QingLong/src/main/java/UnitTest/WriteCharactorToPng.java

package UnitTest;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class WriteCharactorToPng {
    public static void main(String[] args) throws IOException {
        String pngPath = "D:\\dsWork\\QingLong\\src\\main\\java\\UnitTest\\Image\\Rectangle.png";
        BufferedImage image = ImageIO.read(new File(pngPath));
        Graphics2D g = image.createGraphics();
        g.setColor(Color.BLACK);
        g.setFont(new Font("黑体", Font.PLAIN, 28));

        String text = "三角形";
        FontMetrics fm = g.getFontMetrics();
        int x = (image.getWidth() - fm.stringWidth(text)) / 2;
        int y = (image.getHeight() - fm.getHeight()) / 2 + fm.getAscent();
        g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g.drawString(text, x, y);
        g.dispose();

        ImageIO.write(image, "PNG", new File("c:\\output.png"));
    }
}