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写日记java代码 java写日志
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请教一个简单的java日志怎样写
关于java日志，下面以Log4j为例子说明(供参考)。
1、导包(Log4j所依赖的jar包)
2、配置属性文件。如下：
3、遍写调用日志方法的接口
public interface LoggerUtil {
// 得到Logger，用于打印日志
Logger logger = Logger.getLogger(LoggerUtil.class);
}
4、使用Log4j
//删除数据
@RequestMapping("/delete.do")
public String delete(Students students) {
try {
stuService.delete(students);
} catch (Exception e) {
// 直接使用
LoggerUtil.logger.error(e.getMessage());
}
return "redirect:selectAll.do";
}
相关问答
Q1: 求一个用JAVA写的简单的记事本源代码程序
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.datatransfer.*;
class MyMenuBar extends MenuBar{
public MyMenuBar(Frame parent){
parent.setMenuBar(this);
}
public void addMenus(String [] menus){
for(int i=0;imenus.length;i++)
add(new Menu(menus[i]));
}
public void addMenuItems(int menuNumber,String[] items){
for(int i=0;iitems.length;i++){
if(items[i]!=null)
getMenu(menuNumber).add(new MenuItem(items[i]));
else getMenu(menuNumber).addSeparator();
}
}
public void addActionListener(ActionListener al){
for(int i=0;igetMenuCount();i++)
for(int j=0;jgetMenu(i).getItemCount();j++)
getMenu(i).getItem(j).addActionListener(al);
}
}
class MyFile{
private FileDialog fDlg;
public MyFile(Frame parent){
fDlg=new FileDialog(parent,"",FileDialog.LOAD);
}
private String getPath(){
return fDlg.getDirectory()+"\\"+fDlg.getFile();
}
public String getData() throws IOException{
fDlg.setTitle("打开");
fDlg.setMode(FileDialog.LOAD);
fDlg.setVisible(true);
BufferedReader br=new BufferedReader(new FileReader(getPath()));
StringBuffer sb=new StringBuffer();
String aline;
while((aline=br.readLine())!=null)
sb.append(aline+'\n');
br.close();
return sb.toString();
}
public void setData(String data) throws IOException{
fDlg.setTitle("保存");
fDlg.setMode(FileDialog.SAVE);
fDlg.setVisible(true);
BufferedWriter bw=new BufferedWriter(new FileWriter(getPath()));
bw.write(data);
bw.close();
}
}
class MyClipboard{
private Clipboard cb;
public MyClipboard(){
cb=Toolkit.getDefaultToolkit().getSystemClipboard();
}
public void setData(String data){
cb.setContents(new StringSelection(data),null);
}
public String getData(){
Transferable content=cb.getContents(null);
try{
return (String) content.getTransferData(DataFlavor.stringFlavor);
//DataFlavor.stringFlavor会将剪贴板中的字符串转换成Unicode码形式的String对象。
//DataFlavor类是与存储在剪贴板上的数据的形式有关的类。
}catch(Exception ue){}
return null;
}
}
class MyFindDialog extends Dialog implements ActionListener{
private Label lFind=new Label("查找字符串");
private Label lReplace=new Label("替换字符串");
private TextField tFind=new TextField(10);
private TextField tReplace=new TextField(10);
private Button bFind=new Button("查找");
private Button bReplace=new Button("替换");
private TextArea ta;
public MyFindDialog(Frame owner,TextArea ta){
super(owner,"查找",false);
this.ta=ta;
setLayout(null);
lFind.setBounds(10,30,80,20);
lReplace.setBounds(10,70,80,20);
tFind.setBounds(90,30,90,20);
tReplace.setBounds(90,70,90,20);
bFind.setBounds(190,30,80,20);
bReplace.setBounds(190,70,80,20);
add(lFind);
add(tFind);
add(bFind);
add(lReplace);
add(tReplace);
add(bReplace);
setResizable(false);
bFind.addActionListener(this);
bReplace.addActionListener(this);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
MyFindDialog.this.dispose();
}
});
}//构造函数结束
