Java基于装饰者模式实现的图片工具类实例【附demo源码下载】

/* * 装饰者模式实现图片处理工具类 * 类似java的io流 -  * Img类似低级流可以独立使用 * Press和Resize类似高级流 * 需要依赖于低级流 */package util;import java.io.File;import java.util.List;/** * 图片工具类(装饰者)和图片(被装饰者)的公共接口 * @author xlk */public interface ImgUtil {  /** 装饰方法 - 处理图片 */  List<File> dispose();}

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;/** * 抽象图片工具类 - 抽象装饰者 * @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;  }  /**   * 判断文件是不是图片   * @param file 被判断的文件   * @return 图片返回true 非图片返回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()) {//文件不是图片        return false;      }      return true;    } catch (IOException e) {      return false;    }  }}

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 - 装饰者 * @author xlk */public class Press extends AbstractImgUtil {  private  List<File>  src;   //图片路径集合  private  String    waterImg;//水印图片路径  private  Integer    x;     //水印图片距离目标图片左侧的偏移量, 如果x<0, 则在正中间  private  Integer    y;     //水印图片距离目标图片上侧的偏移量, 如果y<0, 则在正中间  private  float    alpha;   //水印透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明)  @Override  public List<File> dispose() {    src = super.dispose();    return press();  }  /** 加水印 - 具体装饰方法 */  private List<File> press() {    if (waterImg==null || "".equals(waterImg)) {      throw new RuntimeException("水印路径不能为空");    }    if (!isImg(new File(waterImg))) {      throw new RuntimeException("水印路径所指向的文件不是图片");    }    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;  }  /** 添加图片水印 */  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); // 水印文件结束      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();    }  }  /** 平铺添加图片水印 */  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方向重复次数      int rpt_y = height>height_1?(int)Math.ceil(Double.valueOf(height)/height_1):1;//y方向重复次数      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);        }      }// 水印文件结束      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();    }  }}

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;/** * 缩放 - 装饰者 * @author xlk */public class Resize extends AbstractImgUtil {  /** 比例不同边界颜色 */  private static final Color color = new Color(230,230,230);  private  List<File>  src;  //图片路径集合  private  int      height;  //处理后高度  private int      width;  //处理后宽度  private double    ratio;  //处理后高宽比  private boolean    bb;    //比例不对时是否补白  @Override  public List<File> dispose() {    src = super.dispose();    return resize();  }  /** 缩放 - 具体装饰方法 */  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;  }  /** 图片缩放-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; //缩放比例      File f = new File(src);      BufferedImage bi = ImageIO.read(f);      Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);      //计算比例      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();    }  }  /** 图片缩放-按照高宽比 */  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);      //计算尺寸      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();    }  }}

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;/** * 图片 - 原组件 * @author xlk */public class Img implements ImgUtil {  private  String  src;  //源图片或图片文件夹路径  private  String  target;  //目标文件夹路径  private  boolean  inner;  //true-包含子文件夹, false-仅当前文件夹  @Override  public List<File> dispose() {    return copy();  }  /** 复制 - 被装饰者初始状态 */  private List<File> copy() {    if (src==null || "".equals(src) || target==null || "".equals(target)) {      throw new RuntimeException("源路径或目标路径不能为空");    }    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()) {//源路径是文件夹      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)) {//源路径是图片      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;  }}