Java生成图片验证码完整代码(仿QQ验证码,扭曲)

2015-07-16 14:24:00
admin
转贴 3693
摘要:功能包括:自定义图片尺寸和字符长度,随机背景颜色和字符颜色和随机字体,随机字符偏移角度,字符平滑边缘,干扰线,噪点,背景扭曲。

示例图片

Java生成图片验证码完整代码(仿QQ验证码,扭曲)Java生成图片验证码完整代码(仿QQ验证码,扭曲)Java生成图片验证码完整代码(仿QQ验证码,扭曲)Java生成图片验证码完整代码(仿QQ验证码,扭曲)

AuthImage类:

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * [说明/描述]
 * 
 * @author LBZ
 * @date 2015-7-15 下午5:27:22
 * @project 
 * @version v1.0
 * @see 相关类
 * @since 相关/版本
 */
public class AuthImage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
	private static final long serialVersionUID = 701381450842632429L;

	public void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		response.setContentType("image/jpeg");

		// 生成随机字串
		String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
		// 存入会话session
		HttpSession session = request.getSession(true);
		session.setAttribute("rand", verifyCode.toLowerCase());
		// 生成图片
		int w = 200, h = 80;
		VerifyCodeUtils.outputImage(w, h, response.getOutputStream(),
				verifyCode);
	} 
}

VerifyCodeUtils类(main方法可直接执行保存为文件):

package com.lbz;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 * [说明/描述]
 * 
 * @author LBZ
 * @date 2015-7-15 下午5:28:13
 * @project 
 * @version v1.0
 * @see 相关类
 * @since 相关/版本
 */
public class VerifyCodeUtils {
	// 使用到Algerian字体,系统里没有的话需要安装字体,字体只显示大写,去掉了1,0,i,o几个容易混淆的字符
	public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
	private static Random random = new Random();

	/**
	 * 使用系统默认字符源生成验证码
	 * 
	 * @param verifySize
	 *            验证码长度
	 * @return
	 */
	public static String generateVerifyCode(int verifySize) {
		return generateVerifyCode(verifySize, VERIFY_CODES);
	}

	/**
	 * 使用指定源生成验证码
	 * 
	 * @param verifySize
	 *            验证码长度
	 * @param sources
	 *            验证码字符源
	 * @return
	 */
	public static String generateVerifyCode(int verifySize, String sources) {
		if (sources == null || sources.length() == 0) {
			sources = VERIFY_CODES;
		}
		int codesLen = sources.length();
		Random rand = new Random(System.currentTimeMillis());
		StringBuilder verifyCode = new StringBuilder(verifySize);
		for (int i = 0; i < verifySize; i++) {
			verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
		}
		return verifyCode.toString();
	}

	/**
	 * 生成随机验证码文件,并返回验证码值
	 * 
	 * @param w
	 * @param h
	 * @param outputFile
	 * @param verifySize
	 * @return
	 * @throws IOException
	 */
	public static String outputVerifyImage(int w, int h, File outputFile,
			int verifySize) throws IOException {
		String verifyCode = generateVerifyCode(verifySize);
		outputImage(w, h, outputFile, verifyCode);
		return verifyCode;
	}

	/**
	 * 输出随机验证码图片流,并返回验证码值
	 * 
	 * @param w
	 * @param h
	 * @param os
	 * @param verifySize
	 * @return
	 * @throws IOException
	 */
	public static String outputVerifyImage(int w, int h, OutputStream os,
			int verifySize) throws IOException {
		String verifyCode = generateVerifyCode(verifySize);
		outputImage(w, h, os, verifyCode);
		return verifyCode;
	}

