图片常用操作代码,Java代码库,德仔网

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【Java】图片常用操作
作者:狙击手 / 发布于2015/1/12/ 406

	package com.sniper.survey.util;
	
	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";
	
	 public 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);
	 System.out.println(width);
	 System.out.println(height);
	 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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