public void showFind(){
setTitle("查找");
setSize(280,60);
setVisible(true);
}
public void showReplace(){
setTitle("查找替换");
setSize(280,110);
setVisible(true);
}
private void find(){
String text=ta.getText();
String str=tFind.getText();
int end=text.length();
int len=str.length();
int start=ta.getSelectionEnd();
if(start==end) start=0;
for(;start=end-len;start++){
if(text.substring(start,start+len).equals(str)){
ta.setSelectionStart(start);
ta.setSelectionEnd(start+len);
return;
}
}
//若找不到待查字符串，则将光标置于末尾
ta.setSelectionStart(end);
ta.setSelectionEnd(end);
}
public Button getBFind() {
return bFind;
}
private void replace(){
String str=tReplace.getText();
if(ta.getSelectedText().equals(tFind.getText()))
ta.replaceRange(str,ta.getSelectionStart(),ta.getSelectionEnd());
else find();
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==bFind)
find();
else if(e.getSource()==bReplace)
replace();
}
}
public class MyMemo extends Frame implements ActionListener{
private TextArea editor=new TextArea(); //可编辑的TextArea
private MyFile mf=new MyFile(this);//MyFile对象
private MyClipboard cb=new MyClipboard();
private MyFindDialog findDlg=new MyFindDialog(this,editor);
public MyMemo(String title){ //构造函数
super(title);
MyMenuBar mb=new MyMenuBar(this);
//添加需要的菜单及菜单项
mb.addMenus(new String[]{"文件","编辑","查找","帮助"});
mb.addMenuItems(0,new String[]{"新建","打开","保存",null,"全选"});
mb.addMenuItems(1,new String[]{"剪贴","复制","粘贴","清除",null,"全选"});
mb.addMenuItems(2,new String[]{"查找",null,"查找替换"});
mb.addMenuItems(3,new String[]{"我的记事本信息"});
add(editor); //为菜单项注册动作时间监听器
mb.addActionListener(this);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
MyMemo.this.dispose();
}
}); //分号不能忘了
} //构造函数完
public void actionPerformed(ActionEvent e){
String selected=e.getActionCommand(); //获取菜单项标题
if(selected.equals("新建"))
editor.setText("");
else if(selected.equals("打开")){
try{
editor.setText(mf.getData());
}catch(IOException ie){}
}
else if(selected.equals("保存")){
try{
mf.setData(editor.getText());
}catch(IOException ie){}
}
else if(selected.equals("退出")){
dispose();
}
else if(selected.equals("剪贴")){
//将选中的字符串复制到剪贴板中并清除字符串
cb.setData(editor.getSelectedText());
editor.replaceRange("",editor.getSelectionStart(),editor.getSelectionEnd());
}
else if(selected.equals("复制")){
cb.setData(editor.getSelectedText());
}
else if(selected.equals("粘贴")){
String str=cb.getData();
editor.replaceRange(str,editor.getSelectionStart(),editor.getSelectionEnd());
//粘贴在光标位置
}
else if(selected.equals("清除")){
editor.replaceRange("",editor.getSelectionStart(),editor.getSelectionEnd());
}
else if(selected.equals("全选")){
editor.setSelectionStart(0);
editor.setSelectionEnd(editor.getText().length());
}
else if(selected.equals("查找")){
findDlg.showFind();
}
else if(selected.equals("查找替换")){
findDlg.showReplace();
}
}
public static void main(String[] args){
MyMemo memo=new MyMemo("记事本");
memo.setSize(650,450);
memo.setVisible(true);
}
}
Q2: java记事本源代码
给你个做好写日记java代码了的Java的源程序的记事本写日记java代码，自己看看就行了的写日记java代码，不怎么难的···
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class MyNotepad implements ActionListener{
private JFrame frame=new JFrame("新记事本");
private JTextArea jta=new JTextArea();
private String result="";
private boolean flag=true;
private File f;
private JButton jb=new JButton("开始");
private JTextField jtf=new JTextField(15);
private JTextField jt=new JTextField(15);
