示例图:
建议：图片压缩一下。
代码：
package list.test;import java.awt.image.BufferedImage;import java.io.BufferedWriter;import java.io.File;import java.io.FileWriter;import java.io.IOException; import javax.imageio.ImageIO; /** * @author 东哥 2016年10月27日 * */ public class AsciiPic { /** * @param path * 图片路径 */ public static void createAsciiPic(final String path) { //final String base = "\"@#&$%*o!;.";// 字符串由复杂到简单 final String base = "#8XOHLTI)i=+;:,. ";// 字符串由复杂到简单 try { final BufferedImage image = ImageIO.read(new File(path)); //读取图片 //输出到指定文件中 final BufferedWriter fos = new BufferedWriter(new FileWriter("D:\\\\abc.txt",false)); //true表示是否追加 for (int y = 0; y < image.getHeight(); y += 2) { for (int x = 0; x < image.getWidth(); x++) { final int pixel = image.getRGB(x, y); final int r = (pixel & 0xff0000) >> 16, g = (pixel & 0xff00) >> 8, b = pixel & 0xff; final float gray = 0.299f * r + 0.578f * g + 0.114f * b; final int index = Math.round(gray * (base.length() + 1) / 255); String s = index >= base.length() ? " " : String.valueOf(base.charAt(index)); System.out.print(s); fos.write(s); } fos.newLine(); System.out.println(); } fos.close(); } catch (final IOException e) { e.printStackTrace(); } } /** * test * * @param args */ public static void main(final String[] args) { AsciiPic.createAsciiPic("D:\\ABC.jpg"); } } java实现图片转ascii字符画
参考 ：https://blog.csdn.net/renhd_1987/article/details/52948978
图片压缩：
package list.test;import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.RenderingHints; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.awt.image.WritableRaster; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import javax.imageio.ImageIO; /** * 图片工具类，完成图片的截取 * 所有方法返回值均未boolean型 */ public class ImageHelper { /** * 实现图像的等比缩放 * @param source * @param targetW * @param targetH * @return */ private static BufferedImage resize(BufferedImage source, int targetW, int targetH) { // targetW，targetH分别表示目标长和宽 int type = source.getType(); BufferedImage target = null; double sx = (double) targetW / source.getWidth(); double sy = (double) targetH / source.getHeight(); // 这里想实现在targetW，targetH范围内实现等比缩放。如果不需要等比缩放 // 则将下面的if else语句注释即可 if (sx < sy) { sx = sy; targetW = (int) (sx * source.getWidth()); } else { sy = sx; targetH = (int) (sy * source.getHeight()); } if (type == BufferedImage.TYPE_CUSTOM) { // handmade ColorModel cm = source.getColorModel(); WritableRaster raster = cm.createCompatibleWritableRaster(targetW, targetH); boolean alphaPremultiplied = cm.isAlphaPremultiplied(); target = new BufferedImage(cm, raster, alphaPremultiplied, null); } else target = new BufferedImage(targetW, targetH, type); Graphics2D g = target.createGraphics(); // smoother than exlax: g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy)); g.dispose(); return target; } /** * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false * @param inFilePath 要截取文件的路径 * @param outFilePath 截取后输出的路径 * @param width 要截取宽度 * @param hight 要截取的高度 * @throws Exception */ public static boolean compress(String inFilePath, String outFilePath, int width, int hight) { boolean ret = false; File file = new File(inFilePath); File saveFile = new File(outFilePath); InputStream in = null; try { in = new FileInputStream(file); ret = compress(in, saveFile, width, hight); } catch (FileNotFoundException e) { e.printStackTrace(); ret = false; } finally{ if(null != in){ try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } return ret; } /** * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false * @param in 要截取文件流 * @param outFilePath 截取后输出的路径 * @param width 要截取宽度 * @param hight 要截取的高度 * @throws Exception */ public static boolean compress(InputStream in, File saveFile, int width, int hight) { // boolean ret = false; BufferedImage srcImage = null; try { srcImage = ImageIO.read(in); } catch (IOException e) { e.printStackTrace(); return false; } if (width > 0 || hight > 0) { // 原图的大小 int sw = srcImage.getWidth(); int sh = srcImage.getHeight(); // 如果原图像的大小小于要缩放的图像大小，直接将要缩放的图像复制过去 if (sw > width && sh > hight) { srcImage = resize(srcImage, width, hight); } else { String fileName = saveFile.getName(); String formatName = fileName.substring(fileName .lastIndexOf('.') + 1); try { ImageIO.write(srcImage, formatName, saveFile); } catch (IOException e) { e.printStackTrace(); return false; } return true; } } // 缩放后的图像的宽和高 int w = srcImage.getWidth(); int h = srcImage.getHeight(); // 如果缩放后的图像和要求的图像宽度一样，就对缩放的图像的高度进行截取 if (w == width) { // 计算X轴坐标 int x = 0; int y = h / 2 - hight / 2; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } // 否则如果是缩放后的图像的高度和要求的图像高度一样，就对缩放后的图像的宽度进行截取 else if (h == hight) { // 计算X轴坐标 int x = w / 2 - width / 2; int y = 0; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } return true; } /** * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false * @param in 图片输入流 * @param saveFile 压缩后的图片输出流 * @param proportion 压缩比 * @throws Exception */ public static boolean compress(InputStream in, File saveFile, int proportion) { if(null == in ||null == saveFile ||proportion < 1){// 检查参数有效性 //LoggerUtil.error(ImageHelper.class, "--invalid parameter, do nothing!"); return false; } BufferedImage srcImage = null; try { srcImage = ImageIO.read(in); } catch (IOException e) { e.printStackTrace(); return false; } // 原图的大小 int width = srcImage.getWidth() / proportion; int hight = srcImage.getHeight() / proportion; srcImage = resize(srcImage, width, hight); // 缩放后的图像的宽和高 int w = srcImage.getWidth(); int h = srcImage.getHeight(); // 如果缩放后的图像和要求的图像宽度一样，就对缩放的图像的高度进行截取 if (w == width) { // 计算X轴坐标 int x = 0; int y = h / 2 - hight / 2; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } // 否则如果是缩放后的图像的高度和要求的图像高度一样，就对缩放后的图像的宽度进行截取 else if (h == hight) { // 计算X轴坐标 int x = w / 2 - width / 2; int y = 0; try { saveSubImage(srcImage, new Rectangle(x, y, width, hight), saveFile); } catch (IOException e) { e.printStackTrace(); return false; } } return true; } /** * 实现缩放后的截图 * @param image 缩放后的图像 * @param subImageBounds 要截取的子图的范围 * @param subImageFile 要保存的文件 * @throws IOException */ private static void saveSubImage(BufferedImage image, Rectangle subImageBounds, File subImageFile) throws IOException { if (subImageBounds.x < 0 || subImageBounds.y < 0 || subImageBounds.width - subImageBounds.x > image.getWidth() || subImageBounds.height - subImageBounds.y > image.getHeight()) { //LoggerUtil.error(ImageHelper.class, "Bad subimage bounds"); return; } BufferedImage subImage = image.getSubimage(subImageBounds.x,subImageBounds.y, subImageBounds.width, subImageBounds.height); String fileName = subImageFile.getName(); String formatName = fileName.substring(fileName.lastIndexOf('.') + 1); ImageIO.write(subImage, formatName, subImageFile); } public static void main(String[] args) throws Exception { /** * saveSubImage 截图类的使用 * srcImage 为BufferedImage对象 * Rectangle 为需要截图的长方形坐标 * saveFile 需要保存的路径及名称 * **/ //需要截图的长方形坐标 /*Rectangle rect =new Rectangle(); rect.x=40; rect.y=40; rect.height=160; rect.width=160; InputStream in = null; //需要保存的路径及名称 File saveFile = new File("d:\\ioc\\files\\aaa2.jpg"); //需要进行处理的图片的路径 in = new FileInputStream(new File("d:\\ioc\\files\\aaa.jpg")); BufferedImage srcImage = null; //将输入的数据转为BufferedImage对象 srcImage = ImageIO.read(in); ImageHelper img=new ImageHelper(); img.saveSubImage(srcImage, rect, saveFile);*/ /** * compress 图片缩放类的使用(缩略图) * srcImage 为InputStream对象 * Rectangle 为需要截图的长方形坐标 * proportion 为压缩比例 * **/ InputStream in = null; //缩放后需要保存的路径 File saveFile = new File("d:\\ABC.jpg"); try { //原图片的路径 in = new FileInputStream(new File("d:\\download.jpg")); if(compress(in, saveFile, 5)){ System.out.println("图片压缩5倍！"); } } catch (Exception e) { e.printStackTrace(); } finally { in.close(); } } } 参考: https://blog.csdn.net/abubu123/article/details/77099950