1 flaot 取小數(shù)點(diǎn)

?/**
?? * 把傳入的雙精度變量或單精度變量轉(zhuǎn)化為兩位小數(shù)的形式輸出
?? * */
?? public float getInvertDataDouble(float para)
?? {
???? DecimalFormat decimalFormat=new DecimalFormat("0.00");
???? String s=decimalFormat.format(para);
???? float a=Float.parseFloat(s);
???? return a;
?? }
??
2對話框顯示
SwingUtilities.getAncestorOfClass(Frame.class,this)
處理網(wǎng)頁對話框顯示在網(wǎng)頁底下

3字符處理

???? StringTokenizer st = new StringTokenizer(CurveLabel, "%");
???? String[] value = new String[4];
???? int l = 0;
???? while (st.hasMoreElements()) {
??????? value[l] = (String) st.nextElement();
??????? l = l + 1;
???? }
???? String shujuleixing = value[0];
???? String ycxm = value[1];
???? String riqi = value[2];??

4對話框

???????? String message = "已有DSM修正預(yù)測數(shù)據(jù)!";
???????? int result = JOptionPane.showOptionDialog(SwingUtilities.getAncestorOfClass(Frame.class,this), message, title,
???????????? optionType, messageType, null, options, options[1]);
????????????
???????????? dialog
????????????
????????????
????????????
????????????
5布局
?setbounds 只有在布局為null的時(shí)候有用
?setPreferredSize在布局的時(shí)候有用 但是布局器可能自動(dòng)設(shè)置其大小
?可以設(shè)置 setMaximumSize 最大大小

?

6servlet和程序用的不是一個(gè)classes12包
?(1)servlet調(diào)用的class12和程序調(diào)用的class12不一樣 在dafaultroot里
?(2)ldfserver問題主要是 oracle8i 與oracle9i客戶端不兼容 將9i的dll拷到bin目錄下即可

7
?????? if (e.getValueIsAdjusting()) { //list不處理
????????? return;
?????? }

8 setVisible(true/false) 使組件是否可見
?加完以后要重新布一下局.revalidate();

9JCheckBox 可以用addActionListener() 然后在actionperformed里 查看是否isSelected

10 JTable 必須加滾動(dòng)才出列名

11對話框
?? ?? String title="Message Dialog";
?? ?? String message="";
?? ?? int type=JOptionPane.PLAIN_MESSAGE;
?? ?? if (cmd.equals("Show Error Icon")){
?? ?? ?? type=JOptionPane.ERROR_MESSAGE;
?? ?? ?? message="Error Message";
?? ?? }else if (cmd.equals("Show Information Icon")){
?? ?? ?? type=JOptionPane.INFORMATION_MESSAGE;
?? ?? ?? message="information Message";
?? ?? }else if (cmd.equals("Show Waring Icon")){
?? ?? ?? type=JOptionPane.WARNING_MESSAGE;
?? ?? ?? message="Waring Message";
?? ?? }else if (cmd.equals("Show Question Icon")){
?? ?? ?? type=JOptionPane.QUESTION_MESSAGE;
?? ?? ?? message="Question Message";
?? ?? }else if (cmd.equals("Show Plain Icon")){
?? ?? ?? type=JOptionPane.PLAIN_MESSAGE;
?? ?? ?? message="Plain Message";
?? ?? }else if (cmd.equals("Show User Define Icon")){
?? ?? ?? type=JOptionPane.PLAIN_MESSAGE;
?? ?? ?? JOptionPane.showMessageDialog(f,message,title,type,new ImageIcon("..\\icons\\glass.jpg"));
?? ?? ?? return ;
?? ?? }
?? ?? JOptionPane.showMessageDialog(f,message,title,type);

12
??? table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);//自動(dòng)設(shè)置大小 在用滾動(dòng)條的時(shí)候管用
??? table.setColumnSelectionAllowed(true);//設(shè)置選擇模式 行或列

13 list觸發(fā)兩次事件處理
??????? if (e.getValueIsAdjusting()) { //list不處理
????????? return;
?????? }

14 和list里的內(nèi)容進(jìn)行比較
?DefaultListModel getdm=(DefaultListModel) sflist.getModel();
???if(getdm.contains(name))
???{
????type = JOptionPane.ERROR_MESSAGE;
????message = "組合算法名稱已經(jīng)存在！";
????JOptionPane.showMessageDialog(f, message, title, type);
????return;
???}

15進(jìn)度條
?import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class ProgressBartr implements ActionListener {

?/**
? * @param args
? */
?JProgressBar pb = new JProgressBar();

