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执行成功后会在D盘根目录生成32313133353236313431303231363533e59b9ee7ad9431333332616433一张名为image的jpg格式的图片，图片上以红色Serif体写着“你好”两个字——

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.font.FontRenderContext;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import javax.imageio.ImageIO;

public class CreateImage {

public static void main(String[] args) throws Exception {

int width = 100;

int height = 100;

String s = "你好";

File file = new File("d:/image.jpg");

Font font = new Font("Serif", Font.BOLD, 10);

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics2D g2 = (Graphics2D)bi.getGraphics();

g2.setBackground(Color.WHITE);

g2.clearRect(0, 0, width, height);

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;

g2.drawString(s, (int)x, (int)baseY);

ImageIO.write(bi, "jpg", file);

}

}