Java压缩或放大图像处理详解编程语言

大量的图片如何统一处理成固定宽度、或者固定长宽的图片，java中的java.awt包下面的一些类就可以实现图片处理的功能，下面就是自己写的一个简单的实例

下面的类是单张图片的处理，里面的参数含义可以参照参数命名：

     /**    
[email protected]: 压缩或放大图像处理  
*/    
package cn.lulei.image.deal;     
import java.awt.Color;   
import java.awt.Font;   
import java.awt.Graphics2D;   
import java.awt.Image;   
import java.awt.image.BufferedImage;   
import java.io.File;   
import java.io.FileOutputStream;   
import javax.imageio.ImageIO;   
import com.sun.image.codec.jpeg.JPEGCodec;   
import com.sun.image.codec.jpeg.JPEGImageEncoder;   
public class DealImage {   
private File file = null;   
private String inputDir;   
private String outputDir;   
private String inputFileName;   
private String outputFileName;   
private int outputWidth;   
private int outputHeight;   
private boolean proportion;//是否等比压缩   
public DealImage() {   
this.inputDir = "";   
this.outputDir = "";   
this.inputFileName = "";   
this.outputFileName = "";   
this.outputHeight = 200;   
this.outputWidth = 200;   
this.proportion = true;   
}   
public void setInputDir(String inputDir){   
this.inputDir = inputDir;   
}   
public void setOutputDir(String outputDir){   
this.outputDir = outputDir;   
}   
public void setInputFileName(String inputFileName){   
this.inputFileName = inputFileName;   
}   
public void setOutputFileName(String outputFileName){   
this.outputFileName = outputFileName;   
}   
public void setWidthAngHeight(int outputWidth, int outputHeight){   
this.outputWidth = outputWidth;   
this.outputHeight = outputHeight;   
}   
/**  
* @param isVip  
* @Date: 2013-8-7    
* @Author: lulei    
* @Description:处理图片  
*/   
private void dealImage(boolean isVip) {   
try {   
this.file = new File(this.inputDir + this.inputFileName);   
if (!this.file.exists()){   
return;   
}   
Image img = ImageIO.read(this.file);   
if (img.getWidth(null) == -1) {   
return;   
}   
int[] widthAndHeight = this.getNewWidthAndHeight(img);   
BufferedImage bufferedImage = new BufferedImage(widthAndHeight[0], widthAndHeight[1], BufferedImage.TYPE_INT_RGB);   
Graphics2D g = bufferedImage.createGraphics();   
g.drawImage(img.getScaledInstance(widthAndHeight[0], widthAndHeight[1], Image.SCALE_SMOOTH), 0, 0, null);   
if (!isVip) {   
g.setFont(new Font("楷体", Font.ITALIC, 14));   
g.setColor(Color.getHSBColor(1.0f, 0.3f, 1.0f));   
g.drawString("想要添加的水印", widthAndHeight[0]/3, widthAndHeight[1]/2);   
}   
File fileOut = new File(this.outputDir);   
if (!fileOut.exists()) {   
fileOut.mkdirs();   
}   
FileOutputStream fileOutputStream = new FileOutputStream(this.outputDir + this.outputFileName);   
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fileOutputStream);   
encoder.encode(bufferedImage);   
g.dispose();   
fileOutputStream.close();   
} catch (Exception e) {   
//          e.printStackTrace();   
System.out.println("There're some errors when handling picture which path is :" + this.inputDir + this.inputFileName);   
}   
}   
/**  
* @param inputDir  
* @param inputFileName  
* @param outputDir  
* @param outputFileName  
* @param isVip  
* @Date: 2013-8-7    
* @Author: lulei    
* @Description:处理图片  
*/   
public void dealImage(String inputDir, String inputFileName, String outputDir, String outputFileName, boolean isVip) {   
this.dealImage(inputDir, inputFileName, outputDir, outputFileName, this.outputWidth, this.outputHeight, this.proportion, isVip);   
}   
/**  
* @param inputDir  
* @param inputFileName  
* @param outputDir  
* @param outputFileName  
* @param outputWidth  
* @param outputHeight  
* @param isVip  
* @Date: 2013-8-7    
* @Author: lulei    
* @Description:处理图片  
*/   
public void dealImage(String inputDir, String inputFileName, String outputDir, String outputFileName, int outputWidth, int outputHeight, boolean isVip) {   
