package com.yjf.image;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
* 图片工具类，主要针对图片水印处理
*
* @author 025079
* @version [版本号, 2011-11-28]
* @see [相关类/方法]
* @since [产品/模块版本]
*/
public class ImageHelper {
// 项目根目录路径
public static final String path = System.getProperty("user.dir");
/**
* 生成缩略图 <br/>
* 保存:ImageIO.write(BufferedImage, imgType[jpg/png/...], File);
*
* @param source
* 原图片
* @param width
* 缩略图宽
* @param height
* 缩略图高
* @param b
* 是否等比缩放
* */
public static BufferedImage thumb(BufferedImage source, int width,
int height, boolean b) {
// targetW，targetH分别表示目标长和宽
int type = source.getType();
BufferedImage target = null;
double sx = (double) width / source.getWidth();
double sy = (double) height / source.getHeight();
if (b) {
if (sx > sy) {
sx = sy;
width = (int) (sx * source.getWidth());
} else {
sy = sx;
height = (int) (sy * source.getHeight());
}
}
if (type == BufferedImage.TYPE_CUSTOM) { // handmade
ColorModel cm = source.getColorModel();
WritableRaster raster = cm.createCompatibleWritableRaster(width,
height);
boolean alphaPremultiplied = cm.isAlphaPremultiplied();
target = new BufferedImage(cm, raster, alphaPremultiplied, null);
} else
target = new BufferedImage(width, height, type);
Graphics2D g = target.createGraphics();
// smoother than exlax:
g.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
g.dispose();
return target;
}
/**
* 图片水印
*
* @param imgPath
* 待处理图片
* @param markPath
* 水印图片
* @param x
* 水印位于图片左上角的 x 坐标值
* @param y
* 水印位于图片左上角的 y 坐标值
* @param alpha
* 水印透明度 0.1f ~ 1.0f
* */
public static void waterMark(String imgPath, String markPath, int x, int y,
float alpha) {
try {
// 加载待处理图片文件
Image img = ImageIO.read(new File(imgPath));
BufferedImage image = new BufferedImage(img.getWidth(null),
img.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(img, 0, 0, null);
// 加载水印图片文件
Image src_biao = ImageIO.read(new File(markPath));
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
g.drawImage(src_biao, x, y, null);
g.dispose();
// 保存处理后的文件
FileOutputStream out = new FileOutputStream(imgPath);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 文字水印
*
* @param imgPath
* 待处理图片
* @param text
* 水印文字
* @param font
* 水印字体信息
* @param color
* 水印字体颜色
* @param x
* 水印位于图片左上角的 x 坐标值
* @param y
* 水印位于图片左上角的 y 坐标值
* @param alpha
* 水印透明度 0.1f ~ 1.0f
*/
public static void textMark(String imgPath, String text, Font font,
Color color, int x, int y, float alpha) {
try {
Font Dfont = (font == null) ? new Font("宋体", 20, 13) : font;
Image img = ImageIO.read(new File(imgPath));
BufferedImage image = new BufferedImage(img.getWidth(null),
img.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(img, 0, 0, null);
g.setColor(color);
g.setFont(Dfont);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
g.drawString(text, x, y);
g.dispose();
FileOutputStream out = new FileOutputStream(imgPath);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
} catch (Exception e) {
System.out.println(e);
}
}
/**
* 读取JPEG图片
* @param filename 文件名
* @return BufferedImage 图片对象
*/
public static BufferedImage readJPEGImage(String filename)
{
try {
InputStream imageIn = new FileInputStream(new File(filename));
// 得到输入的编码器，将文件流进行jpg格式编码
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(imageIn);
// 得到编码后的图片对象
BufferedImage sourceImage = decoder.decodeAsBufferedImage();
return sourceImage;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (ImageFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 读取JPEG图片
* @param filename 文件名
* @return BufferedImage 图片对象
*/
public static BufferedImage readPNGImage(String filename)
{
try {
File inputFile = new File(filename);
BufferedImage sourceImage = ImageIO.read(inputFile);
return sourceImage;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (ImageFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 灰度值计算
* @param pixels 像素
* @return int 灰度值
*/
public static int rgbToGray(int pixels) {
// int _alpha = (pixels >> 24) & 0xFF;
int _red = (pixels >> 16) & 0xFF;
int _green = (pixels >> 8) & 0xFF;
int _blue = (pixels) & 0xFF;
return (int) (0.3 * _red + 0.59 * _green + 0.11 * _blue);
}
/**
* 计算数组的平均值
* @param pixels 数组
* @return int 平均值
*/
public static int average(int[] pixels) {
float m = 0;
for (int i = 0; i < pixels.length; ++i) {
m += pixels[i];
}
m = m / pixels.length;
return (int) m;
}
}