java 生成文字图片

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

public class FontImage {
	public static void main(String[] args) throws Exception {
		createImage("请A1003到3号窗口", new Font("宋体", Font.BOLD, 30), new File(
				"e:/a.png"), 4096, 64);
		createImage("请A1002到2号窗口", new Font("黑体", Font.BOLD, 35), new File(
				"e:/a1.png"), 4096, 64);
		createImage("请A1001到1号窗口", new Font("黑体", Font.PLAIN, 40), new File(
				"e:/a2.png"), 4096, 64);
	}

	// 根据str,font的样式以及输出文件目录
	public static void createImage(String str, Font font, File outFile,
			Integer width, Integer height) throws Exception {
		// 创建图片
		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_BGR);
		Graphics g = image.getGraphics();
		g.setClip(0, 0, width, height);
		g.setColor(Color.black);
		g.fillRect(0, 0, width, height);// 先用黑色填充整张图片,也就是背景
		g.setColor(Color.red);// 在换成黑色
		g.setFont(font);// 设置画笔字体
		/** 用于获得垂直居中y */
		Rectangle clip = g.getClipBounds();
		FontMetrics fm = g.getFontMetrics(font);
		int ascent = fm.getAscent();
		int descent = fm.getDescent();
		int y = (clip.height - (ascent + descent)) / 2 + ascent;
		for (int i = 0; i < 6; i++) {// 256 340 0 680
			g.drawString(str, i * 680, y);// 画出字符串
		}
		g.dispose();
		ImageIO.write(image, "png", outFile);// 输出png图片
	}
}