最近抖音上挺火的一个小把戏，在记事本打开，一整篇的乱码字符，然后进过调整之后，出现一张由各种字符组成的黑白照片。先看一个效果图

微信小程序体验

 直接体验请微信扫码

选择图片转字符图片

 接下来我们就用Java来实现吧。

需要用到的工具类代码

https://gitee.com/xshuai/ai/blob/master/AIDemo/src/main/java/com/xs/util/image/AnimatedGifEncoder.java

https://gitee.com/xshuai/ai/blob/master/AIDemo/src/main/java/com/xs/util/image/LZWEncoder.java

https://gitee.com/xshuai/ai/blob/master/AIDemo/src/main/java/com/xs/util/image/NeuQuant.java

单独的项目地址

https://gitee.com/xshuai/imagetool

本项目使用的公式为: Gray = R*0.299 + G*0.587 + B*0.114

更多RGB色转灰度可以访问:https://blog.csdn.net/xdrt81y/article/details/8289963

非闪图图片转字符画到记事本

package com.xs.util.image;import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;import javax.imageio.ImageIO;import com.xs.util.image.other.ImageHelper;
/*** Image2ASCII* @author 小帅丶* 2018年8月14日*/
public class Image2ASCII{static String ascii = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\\|()1{}[]?-_+~<>i!lI;:,\\\"^`'.";static String base = "@#&$%*o!;.";//小帅丶使用这个字符//main方法调用public static void main(String[] args) throws Exception {load("G:/phone.jpg", "F:/gif/woman.txt");//静态图片转字符保存为txt文件}/*** 图片转字符* @param imagePath 图片路径 * @param txtPath 文本存放路径* @throws IOException*/public static void load(String imagePath, String txtPath)throws IOException {BufferedImage image = ImageHelper.resize(ImageIO.read(new File(imagePath)),150,150);load(image, txtPath);}/*** 图片转字符* @param bi BufferedImage图片 * @param txtPath 文本存放路径* @throws IOException*/public static void load(BufferedImage bi, String txtPath)throws IOException {try {int width = bi.getWidth();int height = bi.getHeight();boolean flag = false;String result = "";for (int i = 0; i < height; i += 2) {for (int j = 0; j < width; j++) {int pixel = bi.getRGB(j, i); // 下面三行代码将一个数字转换为RGB数字int red = (pixel & 0xff0000) >> 16;int green = (pixel & 0xff00) >> 8;int blue = (pixel & 0xff);float gray = 0.299f * red + 0.578f * green + 0.114f * blue;int index = Math.round(gray * (base.length() + 1) / 255);result += index >= base.length() ? " " : String.valueOf(base.charAt(index));}result += "\r\n";}flag = writeTxtFile(result,txtPath);//保存字符到文本文件System.out.println(flag?"图片转字符保存成功":"图片转字符保存失败");} catch (Exception e) {System.out.println("图片转字符异常"+e.getMessage());}}/*** 字符保存到txt文件中 * @param imageStr 字符* @param txtPath  txt文件* @return boolean* @throws Exception*/private static boolean writeTxtFile(String imageStr, String txtPath) throws Exception{// 先读取原有文件内容，然后进行写入操作boolean flag = false;String filein = imageStr;String temp = "";FileInputStream fis = null;InputStreamReader isr = null;BufferedReader br = null;FileOutputStream fos = null;PrintWriter pw = null;try {// 文件路径File file = new File(txtPath);if (!file.exists()) {file.createNewFile();}// 将文件读入输入流fis = new FileInputStream(file);isr = new InputStreamReader(fis);br = new BufferedReader(isr);StringBuffer buf = new StringBuffer();// 保存该文件原有的内容for (int j = 1; (temp = br.readLine()) != null; j++) {buf = buf.append(temp);}buf.append(filein);fos = new FileOutputStream(file);pw = new PrintWriter(fos);pw.write(buf.toString().toCharArray());pw.flush();flag = true;} catch (IOException e) {System.out.println("文件保存失败"+e.getMessage());} finally {if (pw != null) {pw.close();}if (fos != null) {fos.close();}if (br != null) {br.close();}if (isr != null) {isr.close();}if (fis != null) {fis.close();}}return flag;}
}