	/**
	 * 生成指定验证码图像文件
	 * 
	 * @param w
	 * @param h
	 * @param outputFile
	 * @param code
	 * @throws IOException
	 */
	public static void outputImage(int w, int h, File outputFile, String code)
			throws IOException {
		if (outputFile == null) {
			return;
		}
		File dir = outputFile.getParentFile();
		if (!dir.exists()) {
			dir.mkdirs();
		}
		try {
			outputFile.createNewFile();
			FileOutputStream fos = new FileOutputStream(outputFile);
			outputImage(w, h, fos, code);
			fos.close();
		} catch (IOException e) {
			throw e;
		}
	}

	/**
	 * 输出指定验证码图片流
	 * 
	 * @param w
	 * @param h
	 * @param os
	 * @param code
	 * @throws IOException
	 */
	public static void outputImage(int w, int h, OutputStream os, String code)
			throws IOException {
		int verifySize = code.length();
		BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
		Random rand = new Random();
		Graphics2D g2 = image.createGraphics();
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		Color[] colors = new Color[5];
		Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
				Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
				Color.PINK, Color.YELLOW };
		float[] fractions = new float[colors.length];
		for (int i = 0; i < colors.length; i++) {
			colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
			fractions[i] = rand.nextFloat();
		}
		Arrays.sort(fractions);

		g2.setColor(Color.GRAY);// 设置边框色
		g2.fillRect(0, 0, w, h);

		Color c = getRandColor(200, 250);
		g2.setColor(Color.WHITE);// 设置背景色
		g2.fillRect(0, 2, w, h - 4);

		// 绘制干扰线
		Random random = new Random();
		g2.setColor(getRandColor(160, 200));// 设置线条的颜色
		for (int i = 0; i < 20; i++) {
			int x = random.nextInt(w - 1);
			int y = random.nextInt(h - 1);
			int xl = random.nextInt(6) + 1;
			int yl = random.nextInt(12) + 1;
			g2.drawLine(x, y, x + xl + 40, y + yl + 20);
		}

		// 添加噪点
		float yawpRate = 0.05f;// 噪声率
		int area = (int) (yawpRate * w * h);
		for (int i = 0; i < area; i++) {
			int x = random.nextInt(w);
			int y = random.nextInt(h);
			int rgb = getRandomIntColor();
			image.setRGB(x, y, rgb);
		}

		shear(g2, w, h, c);// 使图片扭曲

		g2.setColor(getRandColor(100, 160));
		int fontSize = h - 10;
		g2.setFont(getRandFont(fontSize));
		char[] chars = code.toCharArray();
		for (int i = 0; i < verifySize; i++) {
			AffineTransform affine = new AffineTransform();
			affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize / 2, h / 2);
			g2.setTransform(affine);
			g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
			
		}

		g2.dispose();
		ImageIO.write(image, "jpg", os);
	}
	
	private static Font getRandFont(int fontSize){
		Font font = new Font("Algerian", Font.ITALIC, fontSize);
		try {
			int rand = (int) Math.round(Math.random()*7 + 1);
			System.out.println(rand);
			switch (rand) {
			case 1:
				font = new Font("Algerian", Font.ITALIC, fontSize);
				break;
			case 2:
				font = new Font("DIALOG", Font.ITALIC, fontSize);
				break;
			case 3:
				font = new Font("Impact", Font.ITALIC, fontSize);
				break;
			case 4:
				//font = new Font("Kristen ITC", Font.ITALIC, fontSize);
				break;
			case 5:
				font = new Font("幼圆", Font.ITALIC, fontSize);
				break;
			case 6:
				//font = new Font("Jokerman", Font.ITALIC, fontSize);
				break;
			case 7:
				break;
			case 8:
				font = new Font("Niagara Solid", Font.ITALIC, fontSize);
				break;
			default:
				font = new Font("Algerian", Font.ITALIC, fontSize);
				break;
			}
		} catch (Exception e) {
		}
		return font;
	}

	/**
	 * 
	 * [获取随机颜色对象] <br>
	 * @author LBZ <br>
	 * @date 2015-7-15 下午5:52:11 <br>
	 * @param fc
	 * @param bc
	 * @return <br>
	 */
	private static Color getRandColor(int fc, int bc) {
		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);
	}

