博客 - 本地图片合成

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.net.URL;

import javax.imageio.ImageIO;

import org.springframework.stereotype.Component;

​

@Component

public class ImageHandleUtil {

  private Font font = null;

  private Graphics2D g = null;

​

  /**

   * 导入本地图片到缓冲区

   * 

   * @param imgName

   * @return

   */

  public BufferedImage loadImageLocal(String imgName) {

    try {

      return ImageIO.read(new File(imgName));

    } catch (IOException e) {

      e.printStackTrace();

    }

    return null;

  }

​

  /**

   * 导入网络图片到缓冲区

   * 

   * @param imgName

   * @return

   */

  public BufferedImage loadImageUrl(String imgName) {

    try {

      URL url = new URL(imgName);

      return ImageIO.read(url);

    } catch (IOException e) {

      e.printStackTrace();

    }

    return null;

  }

​

  /**

   * 生成新图片到本地

   * 

   * @param newImage

   * @param img

   */

  public void writeImageLocal(String newImage, BufferedImage img) {

    if (newImage != null && img != null) {

      try {

        // 目录不存在则创建

        String dirUrl = newImage.substring(0, newImage.lastIndexOf(File.separator));

        File dir = new File(dirUrl);

        if (!dir.exists()) {

          dir.mkdirs();

        }

        File outputfile = new File(newImage);

        ImageIO.write(img, "png", outputfile);

      } catch (IOException e) {

        e.printStackTrace();

      }

    }

  }

​

  /**

   * 设定文字的字体等

   * 

   * @param fontStyle

   * @param fontSize

   */

  public void setFont(String name, int style, int fontSize) {

    this.font = new Font(name, style, fontSize);

  }

​

  /**

   * 修改图片,返回修改后的图片缓冲区（只输出一行文本）,图片居中显示

   * 

   * @param img

   * @param content

   * @param y

   * @param color

   * @return

   */

  public BufferedImage modifyImage(BufferedImage img, Object content, int y, Color color) {

    try {

      g = img.createGraphics();

      g.setBackground(Color.WHITE);

      g.setColor(color);// 设置字体颜色

      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 抗锯齿

      if (this.font != null)

        g.setFont(this.font);

      int width = img.getWidth();// 图片宽度

      if (content != null) {

        String str = content.toString();

        int strWidth = g.getFontMetrics().stringWidth(str);// 字体宽度

        g.drawString(str, (width - strWidth) / 2, y);

      }

      g.dispose();

    } catch (Exception e) {

      e.printStackTrace();

    }

    return img;

  }

​

  public BufferedImage modifyImage(BufferedImage img, Object content, int x, int y, Color color) {

    try {

      g = img.createGraphics();

      g.setBackground(Color.WHITE);

      g.setColor(color);// 设置字体颜色

      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 抗锯齿

      if (this.font != null)

        g.setFont(this.font);

      if (content != null) {

        String str = content.toString();

        g.drawString(str, x, y);

      }

      g.dispose();

    } catch (Exception e) {

      e.printStackTrace();

    }

    return img;

  }

​

  /**

   * 将一张图片画在另一张图片上

   * 

   * @param addImage 被添加的图片

   * @param sourceImg 源图

   * @param x

   * @param y

   * @param width

   * @param height

   * @return

   */

  public BufferedImage modifyImagetogeter(BufferedImage addImage, BufferedImage sourceImg, int x,

      int y) {

    int width = addImage.getWidth();

    int height = addImage.getHeight();

    try {

      g = sourceImg.createGraphics();

      g.drawImage(addImage, x, y, width, height, null);

      g.dispose();

    } catch (Exception e) {

      e.printStackTrace();

    }

    return sourceImg;

  }

  /**

   * 

   * @param img1 

   * @param img2

   * @param title 标题

   * @param reservePrice 现价

   * @param zkFinalPrice 折扣价

   * @return BufferedImage

   * @throws IOException

   */

  public BufferedImage mergeImage(BufferedImage img1, BufferedImage img2,String title,String reservePrice,String zkFinalPrice)

      throws IOException {

    Font font = new Font("微软雅黑", Font.BOLD, 20);

    int w1 = img1.getWidth();

    int h1 = img1.getHeight();

    int w2 = img2.getWidth();

    int h2 = img2.getHeight();

    BufferedImage newImage = new BufferedImage(w1, h2 + h1 + h2/2, BufferedImage.TYPE_INT_RGB);// 新的图

    Graphics2D graphics = (Graphics2D) newImage.getGraphics();

    graphics.setBackground(Color.WHITE);

    graphics.fillRect(0, 0, newImage.getWidth(), newImage.getHeight());

    graphics.drawImage(img1, 0, 0, null);

    graphics.drawImage(img2, (newImage.getWidth()) / 2 - (w2 / 2), newImage.getHeight() - h2,

        null);

    graphics.setFont(font);

    graphics.setColor(Color.BLACK);

    int width = graphics.getFontMetrics(font).stringWidth(title);

    int startY = h1 + 30;

    if (width > newImage.getWidth()) {

      char[] array = title.toCharArray();

      StringBuilder sb = new StringBuilder(array[0]);

      for (char c : array) {

        sb.append(c);

        int newWidth = graphics.getFontMetrics(font).stringWidth(sb.toString());

        if ((newWidth + 19) >= newImage.getWidth()) {// 准备换行

          graphics.drawString(sb.toString(), 0, startY);

          startY += 30;

          sb.delete(0, sb.length());

        }

      }

      graphics.drawString(sb.toString(), 0, startY);

    } else {

      graphics.drawString(title, 0, startY);

    }

    graphics.drawString("现价￥"+reservePrice, 0, startY + 30);

    startY += 30;

    graphics.drawString("卷后价￥"+zkFinalPrice, 0, startY + 30);

    return newImage;

  }

}