java画图板的文件保存与读取代码（java简单画图板完整代码）

今天给各位分享java画图板的文件保存与读取代码的知识，其中也会对java简单画图板完整代码进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

本文目录一览：

• 1、java写的画图板保存图片是怎么实现的
• 2、java 的文件保存和读取问题？
• 3、GUI画图板（绘图板）设计，用Java编写程序代码！！谢谢！！
• 4、java中画图其数据怎么读出和保存比如画几个圆要代码啊
• 5、java中的文件存取与读取

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！

java 的文件保存和读取问题？

可以通过BufferedReader 流的形式进行流读取，之后通过readLine方法获取到每行的内容，之后通过OutputStreamWriter进行文件写入。

BufferedReader bre = null;

OutputStreamWriter pw = null;//定义一个流

try {

String file = "D:/test/test.txt";

bre = new BufferedReader(new FileReader(file));//此时获取到的bre就是整个文件的缓存流

pw = new OutputStreamWriter(new FileOutputStream(“D:/test.txt”),"GBK");//确认流的输出文件和编码格式，此过程创建了“test.txt”实例

while ((str = bre.readLine())!= null) // 判断最后一行不存在，为空结束循环

{

pw.write(str );//将要写入文件的内容，写入到新文件

}；

pw.close();//关闭流

bre .close();//关闭流

备注：文件流用完之后必须及时通过close方法关闭，否则会一直处于打开状态，直至程序停止，增加系统负担。

GUI画图板（绘图板）设计，用Java编写程序代码！！谢谢！！

只有矩形有圆形能移动，其它实现起来麻烦点，办法有的只是代码太多。

画圆弧改成了画曲线，圆弧稍麻烦，当然方法是很简单的，你可以自己思考一下。

双击13个颜色中的任意一个都会弹出颜色选择器。

有保存与打开功能。扩展名请用 .jdr

基本满足条件，细节可能不是很好，另，代码比较乱，怕不好看懂咯，呼呼。

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.*;

import java.awt.image.BufferedImage;

import java.io.*;

import java.util.ArrayList;

import javax.swing.*;

import javax.swing.filechooser.FileNameExtensionFilter;

public class JDraw {

public static void main(String[] args) {

JFrame f=new JFrame();

f.setDefaultCloseOperation(3);

f.setSize(880,600);

f.setLocationRelativeTo(null);

f.getContentPane().add(M.c);

f.getContentPane().add(M.m,"South");

f.setVisible(true);

}

}

class CVS extends Component implements ComponentListener,MouseListener,MouseMotionListener{

public void componentHidden(ComponentEvent e) {}

public void componentMoved(ComponentEvent e) {}

public void componentResized(ComponentEvent e) {resized();}

public void componentShown(ComponentEvent e) {}

private void resized() {

int w=this.getWidth();

int h=this.getHeight();

tbuff=new BufferedImage(w,h,3);

makeBuff(w,h);

}

private void makeBuff(int w,int h) {

Graphics g = tbuff.getGraphics();

g.drawImage(buff,0,0,null);

g.dispose();

buff=new BufferedImage(w,h,3);

g=buff.getGraphics();

g.drawImage(tbuff,0,0,null);

g.dispose();

}

BufferedImage buff,tbuff;

CVS(){

this.addComponentListener(this);

this.addMouseListener(this);

this.addMouseMotionListener(this);

buff=new BufferedImage(1,1,3);

}

public void paint(Graphics gr){

Graphics2D g = buff.createGraphics();

g.setBackground(new Color(0xff000000,true));

g.clearRect(0,0,getWidth(),getHeight());

g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

M.sa.drawAll(g);

if(M.ts!=null)

M.ts.draw(g);

g.dispose();

gr.drawImage(buff,0,0,this);

gr.dispose();

}

public void mouseClicked(MouseEvent e) {}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {

M.mp(e.getPoint());

}

public void mouseReleased(MouseEvent e) {

M.mr(e.getPoint());

}

public void mouseDragged(MouseEvent e) {

M.md(e.getPoint());

}

public void mouseMoved(MouseEvent e) {}

}

class Menu extends JComponent implements MouseListener,ActionListener{

JComboBox sbox,method;

CLabel[] cl;

JCheckBox fillC,drawB;

JRadioButton fc,bc;

ButtonGroup bg;

JButton clear,up,down,save,load;

Menu(){

this.setLayout(new FlowLayout());

method=new JComboBox(new Object[]{"draw","move","erase",});

add(method);

sbox=new JComboBox(new Object[]{"Pt","Ln","Rect","Cir","Arc",});

add(sbox);

cl=new CLabel[13];

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

cl[i]=new CLabel();

cl[i].addMouseListener(this);

add(cl[i]);