private JButton jbt=new JButton("替换为");
private JButton jba=new JButton("全部替换");
private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");
private String value;
private int start=0;
private JFrame jf=new JFrame("查找");
private JFrame jfc=new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm=e.getActionCommand();
if("新建".equals(comm)){
if(!(frame.getTitle().equals("新记事本"))){
if(!flag){
write();
newNew();
}else{
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句写日记java代码，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
}
}
}else if(!(jta.getText().isEmpty())){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
newNew();
}
}else{
newNew();
}
}else if("打开".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
jfc.setDialogType(JFileChooser.OPEN_DIALOG);
int returnVal = jfc.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
frame.setTitle(f.getName());
result=read();
flag=false;
value=result;
jta.setText(result);
}
}else if("保存".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
if(flag){
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
}
}else{
write();
}
}else if("另存".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"另存");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
write();
}
}else if("退出".equals(comm)){
System.exit(0);
}else if("撤销".equals(comm)){
jta.setText(value);
}else if("剪切".equals(comm)){
value=jta.getText();
jta.cut();
}else if("复制".equals(comm)){
jta.copy();
}else if("粘贴".equals(comm)){
value=jta.getText();
jta.paste();
}else if("删除".equals(comm)){
value=jta.getText();
jta.replaceSelection(null);
}else if("全选".equals(comm)){
jta.selectAll();
}else if("查找".equals(comm)){
value=jta.getText();
jf.add(jtf,BorderLayout.CENTER);
jf.add(jb,BorderLayout.SOUTH);
jf.setLocation(300,300);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("替换".equals(comm)){
value=jta.getText();
GridLayout gl=new GridLayout(3,3);
JLabel jl1=new JLabel("查找内容:");
JLabel jl2=new JLabel("替换为:");
jfc.setLayout(gl);
jfc.add(jl1);
jfc.add(jtf);
jfc.add(jb);
jfc.add(jl2);
jfc.add(jt);
jfc.add(jbt);
JLabel jl3=new JLabel();
JLabel jl4=new JLabel();
jfc.add(jl3);
jfc.add(jl4);
jfc.add(jba);
jfc.setLocation(300,300);
jfc.pack();
jfc.setVisible(true);
jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("版本".equals(comm)){
JDialog jd=new JDialog(frame,"关于对话框");
jd.setSize(200,200);
JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");
jd.add(l,BorderLayout.CENTER);
jd.setLocation(100,200);
jd.setSize(300,300);
jd.setVisible(true);
// jd.pack();
jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
}else if("开始".equals(comm)||"下一个".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jb.setText("下一个");
// value=value.substring(s+temp.length());//不能截取字串
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("替换为".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jta.replaceSelection(jt.getText());
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("全部替换".equals(comm)){
String temp=jta.getText();
temp=temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
}
}
public String read(){
String temp="";
try {
FileInputStream fis = new FileInputStream(f.getAbsolutePath());
byte[] b=new byte[1024];
while(true){
int num=fis.read(b);
if(num==-1)break;
temp=temp+new String(b,0,num);
}
fis.close();
} catch (Exception e1) {
e1.printStackTrace();
}
return temp;
}
