java显示图像

‘壹’ 用java在Jlabel上显示内存中的jpg图像，

给你说下思路吧，首先你需要把这个byte[]数组组装成图像，这个有API的，然后直接在JLabel上调用设置图像的方法就可以了，具体的函数怎么写，Google吧。。。

‘贰’ 请教Java 如何显示本地图像 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("画笔");
line=new Button("直线");
ellipse=new Button("圆");
rect=new Button("矩形");
clear=new Button("清除");
colorboard=new Button("调色板");
storebutton=new Button("存储文件");
openbutton=new Button("打开文件");

pensize=new Label("画笔大小");
pencolor=new Label("画笔颜色");

storefile=new FileDialog(this,"存储文件",FileDialog.SAVE);
storefile.setVisible(false);
storefile.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
storefile.setVisible(false);
}
});
openfile=new FileDialog(this,"打开文件",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);
}
});

/**
* 添加鼠标事件的监听器，否则，鼠标的移动和点击都将无法识别！
* */
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从Graphics类中继承下来的方法 setColor（）设置当前的颜色
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) { //鼠标点下时候，将当前的点信息记录

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

public void mouseReleased(MouseEvent e) {//鼠标松开时候，如果是画笔，则当前截断，是其余状态记下一枚点信息
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(); //此语要有，否则今生无法删除！
}
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 类的静态方法showDialog（Component component，String title，Color color ），
* 该方法的参数，component是当前显示对话框的父框架，color是设置调色板初始的被选颜色
*
* 该方法返回被选的颜色，类型为Color
* */
Color color=JColorChooser.showDialog(this, "调色板",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) {//鼠标拖动时候，//当且仅当 flagtool＝＝0，或者表示为橡皮的时候
//才将拖动过程中涉及到的点全部记录下来，并且调用repain()方法，重画当前
// 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();
}
}

‘叁’ 怎么在java中显示图像

有出错信息才好诊断。
可能是文件路径错误。

‘肆’ Java图像渐变如何显示图像

image=getImage(getCodeBase(),"a.gif");
这一行描述图片的，显示图片是a.gif
image=getImage(getCodeBase(),"F:\\新建文件夹\\图片\\素材\\f.jpg");
例如，要用绝对路径

‘伍’ java程序产生的实时图像如何在jsp页面显示

java程序产生的图表可以用jfreechart来展示。

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(

"学生成绩柱状图", "学生姓名", "成绩", 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页面只需要执行这个servlet即可完成。

<body>

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

</body>

执行结果如下：

‘陆’ java中怎么样在TextArea或JTextArea中显示一个图像

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

paintContaint(Griphics g){
super（g）;//这行，要加上，否则会导致意料不到的问题
//这里开始，加显示图片的代码
}

‘柒’ java从GUI中读入图像并显示，求解答

fileChooser1.showOpenDialog(null)

得到的路径、得到Image，在JFrame的paint事件中，绘上去

‘捌’ Java支持的图像文件格式

java1.0支持显示gif和jpeg格式的图像文件，这些文件的扩展名为.gif、.jpg或.jpeg。在java.awt.image包、java.awt包和java.applet包中都有对图像的支持

‘玖’ java图像一屏显示

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);