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 
  } 
}