BMP解码器的练习_JAVA_编程开发_程序员俱乐部

class="MsoNormal" style="line-height: 11pt; margin: 0cm 0cm 10pt;">这是一个BMP解码器的练习，实现8位，24位真彩的解码，放在这里做个记录。希望对各位有用：（分为四个文件，大家可以下载压缩文件，不需要Ctrl+A）

package text;

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import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

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import javax.swing.JFrame;

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public class BMPopener extends JFrame{

????? private Graphics g;

????? public MenuBar creatMenuBar(){

?????????? MenuBar mB = new MenuBar();

?????????? //定义一个菜单

????? ??? Menu mn1 = new Menu("文件");

????? ??? MenuItem mn1_I2 = new MenuItem("打开");

????? ??? ButtonListener bL = new ButtonListener();

????? ??? mn1_I2.addActionListener(bL);

????? ??? mn1.add(mn1_I2);

????? ??? mB.add(mn1);

?????????? return mB;

????? }

????? public void showUI(){

?????????? this.setTitle("BMP打开器");

?????????? this.setSize(1024,768);

?????????? FlowLayout fl = new FlowLayout();

?????????? this.setLayout(fl);

?????????? MenuBar mB = this.creatMenuBar();

?????????? this.setMenuBar(mB);

?????????? this.setResizable(false);

?????????? this.setDefaultCloseOperation(3);

?????????? this.getContentPane().setBackground(Color.WHITE);

?????????? this.setVisible(true);

?????????? g = this.getGraphics();

?????????? g.setFont(new Font("黑体",12,48));

?????????? g.setColor(Color.red);

?????????? g.drawString("欢迎使用", this.getHeight()/2-100,this.getWidth()/2);

????? }

????? public void paint(){

?????????? super.paint(g);

?????????? g.drawString("欢迎使用", this.getHeight()/2-100,this.getWidth()/2);

????? }

??? public static void main(String args[]){

??? BMPopener bOpPopener = new BMPopener();

??? bOpPopener.showUI();

??? }

}

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package text;

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import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.File;

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import javax.swing.JFileChooser;

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public class ButtonListener implements ActionListener{

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????? JFileChooser fileChooser = new JFileChooser();

????? File file;

????? @Override

????? public void actionPerformed(ActionEvent e) {

?????????? // TODO Auto-generated method stub

?????????? fileChooser.showOpenDialog(null);

?????????? file= fileChooser.getSelectedFile();

?????????? String path = file.getAbsolutePath();

?????????? System.out.print(path);

?????????? JiemaBMP jBmp = new JiemaBMP(path);

?????????? jBmp.showJiema();

????? }

}

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package text;

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import java.awt.Color;

import java.awt.Graphics;

import java.io.DataInputStream;

import java.io.EOFException;

import java.io.FileInputStream;

import java.io.IOException;

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import javax.swing.JFrame;

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public class JiemaBMP extends JFrame{

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????? private String pathString;

????? private Graphics g;

????? private UserColor[][] userColors;

????? private int unith = 23;

????? private UserColor[] userTiaoseban;

????? public? JiemaBMP(String path) {

?????????? this.pathString =path;

????? }

????? public void showJiema() {

?????????? // TODO Auto-generated method stub

?????????? try{

???????????????? FileInputStream fis = new FileInputStream(pathString);

???????????????? DataInputStream dis = new DataInputStream(fis);

???????????????? if(dis.read()!= 'B'){

????????????????????? throw new IOException("Not a .BMP file");????

???????????????? }

???????????????? if(dis.read()!='M'){

????????????????????? throw new IOException("Not a .BMP file");

???????????????? }

???????????????? //得到总大小

???????????????? int fileSize = readInt(dis);

???????????????? System.out.println("文件大小："+fileSize);

???????????????? System.out.println(readUsignedShort(dis));

???????????????? System.out.println(readUsignedShort(dis));

???????????????? //读取偏移量

???????????????? int bitmapOffset = readInt(dis);

???????????????? //读取当前结构体的大小

???????????????? System.out.println("bitmapOffset="+bitmapOffset);

???????????????? int bitmapInfoSize = readInt(dis);

???????????????? System.out.println("bitmapInfoSize"+bitmapInfoSize);

???????????????? //读取宽高

???????????????? int width = readInt(dis);

???????????????? int height = readInt(dis);

???????????????? System.out.println("width:"+width+"height:"+height);

???????????????? //读Plants总是1

???????????????? System.out.println(readUsignedShort(dis));

???????????????? //读位数

???????????????? int bitCount = readUsignedShort(dis);

???????????????? System.out.println("bitCount"+bitCount);

???????????????? //读取压缩方式

???????????????? int compressionType = readInt(dis);

???????????????? System.out.println("CompressionType:"+compressionType);

???????????????? //读取图片大小

?????????? ??? int imageSize = readInt(dis);

?????????? ??? //读分辨率

?????????? ??? readInt(dis);

?????????? ??? readInt(dis);

????? ????? ??? //读位图使用的颜色数

?????????? ??? int colorsUsed = readInt(dis);

?????????? ??? int colorsImportant = readInt(dis);

?????????? ??? System.out.println("[colorused]= "+colorsUsed);

?????????? ??? //? Read the pixels from the stream based on the compression type

?????????? ??? if(compressionType ==0){

?????????? ??? ????? if(bitCount == 24||bitCount == 4){

?????????? ??? ?????????? readRGB24(width, height, dis);

?????????? ??? ????? }

?????????? ??? ????? if(bitCount == 8||bitCount == 1){

?????????? ??? ?????????? readRGB8(width, height, dis);

?????????? ??? ????? }

//???????? ??? ????? if(bitCount == 4){

//???????? ??? ?????????? readRGB4(width, height, dis);

//???????? ??? ????? }

//???????? ??? ????? if(bitCount == 1){

//???????? ??? ?????????? readRGB1(width, height, dis);

//???????? ??? ????? }

?????????? ??? }

?????????? ???

