图片工具类， 图片水印，文字水印，缩放，补白等

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  */ 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 {       //添加文字水印       //pressText("D:/1.jpg", "test", "宋体", Font.BOLD, 24, Color.red, 50, 50, 0.3f);       //图片缩放       resize("D:/1.jpg", 100, 600, false);       System.out.println("处理完毕！");     }      }