	/**
	 * 
	 * [获取随机颜色值] <br>
	 * @author LBZ <br>
	 * @date 2015-7-15 下午5:52:23 <br>
	 * @return <br>
	 */
	private static int getRandomIntColor() {
		int[] rgb = getRandomRgb();
		int color = 0;
		for (int c : rgb) {
			color = color << 8;
			color = color | c;
		}
		return color;
	}

	/**
	 * 
	 * [获取随机的RGB数组] <br>
	 * @author LBZ <br>
	 * @date 2015-7-15 下午5:52:38 <br>
	 * @return <br>
	 */
	private static int[] getRandomRgb() {
		int[] rgb = new int[3];
		for (int i = 0; i < 3; i++) {
			rgb[i] = random.nextInt(255);
		}
		return rgb;
	}

	/**
	 * 
	 * [扭曲图片] <br>
	 * 
	 * @author LBZ <br>
	 * @date 2015-7-15 下午5:35:16 <br>
	 * @param g
	 * @param w1
	 * @param h1
	 * @param color
	 * <br>
	 */
	private static void shear(Graphics g, int w1, int h1, Color color) {
		shearX(g, w1, h1, color);
		shearY(g, w1, h1, color);
	}

	/**
	 * 
	 * [横向扭曲] <br>
	 * 
	 * @author LBZ<br>
	 * @date 2015-7-15 下午5:35:33 <br>
	 * @param g
	 * @param w1
	 * @param h1
	 * @param color
	 * <br>
	 */
	private static void shearX(Graphics g, int w1, int h1, Color color) {

		int period = random.nextInt(2);

		boolean borderGap = true;
		int frames = 1;
		int phase = random.nextInt(2);

		for (int i = 0; i < h1; i++) {
			double d = (double) (period >> 1)
					* Math.sin((double) i / (double) period
							+ (6.2831853071795862D * (double) phase)
							/ (double) frames);
			g.copyArea(0, i, w1, 1, (int) d, 0);
			if (borderGap) {
				g.setColor(color);
				g.drawLine((int) d, i, 0, i);
				g.drawLine((int) d + w1, i, w1, i);
			}
		}

	}

	/**
	 * 
	 * [纵向扭曲] <br>
	 * 
	 * @author LBZ <br>
	 * @date 2015-7-15 下午5:35:59 <br>
	 * @param g
	 * @param w1
	 * @param h1
	 * @param color
	 * <br>
	 */
	private static void shearY(Graphics g, int w1, int h1, Color color) {

		int period = random.nextInt(40) + 10; // 50;

		boolean borderGap = true;
		int frames = 20;
		int phase = 7;
		for (int i = 0; i < w1; i++) {
			double d = (double) (period >> 1)
					* Math.sin((double) i / (double) period
							+ (6.2831853071795862D * (double) phase)
							/ (double) frames);
			g.copyArea(i, 0, 1, h1, 0, (int) d);
			if (borderGap) {
				g.setColor(color);
				g.drawLine(i, (int) d, i, 0);
				g.drawLine(i, (int) d + h1, i, h1);
			}

		}

	}

	public static void main(String[] args) throws IOException {
		File dir = new File("F:/verifies");
		int w = 200, h = 80;
		for (int i = 0; i < 10; i++) {
			String verifyCode = generateVerifyCode(4);
			File file = new File(dir, verifyCode + ".jpg");
			outputImage(w, h, file, verifyCode);
		}
	}
}

web.xml配置


<servlet>  
    <servlet-name>AuthImage</servlet-name>  
    <servlet-class>com.lbz.AuthImage</servlet-class>  
</servlet>  
<servlet-mapping>  
    <servlet-name>AuthImage</servlet-name>  
    <url-pattern>/authImage</url-pattern>  
</servlet-mapping>
    感谢打赏

    微信打赏

    支付宝打赏

    © 2012-2019    豫ICP备14005100号-1