java图片处理 (文字水印、图片水印、缩放、补白)

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; /** * 图片工具类，图片水印，文字水印，缩放，补白等 * @author Carl He */ public final class ImageUtils { /**图片格式：JPG*/ private static final String PICTRUE_FORMATE_JPG = "jpg"; private ImageUtils(){} /** * 添加图片水印 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg * @param waterImg 水印图片路径，如：C://myPictrue//logo.png * @param x 水印图片距离目标图片左侧的偏移量，如果x<0, 则在正中间 * @param y 水印图片距离目标图片上侧的偏移量，如果y<0, 则在正中间 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) */ 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); // 水印文件结束 g.dispose(); ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); } catch (IOException e) { e.printStackTrace(); } } /** * 添加文字水印 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg * @param pressText 水印文字，如：中国证券网 * @param fontName 字体名称，如：宋体 * @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC) * @param fontSize 字体大小，单位为像素 * @param color 字体颜色 * @param x 水印文字距离目标图片左侧的偏移量，如果x<0, 则在正中间 * @param y 水印文字距离目标图片上侧的偏移量，如果y<0, 则在正中间 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) */ 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(); } } /** * 获取字符长度，一个汉字作为 1 个字符, 一个英文字母作为 0.5 个字符 * @param text * @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 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; } /** * 图片缩放 * @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 = 0; //缩放比例 File f = new File(filePath); BufferedImage bi = ImageIO.read(f); Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH); //计算比例 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", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f); resize("C://pic//4.jpg", 1000, 500, true); } }

getLength 这个方法用来得到文字的长度全角一个字半角算半个字但是感觉这种方法不太好不知道有没有更好地方法~

博文来源：http://www.javaeye.com/topic/309457

java图片处理 (文字水印、图片水印、缩放、补白)

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