网上下载的java源代码文件夹如何放在eclipse里编译运行？

打开eclipse——File——Import——General——Existing Projects into Workspace——Next——Browse，将图片上的上一层目录工程文件打开就可以

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java窗口中加载图片？

我刚好写了个浏览图片的。你看有帮助就改改好了

import java.awt.AWTException;

import java.awt.BorderLayout;

import java.awt.FlowLayout;

import java.awt.Image;

import java.awt.MenuItem;

import java.awt.PopupMenu;

import java.awt.Rectangle;

import java.awt.SystemTray;

import java.awt.Toolkit;

import java.awt.TrayIcon;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.io.File;

import java.net.URL;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.swing.BorderFactory;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JPopupMenu;

import javax.swing.JToolBar;

import javax.swing.UIManager;

import javax.swing.filechooser.FileNameExtensionFilter;

public class Picture extends JFrame{

/**

*

*/

private static final long serialVersionUID = 1L;

/**

*

*/

private JPanel state;//状态面板

private JLabel statebar;

private JLabel timebar;

private JPanel client;//中间客户区

private JLabel pic;//图片标签

private TimeThread timethread;

private JToolBar jtoolbar;

private URL[] filepath;

public Picture(String str) throws AWTException

{

super(str);

//windows风格

try { // 使用Windows的界面风格

UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

} catch (Exception e) {

e.printStackTrace();

}

//菜单栏

JMenuBar Menubar=new JMenuBar();

JMenu MenuFile = new JMenu("文件(F)");

MenuFile.setMnemonic('F');

JMenu MenuAbout = new JMenu("关于(H)");

MenuAbout.setMnemonic('H');

Menubar.add(MenuFile);

Menubar.add(MenuAbout);

//菜单项

JMenuItem OpenItem = new JMenuItem("打开图片文件(O)",'O');

OpenItem.setMnemonic('o');

JMenuItem LoadItem = new JMenuItem("批量导入图片(L)",'L');

LoadItem.setMnemonic('L');

JMenuItem ExitItem = new JMenuItem("退出(X)",'X');

ExitItem.setMnemonic('X');

JMenuItem AboutItem = new JMenuItem("关于(A)",'A');

AboutItem.setMnemonic('A');

MenuFile.add(OpenItem);

MenuFile.add(ExitItem);

MenuAbout.add(AboutItem);

//菜单项选项时间注册

OpenItem.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e) {

// TODO 自动生成方法存根

openfile();

}

});

ExitItem.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e){

System.exit(0);

}

});

if (!SystemTray.isSupported())

{

System.out.println("SystemTray is not supported");

return;

}

SystemTray tray = SystemTray.getSystemTray();

Toolkit toolkit = Toolkit.getDefaultToolkit();

Image image = toolkit.getImage("image/tray.gif");

PopupMenu menu = new PopupMenu();

MenuItem ExitItemTray=new MenuItem("退出");

ExitItemTray.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e){

System.exit(0);

}

});

menu.add(ExitItemTray);

TrayIcon icon = new TrayIcon(image,"图片浏览器");

icon.setImageAutoSize(true);

icon.setPopupMenu(menu);

tray.add(icon);

AboutItem.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

// TODO 自动生成方法存根

showhelp();

}

});

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

//设置菜单栏

super.setJMenuBar(Menubar);

timebar=new JLabel();

// 时间线程

timethread =new TimeThread();

timethread.start();

//状态栏信息栏

statebar=new JLabel();

statebar.setText("未选定");

client=new JPanel();

add(client,BorderLayout.CENTER);

client.setBorder(BorderFactory.createTitledBorder(""));

pic =new JLabel();

client.add(pic,BorderLayout.CENTER);

pic.setSize(client.getWidth()-200, client.getHeight());

state = new JPanel();

add(state,BorderLayout.SOUTH);//状态栏

state.setBorder(BorderFactory.createTitledBorder(""));

//状态栏两个面板

state.add(timebar);

timebar.setBorder(BorderFactory.createTitledBorder(""));

state.setLayout(new FlowLayout(FlowLayout.LEFT));

state.add(statebar);

jtoolbar = new JToolBar();

JButton jb_next=new JButton("上一个");

jb_next.addActionListener(new ActionListener (){

public void actionPerformed(ActionEvent e) {

}

});

