本文实例讲述了java基于装饰者模式实现的图片工具类。分享给大家供大家参考，具体如下：
imgutil.java：
我要评论
/*
* 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();
}
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;
}
}
}
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 - 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();
}
}
}
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;
/**
* 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();
}
}
}
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;
/**
* 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;
}
}
附：完整实例代码点击此处。
更多java相关内容感兴趣的读者可查看本站专题：《java面向对象程序设计入门与进阶教程》、《java数据结构与算法教程》、《java操作dom节点技巧总结》、《java文件与目录操作技巧汇总》和《java缓存操作技巧汇总》
希望本文所述对大家java程序设计有所帮助。
如对本文有疑问， 点击进行留言回复！！
【奥鹏作业答案库网】大工20春《应用统计》在线作业1【奥鹏作业答案】
网友评论