public void write(){
try {
FileOutputStream fos=new FileOutputStream(f);
fos.write(jta.getText().getBytes());
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void newNew(){
frame.dispose();
new MyNotepad();
flag=true;
}
public MyNotepad(){
JMenuBar jmb=new JMenuBar();
String[] menuLab={"文件","编辑","帮助"};
String[][] menuItemLab={{"新建","打开","保存","另存","退出"},
{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},
{"版本"}};
for(int i=0;imenuLab.length;i++){
JMenu menu=new JMenu(menuLab[i]);
jmb.add(menu);
for(int j=0;jmenuItemLab[i].length;j++){
JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);
menu.add(jmi);
jmi.addActionListener(this);
}
}
frame.setJMenuBar(jmb);
jta.setLineWrap(true);//自动换行
JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板
frame.add(jsp);
jb.addActionListener(this);
jbt.addActionListener(this);
jba.addActionListener(this);
frame.setLocation(200,50);
frame.setSize(620,660);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyNotepad();
}
}
Q3: 用java编写一个“我的日记”的界面并使其实现写日记的功能， 最好含有登陆界面的
代码如下，自己测试哦
import java.awt.event.ActionListener;
import javax.swing.*;
import java.awt.*;
import java.awt.Color;
import java.awt.event.ActionEvent;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.io.*;
import java.util.*;
import javax.swing.JColorChooser;
class Diary extends JFrame implements ActionListener,TreeSelectionListener{
JMenuBar menubar;
JMenu menu1,menu2,menu3,menu4,menu5,menu6;
JMenuItem item1,item2,item3,item4,item5,item6,item7,item8,item52,item61,item62,item63,item64;
JTextArea text=new JTextArea(20,40);
JButton b_save=new JButton("保存日志");
JButton b_del=new JButton("删除日志");
JButton b3=new JButton("锁定日志");
JButton b4=new JButton("解除锁定");
JSplitPane split1,split2;
JScrollPane scroll1,scroll2;
JPanel p;
JTree tree=null;
int i=0;
DefaultMutableTreeNode root;
DefaultMutableTreeNode month[]=new DefaultMutableTreeNode[13];
Diary(){
final JFrame frame = this;
menubar=new JMenuBar();
menu4=new JMenu("登陆");
item6=new JMenuItem("密码登陆");
menu4.add(item6);
menubar.add(menu4);
menu1=new JMenu("文件");
item1=new JMenuItem("新建");
item2=new JMenuItem("退出");
menu1.add(item1);
menu1.add(item2);
menubar.add(menu1);
menu2=new JMenu("编辑");
item3=new JMenuItem("复制");
item4=new JMenuItem("剪切");
item5=new JMenuItem("粘贴");
item52=new JMenuItem("全选");
menu2.add(item3);
menu2.add(item4);
menu2.add(item5);
menu2.add(item52);
menubar.add(menu2);
menu3=new JMenu("设置");
//item6=new JMenuItem("密码设置");
item63=new JMenuItem("设置字体颜色");
item64=new JMenuItem("设置背景颜色");
item61=new JMenuItem("锁定编辑区");
item62=new JMenuItem("解除锁定");
//menu3.add(item6);
menu3.add(item63);
menu3.add(item64);
menu3.add(item61);
menu3.add(item62);
menubar.add(menu3);
menu4=new JMenu("查看");
item7=new JMenuItem("状态栏");
menu4.add(item7);
menubar.add(menu4);
menu5=new JMenu("帮助");
item8=new JMenuItem("我的日记本信息");
menu5.add(item8);
menubar.add(menu5);
setJMenuBar(menubar); //把菜单条添加到窗口顶端
Container con=getContentPane(); //调用getContentPane()方法获的内容面板
root=new DefaultMutableTreeNode("日历记事本"); //结合树的输入与输出建立一个日历记事本
for(i=1;i=12;i++)
{
month[i]=new DefaultMutableTreeNode(""+i+"月");
root.add(month[i]);
}
for(i=1;i=12;i++)
{
if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
{
for(int j=1;j=31;j++)
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
else if(i==4||i==6||i==9||i==11)
{
for(int j=1;j=30;j++)
