Java图片处理类
jopen
9年前
package com.util; import java.io.*; import java.net.URL; import java.awt.*; import java.awt.image.*; import java.awt.Graphics; import java.awt.color.ColorSpace; import javax.imageio.ImageIO; import com.config.Config; public class ImgUtil { /** * 生成图片函数 * @param imgUrl 网站地址 * @param fileURL 保存到地址 * @param fileName 文件名 */ public static String makeImg(String imgUrl, String fileURL,String fileName) { try { // 创建流 BufferedInputStream in = new BufferedInputStream(new URL(imgUrl).openStream()); // 存放地址 String filePath=fileURL + "//"+fileName; File img = new File(filePath); // 生成图片 BufferedOutputStream out = new BufferedOutputStream( new FileOutputStream(img)); byte[] buf = new byte[2048]; int length = in.read(buf); while (length != -1) { out.write(buf, 0, length); length = in.read(buf); } in.close(); out.close(); return filePath; } catch (Exception e) { e.printStackTrace(); } return ""; } /** *//** * 缩放图像 * @param srcImageFile 源图像文件地址 * @param result 缩放后的图像地址 * @param scale 缩放比例 * @param flag 缩放选择:true 放大; false 缩小; */ public static String scale(String srcImageFile, String result, int scale, boolean flag) { try { BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件 int width = src.getWidth(); // 得到源图宽 int height = src.getHeight(); // 得到源图长 if (flag) { // 放大 width = width * scale; height = height * scale; } else { // 缩小 width = width / scale; height = height / scale; } Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(image, 0, 0, null); // 绘制缩小后的图 g.dispose(); ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流 } catch (IOException e) { e.printStackTrace(); } return srcImageFile; } /** *//** * 图像切割 * @param srcImageFile 源图像地址 * @param descDir 切片目标文件夹 * @param destWidth 目标切片宽度 * @param destHeight 目标切片高度 */ public static void cut(String srcImageFile, String descDir, int destWidth, int destHeight) { try { Image img; ImageFilter cropFilter; // 读取源图像 BufferedImage bi = ImageIO.read(new File(srcImageFile)); int srcWidth = bi.getHeight(); // 源图宽度 int srcHeight = bi.getWidth(); // 源图高度 if (srcWidth > destWidth && srcHeight > destHeight) { Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); destWidth = 200; // 切片宽度 destHeight = 150; // 切片高度 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 % destWidth == 0) { cols = srcWidth / destWidth; } else { cols = (int) Math.floor(srcWidth / destWidth) + 1; } if (srcHeight % destHeight == 0) { rows = srcHeight / destHeight; } else { rows = (int) Math.floor(srcHeight / destHeight) + 1; } // 循环建立切片 // 改进的想法:是否可用多线程加快切割速度 for (int i = 0; i < rows; i++) { for (int j = 0; j < cols; j++) { // 四个参数分别为图像起点坐标和宽高 // 即: CropImageFilter(int x,int y,int width,int height) cropFilter = new CropImageFilter(j * 200, i * 150, destWidth, destHeight); img = Toolkit.getDefaultToolkit().createImage( new FilteredImageSource(image.getSource(), cropFilter)); BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(img, 0, 0, null); // 绘制缩小后的图 g.dispose(); // 输出为文件 ImageIO.write(tag, "JPEG", new File(descDir + "pre_map_" + i + "_" + j + ".jpg")); } } } } catch (Exception e) { e.printStackTrace(); } } /** *//** * 图像类型转换 GIF->JPG GIF->PNG PNG->JPG PNG->GIF(X) */ public static void convert(String source, String result) { try { File f = new File(source); f.canRead(); f.canWrite(); BufferedImage src = ImageIO.read(f); ImageIO.write(src, "JPG", new File(result)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** *//** * 彩色转为黑白 * @param source * @param result */ public static void gray(String source, String result) { try { BufferedImage src = ImageIO.read(new File(source)); ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY); ColorConvertOp op = new ColorConvertOp(cs, null); src = op.filter(src, null); ImageIO.write(src, "JPEG", new File(result)); } catch (IOException e) { e.printStackTrace(); } } public static void main(String[] args) { ImgUtil.makeImg("http://t3.qlogo.cn/mbloghead/79c1deae900c9607ceec/180", Config.SOCAIL_IMG_PATH,"3.jpg"); ImgUtil.scale("E://myeclipse//SSHWeb//WebContent//index//image//social//3.jpg","E://myeclipse//SSHWeb//WebContent//index//image//social//3.jpg",5,false); } }