java顯示圖像

『壹』 用java在Jlabel上顯示內存中的jpg圖像，

給你說下思路吧，首先你需要把這個byte[]數組組裝成圖像，這個有API的，然後直接在JLabel上調用設置圖像的方法就可以了，具體的函數怎麼寫，Google吧。。。

『貳』 請教Java 如何顯示本地圖像 application的

package guitest.myboard;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.io.*;
import java.util.*;
import javax.swing.*;

//the point
//impress the info of one point,the x and y

class OnePoint implements Serializable {
int x;
int y;
int tool;
Color c;
int border;

public OnePoint(int x,int y,int tool,Color cc,int border){
this.x=x;
this.y=y;
this.tool=tool;
this.c=cc;
this.border=border;
}
}

class DrawingBoard extends Frame implements MouseListener,ItemListener,ActionListener,MouseMotionListener{

Button pen;
Button line ;
Button ellipse ;
Button rect ;
Button clear ;
Button colorboard ;
Button storebutton;
Button openbutton;

Choice sizechoice ;
Choice colorchoice ;

Label pensize;
Label pencolor;
Panel panel ;

FileDialog storefile;
FileDialog openfile;

FileInputStream filein;
FileOutputStream fileout;
ObjectInputStream objectin;
ObjectOutputStream objectout;

int flagtool=0;
Color flagcolor;
int border;
BasicStroke size;

OnePoint p1,p2;
Vector<OnePoint> points=new Vector<OnePoint>();

public DrawingBoard(){
pen=new Button("畫筆");
line=new Button("直線");
ellipse=new Button("圓");
rect=new Button("矩形");
clear=new Button("清除");
colorboard=new Button("調色板");
storebutton=new Button("存儲文件");
openbutton=new Button("打開文件");

pensize=new Label("畫筆大小");
pencolor=new Label("畫筆顏色");

storefile=new FileDialog(this,"存儲文件",FileDialog.SAVE);
storefile.setVisible(false);
storefile.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
storefile.setVisible(false);
}
});
openfile=new FileDialog(this,"打開文件",FileDialog.LOAD);
openfile.setVisible(false);
openfile.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
openfile.setVisible(false);
}
});

sizechoice=new Choice();
sizechoice.add("1");
sizechoice.add("2");
sizechoice.add("4");
sizechoice.add("6");
sizechoice.add("8");
sizechoice.addItemListener(this);

colorchoice=new Choice();
colorchoice.add("black");
colorchoice.add("red");
colorchoice.add("blue");
colorchoice.add("green");
colorchoice.addItemListener(this);

pen.addActionListener(this);
line.addActionListener(this);
ellipse.addActionListener(this);
rect.addActionListener(this);
clear.addActionListener(this);
colorboard.addActionListener(this);
storebutton.addActionListener(this);
openbutton.addActionListener(this);

panel=new Panel();

panel.add(storebutton);
panel.add(openbutton);

panel.add(pen);
panel.add(line);
panel.add(ellipse);
panel.add(rect);
panel.add(clear);

panel.add(sizechoice);
panel.add(pensize);

panel.add(colorchoice);
panel.add(pencolor);
panel.add(colorboard);

add(panel,BorderLayout.NORTH);
setBounds(100,100,700,600);
setVisible(true);

addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});

/**
* 添加滑鼠事件的監聽器，否則，滑鼠的移動和點擊都將無法識別！
* */
addMouseListener(this);
addMouseMotionListener(this);
}

public void paint(Graphics g){

Graphics2D g2d=(Graphics2D)g;
if(flagtool==2){ //qing chu
g.clearRect(0,0,getSize().width,getSize().height);
}

for(int i=0;i<points.size()-1;i++){
p1=(OnePoint)points.elementAt(i);
p2=(OnePoint)points.elementAt(i+1);

g2d.setColor(p1.c); //////////////需要使用Graphics2D從Graphics類中繼承下來的方法 setColor（）設置當前的顏色
size=new BasicStroke(p1.border,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);
g2d.setStroke(size);

