import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
@SuppressWarnings("serial")
public class MainformFrame extends JFrame implements ActionListener{
JButton sm,cm,scm,um,exitB;
public MainformFrame(){
setTitle("学生信息管理系统");
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(200,200);
sm=new JButton("学生管理");
cm=new JButton("课程管理");
scm=new JButton("选课管理");
um=new JButton("用户管理");
exitB=new JButton("退出");
exitB.setToolTipText("安全退出系统");
JPanel lowerPanel=new JPanel();
Container c=this.getContentPane();
lowerPanel.add(sm);
lowerPanel.add(cm);
lowerPanel.add(scm);
lowerPanel.add(um);
lowerPanel.add(exitB);
c.add(lowerPanel);
sm.addActionListener(this);
cm.addActionListener(this);
scm.addActionListener(this);
um.addActionListener(this);
exitB.addActionListener(this);
} @Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==sm)
{
sms();
}
if(e.getSource()==cm)
{
cms();
}
if (e.getSource()==scm)
{
scms();
}
if (e.getSource()==um)
{
ums();
}
if (e.getSource()==exitB)
{
shutdown();
}
} private void shutdown() {
} private void ums() {
} private void scms() {
} private void cms() {
} private void sms() {
}
public static void main(String[]args){
new MainformFrame();
}
@SuppressWarnings("unused")
private class MyPanel extends JPanel {
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
super.paintComponent(g);
Image img = Toolkit.getDefaultToolkit().getImage("hello.jpg");
g2.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);
}
} }
请教下面几句,就是想在窗体设置背景颜色,我把图片放在放代码的文件里,可没图片显示,请指教,谢谢
import javax.swing.*;
import java.awt.event.*;
@SuppressWarnings("serial")
public class MainformFrame extends JFrame implements ActionListener{
JButton sm,cm,scm,um,exitB;
public MainformFrame(){
setTitle("学生信息管理系统");
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(200,200);
sm=new JButton("学生管理");
cm=new JButton("课程管理");
scm=new JButton("选课管理");
um=new JButton("用户管理");
exitB=new JButton("退出");
exitB.setToolTipText("安全退出系统");
JPanel lowerPanel=new JPanel();
Container c=this.getContentPane();
lowerPanel.add(sm);
lowerPanel.add(cm);
lowerPanel.add(scm);
lowerPanel.add(um);
lowerPanel.add(exitB);
c.add(lowerPanel);
sm.addActionListener(this);
cm.addActionListener(this);
scm.addActionListener(this);
um.addActionListener(this);
exitB.addActionListener(this);
} @Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==sm)
{
sms();
}
if(e.getSource()==cm)
{
cms();
}
if (e.getSource()==scm)
{
scms();
}
if (e.getSource()==um)
{
ums();
}
if (e.getSource()==exitB)
{
shutdown();
}
} private void shutdown() {
} private void ums() {
} private void scms() {
} private void cms() {
} private void sms() {
}
public static void main(String[]args){
new MainformFrame();
}
@SuppressWarnings("unused")
private class MyPanel extends JPanel {
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
super.paintComponent(g);
Image img = Toolkit.getDefaultToolkit().getImage("hello.jpg");
g2.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);
}
} }
请教下面几句,就是想在窗体设置背景颜色,我把图片放在放代码的文件里,可没图片显示,请指教,谢谢
谁有好的电子教材啊 给发一下
谢谢
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;import java.sql.ResultSet;
public class UserLogin extends JFrame{
JLabel l1=new JLabel("用户名:");
JLabel l2=new JLabel("密码:");
TextField t1=new TextField("test");
JPasswordField t2 = new JPasswordField("test");
JButton queding=new JButton("登 录");
JButton cancel=new JButton("取 消");//创建各个组件
Font zi=new Font("宋体",Font.TYPE1_FONT,10);
String cxname;//用于查询的用户名和密码
String cxpass;
public UserLogin(){
this.setContentPane(new MyPanel());
setTitle("学生信息管理系统");
setLayout(null);
Image ico = Toolkit.getDefaultToolkit().getImage("image\\Mis.gif");
this.setIconImage(ico);
setSize(400, 350);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension scr = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frm = this.getSize();
setLocation( (scr.width - frm.width) / 2,
(scr.height - frm.height) / 2 );//窗体居中
l1.setBounds(90, 100, 120, 20);//l1.setFont(zi);
l1.setForeground(Color.BLUE);
l2.setBounds(90, 160, 120, 20);//l2.setFont(zi);