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
else
{
for(int j=1;j=28;j++)
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
}
tree=new JTree(root);
p=new JPanel(); //使用JPanel创建一个面板
p.add(b_save);p.add(b_del);p.add(b3);p.add(b4); //把这4个按钮组件假如面板中
scroll1=new JScrollPane(text,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); //把文本框放入滚动窗格中
b_save.addActionListener((ActionListener) this); //按钮的监听器
b_del.addActionListener((ActionListener) this);
scroll2=new JScrollPane(tree);
split1=new JSplitPane(JSplitPane.VERTICAL_SPLIT,true,p,scroll1); //水平拆分这4个按钮和文本区
split2=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll2,split1); //竖直拆分树行日历和文本按钮区
item1.addActionListener((ActionListener) this); //菜单栏的监听器
item2.addActionListener((ActionListener) this);
item3.addActionListener((ActionListener) this);
item4.addActionListener((ActionListener) this);
item5.addActionListener((ActionListener) this);
item6.addActionListener((ActionListener) this);
item7.addActionListener((ActionListener) this);
item8.addActionListener((ActionListener) this);
item52.addActionListener((ActionListener) this);
item61.addActionListener((ActionListener) this);
item62.addActionListener((ActionListener) this);
item63.addActionListener((ActionListener) this);
tree.addTreeSelectionListener((TreeSelectionListener) this); //树形日历的监听器
con.setLayout(new FlowLayout()); //设置布局
setSize(600,500); //设置窗体的大小
Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();
setLocation((screen.width-300)/2,(screen.height-220)/2);
setResizable(false); //设置窗口不可以调节大小
setVisible(true); //设置窗口为可视
con.add(split2); //把树形日历和按钮，文本区都加入到内容面板中
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //单击关闭图标后关闭窗口
}
public void valueChanged(TreeSelectionEvent e) //处理树形事件的接口
{
text.setText(null);
if(e.getSource()==tree)
{
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(node.isLeaf())
{
String str=node.toString();
for( i=0;i=12;i++)
{
if(node.getParent()==month[i])
{
try{String temp=null;
File f=new File(node.getParent().toString()+str+".text");
FileReader file=new FileReader(f);
BufferedReader in=new BufferedReader(file);
while((temp=in.readLine())!=null)
text.append(temp+'\n');
file.close();
in.close();
}
catch(Exception el){}
}
}
}
}
}
//}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b_save) //保存按钮的实现方法
{
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
String str=node.toString();
if(node.isLeaf())
{
try{
File f=new File(node.getParent().toString()+str+".text");
FileWriter tofile=new FileWriter(f);
BufferedWriter out=new BufferedWriter(tofile);
out.write(text.getText(),0,(text.getText()).length());
out.flush();
tofile.close(); out.close();
}
catch(Exception el){}
}
}
else if(e.getSource()==b_del)
{
int n=JOptionPane.showConfirmDialog(this, "该文件还没有保存，确定要删除吗？","确认对话框", JOptionPane.YES_NO_OPTION);
if(n==JOptionPane.YES_OPTION)
{
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
String str=node.toString();
if(node.isLeaf())
{
File f=new File(node.getParent().toString()+str+".text");
f.delete();
}
}
else if(n==JOptionPane.NO_OPTION)
{
System.exit(0);
}
}
else if(e.getSource()==b3)
{
text.setEditable(false);
}
else if(e.getSource()==b4)
{
text.setEditable(true);
}
String selected=e.getActionCommand(); //获取命令
if(selected.equals("退出")){ //执行"退出"命令
dispose();
}
else if(selected.equals("新建")){
text.setText("");
}
else if(selected.equals("复制"))
{
text.copy();