}

fc=new JRadioButton("fc",true);

bc=new JRadioButton("bc");

bg=new ButtonGroup();

bg.add(fc);bg.add(bc);

add(fc);add(bc);

fc.setOpaque(true);

bc.setOpaque(true);

fc.setBackground(Color.white);

bc.setBackground(Color.blue);

fillC=new JCheckBox("Fill",true);

drawB=new JCheckBox("Draw",true);

fillC.addActionListener(this);

drawB.addActionListener(this);

add(fillC);add(drawB);

clear=new JButton("clear");

clear.addActionListener(this);

add(clear);

up=new JButton("zUp");

up.addActionListener(this);

add(up);

down=new JButton("zDown");

down.addActionListener(this);

add(down);

save=new JButton("Save");

save.addActionListener(this);

add(save);

load=new JButton("Load");

load.addActionListener(this);

add(load);

}

public void mouseClicked(MouseEvent e) {

JLabel l=(JLabel)e.getSource();

if(e.getClickCount()==2){

Color sc=JColorChooser.showDialog(null, "Color chooser", l.getBackground());

l.setBackground(sc);

mousePressed(e);

}

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {

Color c=((JLabel)e.getSource()).getBackground();

if(fc.isSelected())

fc.setBackground(c);

else if(bc.isSelected())

bc.setBackground(c);

M.cp();

}

public void mouseReleased(MouseEvent e) {}

public void actionPerformed(ActionEvent e) {

if(e.getSource()==clear)M.clear();

else if(e.getSource()==up)M.up();

else if(e.getSource()==down)M.down();

else if(e.getSource()==save)M.save();

else if(e.getSource()==load)M.load();

else if(e.getSource()==fillC||e.getSource()==drawB)M.cp();

}

}

class CLabel extends JLabel{

static Color[] cs={Color.red,Color.orange,Color.yellow,Color.green,Color.cyan,

Color.blue,Color.magenta,Color.magenta.brighter(),

Color.white,Color.black,Color.gray,Color.LIGHT_GRAY,Color.DARK_GRAY,};

static int i;

CLabel(){

this.setOpaque(true);

this.setBackground(cs[i++]);

this.setBorder(BorderFactory.createLineBorder(Color.black));

this.setPreferredSize(new Dimension(10,20));

}

}

class M{

static JFileChooser jfc=new JFileChooser();

static Menu m=new Menu();

static CVS c=new CVS();

static SA sa=new SA();

static S ts=null,selected=null;

static Color fc,bc;

static void clear(){

sa.ss.clear();

c.repaint();

}

public static void cp() {

System.out.println(selected);

if(selected!=null){

selected.fillColor=m.fc.getBackground();

selected.borderColor=m.bc.getBackground();

selected.fc=m.fillC.isSelected();

selected.db=m.drawB.isSelected();

c.repaint();

}

}

public static void up() {

if(selected!=null){

sa.upZ(selected);

c.repaint();

}

}

public static void down(){

if(selected!=null){

sa.downZ(selected);

c.repaint();

}

}

static{

jfc.setFileFilter(new FileNameExtensionFilter("JDraw file (*.jdraw,*.jdr)","jdr","jdraw"));

}

static void save(){

int x=jfc.showSaveDialog(c);

if(x==JFileChooser.APPROVE_OPTION){

File f = jfc.getSelectedFile();

try{

ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(f));

oos.writeObject(sa);

oos.flush();

oos.close();

}catch(Exception e){}

}

}

static void load(){

int x=jfc.showOpenDialog(c);

if(x==JFileChooser.APPROVE_OPTION){

File f = jfc.getSelectedFile();

try{

ObjectInputStream oos=new ObjectInputStream(new FileInputStream(f));

Object r=oos.readObject();

if(r!=null){

sa=(SA)r;

c.repaint();

}

oos.close();

}catch(Exception e){e.printStackTrace();}

}

}

static int mx,my,tx,ty,ox,oy;

static int pc=0,pmax;

static int sm;

static boolean ne=true;

static int mid;

static void mp(Point p){

mid=m.method.getSelectedIndex();

if(mid==0){

if(ne){

mx=p.x;my=p.y;

pc=0;

sm=m.sbox.getSelectedIndex();

pmax=sm==4?2:1;

ne=false;

}

++pc;

}

else if(mid==1){

checkSel(p);

mx=p.x;my=p.y;

}

else if(mid==2){

checkSel(p);

if(selected!=null){

sa.ss.remove(selected);

c.repaint();

}

}

}

private static void checkSel(Point p) {

selected=null;

for(int i=sa.ss.size();i0; i--)

if(sa.ss.get(i-1).shape.contains(p)){

selected=sa.ss.get(i-1);break;

}

sa.select(selected);

c.repaint();

}

static void mt(){

Shape s=null;

int cx,cy,cw,ch;

switch(sm){

case 0:

case 2:

cx=Math.min(mx,tx);

cy=Math.min(my,ty);

cw=Math.abs(mx-tx);

ch=Math.abs(my-ty);

if(sm==0)

s=new Ellipse2D.Double(cx,cy,cw,ch);

else

s=new Rectangle(cx,cy,cw,ch);

break;

case 1:

s=new Line2D.Float(mx,my,tx,ty);

break;

case 3:

cw=Math.abs(mx-tx);

ch=Math.abs(my-ty);

int cd=(int)Math.sqrt(Math.pow(mx-tx,2)+Math.pow(my-ty,2))*2;

cx=mx-cd/2;

cy=my-cd/2;

s=new Ellipse2D.Double(cx,cy,cd,cd);

break;

case 4:

Path2D p=new Path2D.Double();

p.moveTo(mx,my);

if(pc==1){

p.lineTo(tx, ty);

}

else{

p.quadTo(ox,oy,tx,ty);

}

s=p;

break;

}

ts=new S(s,m.fc.getBackground(),m.bc.getBackground(),m.fillC.isSelected(),m.drawB.isSelected(),null);

c.repaint();

}

static void md(Point p){

if(mid==0){

if(!sa.ss.isEmpty()){

sa.ss.get(sa.ss.size()-1).sel=false;

}

if(pc1){

ox=p.x;oy=p.y;

}

else{

tx=p.x;ty=p.y;

}

mt();

}

else if(mid==1){

if(selected!=null){

moveTo(selected,p);

c.repaint();

}

}

else if(mid==2){

checkSel(p);

if(selected!=null){

sa.ss.remove(selected);

c.repaint();

}

}

}

static void moveTo(S s, Point p) {

if(s.shape instanceof Rectangle){

Rectangle r=(Rectangle)s.shape;

r.setLocation(r.x+p.x-mx,r.y+p.y-my);

mx=p.x;my=p.y;

}

else if(s.shape instanceof Ellipse2D){

Ellipse2D e=(Ellipse2D)s.shape;

e.setFrame(e.getX()+p.x-mx,e.getY()+p.y-my,e.getWidth(),e.getHeight());

mx=p.x;my=p.y;

}

}

static void mr(Point p) {

if(pc==pmax){

pc=0;

ne=true;

sa.add(ts);

selected=ts;

ts=null;

}

}

}

class S implements Serializable{

boolean fc,db,sel=true;

Shape shape;

Color fillColor,borderColor;

Stroke stroke;

static Stroke bstroke=new MyBasicStroke();

static Stroke selectStroke=new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER,1,new float[]{5,2},1);

S(Shape s,Color c,Color b,boolean f,boolean d,Stroke k){

this.shape=s;this.fillColor=c;this.borderColor=b;this.fc=f;this.db=d;this.stroke=k==null?bstroke:k;

}

void draw(Graphics2D g){

if(fc){

g.setColor(fillColor);

g.fill(shape);

}

if(db){

g.setColor(borderColor);

g.setStroke(stroke);

g.draw(shape);

}

if(sel){

g.setColor(Color.green);

g.setStroke(selectStroke);

g.draw(shape.getBounds());

}

}

}

class MyBasicStroke extends BasicStroke implements Serializable{}

class SA implements Serializable{

ArrayListS ss=new ArrayListS();

void add(S s){

if(s!=null){

for(S sx:ss)

sx.sel=false;

ss.add(s);

}

}

S remove(int i){

return ss.remove(i);

}

void remove(S s){

ss.remove(s);

}

void upZ(S s){

indexZ(s,1);

}

void downZ(S s){

indexZ(s,-1);

}

void indexZ(S s, int i) {

int si=ss.indexOf(s);

if(si+i0||si+iss.size()-1)return;

swap(s,ss.get(si+i));

}

void swap(S a,S b){

int ai=ss.indexOf(a);

int bi=ss.indexOf(b);

ss.set(ai,b);

ss.set(bi,a);

}

void select(S s){

for(S x:ss)

x.sel=false;

if(s!=null)

s.sel=true;

}

void drawAll(Graphics2D g){

for(S s:ss)

s.draw(g);

}

}

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);

}

}

}

java中的文件存取与读取

读写是两个不同的分支，通常都是分开单独使用的。

可以通过BufferedReader 流的形式进行流缓存，之后通过readLine方法获取到缓存的内容。

BufferedReader bre = null;

try {

String file = "D:/test/test.txt";

bre = new BufferedReader(new FileReader(file));//此时获取到的bre就是整个文件的缓存流

while ((str = bre.readLine())!= null) // 判断最后一行不存在，为空结束循环

{

System.out.println(str);//原样输出读到的内容

}；

备注： 流用完之后必须close掉，如上面的就应该是：bre.close()，否则bre流会一直存在，直到程序运行结束。

可以通过“FileOutputStream”创建文件实例，之后过“OutputStreamWriter”流的形式进行存储，举例：

OutputStreamWriter pw = null;//定义一个流

pw = new OutputStreamWriter(new FileOutputStream(“D:/test.txt”),"GBK");//确认流的输出文件和编码格式，此过程创建了“test.txt”实例

pw.write("我是要写入到记事本文件的内容");//将要写入文件的内容，可以多次write

pw.close();//关闭流

备注：文件流用完之后必须及时通过close方法关闭，否则会一直处于打开状态，直至程序停止，增加系统负担。

java画图板的文件保存与读取代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java简单画图板完整代码、java画图板的文件保存与读取代码的信息别忘了在本站进行查找喔。