java保存画布图片代码,java怎么导入图片的代码

java 保存图片

ImageIO.write(BufferedImage, "JPG", File);

================================

传入Component保存图像的方法，你试试看还有没有变色。

public void cutScreen(Component com) {

Rectangle rect = com.getBounds();

BufferedImage bi = (BufferedImage) com.createImage(rect.width,

rect.height);

Graphics g = bi.getGraphics();

com.paint(g);

g.dispose();

JFileChooser jfc = new JFileChooser();

jfc.setFileFilter(new FileFilter() {

public boolean accept(File f) {

return f.isDirectory()

|| f.getName().toLowerCase().endsWith(".jpg");

}

public String getDescription() {

return "*.jpg";

}

});

int type = jfc.showSaveDialog(null);

if (type == 0) {

File file = jfc.getSelectedFile();

name = file.getName().toLowerCase();

if (!name.endsWith("jpg")) {

String path = file.getAbsolutePath();

file = new File(path + ".jpg");

for (int i = 0; file.exists(); i++) {

file = new File(path + "(" + i + ").jpg");

}

}

try {

if (!file.exists()) {

file.createNewFile();

}

ImageIO.write(bi, "JPG", file);

} catch (IOException e1) {

e1.printStackTrace();

}

}

}

相关问答

Q1: java swing 画图怎么保存？求详细代码

package test;

import javax.swing.*;

import javax.imageio.ImageIO;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

public class TestJLabel2Image {

public static void main(String ds[]) {

final JFrame f = new JFrame();

JPanel panel = new JPanel(new BorderLayout());

JLabel label = new JLabel() {

public void paintComponent(Graphics g) {

g.setColor(Color.red);

g.fillOval(0, 0, this.getWidth(), this.getHeight());

g.dispose();

}

};

panel.setPreferredSize(new Dimension(555, 555));

panel.add(label, BorderLayout.CENTER);

f.getContentPane().add(panel);

f.pack();

BufferedImage image = createImage(panel);

f.dispose();

try {

ImageIO.write(image, "png", new File("d:/test.png"));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public static BufferedImage createImage(JPanel panel) {

int totalWidth = panel.getPreferredSize().width;

int totalHeight = panel.getPreferredSize().height;

BufferedImage panelImage = new BufferedImage(totalWidth, totalHeight, BufferedImage.TYPE_INT_RGB);

Graphics2D g2D = (Graphics2D) panelImage.createGraphics();

g2D.setColor(Color.WHITE);

g2D.fillRect(0, 0, totalWidth, totalHeight);

g2D.translate(0, 0);

panel.paint(g2D);

g2D.dispose();

return panelImage;

}

}

Q2: java中画图其数据怎么读出和保存比如画几个圆要代码啊

下面是我写的一个小东西，绘制了若干图形：

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.*;

import java.awt.geom.*;

import java.util.ArrayList;

import javax.swing.border.*;

public class DrawingLeftPanel extends JFrame{

private int DX=100;

private int DY=200;

Point point;

DrawingLeftPanel(){

setBackground(Color.GRAY);

setSize(300,700);

setLayout(new GridLayout(1,1));

JPanel panel=new JPanel0();

JScrollPane scrollpane=new JScrollPane(panel);

scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

this.getContentPane().add(scrollpane);

setVisible(true);

}

public static void main(String args[]){

new DrawingLeftPanel();

}

class JPanel0 extends JPanel {

public void paintComponent(Graphics g)

{ int w=getSize().width;

int h=getSize().height;

Shape shape1,shape2,shape3,shape4,shape5,shape6,shape7,shape8,shape9;

int[] xpoints=new int[4];

int[] ypoints=new int[4];

xpoints[0]=DX;

ypoints[0]=DY;

xpoints[1]=DX-50;

ypoints[1]=DY+25;

xpoints[2]=DX;

ypoints[2]=DY+50;

xpoints[3]=DX+50;

ypoints[3]=DY+25;

//画图父类的构造函数

//System.out.println("adfafd");

super.paintComponent(g);

Graphics2D g2=(Graphics2D)g;

//g2.setColor(Color.BLACK);

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

g2.setStroke(new BasicStroke(1.0f));

g2.setColor(Color.LIGHT_GRAY);

Shape e=new Ellipse2D.Double(75,50,50,50);

g2.fill(e);

g2.setColor(Color.BLACK);

g2.draw(e);//画出圆形 概念

e=new Rectangle2D.Double(50,125,100,50);

g2.setColor(Color.LIGHT_GRAY);

g2.fill(e);

g2.setColor(Color.BLACK);

g2.draw(e);//画出矩形 原理规则

e=new Polygon(xpoints,ypoints,4);

g2.setColor(Color.LIGHT_GRAY);

g2.fill(e);

g2.setColor(Color.BLACK);

g2.draw(e);//画出四边形 态度价值观念

shape1=new Ellipse2D.Double(150,275,50,50);

shape2=new Rectangle2D.Double(75,275,100,50);

shape3=new Ellipse2D.Double(50, 275, 50, 50);

Area area1=new Area(shape1);

Area area2=new Area(shape2);

Area area3=new Area(shape3);

area2.subtract(area1);

area3.add(area2);

g2.setColor(Color.LIGHT_GRAY);

g2.fill(area3);

g2.setColor(Color.BLACK);

g2.draw(area3);//画出事实范例

shape4=new Ellipse2D.Double(150,350,50,50);

shape5=new Rectangle2D.Double(75,350,100,50);

shape6=new Ellipse2D.Double(50, 350, 50, 50);

Area area4=new Area(shape4);

Area area5=new Area(shape5);

Area area6=new Area(shape6);

area5.add(area4);

area5.add(area6);

g2.setColor(Color.LIGHT_GRAY);

g2.fill(area5);

g2.setColor(Color.BLACK);

g2.draw(area5);//画出过程

shape7=new Ellipse2D.Double(150,425,50,50);

shape8=new Rectangle2D.Double(75,425,100,50);

shape9=new Ellipse2D.Double(50, 425, 50, 50);

Area area7=new Area(shape7);

Area area8=new Area(shape8);

Area area9=new Area(shape9);

area8.subtract(area7);

area8.add(area9);

g2.setColor(Color.LIGHT_GRAY);

g2.fill(area8);

area8.add(area7);

g2.setColor(Color.BLACK);

g2.draw(area7);

g2.draw(area8);//画出事实范例

shape7=new Line2D.Float(75,525,175,525);

g2.draw(shape7);

GeneralPath p = new GeneralPath(GeneralPath.WIND_EVEN_ODD);

p.moveTo(75, 600);

// adds a cubic curve to the path

p.curveTo(100, 650, 150, 550,200,600);

// p.moveTo(w*.2f, h*.6f);

// adds a quad curve to the path

// p.quadTo(w*.5f, h*1.0f, w*.8f, h*.6f);

g2.setColor(Color.lightGray);

g2.fill(p);

g2.setColor(Color.black);

g2.draw(p);

}

}

}

Q3: 用JAVA怎么 将绘图保存成图片？

用ImageIO类提供的静态方法write(img,foamt,outStream);

先指定文件：

File f=new File("路径");

文件不存在就创建

if(!f.exists()){

f.createNewFile();

}

打开文件流

FileOutputStream fos=new FileOutputStream(f);

然后写入图片数据类型是BufferedImage

ImageIO.write(img,"png",fos);

Q4: java写的画图板保存图片是怎么实现的

首先是得到图片的保存路径，

然后截取图片的路径。。

然后再用文件的输入输出流。。

把文件读入数级组中。。

再它其写到指定的文件夹中。。

这样就实现了文件的保存……

祝你早日成功！