java生成图片

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class PictureGenerator {
 private void generate() {
  int width = 100;
  int height = 100;
  String s = "你好";
  File file = new File("C:/image.gif");
  Font font = new Font("Serif", Font.BOLD, 10);
  // 创建一个画布
  BufferedImage bi = new BufferedImage(width, height,
    BufferedImage.TYPE_INT_RGB);
  // 获取画布的画笔
  Graphics2D g2 = (Graphics2D) bi.getGraphics();
  // 开始绘图
  g2.setBackground(Color.WHITE);
  g2.clearRect(0, 0, width, height);
  g2.setPaint(new Color(0, 0, 255));
  g2.fillRect(0, 0, 100, 10);
  g2.setPaint(new Color(253, 2, 0));
  g2.fillRect(0, 10, 100, 10);
  g2.setPaint(Color.red);
  FontRenderContext context = g2.getFontRenderContext();
  Rectangle2D bounds = font.getStringBounds(s, context);
  double x = (width - bounds.getWidth()) / 2;
  double y = (height - bounds.getHeight()) / 2;
  double ascent = -bounds.getY();
  double baseY = y + ascent;
  // 绘制字符串
  g2.drawString(s, (int) x, (int) baseY);
  try {
   // 将生成的图片保存为jpg格式的文件。ImageIO支持jpg、png、gif等格式
   ImageIO.write(bi, "gif", file);
  } catch (IOException e) {
   System.out.println("生成图片出错........");
   e.printStackTrace();
  }
 }

 public static void main(String[] args) {
  PictureGenerator mg = new PictureGenerator();
  mg.generate();
 }
}