package util;
import javaawtAlphaComposite;
import javaawtColor;
import javaawtFont;
import javaawtGraphicsD;
import javaawtImage;
import javaawtgeomAffineTransform;
import javaawtimageAffineTransformOp;
import javaawtimageBufferedImage;
import javaioFile;
import javaioIOException;
import javaximageioImageIO;
/**
* @author Eric Xu
*
*/
public final class ImageUtils {
/**
* 图片水印
* @param pressImg 水印图片
* @param targetImg 目标图片
* @param x 修正值 默认在中间
* @param y 修正值 默认在中间
* @param alpha 透明度
*/
public final static void pressImage(String pressImg String targetImg int x int y float alpha) {
try {
File img = new File(targetImg);
Image src = ImageIOread(img);
int wideth = srcgetWidth(null);
int height = srcgetHeight(null);
BufferedImage image = new BufferedImage(wideth height BufferedImageTYPE_INT_RGB);
GraphicsD g = imagecreateGraphics();
gdrawImage(src wideth height null);
//水印文件
Image src_biao = ImageIOread(new File(pressImg));
int wideth_biao = src_biaogetWidth(null);
int height_biao = src_biaogetHeight(null);
gsetComposite(AlphaCompositegetInstance(AlphaCompositeSRC_ATOP alpha));
gdrawImage(src_biao (wideth wideth_biao) / (height height_biao) / wideth_biao height_biao null);
//水印文件结束
gdispose();
ImageIOwrite((BufferedImage) image jpg img);
} catch (Exception e) {
eprintStackTrace();
}
}
/**
* 文字水印
* @param pressText 水印文字
* @param targetImg 目标图片
* @param fontName 字体名称
* @param fontStyle 字体样式
* @param color 字体颜色
* @param fontSize 字体大小
* @param x 修正值
* @param y 修正值
* @param alpha 透明度
*/
public static void pressText(String pressText String targetImg String fontName int fontStyle Color color int fontSize int x int y float alpha) {
try {
File img = new File(targetImg);
Image src = ImageIOread(img);
int width = srcgetWidth(null);
int height = srcgetHeight(null);
BufferedImage image = new BufferedImage(width height BufferedImageTYPE_INT_RGB);
GraphicsD g = imagecreateGraphics();
gdrawImage(src width height null);
gsetColor(color);
gsetFont(new Font(fontName fontStyle fontSize));
gsetComposite(AlphaCompositegetInstance(AlphaCompositeSRC_ATOP alpha));
gdrawString(pressText (width (getLength(pressText) * fontSize)) / + x (height fontSize) / + y);
gdispose();
ImageIOwrite((BufferedImage) image jpg img);
} catch (Exception e) {
eprintStackTrace();
}
}
/**
* 缩放
* @param filePath 图片路径
* @param height 高度
* @param width 宽度
* @param bb 比例不对时是否需要补白
*/
public static void resize(String filePath int height int width boolean bb) {
try {
double ratio = ; //缩放比例
File f = new File(filePath);
BufferedImage bi = ImageIOread(f);
Image itemp = bigetScaledInstance(width height biSCALE_SMOOTH);
//计算比例
if ((bigetHeight() > height) || (bigetWidth() > width)) {
if (bigetHeight() > bigetWidth()) {
ratio = (new Integer(height))doubleValue() / bigetHeight();
} else {
ratio = (new Integer(width))doubleValue() / bigetWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransformgetScaleInstance(ratio ratio) null);
itemp = opfilter(bi null);
}
if (bb) {
BufferedImage image = new BufferedImage(width height BufferedImageTYPE_INT_RGB);
GraphicsD g = imagecreateGraphics();
gsetColor(Colorwhite);
gfillRect( width height);
if (width == itempgetWidth(null))
gdrawImage(itemp (height itempgetHeight(null)) / itempgetWidth(null) itempgetHeight(null) Colorwhite null);
else
gdrawImage(itemp (width itempgetWidth(null)) / itempgetWidth(null) itempgetHeight(null) Colorwhite null);
gdispose();
itemp = image;
}
ImageIOwrite((BufferedImage) itemp jpg f);
} catch (IOException e) {
eprintStackTrace();
}
}
public static void main(String[] args) throws IOException {
pressImage(D:\\shuiyinpng D:\\testjpg f);
pressText(我是文字水印 D:\\testjpg 微软雅黑 Colorwhite f);
resize(D:\\testjpg true);
}
public static int getLength(String text) {
int length = ;
for (int i = ; i < textlength(); i++) {
if (new String(textcharAt(i) + )getBytes()length > ) {
length += ;
} else {
length += ;
}
}
return length / ;
}
}
