Java基于裝飾者模式實(shí)現(xiàn)的圖片工具類實(shí)例【附demo源碼下載】
本文實(shí)例講述了Java基于裝飾者模式實(shí)現(xiàn)的圖片工具類。分享給大家供大家參考,具體如下:
ImgUtil.java:
/*
* 裝飾者模式實(shí)現(xiàn)圖片處理工具類
* 類似java的io流 -
* Img類似低級流可以獨(dú)立使用
* Press和Resize類似高級流
* 需要依賴于低級流
*/
package util;
import java.io.File;
import java.util.List;
/**
* 圖片工具類(裝飾者)和圖片(被裝飾者)的公共接口
* @author xlk
*/
public interface ImgUtil {
/** 裝飾方法 - 處理圖片 */
List<File> dispose();
}
AbstractImgUtil.java:
package util;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
/**
* 抽象圖片工具類 - 抽象裝飾者
* @author xlk
*/
public abstract class AbstractImgUtil implements ImgUtil {
private ImgUtil imgUtil;
@Override
public List<File> dispose() {
return imgUtil.dispose();
}
public AbstractImgUtil(){}
public AbstractImgUtil(ImgUtil imgUtil) {
this.imgUtil = imgUtil;
}
/**
* 判斷文件是不是圖片
* @param file 被判斷的文件
* @return 圖片返回true 非圖片返回false
* @throws IOException
*/
public static boolean isImg(File file) {
if (file.isDirectory()) {
return false;
}
try {
ImageInputStream iis = ImageIO.createImageInputStream(file);
Iterator<ImageReader> iter = ImageIO.getImageReaders(iis);
if (!iter.hasNext()) {//文件不是圖片
return false;
}
return true;
} catch (IOException e) {
return false;
}
}
}
Press.java:
package util;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.imageio.ImageIO;
/**
* 加水印 - 裝飾者
* @author xlk
*/
public class Press extends AbstractImgUtil {
private List<File> src; //圖片路徑集合
private String waterImg;//水印圖片路徑
private Integer x; //水印圖片距離目標(biāo)圖片左側(cè)的偏移量, 如果x<0, 則在正中間
private Integer y; //水印圖片距離目標(biāo)圖片上側(cè)的偏移量, 如果y<0, 則在正中間
private float alpha; //水印透明度(0.0 -- 1.0, 0.0為完全透明,1.0為完全不透明)
@Override
public List<File> dispose() {
src = super.dispose();
return press();
}
/** 加水印 - 具體裝飾方法 */
private List<File> press() {
if (waterImg==null || "".equals(waterImg)) {
throw new RuntimeException("水印路徑不能為空");
}
if (!isImg(new File(waterImg))) {
throw new RuntimeException("水印路徑所指向的文件不是圖片");
}
if (src.size()<=0) {
return src;
}
if (x!=null && y!=null) {
for (File f: src) {
press(f.getPath(), waterImg, f.getParent(), x, y, alpha);
}
} else {
for (File f: src) {
press(f.getPath(), waterImg, f.getParent(), alpha);
}
}
return src;
}
public Press() {}
public Press(ImgUtil imgUtil, String waterImg, float alpha) {
super(imgUtil);
this.waterImg = waterImg;
this.alpha = alpha;
}
public Press(ImgUtil imgUtil, String waterImg, Integer x, Integer y, float alpha) {
super(imgUtil);
this.waterImg = waterImg;
this.x = x;
this.y = y;
this.alpha = alpha;
}
public String getWaterImg() {
return waterImg;
}
public void setWaterImg(String waterImg) {
this.waterImg = waterImg;
}
public Integer getX() {
return x;
}
public void setX(Integer x) {
this.x = x;
}
public Integer getY() {
return y;
}
public void setY(Integer y) {
this.y = y;
}
public float getAlpha() {
return alpha;
}
public void setAlpha(float alpha) {
this.alpha = alpha;
}
/** 添加圖片水印 */
private static void press(String src, String waterImg, String target, int x, int y, float alpha) {
File newFile = null;
try {
File file = new File(src);
Image image = ImageIO.read(file);
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
Image waterImage = ImageIO.read(new File(waterImg)); // 水印文件
int width_1 = waterImage.getWidth(null);
int height_1 = waterImage.getHeight(null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int widthDiff = width - width_1;
int heightDiff = height - height_1;
if (x < 0) {
x = widthDiff / 2;
} else if (x > widthDiff) {
x = widthDiff;
}
if (y < 0) {
y = heightDiff / 2;
} else if (y > heightDiff) {
