// 想实现你的方法，用画图是最快的，即在一个组件上直接画上你的背景图
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// 建议你看看swing 画图这方面的书籍
// 其它我就不写
class My extends JComponent {
// 记住这个方法不要直接调用，如果想让界面更新，请用repaint();交由UI线程来完成
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage image = null;
try {
image = ImageIO.read(new FileInputStream(""));
} catch (Exception e) {
}
// 这里是图片从100,200处开始画
g.drawImage(image, -100, -200, null);
}
}
你是说 JPanel 吗？两种方法：
添加 JLabel，给 JLabel 添加 ImageIcon，然后放置 JLabel 到 JPanel 上就行了：
JPanel pnl = new JPanel();
......
JLabel lblImage = new JLabel(new ImageIcon("你的文件名")); //创建一个带图片的 JLabel
lblImage.setBounds(0, 0, pnl.getWidth(), pnl.getHeight()); //设置 图片的横坐标、纵坐标、宽、高
pnl.add(lblImage); //放置这个 JLabel 到你的 JPanel 上面
还有一种方法是重写 JPanel 的 paint() 方法：
class YourPanel extends JPanel {
private Image img = Toolkit.getDefaultToolkit().createImage("你的文件名"); //用 Toolkit 的 createImage 方法来创建一个 Image 对象
@Override public void paint (Graphics g) {
super.paint(g);
g.drawImage(img, 0, 0, getWidth(), getHeight()); //绘制图片，第一个参数是 Image 对象，第二个参数是 横坐标，第三个是 纵坐标，第四个是 宽，第五个是 高
}
}
以上你隐式重写也可以：
JPanel pnl = new JPanel() {
@Override public void paint (Graphics g) {
...... //但是要注意这样如果你把 Image 声明成了局部变量或者参数形式，你需要声明成 final
}
}
package hao;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
public class ChatPanel extends JPanel {
private static final long serialVersionUID = 1L;
JButton send,record,saveRecord,image;
JTextArea inputArea;
JTextPane text;//注意用法****************************************************************************
JComboBox fontName = null, fontSize = null, fontStyle = null, fontColor = null,fontBackColor = null;
public StyledDocument doc = null; JScrollPane scrollPane;JPanel textChat;
JButton music;
public ChatPanel() {
setLayout(new BorderLayout());
text = new JTextPane();
text.setEditable(false);
doc = text.getStyledDocument();//跟踪文本和图片写到该区域的位置*************************************
scrollPane = new JScrollPane(text);
//注意下面对JComboBox的巧用***********************************************************************
String[] str_name = { "宋体", "黑体", "Dialog", "Gulim" };
String[] str_Size = { "12", "14", "18", "22", "30", "40" };
String[] str_Style = { "常规", "斜体", "粗体", "粗斜体" };
String[] str_Color = { "黑色", "红色", "蓝色", "黄色", "绿色" };
String[] str_BackColor = { "无色", "灰色", "淡红", "淡蓝", "淡黄", "淡绿" };
fontName = new JComboBox(str_name);
fontSize = new JComboBox(str_Size);
fontStyle = new JComboBox(str_Style);
fontColor = new JComboBox(str_Color);
fontBackColor = new JComboBox(str_BackColor);
fontName.setBackground(new Color(255,153,255));
fontSize.setBackground(new Color(255,153,255));
fontStyle.setBackground(new Color(255,153,255));
fontColor.setBackground(new Color(255,153,255));
fontBackColor.setBackground(new Color(255,153,255));
Box box = Box.createVerticalBox();//创建一个可以容纳多个Box组件的Box*******************************
Box box_1 = Box.createHorizontalBox();
Box box_2 = Box.createHorizontalBox();
Box box_4 = Box.createHorizontalBox();
box.add(box_1);
box.add(box_2);
box.add(box_4);
JLabel b1= new JLabel("字体~~"), b2 = new JLabel("样式~~"),b3 = new JLabel("字号~~"),b4 = new JLabel("颜色~~"),b5 = new JLabel("背景~~");
b1.setBackground(new Color(255,153,255));
b2.setBackground(new Color(255,153,255));
b3.setBackground(new Color(255,153,255));
b4.setBackground(new Color(255,153,255));
b5.setBackground(new Color(255,153,255));
box_1.add(b1);
box_1.add(fontName);