}
else if(selected.equals("剪切"))
{
text.cut();
}
else if(selected. equals("粘贴"))
{
text.paste();
}
else if(selected.equals("全选"))
{
text.selectAll();
}
else if(selected.equals("密码登陆"))
{
LoginWindow login=new LoginWindow();
}
else if(selected.equals("设置字体颜色")){
Color newColor=JColorChooser.showDialog(this, "选择字体颜色", text.getForeground());
if(newColor !=null)
{
text.setForeground(newColor);
}
}
else if(selected.equals("设置背景颜色"))
{
Color newColor=JColorChooser.showDialog(this, "选择背景颜色", text.getBackground());
if(newColor !=null)
{
text.setBackground(newColor);
}
}
else if(selected.equals("锁定编辑区"))
{
text.setEditable(false);
}
else if(selected.equals("解除锁定"))
{
text.setEditable(true);
}
}
}
class LoginWindow extends JFrame implements ActionListener {
JPanel p1=new JPanel(); //定义并建立面板
JPanel p2=new JPanel();
JPanel p3=new JPanel();
JPanel p4=new JPanel();
JPanel p5=new JPanel();
JTextField text1=new JTextField(15); //用户名文本框
JPasswordField text2=new JPasswordField(15); //密码域
JButton ok=new JButton("确定");
JButton cancel=new JButton("取消");
LoginWindow()
{
setBackground(Color.DARK_GRAY); //设置背景颜色
Container con=getContentPane(); //取出内容面板
con.setLayout(new GridLayout(5,1)); //设置布局为5行1列
p2.add(new JLabel("用户名："));p2.add(text1); //将组件添加到中间容器
p3.add(new JLabel("密码"));p3.add(text2);
p4.add(ok);p4.add(cancel);
ok.addActionListener(this); //注册事件监听器
cancel.addActionListener(this);
text1.addActionListener(this);
text2.addActionListener(this);
con.add(p1); con.add(p2); con.add(p3); con.add(p4); con.add(p5); //将面板添加到内容面板
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //单击关闭图标后关闭窗口
setSize(300,220); //设置窗口的大小
Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();
setLocation((screen.width-300)/2,(screen.height-220)/2);
setTitle("登录窗口");
setResizable(false); // 不让用户改变窗口大小
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==ok||e.getSource()==text2){
if(text1.getText().trim().equals("meijianwen") text2.getText().trim().equals("070341320")){
dispose(); //关闭登陆窗口
}
else{
JOptionPane.showMessageDialog(null, "用户名或密码错误！");
text1.requestFocus(); //设置焦点
text1.setSelectionStart(0); //设置选中文本开始位置
text1.setSelectionEnd(text1.getText().length());
}
}
else if(e.getSource()==cancel){ //单击取消按钮
dispose();
//System.exit(0);
}
else if(e.getSource()==text1) //在用户名文本框按回车焦点移到密码域
text2.requestFocus();
}
}
public class MyDiary
{
public static void main(String args[])
{
JFrame.setDefaultLookAndFeelDecorated(true);
Font font=new Font("JFrame",Font.PLAIN,14); //定义字体
Enumeration keys=UIManager.getLookAndFeelDefaults().keys(); //枚举风格关键字
while(keys.hasMoreElements())
{
Object key=keys.nextElement();
// if(((String)key).equals("Menu.foreground")||((String)key).equals("MenuItem.foreground"))
// UIManager.put(key,Color.DARK_GRAY); //设置菜单文字颜色
if(UIManager.get(key)instanceof Font)UIManager.put(key,font);
}
Diary win=new Diary();
win.validate();
}
}
Q4: 用Java编写简易记事本源代码