y = heightDiff;
}
g.drawImage(waterImage, x, y, width_1, height_1, null); // 水印文件結(jié)束
g.dispose();
File dir = new File(target);
if (!dir.exists()) {
dir.mkdirs();
}
newFile = new File(target + File.separator + file.getName());
ImageIO.write(bufferedImage, "jpg", newFile);
} catch (IOException e) {
e.printStackTrace();
}
}
/** 平鋪添加圖片水印 */
private static void press(String src, String waterImg, String target, float alpha) {
File newFile = null;
try {
File file = new File(src);
Image image = ImageIO.read(file);
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufferedImage.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
Image waterImage = ImageIO.read(new File(waterImg)); // 水印文件
int width_1 = waterImage.getWidth(null);
int height_1 = waterImage.getHeight(null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
int rpt_x = width>width_1?(int)Math.ceil(Double.valueOf(width)/width_1):1;//x方向重復(fù)次數(shù)
int rpt_y = height>height_1?(int)Math.ceil(Double.valueOf(height)/height_1):1;//y方向重復(fù)次數(shù)
for (int i=0; i<rpt_x; i++) {
for (int j=0; j<rpt_y; j++) {
g.drawImage(waterImage, i*width_1, j*height_1, width_1, height_1, null);
}
}// 水印文件結(jié)束
g.dispose();
File dir = new File(target);
if (!dir.exists()) {
dir.mkdirs();
}
newFile = new File(target + File.separator + file.getName());
ImageIO.write(bufferedImage, "jpg", newFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
Resize.java:
package util;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.imageio.ImageIO;
/**
* 縮放 - 裝飾者
* @author xlk
*/
public class Resize extends AbstractImgUtil {
/** 比例不同邊界顏色 */
private static final Color color = new Color(230,230,230);
private List<File> src; //圖片路徑集合
private int height; //處理后高度
private int width; //處理后寬度
private double ratio; //處理后高寬比
private boolean bb; //比例不對時是否補(bǔ)白
@Override
public List<File> dispose() {
src = super.dispose();
return resize();
}
/** 縮放 - 具體裝飾方法 */
private List<File> resize() {
if (src.size()<=0) {
return src;
}
if (ratio>0) {
for (File f: src) {
resize(f.getPath(), f.getParent(), ratio, bb);
}
} else if (height>0 && width>0) {
for (File f: src) {
resize(f.getPath(), f.getParent(), height, width, bb);
}
}
return src;
}
public Resize() {}
public Resize(ImgUtil imgUtil, int height, int width, boolean bb) {
super(imgUtil);
this.height = height;
this.width = width;
this.bb = bb;
}
public Resize(ImgUtil imgUtil, double ratio, boolean bb) {
super(imgUtil);
this.ratio = ratio;
this.bb = bb;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public double getRatio() {
return ratio;
}
public void setRatio(double ratio) {
this.ratio = ratio;
}
public boolean isBb() {
return bb;
}
public void setBb(boolean bb) {
this.bb = bb;
}
/** 圖片縮放-按照尺寸 */
private static void resize(String src, String target, int height, int width, boolean bb) {
File newFile = null;
try {
double ratio = 0; //縮放比例
File f = new File(src);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
//計算比例
if (Double.valueOf(bi.getHeight())/bi.getWidth() > Double.valueOf(height)/width) {
ratio = Double.valueOf(height) / bi.getHeight();
} else {
ratio = Double.valueOf(width) / bi.getWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
itemp = op.filter(bi, null);
if (bb) {
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(color);
g.fillRect(0, 0, width, height);
if (width == itemp.getWidth(null))
g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), color, null);
else
g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), color, null);
