图片压缩分为无损，有损压缩处理。
- 首先考虑用开源的或商业的jar包。
1.thumbnailator-0.4.2-all.jar
2.图片压缩：magickimage
Java图片处理/压缩：ImageMagick for java 使用Jmagick压缩高质量图片（包括Jmagick的应用）
ImageMagick for java 使用Jmagick压缩高质量图片j
在做pdf文档转成jpg的时候，发现了Jmagick的创建高质量的图片的一个java类库,自己以前使用另外的一个类库,感觉这个更好点,就试着用了下,感觉不错
1.使用的windows下的jmagick-win-6.3.9-Q16.zip 地址是：http://downloads.jmagick.org/6.3.9/
2.doc对应的api地址：http://downloads.jmagick.org/jmagick-doc/
3.安装ImageMagick,官方网站：http://www.imagemagick.org/
我使用的是：ImageMagick-6.4.6-4-Q16-windows-dll.exe ：点击下载
4. 安装ImageMagick-6.4.6-4-Q16-windows-dll.exe,将 安装目录下(按自己所安装的目录找) 下的所有dll文件 copy 到系统盘下的 “C:\WINDOWS\system32\”文件夹里
5. 配置环境变量
再环境变量path里添加新的值 “C:\Program Files\ImageMagick-6.4.6-4-Q16“使用IDE可以不用配置
6.解压jmagick-win-6.3.9-Q16.zip
将 jmagick.dll 复制到系统盘下的 “C:\WINDOWS\system32\”文件夹里 和 复制到jdk的bin(例“D:\jdk6\bin”)文件里各一份
将 jmagick.jar 复制到Tomcat下的lib文件夹里 和 所使用项目的WEB-INF下lib文件里 各一份
7.web应用如果部署到tomcat下，那么最好在catalina.bat文件中改变如下设置
set JAVA_OPTS=%JAVA_OPTS% -Xms256M -Xmx768M -XX:MaxPermSize=128M – Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager – Djava.util.logging.config.file=”${catalina.base}\conf\logging.properties”
避免heap溢出的问题，参数看你自己的机器而定。（ -Xms256M -Xmx768M -XX:MaxPermSize=128M ）
8.还要注意如果部署到web应用，你在使用的class里面需要
System.setProperty(“jmagick.systemclassloader”,”no”);
要不然会报出UnsatisfiedLinkError: no JMagick in java.library.path.
实例测试code：
package com.utils;
import magick.ImageInfo;
import magick.MagickApiException;
import magick.MagickException;
import magick.MagickImage;
public class Treamspdf {
public static void main(String[] args) {
resetsize("E:/mylearn/workspace/TTPDF/src/com/utils/http_imgload.jpg","new.jpg");
}
public static void resetsize(String picFrom,String picTo){
try{
ImageInfo info=new ImageInfo(picFrom);
MagickImage image=new MagickImage(new ImageInfo(picFrom));
MagickImage scaled=image.scaleImage(120, 97);
scaled.setFileName(picTo);
scaled.writeImage(info);
}catch(MagickApiException ex){
ex.printStackTrace();
} catch(MagickException ex) {
ex.printStackTrace();
}
}
}常用的水印,切图,压缩等简单程序工具类,继续下面
package com.utils;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.text.SimpleDateFormat;
import java.util.Date;
import magick.CompositeOperator;
import magick.CompressionType;
import magick.DrawInfo;
import magick.ImageInfo;
import magick.MagickException;
import magick.MagickImage;
import magick.PixelPacket;
import magick.PreviewType;
public class Aa {
static{
//不能漏掉这个，不然jmagick.jar的路径找不到
System.setProperty("jmagick.systemclassloader","no");
}
/**
* 压缩图片
* @param filePath 源文件路径
* @param toPath 缩略图路径
*/
public static void createThumbnail(String filePath, String toPath) throws MagickException{
ImageInfo info = null;
MagickImage image = null;
Dimension imageDim = null;
MagickImage scaled = null;
try{
info = new ImageInfo(filePath);
image = new MagickImage(info);
imageDim = image.getDimension();
int wideth = imageDim.width;
int height = imageDim.height;
if (wideth > height) {
height = 660 * height / wideth;
wideth = 660;
}
scaled = image.scaleImage(wideth, height);//小图片文件的大小.
