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Java图片处理 (文字水印、图片水印、缩放、补白)代码实例

时间:2019-12-24 13:25     来源/作者:java教程网
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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);
    }
}

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