g.dispose();
itemp = image;
}
File dir = new File(target);
if (!dir.exists()) {
dir.mkdirs();
}
newFile = new File(target + File.separator + f.getName());
ImageIO.write((BufferedImage) itemp, "jpg", newFile);
} catch (IOException e) {
e.printStackTrace();
}
}
/** 圖片縮放-按照高寬比 */
private static void resize(String src, String target, double ratio, boolean bb) {
File newFile = null;
try {
File f = new File(src);
BufferedImage bi = ImageIO.read(f);
//計算尺寸
int width = bi.getWidth();
int height = bi.getHeight();
if (Double.valueOf(height)/width<ratio) {
height = (int)(width*ratio);
} else {
width = (int)(Double.valueOf(height)/ratio);
}
Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(1, 1), null);
itemp = op.filter(bi, null);
if (bb) {
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(color);
g.fillRect(0, 0, width, height);
if (width == itemp.getWidth(null))
g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), color, null);
else
g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), color, null);
g.dispose();
itemp = image;
}
File dir = new File(target);
if (!dir.exists()) {
dir.mkdirs();
}
newFile = new File(target + File.separator + f.getName());
ImageIO.write((BufferedImage) itemp, "jpg", newFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
Img.java:
package util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* 圖片 - 原組件
* @author xlk
*/
public class Img implements ImgUtil {
private String src; //源圖片或圖片文件夾路徑
private String target; //目標(biāo)文件夾路徑
private boolean inner; //true-包含子文件夾, false-僅當(dāng)前文件夾
@Override
public List<File> dispose() {
return copy();
}
/** 復(fù)制 - 被裝飾者初始狀態(tài) */
private List<File> copy() {
if (src==null || "".equals(src) || target==null || "".equals(target)) {
throw new RuntimeException("源路徑或目標(biāo)路徑不能為空");
}
File srcFile = new File(src);
List<File> list = new ArrayList<File>();
File targetDir = new File(target);
if (!targetDir.exists()) {
targetDir.mkdirs();
}
a:
if (srcFile.isDirectory()) {//源路徑是文件夾
File[] subs = srcFile.listFiles();
if (subs.length<=0) {
break a;
}
for (File sub: subs) {
if (sub.isDirectory() && inner) {
list.addAll(new Img(sub.getPath(), target+File.separator+sub.getName(), true).copy());
} else if (AbstractImgUtil.isImg(sub)) {
list.add(copy(sub, target));
}
}
} else if (AbstractImgUtil.isImg(srcFile)) {//源路徑是圖片
list.add(copy(srcFile, target));
}
return list;
}
private File copy(File file, String target) {
FileInputStream fis = null;
FileOutputStream fos = null;
File newFile = null;
try {
fis = new FileInputStream(file);
newFile = new File(target + File.separator + file.getName());
fos = new FileOutputStream(newFile);
byte[] bs = new byte[1024*10];
int len = -1;
while ((len=fis.read(bs))!=-1) {
fos.write(bs, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (fis!=null) {
fis.close();
}
if (fos!=null) {
fos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return newFile;
}
public Img() {}
public Img(String src, String target) {
this.src = src;
this.target = target;
}
public Img(String src, String target, boolean inner) {
this.src = src;
this.target = target;
this.inner = inner;
}
public String getSrc() {
return src;
}
public void setSrc(String src) {
this.src = src;
}
public String getTarget() {
return target;
}
public void setTarget(String target) {
this.target = target;
}
public boolean isInner() {
return inner;
}
public void setInner(boolean inner) {
this.inner = inner;
}
}
附:完整實(shí)例代碼點(diǎn)擊此處本站下載。
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