java文字转换成图片输出

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("请在这里输入文字", new Font("微软雅黑", Font.PLAIN, 32), new File("d:/a.png"), 500, 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.white);
g.fillRect(0, 0, width, height);// 先用黑色填充整张图片,也就是背景
g.setColor(Color.black);// 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
}
}