box_1.add(Box.createHorizontalStrut(8));
box_1.add(b2);
box_1.add(fontStyle);
box_1.add(Box.createHorizontalStrut(8));
box_1.add(b3);
box_1.add(fontSize);
box_2.add(Box.createHorizontalStrut(8));
box_2.add(b4);
box_2.add(fontColor);
box_2.add(Box.createHorizontalStrut(8));
box_4.add(b5);
box_4.add(fontBackColor);
textChat = new JPanel();
textChat.setLayout(new BorderLayout());
textChat.setBackground(new Color(255,153,255));
inputArea = new JTextArea(3, 20);
inputArea.setLineWrap(true); //设置文本区的换行策略。88888*********************************
send = new JButton("发送");
record=new JButton("显示记录");
saveRecord=new JButton("储存记录");
image=new JButton("表情");
send.setBackground(new Color(255,153,255));
record.setBackground(new Color(255,153,255));
saveRecord.setBackground(new Color(255,153,255));
image.setBackground(new Color(255,153,255));
Box box_3 = Box.createHorizontalBox();
box_3.add(send); box_3.add(Box.createHorizontalStrut(8));//设置按钮间距*************************888
box_3.add(record); box_3.add(Box.createHorizontalStrut(8)); //设置按钮间距*************************888
box_3.add(saveRecord); box_3.add(Box.createHorizontalStrut(8));//设置按钮间距*************************888
box_3.add(image);
box.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));//设置Box的边框线********************
box_3.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));
textChat.add(box,BorderLayout.NORTH);
textChat.add(inputArea,BorderLayout.CENTER);
textChat.add(box_3, BorderLayout.SOUTH);
inputArea.requestFocus(true);
inputArea.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));//设置输入窗口边框线*******************
text.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),8));//设置输入窗口边框线*******************
JPanel audioPanel = new JPanel();//最上面的边框************************************************************************
audioPanel.setBackground(new Color(255,153,255));
audioPanel.setLayout(new GridLayout(1,1));
music = new JButton("想听就听");
music.setPreferredSize(new Dimension(320,50));
music.setBorder(BorderFactory.createLineBorder(Color.BLACK,10));//设置输入窗口边框线*******************
audioPanel.add(music);
add(audioPanel, BorderLayout.NORTH);
add(scrollPane,BorderLayout.CENTER);
add(textChat, BorderLayout.SOUTH);
}
void insertIcon(ImageIcon image) {
text.setCaretPosition(doc.getLength());
text.insertIcon(image);
insert(new MessageStyle());//?????????????????????????????????????????????????????????????????????????????/
}
public void insert(MessageStyle attrib) {
try {
doc.insertString(doc.getLength(), attrib.getText() + "\n", attrib.getAttrSet());//写完后接着换行************
} catch (BadLocationException e) {
e.printStackTrace();
}
}
public MessageStyle getMessageStyle(String line) {
MessageStyle att = new MessageStyle();
att.setText(line);
att.setName((String) fontName.getSelectedItem());
att.setSize(Integer.parseInt((String) fontSize.getSelectedItem()));
String temp_style = (String) fontStyle.getSelectedItem();
if (temp_style.equals("常规")) {
att.setStyle(MessageStyle.GENERAL);
}
else if (temp_style.equals("粗体")) {
att.setStyle(MessageStyle.BOLD);
}
else if (temp_style.equals("斜体")) {
att.setStyle(MessageStyle.ITALIC);
}
else if (temp_style.equals("粗斜体")) {
att.setStyle(MessageStyle.BOLD_ITALIC);
}
String temp_color = (String) fontColor.getSelectedItem();
if (temp_color.equals("黑色")) {
att.setColor(new Color(0, 0, 0));
}
else if (temp_color.equals("红色")) {
att.setColor(new Color(255, 0, 0));
}