if(p1.tool==p2.tool){
switch(p1.tool){
case 0:
Line2D.Double line1=new Line2D.Double(p1.x,p1.y,p2.x,p2.y);
g2d.draw(line1);
break;
case 1:
Line2D.Double line2=new Line2D.Double(p1.x,p1.y,p2.x,p2.y);
g2d.draw(line2);
break;
case 3:
Ellipse2D.Double ellipse=new Ellipse2D.Double(p1.x,p1.y,Math.abs(p2.x-p1.x),Math.abs(p2.y-p1.y));
g2d.draw(ellipse);
break;
case 4:
Rectangle2D.Double rect=new Rectangle2D.Double(p1.x,p1.y,Math.abs(p2.x-p1.x),Math.abs(p2.y-p1.y));
g2d.draw(rect);
break;
default:
}
}
}
}

public void mouseClicked(MouseEvent e) {}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) { //滑鼠點下時候，將當前的點信息記錄

OnePoint pp1=new OnePoint(e.getX(),e.getY(),flagtool,flagcolor,border);
points.addElement(pp1);
//repaint();
}

public void mouseReleased(MouseEvent e) {//滑鼠松開時候，如果是畫筆，則當前截斷，是其餘狀態記下一枚點信息
if(flagtool==0){
points.addElement(new OnePoint(-1,-1,22,flagcolor,border));
}
else{
OnePoint pp2=new OnePoint(e.getX(),e.getY(),flagtool,flagcolor,border);
points.addElement(pp2);
points.add(new OnePoint(-1,-1,22,flagcolor,border));
}
repaint();
}

public void itemStateChanged(ItemEvent e) {
if(e.getSource()==colorchoice){
String selected=colorchoice.getSelectedItem();
if(selected=="black"){
flagcolor=new Color(0,0,0);
}
else if(selected=="red"){
flagcolor=new Color(255,0,0);
}
else if(selected=="blue"){
flagcolor=new Color(0,0,255);
}
else if(selected=="green"){
flagcolor=new Color(0,255,0);
}
}
else if(e.getSource()==sizechoice){
String selected=sizechoice.getSelectedItem();
if (selected=="1"){
border=1;
}
else if(selected=="2"){
border=2*2;
}
else if(selected=="4"){
border=4*2;
}
else if(selected=="6"){
border=6*2;
}
else if(selected=="8"){
border=8*2;
}
}

}
public void update(Graphics g) { //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
paint(g);
}
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource()==pen){
flagtool=0;
}
else if(e.getSource()==line){
flagtool=1;
}
else if(e.getSource()==clear){
flagtool=2;
points.removeAllElements();
repaint(); //此語要有，否則今生無法刪除！
}
else if(e.getSource()==ellipse){
flagtool=3;
}
else if(e.getSource()==rect){
flagtool=4;
}
else if(e.getSource()==colorboard){
/*
* 使用 javax.swing.×包中的 JColorChooser 類的靜態方法showDialog（Component component，String title，Color color ），
* 該方法的參數，component是當前顯示對話框的父框架，color是設置調色板初始的被選顏色
*
* 該方法返回被選的顏色，類型為Color
* */
Color color=JColorChooser.showDialog(this, "調色板",flagcolor);
flagcolor=color;
}
else if(e.getSource()==openbutton){
openfile.setVisible(true);
if(openfile.getFile()!=null){
int temp=flagtool;
flagtool=2;
repaint();
try{
points.removeAllElements();
File file=new File(openfile.getDirectory(),openfile.getFile());
filein=new FileInputStream(file);
objectin=new ObjectInputStream(filein);
points=(Vector)objectin.readObject();
objectin.close();
filein.close();
flagtool=temp;
repaint();
}
catch(Exception ee){
System.out.println(ee.toString());
}
}
}
else if(e.getSource()==storebutton){
storefile.setVisible(true);
if(storefile.getFile()!=null){
try {
File file=new File(storefile.getDirectory(),storefile.getFile());
fileout=new FileOutputStream(file);
objectout=new ObjectOutputStream(fileout);
objectout.writeObject(points);
objectout.close();
fileout.close();
repaint();
}
catch (FileNotFoundException e1) {
System.out.println(e1.toString());
e1.printStackTrace();
} catch (IOException ee) {
System.out.println(ee.toString());
ee.printStackTrace();
}
}
}
}