JButton jb_pre=new JButton("下一个");

JButton jb_play=new JButton("播 放");

jtoolbar.add(jb_next);

jtoolbar.add(jb_pre);

jtoolbar.add(jb_play);

add(jtoolbar,BorderLayout.NORTH);

setSize(700,400);//窗口大小

setLocation(Toolkit.getDefaultToolkit().getScreenSize().width/2-350,150);//设置位置

setVisible(true);//显示

}

//打开图片

public void openfile()

{

JFileChooser f = new JFileChooser(); // 查找文件

FileNameExtensionFilter filter = new FileNameExtensionFilter(

"图片文件(*.jpg,*.gif,*.png)", "jpg", "gif","png");

f.setFileFilter(filter);

f.showOpenDialog(this);

File[] files=new File[100];

files=f.getSelectedFile().listFiles();

ImageIcon img=new ImageIcon(f.getSelectedFile().getPath());

pic.setIcon(img);

statebar.setText("像素大小： "+img.getIconWidth()+"*"+img.getIconHeight()+" 文件位置： "+

f.getSelectedFile().getPath().toString()+" 文件大小： "+f.getSelectedFile().length()/1024+"KB"

);

}

//显示帮助

public void showhelp()

{

JOptionPane.showMessageDialog(this,"这是一款简单的图片浏览器"+"\n"+

"虽然只能进行图片阅览"+"\n"+"以后改进\n"+"作者：lqqnjust");

}

//主函数

public static void main(String[] args) throws Exception {

// TODO 自动生成方法存根

new Picture("图片浏览");

}

//时间线程类

public class TimeThread extends Thread

{

public void run()

{

//不停循环时间刷新

while(true){

Date d=new Date();//获取时间

SimpleDateFormat sdf=new SimpleDateFormat("kk:mm:ss");//转换格式

timebar.setText(sdf.format(d));

try{

Thread.sleep(1000);//1s执行一次

}catch(InterruptedException e)

{

e.printStackTrace();

}

}

}

}

//托盘类

public class CreateTray

{

private CreateTray(){}

private CreateTray ct=null;

/** *//**创建单实列*/

public CreateTray getInstance()

{

//因为使用了判断语句，所以要用getInstance()方法

if(ct==null)

{

ct=new CreateTray();

}

return ct;

}

}

}

java swing添加图片

在java swing中需要为容器添加图片，或者背景图片。

提供两种简单的解决方案，一种利用JPanel，另一种利用JLabel

1.JPanel（源代码）

package oo;

import java.awt.Graphics;

import java.awt.Image;

import java.io.File;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Drawing {

JFrame jframe = new JFrame();

public static JPanel GImage = null;

public Drawing() {

initFrame();

}

// 初始化窗口

public void initFrame() {

// 利用JPanel添加背景图片

GImage = new JPanel() {

protected void paintComponent(Graphics g) {

ImageIcon icon = new ImageIcon("image\\benbenla.jpg");

Image img = icon.getImage();

g.drawImage(img, 0, 0, icon.getIconWidth(),

icon.getIconHeight(), icon.getImageObserver());

jframe.setSize(icon.getIconWidth(), icon.getIconHeight());

}

};

jframe.setTitle("测试背景图片");

jframe.add(GImage);

jframe.pack();

jframe.setVisible(true);

jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

new Drawing();

}

}

2.JLabel源代码

package swing.draw;

import java.awt.Image;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class Drawing2 {

JLabel jlpic = new JLabel();

JFrame jframe = new JFrame();

public Drawing2() {

init1Frame();

}

public void init1Frame() {

ImageIcon icon = new ImageIcon("image\\benbenla.jpg");

icon.setImage(icon.getImage().getScaledInstance(icon.getIconWidth(),

icon.getIconHeight(), Image.SCALE_DEFAULT));

System.out.println(icon.getIconHeight() + "" + icon.getIconWidth());

jlpic.setBounds(0, 0, 1366, 768);

jlpic.setHorizontalAlignment(0);

jlpic.setIcon(icon);

jframe.setSize(1366, 768);

jframe.add(jlpic);

jframe.pack();

jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jframe.setVisible(true);

}

public static void main(String args[]) {

new Drawing2();

