100 行 Java 代码实现一个表情包生成器！

package cn.lulei.util.img;   import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.util.ArrayList; import javax.imageio.ImageIO; import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import com.sun.image.codec.jpeg.JPEGImageEncoder;  public class ImgDeal {  private final static int FONTSIZE = 24;    /**   * @param filePath   * @param outStream   * @param characters   * @param heights   * @param c   * @throws IOException   * @Date: 2014-1-20     * @Author: lulei     * @Description: 绘制图片   */  public static void drawImg(String filePath, OutputStream outStream, ArrayList<String> characters, ArrayList<Integer> heights, Color c) throws IOException {    //参数不对，直接返回    if(characters == null || heights == null || characters.size() != heights.size()){      return;    }    File file = new File(filePath);    //文件不存在，直接返回    if (!file.exists()) {      return;    }    Image img = ImageIO.read(file);    int[] wh = getImgWH(img);    BufferedImage bufferedImage = new BufferedImage(wh[0], wh[1], BufferedImage.TYPE_INT_RGB);    Graphics2D g = bufferedImage.createGraphics();    g.drawImage(img.getScaledInstance(wh[0], wh[1], Image.SCALE_SMOOTH), 0, 0, null);    g.setColor(c);    int i = 0;    //图片上输入文字    for (String character : characters){      int[] fl = getFsLs(wh[0], getLength(character, 0));      g.setFont(new Font("楷体", Font.BOLD, fl[1]));      g.drawString(character, fl[0], heights.get(i++));    }    //将图片输入到输出流中    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outStream);    JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bufferedImage);    param.setQuality(1.0F, false);    encoder.setJPEGEncodeParam(param);    encoder.encode(bufferedImage);  }    /**   * @param question   * @param defaultInt   * @return   * @Date: 2014-1-20     * @Author: lulei     * @Description: 计算字符长度   */  private static int getLength(String question, int defaultInt){    int re = 0;    if (question != null){      int count = question.length();      for(int i = 0; i < count; i++) {        if (question.charAt(i) < 255) {          re += 5;        } else {          re += 9;        }      }    }    re /= 9;    return re == 0 ? defaultInt : re;  }    /**   * @param img   * @return   * @Date: 2014-1-20     * @Author: lulei     * @Description: 获取图片的长宽   */  private static int[] getImgWH(Image img){    int[] wh = new int[2];    wh[0] = img.getWidth(null);    wh[1] = img.getHeight(null);    return wh;  }    /**   * @param width   * @param length   * @return   * @Date: 2014-1-20     * @Author: lulei     * @Description: 计算生成文字的宽度的起始位置和字体大小   */  private static int[] getFsLs(int width, int length) {    int[] fl = new int[2];    if (length * FONTSIZE < width) {      fl[0] = (width - (length * FONTSIZE)) / 2;      fl[1] = FONTSIZE;    } else {      fl[0] = 5;      fl[1] = width / length - 1;    }    return fl;  }}