Java課程設計的圖片瀏覽器的原代碼

1、.課程設計的任務及要求任務：圖形化界面(GUI)編程，編寫一個圖片瀏覽器程序1.1可以單張打開圖片1.2可以將同一目錄下的圖片按縮略圖打開1.3按“上一張” “下一張”按鈕可以顯示相應圖片二. 需求分析圖形化界面(GUI)編程，編寫一個圖片瀏覽器程序可以支持“ “.GIF”，“.JPEG'，“.jpeg ”，“.TGA'，“.JPG”，“.jpg ”等格式，單張打開圖片，可 以將同一目錄下的圖片按縮略圖打開按“上一張”“下一張”按鈕可以顯示相應圖片。運行Applet時，圖像不是一氣呵成的，因為方法不是吧圖像完整的裝入 內(nèi)存再顯示的。于此相反，方法創(chuàng)建一個線程，該線程與Apple

2、t的原有線程并發(fā)執(zhí)行，一邊裝入一邊顯示，從而產(chǎn)生上了不聯(lián)需顯示的現(xiàn)象。為了提高圖像才顯示效果，可以采用雙緩沖技術：首先把圖像裝入內(nèi)存，然后再顯示在屏幕上。三. 設計思路3.1界面設計選擇圖片按鈕：主要用dir函數(shù)實現(xiàn)圖片的遍歷。 上一張，下一張：通過做標軸回調(diào)函數(shù)實現(xiàn)。由于本軟件為單機軟件，不需要大量的數(shù)據(jù)讀寫和數(shù)據(jù)交換，實現(xiàn)上、下 功能要求只能讀取PictureBox控件當前加載的目錄，讀取當前路徑，創(chuàng)建一維 數(shù)組。frame = n ewFrame( "Pictureviewer");Panel pb = n ewPa nel();Button select =newB

3、utton("選擇圖片");previous = newButton("上張");next = newButton("下一張”)；select.addActionListener(this );previous .addActionListener(this );3.2.圖像加載：Applet常用來顯示儲存在文件中的圖像，多數(shù)Applet使用的是GIF或JPEG 格式的圖像文件。需Applet加載圖像只需首先定義Image對象，然后使用getlmage()方法把圖像和文件結合起來即可。image_width = bi.getWidth(this

4、);image_height = bi.getHeight(this);double image_proporti on = 1.0 * image_height / image_width;System.out.pri ntl n("image:w "+image_width+",h"+image_height+" ,p1 "+image_proportion);if(image_proporti on > scree n_ proportio n) image_height = scree n_height; image_w

5、idth = (i nt)(image_height / image_proportio n); System.out.pri ntl n(” p1>p0 w= "+image_width); else image_width = scree n_width; image_height = (in t)(image_width * image_proporti on); System.out.pri ntln (” p0>p1 h= "+image_height); 四. 詳細設計4.1.程序設計流程圖42源程序代碼package C;import java.i

6、o.File;import java.io.File nameFilter;public class MyFilter impleme nts File nameFilterprivate Strin g exte nsion;public MyFilter()extension= newString".jpg",".JPG", ".gif",".GIF",".png", ".PNG",".jpeg", ".JPEG"public My

7、Filter(Stri ng exte nsio n)this.exte nsion = exte nsion;public boolea n accept(File dir,Stri ng n ame)for(Stri ng s : exte nsion)if(n ame.e ndsWith(s)return true;return false;package C;import java.awt.*;import java.awt.eve nt.*;import java.awt.image.*;public class MyCa nvas exte nds Can vas impleme

8、nts Comp onen tListe ner /*/private static fin al l ong serialVersi on UID = 1L;private Bufferedlmage bi;private Image im;private int image_width;private int image_height;public void setImage(BufferedImage bi)this.bi = bi;this.zoom();public void pai nt(Graphics g) g.drawlmage(im,(this.getWidth()-ima

9、ge_width)/2,(this.getHeight()-imag e_height)/2,this);_ public void comp onen tResized(Comp onen tEve nt e)if(bi != null)System.out.pri ntln ("resize!");this.zoom();this.repai nt();public void comp onen tMoved(Comp onen tEve nt e)public void comp onen tShow n( Comp onen tEve nt e)public voi