public void mouseDragged(MouseEvent e) {//滑鼠拖動時候，//當且僅當 flagtool＝＝0，或者表示為橡皮的時候
//才將拖動過程中涉及到的點全部記錄下來，並且調用repain()方法，重畫當前
// TODO Auto-generated method stub
if(flagtool==0){
OnePoint pp3=new OnePoint(e.getX(),e.getY(),flagtool,flagcolor,border);
points.addElement(pp3);
repaint();
}
}

public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}

}

public class PaintBoard{
public static void main(String[] args){
DrawingBoard oneBorder=new DrawingBoard();
}
}

『叄』 怎麼在java中顯示圖像

有出錯信息才好診斷。
可能是文件路徑錯誤。

『肆』 Java圖像漸變如何顯示圖像

image=getImage(getCodeBase(),"a.gif");
這一行描述圖片的，顯示圖片是a.gif
image=getImage(getCodeBase(),"F:\\新建文件夾\\圖片\\素材\\f.jpg");
例如，要用絕對路徑

『伍』 java程序產生的實時圖像如何在jsp頁面顯示

java程序產生的圖表可以用jfreechart來展示。

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

response.setContentType("text/html;charset=GBK");

DefaultCategoryDataset dataset = new DefaultCategoryDataset();

LinkDataBase linker=new LinkDataBase();

String sql="select sname,courseName,marks from course,marks,student where student.rollno=marks.rollno and marks.courseid=course.courseid ";

ResultSet rs=linker.executeQuery(sql);

try

{

while(rs.next())

{

dataset.addValue(Integer.parseInt(rs.getString("marks")),rs.getString("courseName"), rs.getString("sname"));

}

}

catch(Exception e)

{

e.printStackTrace();

}

JFreeChart chart = ChartFactory.createBarChart3D(

"學生成績柱狀圖", "學生姓名", "成績", dataset, PlotOrientation.VERTICAL, true, false, false);

try {

ChartUtilities.writeChartAsJPEG(response.getOutputStream(), 1.0f, chart, 400, 300, null);

} catch (Exception e) {

// TODO: handle exception

e.printStackTrace();

} finally {

linker.close();

}

}

jsp頁面只需要執行這個servlet即可完成。

<body>

<img src="JFreeChartServlet" /> <br>

</body>

執行結果如下：

『陸』 java中怎麼樣在TextArea或JTextArea中顯示一個圖像

重寫，JTextField中的paintContaint(Griphics g){},方法;

paintContaint(Griphics g){
super（g）;//這行，要加上，否則會導致意料不到的問題
//這里開始，加顯示圖片的代碼
}

『柒』 java從GUI中讀入圖像並顯示，求解答

fileChooser1.showOpenDialog(null)

得到的路徑、得到Image，在JFrame的paint事件中，繪上去

『捌』 Java支持的圖像文件格式

java1.0支持顯示gif和jpeg格式的圖像文件，這些文件的擴展名為.gif、.jpg或.jpeg。在java.awt.image包、java.awt包和java.applet包中都有對圖像的支持

『玖』 java圖像一屏顯示

final BufferedImage image = ImageIO.read(new File("/image.jpg"));

final JFrame frame = new JFrame();
JPanel imagePanel = new JPanel() {
public void paint(Graphics g) {
g.drawImage(image, 0, 0, frame.getWidth(), frame.getHeight(), null);
}
};

frame.setContentPane(imagePanel);
frame.setSize(500, 500);
frame.setVisible(true);