縮放圖像、切割圖像、圖像類型轉換、彩色轉黑白、文字水印、圖檔水印等
import
java.awt.AlphaComposite;
import
java.awt.Color;
import
java.awt.Font;
import
java.awt.Graphics;
import
java.awt.Graphics2D;
import
java.awt.Image;
import
java.awt.Toolkit;
import
java.awt.color.ColorSpace;
import
java.awt.geom.AffineTransform;
import
java.awt.image.AffineTransformOp;
import
java.awt.image.BufferedImage;
import
java.awt.image.ColorConvertOp;
import
java.awt.image.CropImageFilter;
import
java.awt.image.FilteredImageSource;
import
java.awt.image.ImageFilter;
import
java.io.File;
import
java.io.IOException;
import
javax.imageio.ImageIO;
public class ImageUtils
{
public static String IMAGE_TYPE_GIF = "gif";// 圖形交換格式
public static String IMAGE_TYPE_JPG = "jpg";// 聯合照片專家組
public static String IMAGE_TYPE_JPEG = "jpeg";//
聯合照片專家組
public static String IMAGE_TYPE_BMP = "bmp";// 英文Bitmap(位圖)的簡寫，它是Windows作業系統中的标準圖像檔案格式
public static String IMAGE_TYPE_PNG = "png";// 可移植網絡圖形
public static String IMAGE_TYPE_PSD = "psd";//
Photoshop的專用格式Photoshop
public static void main(String[] args) {
// 1-縮放圖像：
// 方法一：按比例縮放
ImageUtils.scale("e:/abc.jpg", "e:/abc_scale.jpg", 2,
true);//測試OK
// 方法二：按高度和寬度縮放
ImageUtils.scale2("e:/abc.jpg", "e:/abc_scale2.jpg", 500, 300,
true);//測試OK
// 2-切割圖像：
// 方法一：按指定起點坐标和寬高切割
ImageUtils.cut("e:/abc.jpg", "e:/abc_cut.jpg", 0, 0, 400, 400
);//測試OK
// 方法二：指定切片的行數和列數
ImageUtils.cut2("e:/abc.jpg",
"e:/", 2, 2 );//測試OK
// 方法三：指定切片的寬度和高度
ImageUtils.cut3("e:/abc.jpg", "e:/", 300, 300
);//測試OK
// 3-圖像類型轉換：
ImageUtils.convert("e:/abc.jpg", "GIF",
"e:/abc_convert.gif");//測試OK
// 4-彩色轉黑白：
ImageUtils.gray("e:/abc.jpg",
"e:/abc_gray.jpg");//測試OK
// 5-給圖檔添加文字水印：
// 方法一：
ImageUtils.pressText("我是水印文字","e:/abc.jpg","e:/abc_pressText.jpg","宋體",Font.BOLD,Color.white,80, 0, 0,
0.5f);//測試OK
// 方法二：
ImageUtils.pressText2("我也是水印文字", "e:/abc.jpg","e:/abc_pressText2.jpg",
"黑體", 36, Color.white, 80, 0, 0,
0.5f);//測試OK
// 6-給圖檔添加圖檔水印：
ImageUtils.pressImage("e:/abc2.jpg",
"e:/abc.jpg","e:/abc_pressImage.jpg", 0, 0,
0.5f);//測試OK
}
public final static void scale(String srcImageFile, String
result,
int scale, boolean flag) {
try {
BufferedImage src = ImageIO.read(new File(srcImageFile)); //
讀入檔案
int width = src.getWidth(); // 得到源圖寬
int height = src.getHeight(); // 得到源圖長
if (flag) {// 放大
width
= width * scale;
height = height * scale;
} else {// 縮小
width = width / scale;
height = height / scale;
}
//對圖檔進行縮放
Image image =
src.getScaledInstance(width, height,
Image.SCALE_DEFAULT);
BufferedImage tag = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
//Returns:a Graphics2D, which can be
used to draw into this BufferedImage
Graphics g =
tag.getGraphics();
g.drawImage(image, 0, 0, null); // 繪制縮小後的圖
g.dispose();
ImageIO.write(tag, "JPEG", new File(result));// 輸出到檔案流
} catch (IOException e) {
e.printStackTrace();
}
}
public final static void scale2(String srcImageFile, String result,
int height, int width, boolean bb) {
try {
double
ratio = 0.0; // 縮放比例
File f = new File(srcImageFile);
BufferedImage bi = ImageIO.read(f);
Image itemp = bi.getScaledInstance(width, height,
bi.SCALE_SMOOTH);
// 計算比例
if ((bi.getHeight() > height) || (bi.getWidth()
> width)) {
if (bi.getHeight() > bi.getWidth()) {
ratio = (new Integer(height)).doubleValue()
/ bi.getHeight();
} else {
ratio = (new Integer(width)).doubleValue() /
bi.getWidth();
}
AffineTransformOp op = new
AffineTransformOp(AffineTransform
.getScaleInstance(ratio, ratio), null);
itemp = op.filter(bi, null);
}
if (bb) {//補白
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.setColor(Color.white);
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.white, null);
else
