Java版仿QQ验证码风格图片验证码

本文为大家分享了Java版仿QQ验证码风格图片验证码，具体内容如下

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，随机字符偏移角度，字符平滑边缘，干扰线，噪点，背景扭曲。
本来想做字符扭曲的，不知道怎的先生成文字再扭曲就报错了，先就这样吧，希望有高手能帮助修正一下。
需要说明的是之所以有几分像QQ的验证码感觉是因为这个Algerian字体，如果系统没有的话需要自行安装，百度搜字体名能下载到，丢系统Fonts文件夹就行。

效果图：

package hh.com.util;

import java.io.IOException;

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

public class AuthImage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
 static final long serialVersionUID = 1L;

 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

package hh.com.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.LinearGradientPaint;
import java.awt.Paint;
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;

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(c);// 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-4;
  Font font = new Font("Algerian", Font.ITALIC, fontSize);
  g2.setFont(font);
  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 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);
 }

 private static int getRandomIntColor() {
  int[] rgb = getRandomRgb();
  int color = 0;
  for (int c : rgb) {
   color = color << 8;
   color = color | c;
  }
  return color;
 }

 private static int[] getRandomRgb() {
  int[] rgb = new int[3];
  for (int i = 0; i < 3; i++) {
   rgb[i] = random.nextInt(255);
  }
  return rgb;
 }

 private static void shear(Graphics g, int w1, int h1, Color color) {
  shearX(g, w1, h1, color);
  shearY(g, w1, h1, color);
 }

 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);
   }
  }

 }

 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 < 50; 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>hh.com.util.AuthImage</servlet-class>
  </servlet>
  <servlet-mapping>
   <servlet-name>AuthImage</servlet-name>
  <url-pattern>/authImage</url-pattern>
  </servlet-mapping>

以上就是本文的全部内容，希望能够对大家学习java图片验证码有所启发。