}

}

怎么在Java里添加背景图片

可以新建个面板，在面板里放入带图片的JLabel，填满面板即可。

JPanel jp = new JPanel(); //新建面板

jp.setLayout(new FlowLayout()); //设置面板布局

ImageIcon ii=new ImageIcon(getClass().getResource("/Picture/i.jpg"));

JLabel uppicture=new JLabel(ii); //往面板里加入JLabel

this.setVisible(true);

求一个java图片浏览器的源代码，拜托大家了！！！

给你代码，看一下注释，为是防止左右移动时鼠标是水平的移动，所以加了一个范轩，

在二十个象素内，认为是水平的。

你看一下吧

还好你这个是鼠标按住移动，如果只是鼠移动就麻烦了

----------------------------------------

import java.awt.Graphics;

import java.awt.MouseInfo;

import java.awt.Point;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.io.File;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.filechooser.FileNameExtensionFilter;

public class App extends JFrame implements MouseListener, ActionListener {

int x = 0;

int y = 0;

File[] selectedFiles = null;

int fileIndex = 0;

int width = 200;

int height = 200;

public App() {

setDefaultCloseOperation(EXIT_ON_CLOSE);

setLocationRelativeTo(null);

setSize(400, 300);

setResizable(false);

getContentPane().setLayout(null);

JPanel panel = new ImagePanel();

panel.setBounds(12, 40, 370, 218);

getContentPane().add(panel);

addMouseListener(this);

JButton btnBrowse = new JButton("Browse");

btnBrowse.addActionListener(this);

btnBrowse.setBounds(12, 9, 91, 21);

getContentPane().add(btnBrowse);

setVisible(true);

}

public static void main(String[] args) {

new App();

}

public void actionPerformed(ActionEvent e) {

JFileChooser chooser = new JFileChooser();

chooser.setMultiSelectionEnabled(true);

FileNameExtensionFilter filter = new FileNameExtensionFilter(

"JPG GIF Images", "jpg", "gif");

// 设置文件类型

chooser.setFileFilter(filter);

// 打开选择器面板

int returnVal = chooser.showOpenDialog(this);

if (returnVal == JFileChooser.APPROVE_OPTION) {

selectedFiles = chooser.getSelectedFiles();

repaint();

}

}

public void mouseClicked(MouseEvent e) {

}

public void mouseEntered(MouseEvent e) {

}

public void mouseExited(MouseEvent e) {

}

public void mousePressed(MouseEvent e) {

Point point = MouseInfo.getPointerInfo().getLocation();

x = point.x;

y = point.y;

}

public void mouseReleased(MouseEvent e) {

Point point = MouseInfo.getPointerInfo().getLocation();

int thisX = point.x;

int thisY = point.y;

System.out.println("thisX=" + thisX + " " + "thisY=" + thisY);

if ((y - thisY 20 y - thisY 0)

|| (y - thisY 0 y - thisY -20)) {

// Y 在20范围内移动认为是水平移动

if (x thisX) {

// right

if (selectedFiles != null

fileIndex selectedFiles.length - 1) {

fileIndex++;

}

} else {

// left

if (selectedFiles != null fileIndex 0) {

fileIndex--;

}

}

} else {

if (x thisX) {

// 右下

width += 20;

height += 20;

} else {

// 左上

width -= 20;

height -= 20;

}

}

repaint();

}

class ImagePanel extends JPanel {

public void paint(Graphics g) {

super.paint(g);

if (selectedFiles != null) {

ImageIcon icon = new ImageIcon(selectedFiles[fileIndex]

.getPath());

g.drawImage(icon.getImage(), 0, 0, width, height, this);

}

}

}

}

求java版画图程序的源代码

找到了，很久以前写的一个简单画图，呵呵～当时要求用AWT写，很难受。

package net.miqiang.gui;

import java.awt.BasicStroke;

import java.awt.BorderLayout;

import java.awt.Button;

import java.awt.Color;

import java.awt.Cursor;

import java.awt.Dimension;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.GridLayout;

import java.awt.Label;

import java.awt.Panel;

import java.awt.RenderingHints;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.awt.image.BufferedImage;

