package com.raxtone.community.img.web;import java.awt.Image; import java.awt.image.BufferedImage; import java.awt.image.RenderedImage; import java.io.File; import java.io.InputStream; import java.io.OutputStream; import javax.imageio.ImageIO; /** * 图片格式 */ public class ImageUtils { /** * 缩放图片 * * @param width * 输出宽度 * @param height * 输出高度 * @param input * 输入流 * @param output * 输出流 * @param format * 输出格式 * @return * @throws Exception */ public static boolean convert(int width, int height, InputStream input, OutputStream output, String format) throws Exception { // 输入 BufferedImage inputImage = ImageIO.read(input); // 转换 RenderedImage im = (RenderedImage) convert(height, height, inputImage); // 输出 return ImageIO.write(im, format, output); } /** * 转换压缩算法 * * @param input * 输入文件 * @param output * 输出文件 * @return * @throws Exception */ public static boolean convert(File input, File output) throws Exception { // 输入 BufferedImage inputImage = ImageIO.read(input); // 转换 int width = inputImage.getWidth(); int height = inputImage.getHeight(); RenderedImage im = (RenderedImage) convert(width, height, inputImage); String outputFilename = output.getName(); String format = outputFilename.substring(outputFilename .lastIndexOf('.') + 1); // 输出 return ImageIO.write(im, format, output); } /** * 缩放图片 * * @param width * 输出宽度 * @param height * 输出高度 * @param input * 输入文件 * @param output * 输出文件 * @return * @throws Exception */ public static boolean convert(int width, int height, File input, File output) throws Exception { // 输入 BufferedImage inputImage = ImageIO.read(input); // 转换 RenderedImage im = (RenderedImage) convert(width, height, inputImage); String outputFilename = output.getName(); String format = outputFilename.substring(outputFilename .lastIndexOf('.') + 1); // 输出 return ImageIO.write(im, format, output); } /** * 缩放图片 * * @param width * 输出宽度 * @param height * 输出高度 * @param input * 输入路径 * @param output * 输出路径 * @return * @throws Exception */ public static boolean convert(int width, int height, String inputPath, String outputPath) throws Exception { return convert(width, height, new File(inputPath), new File(outputPath)); } /** * 转换 * * @param width * 输出宽度 * @param height * 输出高度 * @param input * BufferedImage * @return BufferedImage * @throws Exception */ private static BufferedImage convert(int width, int height, BufferedImage input) throws Exception { // 初始化输出图片 BufferedImage output = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 重新绘图 Image image = input.getScaledInstance(output.getWidth(), output .getHeight(), output.getType()); output.createGraphics().drawImage(image, null, null); return output; } /** * 等比缩放图片 * * @param width * 输出宽度 * @param height * 输出高度 * @param input * 输入流 * @param output * 输出流 * @return * @throws Exception */ public static boolean equimultipleConvert(int width, int height, String input, String output) throws Exception { return equimultipleConvert(width, height, new File(input), new File( output)); } /** * 等比缩放图片 * * @param width * 输出宽度 * @param height * 输出高度 * @param input * 输入流 * @param output * 输出流 * @return * * @throws Exception * */ public static boolean equimultipleConvert(int width, int height, File input, File output) throws Exception { // 输入 BufferedImage image = ImageIO.read(input); // 重新核算尺寸 if (image.getWidth() > 0 && image.getHeight() > 0) { if ((image.getWidth() / image.getHeight()) >= (width / height)) { if (image.getWidth() > width) { height = (image.getHeight() * width) / image.getWidth(); } else { width = image.getWidth(); height = image.getHeight(); } } else { if (image.getHeight() > height) { width = (image.getWidth() * height) / image.getHeight(); } else { width = image.getWidth(); height = image.getHeight(); } } } // 转换 输出 return convert(width, height, input, output); } public static void main(String[] args){ try { System.out.println(ImageUtils.convert(260, 283, "e://QQ图片//3x446230456.bmp", "e://QQ图片//3x446230456.jpg")); } catch (Exception e) { e.printStackTrace(); } }}