g.drawImage(itemp, (width - itemp.getWidth(null)) / 2,
0,
itemp.getWidth(null), itemp.getHeight(null),
Color.white, null);
g.dispose();
itemp = image;
}
ImageIO.write((BufferedImage) itemp, "JPEG", new
File(result));
} catch (IOException e) {
e.printStackTrace();
}
}
public final static void cut(String srcImageFile, String
result,
int x, int y, int width, int height) {
try {
// 讀取源圖像
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight(); // 源圖寬度
int srcHeight = bi.getWidth(); // 源圖高度
if (srcWidth > 0 &&
srcHeight > 0) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
// 四個參數分别為圖像起點坐标和寬高
// 即: CropImageFilter(int
x,int y,int width,int height)
ImageFilter cropFilter = new CropImageFilter(x, y, width,
height);
Image img = Toolkit.getDefaultToolkit().createImage(
new FilteredImageSource(image.getSource(),
cropFilter));
BufferedImage tag = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, width, height, null); // 繪制切割後的圖
g.dispose();
// 輸出為檔案
ImageIO.write(tag, "JPEG", new File(result));
}
} catch (Exception e) {
e.printStackTrace();
}
}
public final static void cut2(String srcImageFile, String
descDir,
int rows, int cols) {
try {
if(rows<=0||rows>20) rows = 2;
// 切片行數
if(cols<=0||cols>20) cols = 2;
// 切片列數
// 讀取源圖像
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight(); // 源圖寬度
int srcHeight = bi.getWidth(); // 源圖高度
if (srcWidth > 0 &&
srcHeight > 0) {
Image img;
ImageFilter cropFilter;
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
int destWidth = srcWidth; // 每張切片的寬度
int destHeight = srcHeight; // 每張切片的高度
// 計算切片的寬度和高度
if (srcWidth % cols == 0) {
destWidth = srcWidth / cols;
}
else {
destWidth = (int) Math.floor(srcWidth / cols) + 1;
}
if (srcHeight % rows == 0) {
destHeight = srcHeight / rows;
} else {
destHeight = (int) Math.floor(srcWidth / rows) + 1;
}
// 循環建立切片
// 改進的想法:是否可用多線程加快切割速度
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
// 四個參數分别為圖像起點坐标和寬高
// 即: CropImageFilter(int
x,int y,int width,int height)
cropFilter = new CropImageFilter(j * destWidth, i *
destHeight,
destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(
new
FilteredImageSource(image.getSource(),
cropFilter));
BufferedImage tag = new BufferedImage(destWidth,
destHeight, BufferedImage.TYPE_INT_RGB);
Graphics
g = tag.getGraphics();
g.drawImage(img, 0, 0, null); // 繪制縮小後的圖
g.dispose();
// 輸出為檔案
ImageIO.write(tag, "JPEG", new File(descDir
+
"_r" + i + "_c" + j + ".jpg"));
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public final static void cut3(String srcImageFile, String
descDir,
int destWidth, int destHeight) {
try {
if(destWidth<=0)
destWidth = 200; // 切片寬度
if(destHeight<=0) destHeight = 150; //
切片高度
// 讀取源圖像
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight(); // 源圖寬度
int
srcHeight = bi.getWidth(); // 源圖高度
if (srcWidth > destWidth
&& srcHeight >
destHeight) {
Image img;
ImageFilter cropFilter;
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
int cols = 0; // 切片橫向數量
int rows = 0; // 切片縱向數量
// 計算切片的橫向和縱向數量
if (srcWidth % destWidth == 0) {
cols = srcWidth / destWidth;
} else {
cols
= (int) Math.floor(srcWidth / destWidth) + 1;
}
if (srcHeight % destHeight == 0) {
rows = srcHeight / destHeight;
} else {
rows = (int) Math.floor(srcHeight / destHeight) + 1;
}
// 循環建立切片
// 改進的想法:是否可用多線程加快切割速度
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
// 四個參數分别為圖像起點坐标和寬高
//
即: CropImageFilter(int
x,int y,int width,int height)
cropFilter = new CropImageFilter(j * destWidth, i *
destHeight,
destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(
new FilteredImageSource(image.getSource(),
cropFilter));
BufferedImage tag = new BufferedImage(destWidth,