非闪图图片转字符画返回BASE64

直接保存为图片也可以。

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;import javax.imageio.ImageIO;import sun.misc.BASE64Encoder;/*** Image2ASCII* @author 小帅丶* 2018年8月14日*/
public class Image2ASCII{static String ascii = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\\|()1{}[]?-_+~<>i!lI;:,\\\"^`'.";static String base = "@#&$%*o!;.";//小帅丶使用这个字符/** 图片类型  */private static final int IMAGE_TYPE = BufferedImage.TYPE_INT_RGB;/*** 图片转字符再保存为图片 只返回图片的base64* @param bi 原图* @param outPutPath* @return String*/public static String txtToImageByBase64(BufferedImage bi) {System.out.println("进来的时间"+System.currentTimeMillis());int width = bi.getWidth();int height = bi.getHeight();int minx = bi.getMinX();int miny = bi.getMinY();int speed = 7;BufferedImage bufferedImage = new BufferedImage(width,height,IMAGE_TYPE);// 获取图像上下文Graphics g = createGraphics(bufferedImage, width, height, speed);// 图片中文本行高final int Y_LINEHEIGHT = speed;int lineNum = 1;for (int i = miny; i < height; i += speed) {for (int j = minx; j < width; j += speed) {int pixel = bi.getRGB(j, i); // 下面三行代码将一个数字转换为RGB数字int red = (pixel & 0xff0000) >> 16;int green = (pixel & 0xff00) >> 8;int blue = (pixel & 0xff);float gray = 0.299f * red + 0.578f * green + 0.114f * blue;int index = Math.round(gray * (base.length() + 1) / 255);String c = index >= base.length() ? " " : String.valueOf(base.charAt(index));g.drawString(String.valueOf(c), j, i);}lineNum++;}g.dispose();ByteArrayOutputStream out = new ByteArrayOutputStream();try {ImageIO.write(bufferedImage,"jpg",out);BASE64Encoder base64Encoder = new BASE64Encoder();String base64 =base64Encoder.encode(out.toByteArray());return base64;} catch (IOException e) {System.out.println("ImageIO.write异常" + e.getMessage());}finally{if(null!=out){try {out.close();} catch (IOException e) {System.out.println("out.close()异常" + e.getMessage());}}}return null;}/*** 画板默认一些参数设置* @param image 图片* @param width 图片宽* @param height 图片高* @param size 字体大小* @return*/private static Graphics createGraphics(BufferedImage image, int width,int height, int size) {Graphics g = image.createGraphics();g.setColor(null); // 设置背景色g.fillRect(0, 0, width, height);// 绘制背景g.setColor(Color.BLACK); // 设置前景色g.setFont(new Font("微软雅黑", Font.PLAIN, size)); // 设置字体return g;}
}

