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[Java教程]java实现仿微信群组合头像


package com.zovon.util;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.List;import javax.imageio.ImageIO;/** * 该类是图片处理类 * * @author 王永丰 * */public final class ImageUtil {  /** 图片格式:JPG */  private static final String PICTRUE_FORMATE_JPG = "jpg";  private ImageUtil() {  }/**   * 生成组合头像   *   * @param paths   *      用户图像   * @throws IOException   */  public static void getCombinationOfhead(List<String> paths)      throws IOException {    List<BufferedImage> bufferedImages = new ArrayList<BufferedImage>();    // 压缩图片所有的图片生成尺寸同意的 为 50x50    for (int i = 0; i < paths.size(); i++) {      bufferedImages.add(ImageUtil.resize2(paths.get(i), 50, 50, true));    }    int width = 112; // 这是画板的宽高    int height = 112; // 这是画板的高度    // BufferedImage.TYPE_INT_RGB可以自己定义可查看API    BufferedImage outImage = new BufferedImage(width, height,        BufferedImage.TYPE_INT_RGB);    // 生成画布    Graphics g = outImage.getGraphics();        Graphics2D g2d = (Graphics2D) g;        // 设置背景色    g2d.setBackground(new Color(231,231,231));        // 通过使用当前绘图表面的背景色进行填充来清除指定的矩形。    g2d.clearRect(0, 0, width, height);        // 开始拼凑 根据图片的数量判断该生成那种样式的组合头像目前为4中    int j = 1;    for (int i = 1; i <= bufferedImages.size(); i++) {      if (bufferedImages.size() == 4) {        if (i <= 2) {          g2d.drawImage(bufferedImages.get(i - 1), 50 * i + 4 * i              - 50, 4, null);        } else {          g2d.drawImage(bufferedImages.get(i - 1), 50 * j + 4 * j              - 50, 58, null);          j++;        }      } else if (bufferedImages.size() == 3) {        if (i <= 1) {          g2d.drawImage(bufferedImages.get(i - 1), 31, 4, null);        } else {          g2d.drawImage(bufferedImages.get(i - 1), 50 * j + 4 * j              - 50, 58, null);          j++;        }      } else if (bufferedImages.size() == 2) {        g2d.drawImage(bufferedImages.get(i - 1), 50 * i + 4 * i - 50,            31, null);      } else if (bufferedImages.size() == 1) {        g2d.drawImage(bufferedImages.get(i - 1), 31, 31, null);      }      // 需要改变颜色的话在这里绘上颜色。可能会用到AlphaComposite类    }    String outPath = "E:\\b.jpg";    String format = "JPG";    ImageIO.write(outImage, format, new File(outPath));  }  /**   * 图片缩放   *   * @param filePath   *      图片路径   * @param height   *      高度   * @param width   *      宽度   * @param bb   *      比例不对时是否需要补白   */  public static BufferedImage resize2(String filePath, int height, int width,      boolean bb) {    try {      double ratio = 0; // 缩放比例      File f = new File(filePath);      BufferedImage bi = ImageIO.read(f);      Image itemp = bi.getScaledInstance(width, height,          Image.SCALE_SMOOTH);      // 计算比例      if ((bi.getHeight() > height) || (bi.getWidth() > width)) {        if (bi.getHeight() > bi.getWidth()) {          ratio = (new Integer(height)).doubleValue()              / bi.getHeight();        } else {          ratio = (new Integer(width)).doubleValue() / bi.getWidth();        }        AffineTransformOp op = new AffineTransformOp(            AffineTransform.getScaleInstance(ratio, ratio), null);        itemp = op.filter(bi, null);      }      if (bb) {        // copyimg(filePath, "D:\\img");        BufferedImage image = new BufferedImage(width, height,            BufferedImage.TYPE_INT_RGB);        Graphics2D g = image.createGraphics();        g.setColor(Color.white);        g.fillRect(0, 0, width, height);        if (width == itemp.getWidth(null))          g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2,              itemp.getWidth(null), itemp.getHeight(null),              Color.white, null);        else          g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0,              itemp.getWidth(null), itemp.getHeight(null),              Color.white, null);        g.dispose();        itemp = image;      }      return (BufferedImage) itemp;    } catch (IOException e) {      e.printStackTrace();    }    return null;  }}