java 生成文字图片的示例代码

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   } }