l2.setForeground(Color.BLUE);
t1.setBounds(150, 100, 150, 27);
t1.setFont(new Font("宋体",Font.CENTER_BASELINE,14));
t2.setBounds(150,160,150,27);
t2.setEchoChar('●');
t2.setFont(zi);
//t2.setFont(zi);
//queding=new JButton(new ImageIcon("ico.gif"));
queding.setBounds(60, 250, 80, 28);
cancel.setBounds(275, 250, 80, 28);
;
add(l1);add(l2);
add(t1);add(t2);
add(queding);
add(cancel);//设置组件,添加组件
this.setVisible(true);//窗体可见
cancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);//对取消的响应
}});
queding.addActionListener(new ActionListener() {//对确定的响应
public void actionPerformed(ActionEvent e) {
checkUser();
}});
t1.addActionListener(new ActionListener() {//对确定的响应
public void actionPerformed(ActionEvent e) {
checkUser();
}});
t2.addActionListener(new ActionListener() {//对确定的响应
public void actionPerformed(ActionEvent e) {
checkUser();
}});
t1.addTextListener(new TextListener() {
public void textValueChanged(TextEvent e) {
t2.setText("");
}});}private void checkUser() {//校验方法
} private class MyPanel extends JPanel {//设置背景
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
super.paintComponent(g);
Image img = Toolkit.getDefaultToolkit().getImage("image\\login.jpg");
g2.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);}
}
public static void main(String[] args){
new UserLogin();
}
}
图片用绝对路径试下,应该路径问题.
是与.jar同一文件夹内,在项目调试时在本项目根文件夹内
public class Main { public static void main(String[] args) {
try {
java.awt.image.BufferedImage rootimage = javax.imageio.ImageIO.read(ClassLoader.getSystemResourceAsStream("\\Image\\1.jpg"));//j.jpg在项目中的路径,Image为包名
System.out.println("exit File:YES");
} catch (IOException ex) {
System.out.println("exit File:No exit");
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
import java.awt.Graphics;
import java.awt.Image;import javax.swing.JPanel;class BackgroundPanel extends JPanel {
/**
* Panel with background
*/
private static final long serialVersionUID = 1L;
Image image; public BackgroundPanel() {
try {
image = javax.imageio.ImageIO
.read(new java.net.URL(
getClass()
.getResource(
"hello.jpg"),
"hello.jpg"));
} catch (Exception e) { /* handled in paintComponent() */
}
} @Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (image != null)
g.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), this);
}
}=======================================================import java.awt.*;
import javax.swing.*;
import java.awt.event.*;@SuppressWarnings("serial")
public class MainformFrame extends JFrame implements ActionListener {
JButton sm, cm, scm, um, exitB; public MainformFrame() {
setTitle("student managment system");
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(200, 200);
sm = new JButton("student managment");
cm = new JButton("course managment");
scm = new JButton("option managment");
um = new JButton("useraccount managment");
exitB = new JButton("out");
exitB.setToolTipText("out safely");
//JPanel lowerPanel=new JPanel();
BackgroundPanel lowerPanel = new BackgroundPanel(); Container c = this.getContentPane();
lowerPanel.add(sm);
lowerPanel.add(cm);
lowerPanel.add(scm);
lowerPanel.add(um);
lowerPanel.add(exitB);
c.add(lowerPanel);
sm.addActionListener(this);
cm.addActionListener(this);
scm.addActionListener(this);
um.addActionListener(this);
exitB.addActionListener(this);
} public void actionPerformed(ActionEvent e) {
if (e.getSource() == sm) {
sms();
}
if (e.getSource() == cm) {
cms();
}
if (e.getSource() == scm) {
scms();
}
if (e.getSource() == um) {
ums();
}
if (e.getSource() == exitB) {
shutdown();
}
} private void shutdown() {
} private void ums() {
} private void scms() {
} private void cms() {
} private void sms() {
} public static void main(String[] args) {
new MainformFrame();
} @SuppressWarnings("unused")
private class MyPanel extends JPanel {
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
super.paintComponent(g);
Image img = Toolkit.getDefaultToolkit().getImage("");
g2.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);
}
}
}
你学java学了几天啊