scaled.setFileName(toPath);
scaled.writeImage(info);
}finally{
if(scaled != null){
scaled.destroyImages();
}
}
}
/**
* 水印(图片logo)
* @param filePath 源文件路径
* @param toImg 修改图路径
* @param logoPath logo图路径
* @throws MagickException
*/
public static void initLogoImg(String filePath, String toImg, String logoPath) throws MagickException {
ImageInfo info = new ImageInfo();
MagickImage fImage = null;
MagickImage sImage = null;
MagickImage fLogo = null;
MagickImage sLogo = null;
Dimension imageDim = null;
Dimension logoDim = null;
try {
fImage = new MagickImage(new ImageInfo(filePath));
imageDim = fImage.getDimension();
int width = imageDim.width;
int height = imageDim.height;
if (width > 660) {
height = 660 * height / width;
width = 660;
}
sImage = fImage.scaleImage(width, height);
fLogo = new MagickImage(new ImageInfo(logoPath));
logoDim = fLogo.getDimension();
int lw = width / 8;
int lh = logoDim.height * lw / logoDim.width;
sLogo = fLogo.scaleImage(lw, lh);
sImage.compositeImage(CompositeOperator.AtopCompositeOp, sLogo, width-(lw + lh/10), height-(lh + lh/10));
sImage.setFileName(toImg);
sImage.writeImage(info);
} finally {
if(sImage != null){
sImage.destroyImages();
}
}
}
/**
* 水印(文字)
* @param filePath 源文件路径
* @param toImg 修改图路径
* @param text 名字(文字内容自己随意)
* @throws MagickException
*/
public static void initTextToImg(String filePath, String toImg, String text) throws MagickException{
ImageInfo info = new ImageInfo(filePath);
if (filePath.toUpperCase().endsWith("JPG") || filePath.toUpperCase().endsWith("JPEG")) {
info.setCompression(CompressionType.JPEGCompression); //压缩类别为JPEG格式
info.setPreviewType(PreviewType.JPEGPreview); //预览格式为JPEG格式
info.setQuality(95);
}
MagickImage aImage = new MagickImage(info);
Dimension imageDim = aImage.getDimension();
int wideth = imageDim.width;
int height = imageDim.height;
if (wideth > 660) {
height = 660 * height / wideth;
wideth = 660;
}
int a = 0;
int b = 0;
String[] as = text.split("");
for (String string : as) {
if(string.matches("[\u4E00-\u9FA5]")){
a++;
}
if(string.matches("[a-zA-Z0-9]")){
b++;
}
}
int tl = a*12 + b*6 + 300;
MagickImage scaled = aImage.scaleImage(wideth, height);
if(wideth > tl && height > 5){
DrawInfo aInfo = new DrawInfo(info);
aInfo.setFill(PixelPacket.queryColorDatabase("white"));
aInfo.setUnderColor(new PixelPacket(0,0,0,100));
aInfo.setPointsize(12);
//解决中文乱码问题,自己可以去随意定义个自己喜欢字体，我在这用的微软雅黑
String fontPath = "C:/WINDOWS/Fonts/MSYH.TTF";
// String fontPath = "/usr/maindata/MSYH.TTF";
aInfo.setFont(fontPath);
aInfo.setTextAntialias(true);
aInfo.setOpacity(0);
aInfo.setText(" " + text + "于 " + new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " 上传于XXXX网，版权归作者所有！");
aInfo.setGeometry("+" + (wideth-tl) + "+" + (height-5));
scaled.annotateImage(aInfo);
}
scaled.setFileName(toImg);
scaled.writeImage(info);
scaled.destroyImages();
}
/**
* 切图
* @param imgPath 源图路径
* @param toPath 修改图路径
* @param w
* @param h
* @param x
* @param y
* @throws MagickException
*/
public static void cutImg(String imgPath, String toPath, int w, int h, int x, int y) throws MagickException {
ImageInfo infoS = null;
MagickImage image = null;
MagickImage cropped = null;
Rectangle rect = null;
try {
infoS = new ImageInfo(imgPath);
image = new MagickImage(infoS);
rect = new Rectangle(x, y, w, h);
cropped = image.cropImage(rect);
cropped.setFileName(toPath);
cropped.writeImage(infoS);
} finally {
if (cropped != null) {
cropped.destroyImages();
}
}
}
}- 其次自己写java代码：
package org.uup.web;
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;
/**
* 图像压缩工具
* @author lhj
*
*/
public class ImageSizer {
/**
* 压缩图片方法
*
* @param oldFile 将要压缩的图片
* @param width 不能超过的最大压缩宽
* @param height 不能超过的最大压缩长
* @param quality 压缩清晰度 <b>建议为1.0</b>
* @param smallIcon 压缩图片后,添加的扩展名
* @return
* @throws IOException
*/
public static void imageZip(File oldFile, File destFile, String format, int maxWidth, int maxHeight, float quality) throws IOException {
FileOutputStream out = null;
try {
// 文件不存在时
if (!oldFile.exists())
return;
/** 对服务器上的临时文件进行处理 */
Image srcFile = ImageIO.read(oldFile);
int new_w = 0, new_h = 0;
// 获取图片的实际大小 高度
int h = (int) srcFile.getHeight(null);
// 获取图片的实际大小 宽度
