java图片处理 (文字水印、图片水印、缩放、补白)

java图片处理 (文字水印、图片水印、缩放、补白)

java图片处理 (文字水印、图片水印、缩放、补白)

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import 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 = ad(file);int width = Width(null);int height = Height(null);BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics2D g = ateGraphics();g.drawImage(image, 0, 0, width, height, null);Image waterImage = ad(new File(waterImg));    // 水印文件int width_1 = Width(null);int height_1 = Height(null);g.Instance(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 = ad(file);int width = Width(null);int height = Height(null);BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics2D g = ateGraphics();g.drawImage(image, 0, 0, width, height, null);g.setFont(new Font(fontName, fontStyle, fontSize));g.setColor(color);g.Instance(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 = ad(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 ScaleInstance(ratio, ratio), null);   itemp = op.filter(bi, null);   }   if (bb) {   BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);   Graphics2D g = ateGraphics();   g.setColor(Color.white);   g.fillRect(0, 0, width, height);   if (width == Width(null))   g.drawImage(itemp, 0, (height - Height(null)) / 2, Width(null), Height(null), Color.white, null);   else  g.drawImage(itemp, (width - Width(null)) / 2, 0, Width(null), Height(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("F://test//7.jpg", "F://test//5.png", 5000, 5000, 0.5f);
//         pressText("F://test//3.jpg", "dhh", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f);//resize("F://test//5.jpg", 1000, 500, false);}}