?????????? }catch(Exception e){

????????????????

?????????? }

????? }

????? public void readRGB1(int width,int height,DataInputStream dis) throws IOException{

?????

????? }

????? public void readRGB4(int width,int height,DataInputStream dis) throws IOException{

??????????

????? }

????? public void readRGB8(int width,int height,DataInputStream dis)throws IOException{

?????????? this.setTitle(pathString);

?????????? //设置一个大小

?????????? this.setSize(width,height+unith);

?????????? this.setResizable(false);

?????????? this.setVisible(true);

?????????? g = this.getGraphics();

?????????? userTiaoseban = new UserColor[256];

?????????? userColors = new UserColor[width][height];

?????????? for(int i = 0;i<256;i++){

???????????????? int blue = dis.read();

???????????????? int green = dis.read();

???????????????? int red = dis.read();

???????????????? dis.read();

???????????????? userTiaoseban[i] = new UserColor(red, green, blue);

???????????????? System.out.println("加了="+i);

?????????? }

?????????? //System.out.println(userTiaoseban[217].red+userTiaoseban[217].green);

?????????? //按行读取如果H,W为正则到这来

?????????? for(int h = height-1;h>=0;h--){

???????????????? for(int w = 0;w<width;w++){

????? ??? //? Read in the red, green, and blue components

???????????????? int num = dis.read();

???????????????? ?

???????????????? ?? userColors[w][h] = userTiaoseban[num];

???????????????? ?? if((userColors[w][h].red!=255)||(userColors[w][h].green!=255)||(userColors[w][h].blue!= 255)){

????????????????????? ?? g.setColor(new Color(userColors[w][h].red,userColors[w][h].green,userColors[w][h].blue));

????????????????????? ?? g.fillOval(w, h+unith, 1, 1);

????????????????????? ??

???????????????? ?? }

???????????????? }

?????????? }

????? }

????? public void readRGB24(int width,int height,DataInputStream dis)throws IOException{

?????????? this.setTitle(pathString);

?????????? //设置一个大小

?????????? this.setSize(width,height+unith);

?????????? this.setResizable(false);

?????????? this.setVisible(true);

?????????? g = this.getGraphics();

?????????? userColors = new UserColor[width][height];

?????????? //System.out.println(userTiaoseban[217].red+userTiaoseban[217].green);

?????????? //按行读取如果H,W为正则到这来

?????????? for(int h = height-1;h>=0;h--){

???????????????? for(int w = 0;w<width;w++){

????? ??? //? Read in the red, green, and blue components

????????????????????? int blue = dis.read();

????????????????????? int green = dis.read();

????????????????????? int red = dis.read();

????????????????????? userColors[w][h] = new UserColor(red, green, blue);

????? ?????????? ?? if((userColors[w][h].red!=255)||(userColors[w][h].green!=255)||(userColors[w][h].blue!= 255)){

????????????????????? ?? g.setColor(new Color(userColors[w][h].red,userColors[w][h].green,userColors[w][h].blue));

????????????????????? ?? g.fillOval(w, h+unith, 1, 1);

????????????????????? ??

???????????????? ?? }

???????????????? }

????? ????? }

????? }

????? //构造一个整数的方法

????? public final int readInt(DataInputStream dis) throws IOException{

?????????? int ch1 = dis.read();

?????????? int ch2 = dis.read();

?????????? int ch3 = dis.read();

?????????? int ch4 = dis.read();

?????????? if((ch1|ch2|ch3|ch4)<0)

???????????????? throw new IOException();

?????????? return ((ch4<<24)+(ch3<<16)+(ch2<<8)+(ch1<<0));

????? }

??? //构造一个读2个字节整数的方法

????? public final int readUsignedShort(DataInputStream dis) throws IOException{

?????????? int ch1 = dis.read();

?????????? int ch2 = dis.read();

?????????? if((ch1|ch2)<0)

???????????????? throw new EOFException();

?????????? return(ch2<<8)+(ch1<<0);

????? }

????? public final int disHH(int num){

?????????? return (num&8)>>3;

????? }

????? public final int disHL(int num){

?????????? return (num&4)>>2;

????? }

????? public final int disLH(int num){

?????????? return (num&2)>>1;

????? }

????? public final int disLL(int num){

?????????? return (num&1);

????? }

??? /*

???? * 定义一个将高位输出的方法(针对RGB4)

???? */

????? public final int disH(int num){

?????????? return num>>4;

????? }

??? /*

???? * 定义一个将低位输出的方法(针对RGB4)

???? */

????? public final int disL(int num){

?????????? int num1 = 15;

?????????? return num&num1;

????? }

????? //重写重绘方法

????? public void paint(Graphics g){

?????????? super.paint(g);

?????????? for(int h = userColors[0].length-1;h>=0;h--){

???????????????? for(int w=0;w<userColors.length;w++){

????????????????????? if((userColors[w][h].red!=255)||(userColors[w][h].green!=255)||userColors[w][h].blue!=255){

??????????????????????????? g.setColor(new Color(userColors[w][h].red,userColors[w][h].green,userColors[w][h].blue));

??????????????????????????? g.fillOval(w, h+unith, 1, 1);

????????????????????? }

???????????????? }

?????????? }

????? }

}

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package text;

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publicclass UserColor {

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?? publicintred;

?? publicintgreen;

?? publicintblue;

?? public UserColor(int red,int green,int blue){

???? this.red = red;

???? this.green = green;

???? this.blue = blue;

?? }

}

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