importjava.awt.BorderLayout;importjava.awt.Container;importjava.awt.Font;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.awt.event.InputEvent;importjava.awt.event.KeyAdapter;importjava.awt.event.KeyEvent;importjava.awt.event.MouseAdapter;importjava.awt.event.MouseEvent;importjava.awt.event.WindowAdapter;importjava.awt.event.WindowEvent;importjava.io.BufferedReader;importjava.io.BufferedWriter;importjava.io.File;importjava.io.FileReader;importjava.io.FileWriter;importjava.io.IOException;importjavax.swing.BorderFactory;importjavax.swing.JFileChooser;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JMenu;importjavax.swing.JMenuBar;importjavax.swing.JMenuItem;importjavax.swing.JOptionPane;importjavax.swing.JPopupMenu;importjavax.swing.JScrollPane;importjavax.swing.JTextArea;importjavax.swing.KeyStroke;importjavax.swing.ScrollPaneConstants;importjavax.swing.SwingConstants;publicclassJNotePadUIextendsJFrame{privateJMenuItemmenuOpen;privateJMenuItemmenuSave;privateJMenuItemmenuSaveAs;privateJMenuItemmenuClose;privateJMenueditMenu;privateJMenuItemmenuCut;privateJMenuItemmenuCopy;privateJMenuItemmenuPaste;privateJMenuItemmenuAbout;privateJTextAreatextArea;privateJLabelstateBar;privateJFileChooserfileChooser;privateJPopupMenupopUpMenu;publicJNotePadUI(){super("新建文本文件");setUpUIComponent();setUpEventListener();setVisible(true);}privatevoidsetUpUIComponent(){setSize(640,480);//菜单栏JMenuBarmenuBar=newJMenuBar();//设置「文件」菜单JMenufileMenu=newJMenu("文件");menuOpen=newJMenuItem("打开");//快捷键设置menuOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));menuSave=newJMenuItem("保存");menuSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));menuSaveAs=newJMenuItem("另存为");menuClose=newJMenuItem("关闭");menuClose.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,InputEvent.CTRL_MASK));fileMenu.add(menuOpen);fileMenu.addSeparator();//分隔线fileMenu.add(menuSave);fileMenu.add(menuSaveAs);fileMenu.addSeparator();//分隔线fileMenu.add(menuClose);//设置「编辑」菜单JMenueditMenu=newJMenu("编辑");menuCut=newJMenuItem("剪切");menuCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));menuCopy=newJMenuItem("复制");menuCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));menuPaste=newJMenuItem("粘贴");menuPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));editMenu.add(menuCut);editMenu.add(menuCopy);editMenu.add(menuPaste);//设置「关于」菜单JMenuaboutMenu=newJMenu("关于");menuAbout=newJMenuItem("关于JNotePad");aboutMenu.add(menuAbout);menuBar.add(fileMenu);menuBar.add(editMenu);menuBar.add(aboutMenu);setJMenuBar(menuBar);//文字编辑区域textArea=newJTextArea();textArea.setFont(newFont("宋体",Font.PLAIN,16));textArea.setLineWrap(true);JScrollPanepanel=newJScrollPane(textArea,ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);ContainercontentPane=getContentPane();contentPane.add(panel,BorderLayout.CENTER);//状态栏stateBar=newJLabel("未修改");stateBar.setHorizontalAlignment(SwingConstants.LEFT);stateBar.setBorder(BorderFactory.createEtchedBorder());contentPane.add(stateBar,BorderLayout.SOUTH);popUpMenu=editMenu.getPopupMenu();fileChooser=newJFileChooser();}privatevoidsetUpEventListener(){//按下窗口关闭钮事件处理addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){closeFile();}});//菜单-打开menuOpen.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){openFile();}});//菜单-保存menuSave.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){saveFile();}});//菜单-另存为menuSaveAs.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){saveFileAs();}});//菜单-关闭文件menuClose.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){closeFile();}});//菜单-剪切menuCut.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){cut();}});//菜单-复制menuCopy.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){copy();}});//菜单-粘贴menuPaste.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){paste();}});//菜单-关于menuAbout.