验证码

package com.haier.cosmoplat.portal.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;

/**
 * 验证码生成类
 */
public class RandomImageGenerator {
	
	// 创建Random对象
	static Random random = new Random();

	// 随机生成包含验证码字符串
	public static String random(int num) {
		// 初始化种子
		String[] str = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i",
				"j", "k", "l", "m", "n", "p", "q", "r", "s", "t" };
		int number = str.length;
		// 接收随机字符
		String text = "";
		// 随机产生4个字符的字符串
		for (int i = 0; i < num; i++) {
			text += str[random.nextInt(number)];
		}
		return text;
	}

	/**
	 * 随机产生定义的颜色
	 * @return
	 */
	private static Color getRandColor() {
		Random random = new Random();
		Color color[] = new Color[10];
		color[0] = new Color(32, 158, 25);
		color[1] = new Color(218, 42, 19);
		color[2] = new Color(31, 75, 208);
		color[3] = new Color(0, 102, 182);
		color[4] = new Color(171, 0, 85);
		return color[random.nextInt(5)];
	}

	/**
	 * 产生随机字体
	 * @return
	 */
	private static Font getFont() {
		Random random = new Random();
		Font font[] = new Font[5];
		font[0] = new Font("Ravie", Font.BOLD, 30);
		font[1] = new Font("Antique Olive Compact", Font.BOLD, 30);
		font[2] = new Font("Forte", Font.BOLD, 30);
		font[3] = new Font("Wide Latin", Font.BOLD, 30);
		font[4] = new Font("Gill Sans Ultra Bold", Font.BOLD, 30);
		return font[random.nextInt(5)];
	}

	/**
	 * 生成图片
	 * @throws IOException
	 */
	public static void render(String randomStr, OutputStream out, int width, int height) throws IOException {
		// 在内存中创建图像
		BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_INDEXED);
		// 获取图形上下文
		Graphics2D g = (Graphics2D) bi.getGraphics();
		// 话边框
		g.setColor(Color.white);
		g.fillRect(0, 0, width, height);
		g.setFont(getFont());
		g.setColor(Color.BLACK);
		// 画认证码，每个认证码在不同的水平位置
		String str1[] = new String[randomStr.length()];
		for (int i = 0; i < str1.length; i++) {
			str1[i] = randomStr.substring(i, i + 1);
			int w = 0;
			int x = (i + 1) % 3;
			// 随机生成验证码字符水平偏移量
			if (x == random.nextInt(7)) {
				w = 30 - random.nextInt(7);
			} else {
				w = 30 + random.nextInt(7);
			}
			// 随机生成颜色
			g.setColor(getRandColor());
			g.drawString(str1[i], 20 * i + 10, w);
		}
		// 随机产生干扰点，并用不同的颜色表示，事图像的认证码不易被其他程序探测到
		for (int i = 0; i < 100; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			Color color = new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));
			// 随机画各种颜色的线
			g.setColor(color);
			g.drawOval(x, y, 0, 0);
		}
		// 画干扰线
		for (int i = 0; i < 15; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int x1 = random.nextInt(width);
			int y1 = random.nextInt(height);
			Color color = new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));
			// 随机画各种颜色线
			g.setColor(color);
			g.drawLine(x, y, x1, y1);
		}
		// 图像生效
		g.dispose();
		// 输出页面
		ImageIO.write(bi, "jpg", out);
	}

	public static void main(String[] args) throws FileNotFoundException, IOException {
		// 获取随机字符串
		String randomStr = random(5);
		System.out.println(randomStr);
		// 生成图片
		render(randomStr, new FileOutputStream("D:\\test.jpg"), 130, 40);
	}
}

 

 调用方法：

@ApiOperation("code")
@RequestMapping(value = "/code", method = RequestMethod.GET)
public void code(HttpServletResponse response, String randomStr) throws FileNotFoundException, IOException {
	// String randomStr = RandomImageGenerator.random(4);//生成4位随机数
        //randomStr 验证码
        //110：宽度，40：高度
	RandomImageGenerator.render(randomStr, response.getOutputStream(), 110, 40);
}