How to generate an image and add text in Java?

To generate images and add text, you can utilize Java’s graphic processing libraries like Java AWT (Abstract Window Toolkit) or Java Graphics2D.

Here is a simple example code demonstrating how to generate an image and add text in Java.

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class ImageGenerator {

    public static void main(String[] args) {
        int width = 300;
        int height = 200;

        // 创建一个 BufferedImage 对象，宽度为 width，高度为 height，使用 RGB 颜色模式
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        // 获取 Graphics2D 对象，用于绘制图形
        Graphics2D g2d = image.createGraphics();

        // 设置背景颜色为白色
        g2d.setColor(Color.WHITE);
        g2d.fillRect(0, 0, width, height);

        // 设置字体样式和大小
        Font font = new Font("Arial", Font.BOLD, 20);
        g2d.setFont(font);

        // 设置文字颜色为黑色
        g2d.setColor(Color.BLACK);

        // 在图片上绘制文字
        String text = "Hello, World!";
        int textWidth = g2d.getFontMetrics().stringWidth(text);
        int x = (width - textWidth) / 2;
        int y = height / 2;
        g2d.drawString(text, x, y);

        // 释放资源
        g2d.dispose();

        // 保存生成的图片
        try {
            File output = new File("output.png");
            ImageIO.write(image, "png", output);
            System.out.println("图片已生成！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

The code above will create an image with a white background, a width of 300 and a height of 200, with the text “Hello, World!” drawn in the middle. The resulting image will be saved as a file named “output.png”.

Please make sure you have installed the Java development environment and save the above code as a file named “ImageGenerator.java”. To run the Java program, you can compile the source code using the command javac ImageGenerator.java, and then run the program using the command java ImageGenerator. The generated image will be saved in the current directory.

You can adjust the size, background color, font style and size, as well as the content and position of the text to meet your needs.