java如何生成imagecode？？？？？

package image;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.Random;

import javax.imageio.ImageIO;

public class ImageCode {

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

generateImageCode();

}

public static void generateImageCode() throws IOException {

System.out.println("generating image code...");

int height = 22;

int width = 68;

// 1.創建圖片緩存區

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

// 2.創建繪制環境

Graphics paint = image.getGraphics();

Color c = new Color(200, 150, 255);

// 設置畫筆

paint.setColor(c);

// 畫背景

paint.fillRect(0, 0, width, height);

// 繪制數字和字母

StringBuffer codes = new StringBuffer();

char[] ch = "QWERTYUIOPASDFGHJKLZXCVBNM1234567890".toCharArray();

Random r = new Random();

int index;

for(int i = 0; i < 4; i++) {

index = r.nextInt(ch.length);

// 設置文本顏色

paint.setColor(new Color(r.nextInt(88), r.nextInt(150), r.nextInt(255)));

paint.drawString(ch[index]+"", (i*16)+3, 18);

codes.append(ch[index]);

}

File file = new File("./out.jpg");

ImageIO.write(image, "JPG", file);

System.out.println("generate image code successfully");

}

}

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