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){//显示对话框JOptionPane.showOptionDialog(null,"程序名称:\nJNotePad\n"+"程序设计:\n\n"+"简介:\n一个简单的文字编辑器\n"+"可作为验收Java的实现对象\n"+"欢迎网友下载研究交流\n\n"+"/","关于JNotePad",JOptionPane.DEFAULT_OPTION,JOptionPane.INFORMATION_MESSAGE,null,null,null);}});//编辑区键盘事件textArea.addKeyListener(newKeyAdapter(){publicvoidkeyTyped(KeyEvente){processTextArea();}});//编辑区鼠标事件textArea.addMouseListener(newMouseAdapter(){publicvoidmouseReleased(MouseEvente){if(e.getButton()==MouseEvent.BUTTON3)popUpMenu.show(editMenu,e.getX(),e.getY());}publicvoidmouseClicked(MouseEvente){if(e.getButton()==MouseEvent.BUTTON1)popUpMenu.setVisible(false);}});}privatevoidopenFile(){if(isCurrentFileSaved()){//文件是否为保存状态open();//打开}else{//显示对话框intoption=JOptionPane.showConfirmDialog(null,"文件已修改，是否保存？","保存文件？",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE,null);switch(option){//确认文件保存caseJOptionPane.YES_OPTION:saveFile();//保存文件break;//放弃文件保存caseJOptionPane.NO_OPTION:open();break;}}}privatebooleanisCurrentFileSaved(){if(stateBar.getText().equals("未修改")){returnfalse;}else{returntrue;}}privatevoidopen(){//fileChooser是JFileChooser的实例//显示文件选取的对话框intoption=fileChooser.showDialog(null,null);//使用者按下确认键if(option==JFileChooser.APPROVE_OPTION){try{//开启选取的文件BufferedReaderbuf=newBufferedReader(newFileReader(fileChooser.getSelectedFile()));//设定文件标题setTitle(fileChooser.getSelectedFile().toString());//清除前一次文件textArea.setText("");//设定状态栏stateBar.setText("未修改");//取得系统相依的换行字符StringlineSeparator=System.getProperty("line.separator");//读取文件并附加至文字编辑区Stringtext;while((text=buf.readLine())!=null){textArea.append(text);textArea.append(lineSeparator);}buf.close();}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"开启文件失败",JOptionPane.ERROR_MESSAGE);}}}privatevoidsaveFile(){//从标题栏取得文件名称Filefile=newFile(getTitle());//若指定的文件不存在if(!file.exists()){//执行另存为saveFileAs();}else{try{//开启指定的文件BufferedWriterbuf=newBufferedWriter(newFileWriter(file));//将文字编辑区的文字写入文件buf.write(textArea.getText());buf.close();//设定状态栏为未修改stateBar.setText("未修改");}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"写入文件失败",JOptionPane.ERROR_MESSAGE);}}}privatevoidsaveFileAs(){//显示文件对话框intoption=fileChooser.showSaveDialog(null);//如果确认选取文件if(option==JFileChooser.APPROVE_OPTION){//取得选择的文件Filefile=fileChooser.getSelectedFile();//在标题栏上设定文件名称setTitle(file.toString());try{//建立文件file.createNewFile();//进行文件保存saveFile();}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"无法建立新文件",JOptionPane.ERROR_MESSAGE);}}}privatevoidcloseFile(){//是否已保存文件if(isCurrentFileSaved()){//释放窗口资源，而后关闭程序dispose();}else{intoption=JOptionPane.showConfirmDialog(null,"文件已修改，是否保存？","保存文件？",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE,null);switch(option){caseJOptionPane.YES_OPTION:saveFile();break;caseJOptionPane.NO_OPTION:dispose();}}}privatevoidcut(){textArea.cut();stateBar.setText("已修改");popUpMenu.setVisible(false);}privatevoidcopy(){textArea.copy();popUpMenu.setVisible(false);}privatevoidpaste(){textArea.paste();stateBar.setText("已修改");popUpMenu.setVisible(false);}privatevoidprocessTextArea(){stateBar.setText("已修改");}publicstaticvoidmain(String[]args){newJNotePadUI();}}
Q5: java怎么写日志记录，最好是完整的代码！谢啦！
常用2种方式，具体你可以去自己写，建议，编程前期主要靠你自己琢磨，他人给你思路即可。
1.用简单的读写文件实现，写一个写文件的共用类，每次把日志写到文件里即可。
2.用开源免费的日志工具，如log4j。
祝你成功！！
写日记java代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java写日志、写日记java代码的信息别忘了在本站进行查找喔。