/**

* 简单画图板程序

* 好久没用 AWT 了，写起来真别扭，如果用 swing 会很舒服，有空再改写吧。

*

* @author 米强

*

*/

public class TestMain extends Frame {

// 画板

private Palette palette = null;

// 显示当前颜色的面板

private Panel nonceColor = null;

// 画笔粗细

private Label drawWidth = null;

// 画笔端点的装饰

private Label drawCap = null;

// 选取颜色按钮的监听事件类

private ButtonColorAction buttonColorAction = null;

// 鼠标进入按钮后光标样式的监听事件类

private ButtonCursor buttonCursor = null;

// 画笔样式的监听事件

private ButtonStrokeAction buttonStrokeAction = null;

/**

* 构造方法

*

*/

public TestMain() {

// 设置标题栏文字

super("简易画图板");

// 构造一个画图板

palette = new Palette();

Panel pane = new Panel(new GridLayout(2, 1));

// 画笔颜色选择器

Panel paneColor = new Panel(new GridLayout(1, 13));

// 12 个颜色选择按钮

Button [] buttonColor = new Button[12];

Color [] color = {Color.black, Color.blue, Color.cyan, Color.darkGray, Color.gray, Color.green, Color.magenta, Color.orange, Color.pink, Color.red, Color.white, Color.yellow};

// 显示当前颜色的面板

nonceColor = new Panel();

nonceColor.setBackground(Color.black);

paneColor.add(nonceColor);

buttonColorAction = new ButtonColorAction();

buttonCursor = new ButtonCursor();

for(int i = 0; i buttonColor.length; i++){

buttonColor[i] = new Button();

buttonColor[i].setBackground(color[i]);

buttonColor[i].addActionListener(buttonColorAction);

buttonColor[i].addMouseListener(buttonCursor);

paneColor.add(buttonColor[i]);

}

pane.add(paneColor);

// 画笔颜色选择器

Panel paneStroke = new Panel(new GridLayout(1, 13));

// 控制画笔样式

buttonStrokeAction = new ButtonStrokeAction();

Button [] buttonStroke = new Button[11];

buttonStroke[0] = new Button("1");

buttonStroke[1] = new Button("3");

buttonStroke[2] = new Button("5");

buttonStroke[3] = new Button("7");

buttonStroke[4] = new Button("9");

buttonStroke[5] = new Button("11");

buttonStroke[6] = new Button("13");

buttonStroke[7] = new Button("15");

buttonStroke[8] = new Button("17");

buttonStroke[9] = new Button("■");

buttonStroke[10] = new Button("●");

drawWidth = new Label("3", Label.CENTER);

drawCap = new Label("●", Label.CENTER);

drawWidth.setBackground(Color.lightGray);

drawCap.setBackground(Color.lightGray);

paneStroke.add(drawWidth);

for(int i = 0; i buttonStroke.length; i++){

paneStroke.add(buttonStroke[i]);

buttonStroke[i].addMouseListener(buttonCursor);

buttonStroke[i].addActionListener(buttonStrokeAction);

if(i = 8){

buttonStroke[i].setName("width");

}else{

buttonStroke[i].setName("cap");

}

if(i == 8){

paneStroke.add(drawCap);

}

}

pane.add(paneStroke);

// 将画笔颜色选择器添加到窗体中

this.add(pane, BorderLayout.NORTH);

// 将画图板添加到窗体中

this.add(palette);

// 添加窗口监听，点击关闭按钮时退出程序

this.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

// 设置窗体 ICON 图标

this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png"));

// 设置窗口的大小

this.setSize(new Dimension(400, 430));

// 设置窗口位置，处于屏幕正中央

this.setLocationRelativeTo(null);

// 显示窗口

this.setVisible(true);

}

/**

* 程序入口

*

* @param args

* 字符串数组参数

*/

public static void main(String[] args) {

new TestMain();

}

/**

* 选取颜色按钮的监听事件类

* @author 米强

*

*/

class ButtonColorAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

Color color_temp = ((Button)e.getSource()).getBackground();

nonceColor.setBackground(color_temp);

palette.setColor(color_temp);

}

}

/**

* 鼠标进入按钮变换光标样式监听事件类

* @author 米强

*

*/

class ButtonCursor extends MouseAdapter {

public void mouseEntered(MouseEvent e) {

((Button)e.getSource()).setCursor(new Cursor(Cursor.HAND_CURSOR));