else if (temp_color.equals("蓝色")) {
att.setColor(new Color(0, 0, 255));
}
else if (temp_color.equals("黄色")) {
att.setColor(new Color(255, 255, 0));
}
else if (temp_color.equals("绿色")) {
att.setColor(new Color(0, 255, 0));
}
String temp_backColor = (String) fontBackColor.getSelectedItem();
if (!temp_backColor.equals("无色")) {
if (temp_backColor.equals("灰色")) {
att.setBackColor(new Color(200, 200, 200));
}
else if (temp_backColor.equals("淡红")) {
att.setBackColor(new Color(255, 200, 200));
}
else if (temp_backColor.equals("淡蓝")) {
att.setBackColor(new Color(200, 200, 255));
}
else if (temp_backColor.equals("淡黄")) {
att.setBackColor(new Color(255, 255, 200));
}
else if (temp_backColor.equals("淡绿")) {
att.setBackColor(new Color(200, 255, 200));
}
}
return att;
}
}
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class vv extends JDialog {
private static final long serialVersionUID = 1L;
private JLabel l_Id = new JLabel("登陆账户", JLabel.CENTER);
private JLabel l_pw = new JLabel("登陆密码", JLabel.CENTER);
private JTextField t_Id = new JTextField(10);
private JPasswordField t_pw = new JPasswordField(10);
private JButton btnLogin;
private JButton btnClose;
public vv() {
super();
setResizable(false);
getContentPane().setBackground(new Color(225, 225, 225));
getContentPane().setLayout(null);
initialize();
}
protected void initialize() {
setTitle("系统登录");
l_Id.setBounds(48, 43, 53, 25);
t_Id.setBounds(110, 43, 150, 25);
l_pw.setBounds(48, 93, 53, 25);
t_pw.setBounds(110, 93, 150, 25);
getContentPane().add(l_Id);
getContentPane().add(l_pw);
getContentPane().add(t_Id);
getContentPane().add(t_pw);
btnLogin = new JButton();
btnLogin.setText("登 录");
btnLogin.setBounds(70, 142, 85, 28);
btnLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addBtnLoginActionListener();
}
});
getContentPane().add(btnLogin);
btnClose = new JButton();
btnClose.setText("关 闭");
btnClose.setBounds(175, 142, 85, 28);
btnClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
System.exit(-1);
}
});
getContentPane().add(btnClose);
}
private void addBtnLoginActionListener() {
String user = t_Id.getText();
String password = new String(t_pw.getPassword());
if (user.equals("")) {
JOptionPane.showMessageDialog(this, "帐号不可为空", "Caution",
JOptionPane.WARNING_MESSAGE);
return;
}
if (password.equals("")) {
JOptionPane.showMessageDialog(this, "密码不可为空", "Caution",
JOptionPane.WARNING_MESSAGE);
return;
}
String sql = "select * FROM login WHERE id = '" + user + "' and pw = '"
+ password + "'";
boolean success = false;
// TODO:数据校验 success = executeQuery(sql);
if (success) {
// TODO： 如果数据校验成功 显示主界面 并关闭登录界面
JOptionPane.showMessageDialog(this, "成功登录", "提示",
JOptionPane.INFORMATION_MESSAGE);
this.dispose();
} else {
JOptionPane.showMessageDialog(this, "帐号或密码错误!", "警告",
JOptionPane.WARNING_MESSAGE);
t_pw.requestFocus(); // 密码框选中
}
}
public Dimension getPreferredSize() {
return new Dimension(320, 170);
}
public void show() {
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension screen = tk.getScreenSize();
Dimension d = getSize();
this.setLocation((screen.width - d.width) / 2,
(screen.height - d.height) / 2);
// 输入密码后回车相当于点击了登录按钮
getRootPane().setDefaultButton(btnLogin);
t_pw.requestFocus();
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setSize(300, 220);
super.show();
}
public static void main(String[] args) {
vv loginFrame = new vv();
loginFrame.setVisible(true);
}
}
希望对你有帮助