this.dealImage(inputDir, inputFileName, outputDir, outputFileName, outputWidth, outputHeight, this.proportion, isVip);   
}   
/**  
* @param inputDir  
* @param inputFileName  
* @param outputDir  
* @param outputFileName  
* @param outputWidth  
* @param outputHeight  
* @param proportion  
* @param isVip  
* @Date: 2013-8-7    
* @Author: lulei    
* @Description:处理图片  
*/   
public void dealImage(String inputDir, String inputFileName, String outputDir, String outputFileName, int outputWidth, int outputHeight, boolean proportion, boolean isVip) {   
this.inputDir = inputDir;   
this.inputFileName = inputFileName;   
this.outputDir = outputDir;   
this.outputFileName = outputFileName;   
this.outputWidth = outputWidth;   
this.outputHeight = outputHeight;   
this.proportion = proportion;   
this.dealImage(isVip);   
}   
/**  
* @param img  
* @return  
* @Date: 2013-8-7    
* @Author: lulei    
* @Description:返回压缩后的图片宽和高  
*/   
private int[] getNewWidthAndHeight(Image img){   
int[] reInt = new int[2];   
if (this.proportion) {   
double rateW = ((double)img.getWidth(null)) / (double)this.outputWidth + 0.1;   
double rateH = ((double)img.getHeight(null)) / (double)this.outputHeight + 0.1;   
double rate = rateW > rateH ? rateW :rateH;   
reInt[0] = (int)(((double)img.getWidth(null)) / rate);   
reInt[1] = (int)(((double)img.getHeight(null)) / rate);   
} else {   
reInt[0] = this.outputWidth;   
reInt[1] = this.outputHeight;   
}   
return reInt;   
}   
}   
下面的类是对图片文件或者图片文件夹做统一的处理： 
Java代码  收藏代码 
/**    
[email protected]:   批处理文件夹下的所有图片    
*/    
package cn.lulei.image.deal;     
import java.io.File;   
import cn.lulei.image.deal.DealImage;   
public class DealImageFile {   
//图片后缀名   
private static String[] IMG_TYPE = {".jpg",".bmp",".jpeg",".png",".pcx",".tiff",".gif",".tga",".exif"   
,".fpx",".svg",".psd","cdr",".pcd",".dxf",".ufo",".eps",".hdri",".ai",".raw"};    
private static int outputHeight = 200;   
private static int outputWidth = 200;   
private static int count = 0;   
private static boolean proportion = true;   
public String dealImageFile(String inputDir, String outputDir) {   
return this.dealImageFile(inputDir, outputDir, outputWidth, outputHeight, proportion);   
}   
public String dealImageFile(String inputDir, String outputDir, int outputWidth, int outputHeight) {   
return this.dealImageFile(inputDir, outputDir, outputWidth, outputHeight, proportion);   
}   
/**  
* @param inputDir  
* @param outputDir  
* @param outputWidth  
* @param outputHeight  
* @param proportion  
* @return  
* @Date: 2013-8-7    
* @Author: lulei    
* @Description:批处理文件夹下的文件  
*/   
public String dealImageFile(String inputDir, String outputDir, int outputWidth, int outputHeight, boolean proportion) {   
File fileDir = new File(inputDir);   
File[] files = fileDir.listFiles();   
DealImage dealImage = new DealImage();   
for (File file : files) {   
String imgPath = file.toString().toLowerCase();   
String fileName = imgPath.substring(inputDir.length());   
if (this.isImage(imgPath)) {   
dealImage.dealImage(inputDir, fileName, outputDir, fileName, outputWidth, outputHeight, proportion, true);   
count++;    
} else if (file.isDirectory()) {   
if (!imgPath.equals(outputDir.toLowerCase())) {   
//这里是递归   
this.dealImageFile(imgPath, outputDir + "/" + fileName, outputWidth, outputHeight, proportion);   
}   
}   
}   
return "Handle " + count + " pictures! ";   
}   
private boolean isImage(String imgPath) {   
for (String str : IMG_TYPE) {   
if (imgPath.endsWith(str)) {   
return true;   
}   
}   
return false;   
}   
public static void main(String[] args) {   
// TODO Auto-generated method stub     
}   
}