Java图片处理方法大全

下面是本人结合网上代码整理出来的Java中处理图片的一些方法,其中包括了图片缩放、图片切割、图片水印、文字水印等(看看这里):

package com.suyun.util;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Toolkit;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.awt.image.CropImageFilter;import java.awt.image.FilteredImageSource;import java.awt.image.ImageFilter;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.ImageFormatException;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class JPEGUtil {/** * 根据原图生成缩略图 * @param srcImg 原图路径 * @param destImg 缩略图路径 */public static void createSmallImage(String srcImg,String destImg){try {File file = new File(srcImg);Image src = ImageIO.read(file);int width = src.getWidth(null);int height = src.getHeight(null);BufferedImage tagImage = new BufferedImage(width/2,height/2,BufferedImage.TYPE_BYTE_GRAY);Graphics2D g2d = tagImage.createGraphics();g2d.rotate(0.5d); //进行图片旋转处理g2d.drawImage(src, 0, 0, width/2, height/2, null);g2d.drawString("缩略图", width/2-50, height/2-15);FileOutputStream output = new FileOutputStream(destImg);JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output);encoder.encode(tagImage);output.flush();output.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (ImageFormatException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}/** * 进行图片切割 * @param srcFileName 原始图片 * @param descFileName 目标图片 * @param descWidth 目标宽度 * @param descHeight 目标高度 */public static void cutImage(String srcFileName,String descFileName,int descWidth,int descHeight){File srcFile = new File(srcFileName);File descFile = new File(descFileName);Image cropImg = null;ImageFilter cropFilter = null;try {BufferedImage bufferImg = ImageIO.read(srcFile);int srcWidth = bufferImg.getWidth();int srcHeight = bufferImg.getHeight();if(srcWidth>descWidth && srcHeight>descHeight){Image img = bufferImg.getScaledInstance(srcWidth, srcHeight, Image.SCALE_SMOOTH);//descWidth = 200;//descHeight = 150;int cols = 0; // 切片横向数量int rows = 0; // 切片纵向数量// 计算切片的横向和纵向数量if(srcWidth%descWidth==0){cols = srcWidth/descWidth;}else{cols = (int)Math.floor(srcWidth/descWidth)+1;}if(srcHeight%descHeight==0){rows = srcHeight/descHeight;}else{rows = (int)Math.floor(srcHeight/descHeight)+1;}for(int i=0;i<rows;i++){for(int j=0;j<cols;j++){cropFilter = new CropImageFilter(200*j,150*i,descWidth,descHeight);cropImg = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(img.getSource(),cropFilter));BufferedImage tag = new BufferedImage(descWidth,descHeight,BufferedImage.TYPE_INT_RGB);Graphics g = tag.getGraphics();g.drawImage(img, 0,0, null);g.dispose();ImageIO.write(tag, "JPEG", descFile);}}}} catch (IOException e) {e.printStackTrace();}}/** * 给图片添加图片水印 * @param pressImg 水印图片 * @param targetImg 目标图片 * @param x 修正值,默认在中间 * @param y 修正值,默认在中间 * @param alpha 透明度 */public static void pressImage(String pressImg,String targetImg,int x,int y,float alpha){File pressFile = new File(pressImg);File targetFile = new File(targetImg);try {Image src = ImageIO.read(targetFile);int srcWidth = src.getWidth(null);int srcHeight = src.getHeight(null);BufferedImage image = new BufferedImage(srcWidth,srcHeight,BufferedImage.TYPE_INT_BGR);Graphics2D g2d = image.createGraphics();g2d.drawImage(src, 0, 0, srcWidth, srcHeight, null);Image dest = ImageIO.read(pressFile);int destWidth = dest.getWidth(null);int destHeight = dest.getHeight(null);g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,alpha));g2d.drawImage(dest, (srcWidth-destWidth)/2, (srcHeight-destHeight)/2, destWidth, destHeight, null);g2d.dispose();ImageIO.write(image, "JPG", targetFile);} catch (IOException e) {e.printStackTrace();}}/** * 给图片添加文字水印 * @param pressText 水印文字 * @param targetImg 目标图片 * @param fontName 字体名称 * @param fontStyle 字体样式 * @param color 字体颜色 * @param fontSize 字体大小 * @param x 修正值 * @param y 修正值 * @param alpha 透明度 */public static void pressText(String pressText,String targetImg,String fontName,int fontStyle,Color color,int fontSize,int x,int y,float alpha){File targetFile = new File(targetImg);try {Image src = ImageIO.read(targetFile);int width = src.getWidth(null);int height = src.getHeight(null);BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);Graphics2D g2d = image.createGraphics();g2d.drawImage(src, 0, 0, width, height,null);g2d.setColor(color);g2d.setFont(new Font(fontName,fontStyle,fontSize));g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,alpha));g2d.drawString(pressText, (width-getLength(pressText)*fontSize)/2+x, (height-fontSize)/2+y);g2d.dispose();ImageIO.write(image, "JPG", targetFile);} catch (IOException e) {e.printStackTrace();}}/** * 获得字符实际字节数 * @param text * @return */public static int getLength(String text){int length = 0;for(int i=0;i<text.length();i++){if(new String(text.charAt(i)+"").getBytes().length>1){length += 2;}else{length += 1;}}return length/2;}public static void main(String[] args) {JPEGUtil.createSmallImage("D:/dog17.jpg","D:/small4.jpg");//JPEGUtil.cutImage("D:/dog17.jpg", "D:/cutDog.jpg", 400, 300);//JPEGUtil.pressText("可爱的狗狗", "D:/small2.jpg", "楷体", Font.BOLD, Color.PINK, 14, 5, 5, 0.7f);}}