자바 개발사진 캡 처 도구 실현 원리

 
/** 
* 
*/ 
package com.b510; 
import java.awt.Rectangle; 
import java.awt.image.BufferedImage; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.util.Date; 
import java.util.Iterator; 
import javax.imageio.ImageIO; 
import javax.imageio.ImageReadParam; 
import javax.imageio.ImageReader; 
import javax.imageio.stream.ImageInputStream; 
/** 
* @date 2012-11-26 
* @author xhw 
* 
*/ 
public class ImageCut { 
/** 
*         :c:\1.jpg 
*/ 
private String srcpath = "e:/poool.jpg"; 
/** 
*           . :c:\2.jpg 
*/ 
private String subpath = "e:/pool_end"; 
/** 
* jpg     
*/ 
private static final String IMAGE_FORM_OF_JPG = "jpg"; 
/** 
* png     
*/ 
private static final String IMAGE_FORM_OF_PNG = "png"; 
/** 
*    x   
*/ 
private int x; 
/** 
*    y   
*/ 
private int y; 
/** 
*       
*/ 
private int width; 
/** 
*       
*/ 
private int height; 
public ImageCut() { 
} 
public ImageCut(int x, int y, int width, int height) { 
this.x = x; 
this.y = y; 
this.width = width; 
this.height = height; 
} 
public static void main(String[] args) throws Exception { 
ImageCut imageCut = new ImageCut(134, 0, 366, 366); 
imageCut.cut(imageCut.getSrcpath(), imageCut.getSubpath()); 
} 
/** 
*             ImageReader   Iterator，   ImageReader           。 
*   ：formatName -           .（   "jpeg"   "tiff"）  。 
* 
* @param postFix 
*        
* @return 
*/ 
public Iterator<ImageReader> getImageReadersByFormatName(String postFix) { 
switch (postFix) { 
case IMAGE_FORM_OF_JPG: 
return ImageIO.getImageReadersByFormatName(IMAGE_FORM_OF_JPG); 
case IMAGE_FORM_OF_PNG: 
return ImageIO.getImageReadersByFormatName(IMAGE_FORM_OF_PNG); 
default: 
return ImageIO.getImageReadersByFormatName(IMAGE_FORM_OF_JPG); 
} 
} 
/** 
*      ，            。 
* @param srcpath       
* @param subpath          
* @throws IOException 
*/ 
public void cut(String srcpath, String subpath) throws IOException { 
FileInputStream is = null; 
ImageInputStream iis = null; 
try { 
//        
is = new FileInputStream(srcpath); 
//          
String postFix = getPostfix(srcpath); 
System.out.println("     ：" + postFix); 
/* 
*             ImageReader   Iterator，   ImageReader           。 
*   ：formatName -           .（   "jpeg"   "tiff"）  。 
*/ 
Iterator<ImageReader> it = getImageReadersByFormatName(postFix); 
ImageReader reader = it.next(); 
//       
iis = ImageIO.createImageInputStream(is); 
/* 
* <p>iis:   .true:      </p>.      ‘     '。 
*                        ，     reader                             。 
*/ 
reader.setInput(iis, true); 
/* 
* <p>            <p>.            Java Image I/O 
*                     。                ImageReader     
* getDefaultReadParam       ImageReadParam    。 
*/ 
ImageReadParam param = reader.getDefaultReadParam(); 
/* 
*       。Rectangle              ，   Rectangle    
*         （x，y）、             。 
*/ 
Rectangle rect = new Rectangle(x, y, width, height); 
//      BufferedImage，             。 
param.setSourceRegion(rect); 
/* 
*        ImageReadParam        imageIndex      ，            
* BufferedImage   。 
*/ 
BufferedImage bi = reader.read(0, param); 
//       
ImageIO.write(bi, postFix, new File(subpath + "_" + new Date().getTime() + "." + postFix)); 
} finally { 
if (is != null) 
is.close(); 
if (iis != null) 
iis.close(); 
} 
} 
/** 
*   inputFilePath    ， ："e:/test.pptx"     ："pptx"<br> 
* 
* @param inputFilePath 
* @return 
*/ 
public String getPostfix(String inputFilePath) { 
return inputFilePath.substring(inputFilePath.lastIndexOf(".") + 1); 
} 
public int getHeight() { 
return height; 
} 
public void setHeight(int height) { 
this.height = height; 
} 
public String getSrcpath() { 
return srcpath; 
} 
public void setSrcpath(String srcpath) { 
this.srcpath = srcpath; 
} 
public String getSubpath() { 
return subpath; 
} 
public void setSubpath(String subpath) { 
this.subpath = subpath; 
} 
public int getWidth() { 
return width; 
} 
public void setWidth(int width) { 
this.width = width; 
} 
public int getX() { 
return x; 
} 
public void setX(int x) { 
this.x = x; 
} 
public int getY() { 
return y; 
} 
public void setY(int y) { 
this.y = y; 
} 
}