效果图

方法返回的为图片的base64数据。格式为jpg。加头信息即可在img标签的src中显示图片哦。

在线转base64为图片 需要加头信息 data:image/jpg;base64,

http://imgbase64.duoshitong.com/

闪图图片转字符画返回图片

package com.xs.util.image;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.FileImageInputStream;import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.imageio.plugins.gif.GIFImageReader;
import com.sun.imageio.plugins.gif.GIFImageReaderSpi;import sun.misc.BASE64Encoder;/*** Image2ASCII* @author 小帅丶* 2018年8月14日*/
public class Image2ASCII{static String ascii = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\\|()1{}[]?-_+~<>i!lI;:,\\\"^`'.";static String base = "@#&$%*o!;.";//小帅丶使用这个字符/** 图片类型  */private static final int IMAGE_TYPE = BufferedImage.TYPE_INT_RGB;/*** gif图片转gif字符图* @param imagePath 原图路径* @param outPath  输出图片的文件夹路径* @throws IOException*/public static void loadGif(String imagePath, String outPath)throws IOException {File imageFile = new File(imagePath);FileImageInputStream in = new FileImageInputStream(imageFile);ImageReaderSpi readerSpi = new GIFImageReaderSpi();GIFImageReader gifImageReader = new GIFImageReader(readerSpi);gifImageReader.setInput(in);int num = gifImageReader.getNumImages(true);System.out.println(num);BufferedImage[] bufferedImages = new BufferedImage[num];for (int i = 0; i < num; i++) {BufferedImage bi = gifImageReader.read(i);bufferedImages[i] = txtToImage(bi, outPath + "out" + i + ".jpeg"); //每一帧都保存为图片}jpgToGif(bufferedImages,outPath + imagePath.substring(imagePath.length() - 6)+ "outGif.gif", 200);}/*** 图片转字符再保存为图片* @param bi 原图* @param outPutPath* @return BufferedImage*/public static BufferedImage txtToImage(BufferedImage bi, String outPutPath) {File imageFile = new File(outPutPath);if (!imageFile.exists()) {try {imageFile.createNewFile();} catch (IOException e) {e.printStackTrace();}}int width = bi.getWidth();int height = bi.getHeight();int minx = bi.getMinX();int miny = bi.getMinY();System.out.println(width + " " + height);int speed = 7;BufferedImage bufferedImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);// 获取图像上下文Graphics g = createGraphics(bufferedImage, width, height, speed);// 图片中文本行高final int Y_LINEHEIGHT = speed;int lineNum = 1;for (int i = miny; i < height; i += speed) {for (int j = minx; j < width; j += speed) {int pixel = bi.getRGB(j, i); // 下面三行代码将一个数字转换为RGB数字int red = (pixel & 0xff0000) >> 16;int green = (pixel & 0xff00) >> 8;int blue = (pixel & 0xff);float gray = 0.299f * red + 0.578f * green + 0.114f * blue;int index = Math.round(gray * (base.length() + 1) / 255);
//              char c = ascii.charAt((int) (gray / 255 * ascii.length()));
//              char c = toChar((int) gray);
//              char c = toChar(index);String c = index >= base.length() ? " " : String.valueOf(base.charAt(index));g.drawString(String.valueOf(c), j, i);}lineNum++;}g.dispose();// 保存为jpg图片FileOutputStream fos;try {fos = new FileOutputStream(imageFile);JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);OutputStream out = encoder.getOutputStream();BASE64Encoder base64Encoder = new BASE64Encoder();encoder.encode(bufferedImage);fos.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (ImageFormatException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return bufferedImage;}/*** 画板默认一些参数设置* @param image 图片* @param width 图片宽* @param height 图片高* @param size 字体大小* @return*/private static Graphics createGraphics(BufferedImage image, int width,int height, int size) {Graphics g = image.createGraphics();g.setColor(null); // 设置背景色g.fillRect(0, 0, width, height);// 绘制背景g.setColor(Color.BLACK); // 设置前景色g.setFont(new Font("微软雅黑", Font.PLAIN, size)); // 设置字体return g;}/*** n张jpg转gif方法  * @param bufferedImages* @param newPic* @param playTime*/private static void jpgToGif(BufferedImage[] bufferedImages, String newPic,int playTime) {try {AnimatedGifEncoder e = new AnimatedGifEncoder();e.setRepeat(0);e.start(newPic);for (int i = 0; i < bufferedImages.length; i++) {e.setDelay(playTime); // 设置播放的延迟时间e.addFrame(bufferedImages[i]); // 添加到帧中}e.finish();} catch (Exception e) {System.out.println("jpgToGif Failed:");}}
}

调用代码

public static void main(String[] args) throws Exception {loadGif("C:/Users/Administrator/Desktop/页面录屏显示.gif", "F:/gif/");//动图转为动态的字符图片}

返回的图片效果原图为小程序演示闪图