Java圖片處理 (文字浮水印、圖片浮水印、縮放、補白)代碼執行個體_java

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;/** * 圖片工具類， 圖片浮水印，文字浮水印，縮放，補白等 * @author Carl He */public final class ImageUtils {/**圖片格式：JPG*/private static final String PICTRUE_FORMATE_JPG = "jpg";private ImageUtils(){}/** * 添加圖片浮水印 * @param targetImg 靶心圖表片路徑，如：C://myPictrue//1.jpg * @param waterImg 浮水印圖片路徑，如：C://myPictrue//logo.png * @param x 浮水印圖片距離靶心圖表片左側的位移量，如果x<0, 則在正中間 * @param y 浮水印圖片距離靶心圖表片上側的位移量，如果y<0, 則在正中間 * @param alpha 透明度(0.0 -- 1.0, 0.0為完全透明，1.0為完全不透明) */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));// 浮水印檔案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); // 浮水印檔案結束g.dispose();ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);} catch (IOException e) {e.printStackTrace();}}/** * 添加文字浮水印 * @param targetImg 靶心圖表片路徑，如：C://myPictrue//1.jpg * @param pressText 浮水印文字， 如：中國證券網 * @param fontName 字型名稱，如：宋體 * @param fontStyle 字型樣式，如：粗體和斜體(Font.BOLD|Font.ITALIC) * @param fontSize 字型大小，單位為像素 * @param color 字型顏色 * @param x 浮水印文字距離靶心圖表片左側的位移量，如果x<0, 則在正中間 * @param y 浮水印文字距離靶心圖表片上側的位移量，如果y<0, 則在正中間 * @param alpha 透明度(0.0 -- 1.0, 0.0為完全透明，1.0為完全不透明) */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();}}/** * 擷取字元長度，一個漢字作為 1 個字元, 一個英文字母作為 0.5 個字元 * @param text * @return 字元長度，如：text="中國",返回 2；text="test",返回 2；text="中國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;}/** * 圖片縮放 * @param filePath 圖片路徑 * @param height 高度 * @param width 寬度 * @param bb 比例不對時是否需要補白 */public static void resize(String filePath, int height, int width, boolean bb) {try {double ratio = 0; //縮放比例        File f = new File(filePath);        BufferedImage bi = ImageIO.read(f);        Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);        //計算比例        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", "宋體", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f);resize("C://pic//4.jpg", 1000, 500, true);}}