?public static void main(String[] args) {
??// TODO 自動(dòng)生成方法存根
??new ProgressBartr();
?}
?public ProgressBartr() {
??JFrame f = new JFrame();
??Container con=f.getContentPane();
??con.setLayout(new FlowLayout());
??JButton jb=new JButton("button");
??jb.addActionListener(this);
??//pb.setIndeterminate(true);
??pb.setValue(0);
??pb.setMaximum(100);
??pb.setStringPainted(true);
??pb.setPreferredSize(new Dimension(250,25));
??pb.setMaximumSize(new Dimension(250,250));
??con.add(jb);
??con.add(pb);
??f.setBounds(new Rectangle(300, 300, 300, 300));
??f.show();
?}
?public void actionPerformed(ActionEvent arg0) {
??// TODO 自動(dòng)生成方法存根
??Thread runner = new Thread() {
???public void run() {
????pb.setStringPainted(true);
????for (int i = 0; i < 100; i++) {
?????pb.setValue(i);
?????try {
??????sleep(100);
?????} catch (InterruptedException e) {
??????// TODO 自動(dòng)生成 catch 塊
??????e.printStackTrace();
?????}
????}
????pb.setValue(0);
????pb.setStringPainted(false);
???}
??};
??runner.start();
?}

}
16 數(shù)據(jù)庫操作 日期轉(zhuǎn)換????????
?select * from table where MARKETDATE(date)=to_date('2006/03/19','yyyy/mm/dd')
?告訴 日期格式 自動(dòng)轉(zhuǎn)換

17 applet ---->jsp
? public void toNext() {
??? try{
????? this.getAppletContext().showDocument(new URL(this.getCodeBase()+"pmCtrDecFiv_up.jsp?year="+year+"&unit_id="+unit_id),"_blank");
???? }catch(Exception ex){}
? }

18?tree 線顯示為紅色
? UIManager.put( "Tree.hash", new ColorUIResource(Color.red) );

19 JButton顏色切換
????if(obj==jb)
???{
????jb.setBackground(Color.ORANGE);
????jb1.setBackground(null);
???}
???if(obj==jb1)
???{
????jb1.setBackground(Color.ORANGE);
????jb.setBackground(null);
???}

20 ftp處理
???try {
???FTPClient fc = new FTPClient("10.34.20.78");
???fc.login("ftp", "ftp");
???fc.setType(FTPTransferType.ASCII);
???fc.put("e:/java/ftp/ftp.TXT", "/abc/b.txt");//第一個(gè)參數(shù)為源 第二個(gè)為目的
???fc.quit();
??} catch (Exception e) {}

21StringTokenizer
?????????????????? StringTokenizer st = new StringTokenizer("sss%ddd%eee%ttt%", "%");
????????????????? Vector val = new Vector();
????????????????? int l = 0;
????????????????? System.out.print(st.countTokens() );
????????????????? int num=st.countTokens() ;
????????????????? while (st.hasMoreElements()) {
??????????????????????? val.addElement(st.nextElement());
??????????????????????? l = l + 1;
????????????????? }

22得到服務(wù)器IP

?this.getCodeBase().toString()

23? Runtime.getRuntime().exec("ping 172.20.42.71");
?執(zhí)行命令
?String URL="\"C:\\Program Files\\Internet Explorer\\IEXPLORE.EXE\" http://www.china.com ";
??Process pp=Runtime.getRuntime().exec(URL);

24??? 將字符串轉(zhuǎn)換為Date
?import java.text.SimpleDateFormat;
?String t="2006-05-09";
?SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
?Date d=sdf1.parase(t);

25 setOpaque(false)設(shè)置透明

26 OptionPane設(shè)置背景顏色
Color oldColor1=UIManager.getColor("OptionPane.background");??????? Color oldColor2=UIManager.getColor("Panel.background");??????? String okButtonText=UIManager.getString("OptionPane.okButtonText");??????? String okButtonMnemonic=UIManager.getString("OptionPane.okButtonMnemonic");

?????? UIManager.put("OptionPane.background",Color.cyan);??????? UIManager.put("Panel.background",Color.yellow);??????? UIManager.put("OptionPane.okButtonText","HaHaHa!!!");??????? UIManager.put("OptionPane.okButtonMnemonic",""+((int)'H'));??????? JOptionPane.showMessageDialog(this,"<HTML><B>SUNKING</B><BR><Font Color=green>"????????????????????????????????????? +"SUNKING? </font><BR><I>SUNKING</I></html>");

?????? UIManager.put("OptionPane.background",oldColor1);??????? UIManager.put("Panel.background",oldColor2);??????? UIManager.put("OptionPane.okButtonText",okButtonText);??????? UIManager.put("OptionPane.okButtonMnemonic",okButtonMnemonic);

27使用圖片 ../指上一層
URL url=chat.MainFrame.class.getResource("../images/mm.jpg") ;