一首先寫出路圖像壓縮的類
package com.lbnet.lzx.util;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
28. * 圖像壓縮工具
29. * @author
30. *
31. */
public class ImageSizer {
public static final MediaTracker tracker = new MediaTracker(new Component() {
private static final long serialVersionUID = 1234162663955668507L;}
);
/**
* @param originalFile 原圖像
* @param resizedFile 壓縮後的圖像
* @param width 圖像寬
* @param format 圖片格式 jpg, png, gif(非動畫)
* @throws IOException
*/
public static void resize(File originalFile, File resizedFile, int width, String format) throws IOException {
if(format!=null && "gif".equals(format.toLowerCase())){
resize(originalFile, resizedFile, width, 1);
return;
}
FileInputStream fis = new FileInputStream(originalFile);
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
int readLength = -1;
int bufferSize = 1024;
byte bytes[] = new byte[bufferSize];
while ((readLength = fis.read(bytes, 0, bufferSize)) != -1) {
byteStream.write(bytes, 0, readLength);
}
byte[] in = byteStream.toByteArray();
fis.close();
byteStream.close();
Image inputImage = Toolkit.getDefaultToolkit().createImage( in );
waitForImage( inputImage );
int imageWidth = inputImage.getWidth( null );
if ( imageWidth < 1 )
throw new IllegalArgumentException( "image width " + imageWidth + " is out of range" );
int imageHeight = inputImage.getHeight( null );
if ( imageHeight < 1 )
throw new IllegalArgumentException( "image height " + imageHeight + " is out of range" );
// Create output image.
int height = -1;
double scaleW = (double) imageWidth / (double) width;
double scaleY = (double) imageHeight / (double) height;
if (scaleW >= 0 && scaleY >=0) {
if (scaleW > scaleY) {
height = -1;
} else {
width = -1;
}
}
Image outputImage = inputImage.getScaledInstance( width, height, java.awt.Image.SCALE_DEFAULT);
checkImage( outputImage );
encode(new FileOutputStream(resizedFile), outputImage, format);
}
/** Checks the given image for valid width and height. */
private static void checkImage( Image image ) {
waitForImage( image );
int imageWidth = image.getWidth( null );
if ( imageWidth < 1 )
throw new IllegalArgumentException( "image width " + imageWidth + " is out of range" );
int imageHeight = image.getHeight( null );
if ( imageHeight < 1 )
throw new IllegalArgumentException( "image height " + imageHeight + " is out of range" );
}
/** Waits for given image to load. Use before querying image height/width/colors. */
private static void waitForImage( Image image ) {
try {
tracker.addImage( image, 0 );
tracker.waitForID( 0 );
tracker.removeImage(image, 0);
} catch( InterruptedException e ) { e.printStackTrace(); }
}
/** Encodes the given image at the given quality to the output stream. */
private static void encode( OutputStream outputStream, Image outputImage, String format )
throws java.io.IOException {
int outputWidth = outputImage.getWidth( null );
if ( outputWidth < 1 )
throw new IllegalArgumentException( "output image width " + outputWidth + " is out of range" );
int outputHeight = outputImage.getHeight( null );
if ( outputHeight < 1 )
throw new IllegalArgumentException( "output image height " + outputHeight + " is out of range" );
// Get a buffered image from the image.
BufferedImage bi = new BufferedImage( outputWidth, outputHeight,
BufferedImage.TYPE_INT_RGB );
Graphics2D biCoNtext = bi.createGraphics();
biCoNtext.drawImage( outputImage, 0, 0, null );
ImageIO.write(bi, format, outputStream);
System.out.println("----the end ------");
outputStream.flush();
outputStream.close();
}
/**
* 縮放gif圖片
* @param originalFile 原圖片
* @param resizedFile 縮放後的圖片
* @param newWidth 寬度
* @param quality 縮放比例 (等比例)
* @throws IOException
*/
private static void resize(File originalFile, File resizedFile, int newWidth, float quality) throws IOException {
if (quality < 0 || quality > 1) {
throw new IllegalArgumentException("Quality has to be between 0 and 1");
}
ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
Image i = ii.getImage();
Image resizedImage = null;
int iWidth = i.getWidth(null);
int iHeight = i.getHeight(null);
if (iWidth > iHeight) {
resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight) / iWidth, Image.SCALE_SMOOTH);
} else {
resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight, newWidth, Image.SCALE_SMOOTH);
}
// This code ensures that all the pixels in the image are loaded.
Image temp = new ImageIcon(resizedImage).getImage();
// Create the buffered image.
BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null), temp.getHeight(null),
BufferedImage.TYPE_INT_RGB);
// Copy image to buffered image.
Graphics g = bufferedImage.createGraphics();
// Clear background and paint the image.
g.setColor(Color.white);
g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
g.drawImage(temp, 0, 0, null);
g.dispose();
// Soften.
float softenFactor = 0.05f;
float[] softenArray = {0, softenFactor, 0, softenFactor, 1-(softenFactor*4), softenFactor, 0, softenFactor, 0};
Kernel kernel = new Kernel(3, 3, softenArray);
ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
bufferedImage = cOp.filter(bufferedImage, null);
// Write the jpeg to a file.
FileOutputStream out = new FileOutputStream(resizedFile);
// Encodes image as a JPEG data stream
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bufferedImage);
param.setQuality(quality, true);
encoder.setJPEGEncodeParam(param);
encoder.encode(bufferedImage);
}
}
二處理圖像上傳並進行壓縮的類
package com.lbnet.lzx.util;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.struts.upload.FormFile;
public class uploadImage{
public String upload(String dir, FormFile formFile) throws Exception {
Date date = new Date();
//取欲上傳的檔的名字和長度
String fname = formFile.getFileName();
//將上傳時間加入檔案名
int i = fname.indexOf(".");
String name = String.valueOf(date.getTime());
String type = fname.substring(i + 1);
fname = name + "." + type;
InputStream streamIn = formFile.getInputStream(); //創建讀取使用者上傳檔的物件
File uploadFile = new File(dir); //創建把上傳資料寫到目的檔案的物件
if (!uploadFile.exists() || uploadFile == null) { //判斷指定路徑是否存在，不存在則創建路徑
uploadFile.mkdirs();
}
String path = uploadFile.getPath() + "/" + fname;
OutputStream streamOut = new FileOutputStream(path);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = streamIn.read(buffer, 0, 8192)) != -1) {
streamOut.write(buffer, 0, bytesRead);
}
streamOut.close();
streamIn.close();
formFile.destroy();
ImageSizer.resize(new File(path), new File(path), 200, "jpg");
return fname;
}
}
三在struts的action中的代碼
FormFile file = goodsForm.getPicture(); // 獲取當前的檔
ServletCoNtext servletCoNtext = request.getSession()
.getServletCoNtext();
String dir = servletCoNtext.getRealPath("/image/goods");
String path = new uploadImage().upload(dir, file); // 實現檔的上傳的功能,並且返回上傳伺服器的路徑
四。建立相應的form，和jsp檔（代碼根據自己的需求自定）
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