int w = (int) srcFile.getWidth(null);
// 为等比缩放计算输出的图片宽度及高度
if ((((double) w) > (double) maxWidth) || (((double) h) > (double) maxHeight)) {
// 为等比缩放计算输出的图片宽度及高度
double rateW = ((double) srcFile.getWidth(null)) / (double) maxWidth * 1.0;
double rateH = ((double) srcFile.getHeight(null)) / (double) maxHeight * 1.0;
// 根据缩放比率大的进行缩放控制
//double rate = rateW > rateH ? rateW : rateH;
double rate;
char zipType;
if(rateW > rateH){
rate = rateW;
zipType = 'W';
} else {
rate = rateH;
zipType = 'H';
}
new_w = (int) (((double) srcFile.getWidth(null)) / rate);
new_h = (int) (((double) srcFile.getHeight(null)) / rate);
double rate2 = 0;
if(zipType == 'W' && new_h > maxHeight){
rate = (double) new_h / (double) maxHeight * 1.0;
} else if(zipType == 'H' && new_w > maxWidth){
rate = (double) new_w / (double) maxWidth * 1.0;
}
if(rate2 != 0){
new_w = (int) (((double) new_w) / rate);
new_h = (int) (((double) new_h) / rate);
System.out.println("2次修改宽高。");
}
} else {
new_w = w;
new_h = h;
}
if ( new_w < 1 )
throw new IllegalArgumentException( "image width " + new_w + " is out of range" );
if ( new_h < 1 )
throw new IllegalArgumentException( "image height " + new_h + " is out of range" );
/** 宽,高设定 */
BufferedImage tag = new BufferedImage(new_w, new_h,
BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(srcFile, 0, 0, new_w, new_h, null);
out = new FileOutputStream(destFile);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);
/** 压缩质量 */
jep.setQuality(quality, true);
encoder.encode(tag, jep);
out.close();
srcFile.flush();
} finally{
if(out != null)out.close();
}
}
public static final MediaTracker tracker = new MediaTracker(new Component() {
private static final long serialVersionUID = 1234162663955668507L;}
);
/**方法二 * @param originalFile 原图像
* @param resizedFile 压缩后的图像
* @param width 图像宽
* @param format 图片格式 jpg, png, gif(非动画)
* @throws IOException
*/
public static void resize(File originalFile, File resizedFile, int width, String format) throws IOException {
FileInputStream fis = null;
ByteArrayOutputStream byteStream = null;
try{
if(format!=null && "gif".equals(format.toLowerCase())){
resize(originalFile, resizedFile, width, 1);
return;
}
fis = new FileInputStream(originalFile);
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);
}finally{
try {
if(byteStream != null) {
byteStream.close();
}
if(fis != null) {
fis.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/** 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 {
try {
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);
outputStream.flush();
}finally{
if(outputStream != null) {
outputStream.close();
}
}
}
/**
* 缩放gif图片
* @param originalFile 原图片
* @param resizedFile 缩放后的图片
* @param newWidth 宽度
* @param quality 缩放比例 (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);
}
/**
* 图片缩放(图片等比例缩放为指定大小，空白部分以白色填充)
*
* @param srcBufferedImage 源图片
* @param destFile缩放后的图片文件
* @param destHeight
* @param destWidth
*/
public static void zoom(BufferedImage srcBufferedImage, File destFile, String format, int destHeight, int destWidth) {
try {
int imgWidth = destWidth;
int imgHeight = destHeight;
int srcWidth = srcBufferedImage.getWidth();
int srcHeight = srcBufferedImage.getHeight();
double scaleW = destWidth * 1.0 / srcWidth;
double scaleH = destHeight * 1.0 / srcHeight;
if (scaleW >= scaleH) {
double imgWidth1 = scaleH * srcWidth;
double imgHeight1 = scaleH * srcHeight;
imgWidth = (int)imgWidth1;
imgHeight = (int)imgHeight1;
} else {
double imgWidth1 = scaleW * srcWidth;
double imgHeight1 = scaleW * srcHeight;
imgWidth = (int)imgWidth1;
imgHeight = (int)imgHeight1;
}
BufferedImage destBufferedImage = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = destBufferedImage.createGraphics();
graphics2D.setBackground(Color.WHITE);
graphics2D.clearRect(0, 0, destWidth, destHeight);
graphics2D.drawImage(srcBufferedImage.getScaledInstance(imgWidth, imgHeight, Image.SCALE_SMOOTH), (destWidth / 2) - (imgWidth / 2), (destHeight / 2) - (imgHeight / 2), null);
graphics2D.dispose();
ImageIO.write(destBufferedImage, format, destFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
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