- import java.awt.AlphaComposite;
- import java.awt.Color;
- import java.awt.Font;
- 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 javax.imageio.ImageIO;
- /**
- * @author Eric Xu
- *
- */
- public final class ImageUtils {
- /**
- * 圖片水印
- * @param pressImg 水印圖片
- * @param targetImg 目標圖片
- * @param x 修正值 默認在中間
- * @param y 修正值 默認在中間
- * @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 = 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);
- //水印文件
- 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);
- //水印文件結束
- g.dispose();
- ImageIO.write((BufferedImage) image, "jpg", img);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 文字水印
- * @param pressText 水印文字
- * @param targetImg 目標圖片
- * @param fontName 字體名稱
- * @param fontStyle 字體樣式
- * @param color 字體顏色
- * @param fontSize 字體大小
- * @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 = 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));
- g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y);
- g.dispose();
- ImageIO.write((BufferedImage) image, "jpg", img);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 縮放
- * @param filePath 圖片路徑
- * @param height 高度
- * @param width 寬度
- * @param bb 比例不對時是否需要補白
- */
- public static void resize(String filePath, int height, int width, boolean bb) {
- try {
- double ratio = 0.0; //縮放比例
- File f = new File(filePath);
- 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) {
- 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, "jpg", f);
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- public static void main(String[] args) throws IOException {
- pressImage("G://imgtest//sy.jpg", "G://imgtest//test1.jpg", 0, 0, 0.5f);
- pressText("我是文字水印", "G://imgtest//test1.jpg", "黑體", 36, Color.white, 80, 0, 0, 0.3f);
- resize("G://imgtest//test1.jpg", 500, 500, true);
- }
- public 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;
- }
- }
給圖片加水印
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