = 0; i < 6; i++)
for(int j = 0; j < 7; j++) {
JButton numberButton = new JButton();
numberButton.setBorder(null) ;
numberButton.setHorizontalAlignment(SwingConstants.RIGHT);
numberButton.setActionCommand(String.valueOf(actionCommandId)) ;
numberButton.addActionListener(this) ;
numberButton.setBackground(palletTableColor);
numberButton.setForeground(dateFontColor) ;
if (j==0 j==6) numberButton.setForeground(weekendFontColor) ;
else numberButton.setForeground(dateFontColor) ;
daysButton[i][j] = numberButton;
result.add(numberButton) ;
actionCommandId ++ ;
}

return result;
}

private JDialog createDialog(Frame owner ) {
JDialog result = new JDialog(owner,"日期時間選擇",true) ;
result.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE);
result.getContentPane().add(this,BorderLayout.CENTER) ;
result.pack() ;
result.setSize(width, height);
return result ;
}

void showDateChooser(Point position ) {
Frame owner =(Frame)SwingUtilities.getWindowAncestor(DateChooserJButton.this) ;
if (dialog==null dialog.getOwner()!= owner) dialog = createDialog(owner ) ;
dialog.setLocation(getAppropriateLocation(owner ,position ) ) ;
flushWeekAndDay() ;
dialog.show();
}

Point getAppropriateLocation(Frame owner ,Point position ) {
Point result = new Point(position) ;
Point p = owner.getLocation() ;
int offsetX = (position.x+width) - (p.x + owner.getWidth() ) ;
int offsetY = (position.y+height) - (p.y + owner.getHeight() ) ;

if (offsetX >0 ) {
result.x -= offsetX ;
}

if (offsetY >0 ) {

result.y -= offsetY ;
}

return result ;

}

private Calendar getCalendar() {
Calendar result = Calendar.getInstance();
result.setTime(getDate()) ;
return result ;
}

private int getSelectedYear() {
return ((Integer)yearSpin.getValue()).intValue() ;
}

private int getSelectedMonth() {
return ((Integer)monthSpin.getValue()).intValue() ;
}

private int getSelectedHour() {
return ((Integer)hourSpin.getValue()).intValue() ;
}

private void dayColorUpdate(boolean isOldDay) {
Calendar c = getCalendar() ;
int day = c.get(Calendar.DAY_OF_MONTH);
c.set(Calendar.DAY_OF_MONTH,1);
int actionCommandId =day-2+c.get(Calendar.DAY_OF_WEEK) ;
int i = actionCommandId/7;
int j = actionCommandId%7;
if (isOldDay) daysButton[i][j].setForeground(dateFontColor) ;
else daysButton[i][j].setForeground(todayBackColor) ;
}

private void flushWeekAndDay() {
Calendar c = getCalendar() ;
c.set(Calendar.DAY_OF_MONTH,1);
int maxDayNo = c.getActualMaximum(Calendar.DAY_OF_MONTH);
int dayNo = 2 - c.get(Calendar.DAY_OF_WEEK) ;
for(int i = 0; i < 6; i++) {
for(int j = 0; j < 7; j++) {
String s="" ;
if (dayNo>=1 && dayNo<=maxDayNo ) s = String.valueOf(dayNo) ;
daysButton[i][j].setText(s) ;
dayNo ++ ;
}
}
dayColorUpdate(false) ;
}

public void stateChanged(ChangeEvent e) {
JSpinner source =(JSpinner)e.getSource() ;
Calendar c = getCalendar() ;
if (source.getName().equals("Hour")) {
c.set(Calendar.HOUR_OF_DAY, getSelectedHour());
setDate(c.getTime());
return ;
}

dayColorUpdate(true) ;

if (source.getName().equals("Year"))
c.set(Calendar.YEAR, getSelectedYear());
else
// (source.getName().equals("Month"))
c.set(Calendar.MONTH, getSelectedMonth()-1);
setDate(c.getTime());
flushWeekAndDay() ;
}

public void actionPerformed(ActionEvent e) {
JButton source =(JButton)e.getSource() ;
if (source.getText().length()==0) return ;
dayColorUpdate(true) ;
source.setForeground(todayBackColor) ;
int newDay = Integer.parseInt(source.getText());
Calendar c = getCalendar() ;
c.set(Calendar.DAY_OF_MONTH,newDay);
setDate(c.getTime());
}

}

}

❸ java web項目調用ocx控制項

是的，ocx插件就是必須每台使用的電腦都必須安裝ocx插件，所以你需要提供一個ocx插件的下載地址，讓每個使用的用戶下載這個插件；而且ocx插件的局限性不僅於此，ocx插件對瀏覽器也有限制，比如：ocx插件只支持系統自帶的IE低版本的瀏覽器，其他廠商的瀏覽器基本都不支持