Java圖片處置 (文字水印、圖片水印、縮放、補白)代碼實例。本站提示廣大學習愛好者:(Java圖片處置 (文字水印、圖片水印、縮放、補白)代碼實例)文章只能為提供參考,不一定能成為您想要的結果。以下是Java圖片處置 (文字水印、圖片水印、縮放、補白)代碼實例正文
package com.hmw.picMark; 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; /** * 圖片對象類, 圖片水印,文字水印,縮放,補白等 * @author Carl He */ public final class ImageUtils { /**圖片格局:JPG*/ private static final String PICTRUE_FORMATE_JPG = "jpg"; private ImageUtils(){} /** * 添加圖片水印 * @param targetImg 目的圖片途徑,如:C://myPictrue//1.jpg * @param waterImg 水印圖片途徑,如:C://myPictrue//logo.png * @param x 水印圖片間隔目的圖片左邊的偏移量,假如x<0, 則在正中央 * @param y 水印圖片間隔目的圖片上側的偏移量,假如y<0, 則在正中央 * @param alpha 通明度(0.0 -- 1.0, 0.0為完整通明,1.0為完整不通明) */ public final static void pressImage(String targetImg, String waterImg, int x, int y, float alpha) { try { File file = new File(targetImg); 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); // 水印文件停止 g.dispose(); ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); } catch (IOException e) { e.printStackTrace(); } } /** * 添加文字水印 * @param targetImg 目的圖片途徑,如:C://myPictrue//1.jpg * @param pressText 水印文字, 如:中國證券網 * @param fontName 字體稱號, 如:宋體 * @param fontStyle 字體款式,如:粗體和斜體(Font.BOLD|Font.ITALIC) * @param fontSize 字體年夜小,單元為像素 * @param color 字體色彩 * @param x 水印文字間隔目的圖片左邊的偏移量,假如x<0, 則在正中央 * @param y 水印文字間隔目的圖片上側的偏移量,假如y<0, 則在正中央 * @param alpha 通明度(0.0 -- 1.0, 0.0為完整通明,1.0為完整不通明) */ public static void pressText(String targetImg, String pressText, String fontName, int fontStyle, int fontSize, Color color, int x, int y, float alpha) { try { File file = new File(targetImg); 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); g.setFont(new Font(fontName, fontStyle, fontSize)); g.setColor(color); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); int width_1 = fontSize * getLength(pressText); int height_1 = fontSize; 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.drawString(pressText, x, y + height_1); g.dispose(); ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); } catch (Exception e) { e.printStackTrace(); } } /** * 獲得字符長度,一個漢字作為 1 個字符, 一個英文字母作為 0.5 個字符 * @param text * @return 字符長度,如:text="中國",前往 2;text="test",前往 2;text="中國ABC",前往 4. */ public static int getLength(String text) { int textLength = text.length(); int length = textLength; for (int i = 0; i < textLength; i++) { if (String.valueOf(text.charAt(i)).getBytes().length > 1) { length++; } } return (length % 2 == 0) ? length / 2 : length / 2 + 1; } /** * 圖片縮放 * @param filePath 圖片途徑 * @param height 高度 * @param width 寬度 * @param bb 比例纰謬時能否須要補白 */ public static void resize(String filePath, int height, int width, boolean bb) { try { double ratio = 0; //縮放比例 File f = new File(filePath); BufferedImage bi = ImageIO.read(f); Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH); //盤算比例 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("C://pic//jpg", "C://pic//test.gif", 5000, 5000, 0f); pressText("C://pic//jpg", "旺仔之印", "宋體", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f); resize("C://pic//4.jpg", 1000, 500, true); } }