JAVA 自定义文字生成图片

package struts;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.imageio.ImageIO;
import sun.swing.SwingUtilities2;

public class WordToPic {

	//
	public static int getLength(String text) {
		int length = 0;
		for (int i = 0; i < text.length(); i++) {
			if (new String(text.charAt(i) + "").getBytes().length > 1) {
				length += 2;
			} else {
				length += 1;
			}
		}
		return length / 2;
	}

	public static String TextToPic(String text, int width, int height,int fontSize) {
		try {
			String filepath = "D://" + getDate() + ".png";
			File file = new File(filepath);
			System.out.println("topic=" + text);
			Font font = new Font("微软雅黑", Font.BOLD, fontSize);
			BufferedImage bi = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
			Graphics2D g2 = (Graphics2D) bi.getGraphics();
			g2.setBackground(null);
			g2.clearRect(0, 0, width, height);
			g2.setFont(font);
			g2.setPaint(Color.BLACK);
			g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,0.3f));
			g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
			printString(g2, text, (width - (text.length() * fontSize)) / 2 + 0,(height - fontSize) / 2 + 40, fontSize);
			g2.dispose();
			ImageIO.write(bi, "png", file);
			return "image" + getDate() + ".png";

		} catch (Exception e) {
			e.printStackTrace();
		}
		return "";
	}

	private static void printString(Graphics2D g2d, String str, int x, int y,int fontSize) {
		FontMetrics metrics = SwingUtilities2.getFontMetrics(null,g2d.getFont());
		for (char ca : str.toCharArray()) {
			int px = metrics.stringWidth("" + ca);
			g2d.drawString("" + ca, x + (fontSize - px) / 2, y);
			x += fontSize;
		}
	}

	public static String getDate() {
		SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
		return formatter.format(new Date());
	}

	public static void main(String[] args) throws IOException {
		TextToPic("中文生成图片", 500, 100, 50);
	}

}