}

public void mouseExited(MouseEvent e) {

((Button)e.getSource()).setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

}

}

/**

* 设置画笔的监听事件类

* @author 米强

*

*/

class ButtonStrokeAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

Button button_temp = (Button) e.getSource();

String name = button_temp.getName();

if(name.equalsIgnoreCase("width")){

drawWidth.setText(button_temp.getLabel());

palette.setStroke(Float.parseFloat(button_temp.getLabel()));

}else if(name.equalsIgnoreCase("cap")){

drawCap.setText(button_temp.getLabel());

if(button_temp.getLabel().equals("■")){

palette.setStroke(BasicStroke.CAP_SQUARE);

}else if(button_temp.getLabel().equals("●")){

palette.setStroke(BasicStroke.CAP_ROUND);

}

}

}

}

}

/**

* 画板类

*

* @author 米强

*

*/

class Palette extends Panel implements MouseListener, MouseMotionListener {

// 鼠标 X 坐标的位置

private int mouseX = 0;

// 上一次 X 坐标位置

private int oldMouseX = 0;

// 鼠标 Y 坐标的位置

private int mouseY = 0;

// 上一次 Y 坐标位置

private int oldMouseY = 0;

// 画图颜色

private Color color = null;

// 画笔样式

private BasicStroke stroke = null;

// 缓存图形

private BufferedImage image = null;

/**

* 构造一个画板类

*

*/

public Palette() {

this.addMouseListener(this);

this.addMouseMotionListener(this);

// 默认黑色画笔

color = new Color(0, 0, 0);

// 设置默认画笔样式

stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);

// 建立 1280 * 1024 的 RGB 缓存图象

image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB);

// 设置颜色

image.getGraphics().setColor(Color.white);

// 画背景

image.getGraphics().fillRect(0, 0, 1280, 1024);

}

/**

* 重写 paint 绘图方法

*/

public void paint(Graphics g) {

super.paint(g);

// 转换为 Graphics2D

Graphics2D g2d = (Graphics2D) g;

// 获取缓存图形 Graphics2D

Graphics2D bg = image.createGraphics();

// 图形抗锯齿

bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

// 设置绘图颜色

bg.setColor(color);

// 设置画笔样式

bg.setStroke(stroke);

// 画线，从上一个点到新的点

bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY);

// 将缓存中的图形画到画板上

g2d.drawImage(image, 0, 0, this);

}

/**

* 重写 update 方法

*/

public void update(Graphics g) {

this.paint(g);

}

/**

* @return stroke

*/

public BasicStroke getStroke() {

return stroke;

}

/**

* @param stroke 要设置的 stroke

*/

public void setStroke(BasicStroke stroke) {

this.stroke = stroke;

}

/**

* 设置画笔粗细

* @param width

*/

public void setStroke(float width) {

this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin());

}

/**

* 设置画笔端点的装饰

* @param cap 参考 java.awt.BasicStroke 类静态字段

*/

public void setStroke(int cap) {

this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin());

}

/**

* @return color

*/

public Color getColor() {

return color;

}

/**

* @param color 要设置的 color

*/

public void setColor(Color color) {

this.color = color;

}

public void mouseClicked(MouseEvent mouseEvent) {

}

/**

* 鼠标按下

*/

public void mousePressed(MouseEvent mouseEvent) {

this.oldMouseX = this.mouseX = mouseEvent.getX();

this.oldMouseY = this.mouseY = mouseEvent.getY();

repaint();

}

public void mouseReleased(MouseEvent mouseEvent) {

}

/**

* 鼠标进入棋盘

*/

public void mouseEntered(MouseEvent mouseEvent) {

this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));

}

/**

* 鼠标退出棋盘

*/

public void mouseExited(MouseEvent mouseEvent) {

this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

}

/**

* 鼠标拖动

*/

public void mouseDragged(MouseEvent mouseEvent) {

this.oldMouseX = this.mouseX;

this.oldMouseY = this.mouseY;

this.mouseX = mouseEvent.getX();

this.mouseY = mouseEvent.getY();

repaint();

}

public void mouseMoved(MouseEvent mouseEvent) {

}

}

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