imagerandom.java

来自「移动彩信管理平台」· Java 代码 · 共 128 行

package com.my7g.zj.mobile.mms.util;

import java.awt.*;
import java.awt.image.*;
import java.util.*;
import java.io.*;
import javax.imageio.*;

/**
 * @author csc
 *
 */
public class ImageRandom {

	/**
	 * 生成随即验证码图片
	 * 
	 * @param imageWidth
	 * @param imageHeight
	 * @param randNumber
	 * @param fontType
	 * @param fontSize
	 * @param x
	 * @param y
	 * @param out
	 */
	public void create(int imageWidth, int imageHeight, String randNumber,
			String fontType, int fontSize, int x, int y, OutputStream out) {
		BufferedImage image = getBufferedImage(imageWidth, imageHeight);
		generate(image, randNumber, fontType, fontSize, x, y, out);
	}

	public BufferedImage getBufferedImage(InputStream in) throws Exception {
		return ImageIO.read(in);
	}

	public String getrandomString() {

		Random random = new Random();
		int randomNum = random.nextInt(9999);
		String randStr = String.valueOf(randomNum);

		switch (randStr.length()) {
		case 1:
			randStr = "000" + randStr;
			break;
		case 2:
			randStr = "00" + randStr;
			break;
		case 3:
			randStr = "0" + randStr;
		default:
			randStr = randStr.substring(0, 4);
			break;
		}

		return randStr;

	}

	public Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	public BufferedImage getBufferedImage(int width, int height) {
		return new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	}

	public void generate(BufferedImage image, String randNumber,
			String fontType, int fontSize, int x, int y, OutputStream out) {

		try {

			int width = image.getWidth();
			int height = image.getHeight();

			// 获取图形上下文
			Graphics g = image.getGraphics();

			// 设定背景色
			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, height);

			// 设定字体
			g.setFont(new Font(fontType, Font.PLAIN, fontSize));

			// 画边框
			// g.setColor(new Color());
			// g.drawRect(0,0,width-1,height-1);

			// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
			g.setColor(getRandColor(160, 200));
			// 生成随机类
			Random random = new Random();
			for (int i = 0; i < 155; i++) {
				int x2 = random.nextInt(width);
				int y2 = random.nextInt(height);
				int x3 = random.nextInt(12);
				int y3 = random.nextInt(12);
				g.drawLine(x2, y2, x2 + x3, y2 + y3);
			}

			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));

			g.drawString(randNumber, x, y);

			// 图象生效
			g.dispose();

			// 输出图象到页面
			ImageIO.write((BufferedImage) image, "JPEG", out);
		} catch (Exception ex) {
			System.err.println("generate image error: " + ex);
		}

	}

}