10、d componentHidden(ComponentEvent e)public void zoom()if(bi = n ull)return;int scree n_width = this.getWidth();int scree n_height = this.getHeight();double scree n_proporti on = 1.0 * scree n_height / scree n_width;System.out.pri ntl n("scree n:w"+scree n_width+",h"+scree n_height

11、+" ,p0 "+scree n_proporti on);image_width = bi.getWidth(this);image_height = bi.getHeight(this);double image_proporti on = 1.0 * image_height / image_width;System.out.pri ntl n("image:w "+image_width+",h"+image_height+" ,p1 "+image_proporti on);if(image_propor

12、ti on > scree n_proportio n)image_height = scree n_height;image_width = (i nt)(image_height / image_proportio n);System.out.pri ntl n(” p1>p0 w= "+image_width);elseimage_width = scree n_width;image_height = (in t)(image_width * image_proporti on);System.out.pri ntln (” p0>p1 h= "+

13、image_height); _im=bi.getScaledl nsta nce(image_width,image_height,lmage.SCALE_SMOOTH); 一package C;import java.awt*;import java.awt.event.*;import java.awt.image.*;import java.io.*;import javax.imageio.*;public class T implements ActionListenerprivateFrameframe;privateMyCa nvas mc;privateStri ngfpat

14、h ;privateStri ngfn ame;privateFilefiles ;privateint findex ;private FileDialog fd_load ;private MyFilter filter ;private Butt on previous ;private Butt on n ext ;public static void main( String args) throws Exception n ewT().i ni t();public void in it()frame = n ewFrame( "Pictureviewer");

15、Panel pb =n ewPa nel();Button select =newButton("選擇圖片");previous = newButton("上張");next = newButton("下一張”)；select.addActionListener(this );previous .addActionListener(this );next .addActionListener(this );pb.add(select);pb.add( previous );pb.add(n ext);mc= n ewMyCa nvas();mc

16、setBackground( newColor(200,210,230);mcaddComponentListener( m();frame.add(pb, "North");frame .add( mc "Center");frame .setSize(360,360);frame .setLocati on (400,200);frame .addWindowListener( newWindowAdapter()public void windowClosing(WindowEvent e)System. exit (0);)；frame.setV

17、isible( true );this .validateButton();filter = newMyFilter();fdoad = newFileDialog(frame,"打開文件 ”,FileDialog.LOADfdoad .setFilenameFilter( filter ); _public void action Performed(Acti on Eve nt e)Stri ng comma nd = e.getActio nComma nd();if (command.equals(” 選擇圖片")fdoad .setVisible( true );

18、fpath = fdoad .getDirectory();fname = fd_load .getFile();if (fpath != null ) && ( fname != null )this .display( newFile( fpath + fname);files = newFile( fpath ).listFiles( filter ); this .setIndex(); else if (command.equals(” 上一張")findex -;if (findex <0)fin dex = 0;this .display( fil

19、es findex ); else if (command.equals(” 下一張")fin dex +;if (findex >= files . length )findex = files . length -1;this .display( files findex );this .validateButton();public void display(File f)try BufferedImage bi = ImageIO. read (f);mcsetImage(bi);frame .setTitle( "PictureViewer - "

20、+ f.getName() +""); catch (Exception e)e.pri ntStackTrace();mcrepai nt();public void set In dex()File current =newFile( fpath + fname);if (files != null )for (int i=0;i< files . length ;i+)if (current.equals(files i)fin dex = i;public void validateButton()previous .setEnabled( files !=

21、null ) && ( findex > 0);next .setEnabled( files != null ) && ( findex <(files . length -1); 五. 運行調(diào)試與分析討論5.1.將同一目錄下的圖片按縮略圖打開52單張打開圖片t l.-. -1 Pictu reViewer - 9799_to p.jpg<邂塹自上一張I下一張i53按”上一張”，”下一張”按鈕打開圖片匸|回迭擇圖片1上一張11 三j PictureVieer - sjpg六. 設計體會與小結我通過這次編程實踐學習到了 Image和Griphics相關的類的使用。首先我通過網(wǎng)上搜集資料和自己看 jdk api 對Image、graphics、swin