destHeight,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null); // 繪制縮小後的圖
g.dispose();
// 輸出為檔案
ImageIO.write(tag,
"JPEG", new File(descDir
+ "_r" + i + "_c" + j + ".jpg"));
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public final static void convert(String srcImageFile, String
formatName, String destImageFile) {
try {
File f = new File(srcImageFile);
f.canRead();
f.canWrite();
BufferedImage src = ImageIO.read(f);
ImageIO.write(src, formatName, new File(destImageFile));
} catch (Exception e) {
e.printStackTrace();
}
}
public final static void gray(String srcImageFile, String
destImageFile) {
try {
BufferedImage src = ImageIO.read(new
File(srcImageFile));
ColorSpace cs =
ColorSpace.getInstance(ColorSpace.CS_GRAY);
ColorConvertOp op = new ColorConvertOp(cs, null);
src = op.filter(src, null);
ImageIO.write(src, "JPEG", new File(destImageFile));
} catch (IOException e) {
e.printStackTrace();
}
}
public final static void pressText(String pressText,
String srcImageFile, String destImageFile, String
fontName,
int fontStyle, Color color, int fontSize,int x,
int y, float alpha) {
try {
File img = new File(srcImageFile);
Image src = ImageIO.read(img);
int width = src.getWidth(null);
int height = src.getHeight(null);
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(src, 0, 0, width, height, null);
g.setColor(color);
g.setFont(new Font(fontName, fontStyle, fontSize));
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
// 在指定坐标繪制水印文字
g.drawString(pressText, (width - (getLength(pressText) *
fontSize))
/ 2 + x, (height - fontSize) / 2 + y);
g.dispose();
ImageIO.write((BufferedImage) image, "JPEG", new
File(destImageFile));// 輸出到檔案流
} catch (Exception e) {
e.printStackTrace();
}
}
public final static void pressText2(String pressText, String
srcImageFile,String destImageFile,
String fontName, int fontStyle, Color color, int fontSize, int
x,
int y, float alpha) {
try {
File img = new File(srcImageFile);
Image src = ImageIO.read(img);
int width = src.getWidth(null);
int height = src.getHeight(null);
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(src, 0, 0, width, height, null);
g.setColor(color);
g.setFont(new Font(fontName, fontStyle, fontSize));
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
// 在指定坐标繪制水印文字
g.drawString(pressText, (width - (getLength(pressText) *
fontSize))
/ 2 + x, (height - fontSize) / 2 + y);
g.dispose();
ImageIO.write((BufferedImage) image, "JPEG", new
File(destImageFile));
} catch (Exception e) {
e.printStackTrace();
}
}
public final static void pressImage(String pressImg, String
srcImageFile,String destImageFile,
int x, int y, float alpha) {
try {
File img = new File(srcImageFile);
Image src = ImageIO.read(img);
int wideth = src.getWidth(null);
int height = src.getHeight(null);
BufferedImage image = new BufferedImage(wideth, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(src, 0, 0, wideth, height, null);
// 水印檔案
Image src_biao = ImageIO.read(new File(pressImg));
int wideth_biao = src_biao.getWidth(null);
int height_biao = src_biao.getHeight(null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
g.drawImage(src_biao, (wideth - wideth_biao) / 2,
(height - height_biao) / 2, wideth_biao, height_biao,
null);
// 水印檔案結束
g.dispose();
ImageIO.write((BufferedImage) image, "JPEG", new
File(destImageFile));
} catch (Exception e) {
e.printStackTrace();
}
}
public final static int getLength(String text) {
int length = 0;
for (int i = 0; i < text.length(); i++) {
if (new String(text.charAt(i) + "").getBytes().length
> 1) {
length += 2;
} else {
length += 1;
}
}
return
length / 2;
}
}