JAVA图片验证码(转自“云在青山”)

  首先创建一个生成图片的类,设置一些请求参数,生成随机的字符串,然后字符串传给生成验证码图片的类进行处理,完成后输出到页面

1.创建验证码生成类

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);

    }
}

2.创建验证码图片生成类

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);
        }
    }
}

3.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>
时间: 2024-10-08 10:17:19

JAVA图片验证码(转自“云在青山”)的相关文章

java图片验证码包括文字和图片的旋转

java图片验证码包括文字图片的旋转: 此例子演示的是两位数的加减运算,需要的可以通过自己的修改获得更多的方式: 或者我上传的资源中也有其他的两种方式供选择:http://download.csdn.net/detail/huitoukest/8043711 package com.utils; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; im

工作笔记5.JAVA图片验证码

本文主要内容为:利用JAVA图片制作验证码. 设计思路: 1.拷贝AuthImageServlet.class图片验证码 2.配置web.xml 3.JSP中,调用封装好的AuthImageServlet,实现载入验证码的功能. 4.取出存放在Session中的验证码.在Action中推断验证码的正确性 相比較上一篇博客<工作笔记5.JAVA文本框验证码>而言,图片验证码添加了安全性. 在Action中,通过取出Session中的验证码与输入的验证码是否匹配进行推断. 步骤: 1.拷贝Auth

问题记录-java图片验证码显示乱码

部署机器 操作系统:centos 7 java版本: java version "1.7.0_80" 问题症状 将一个java web的程序部署到了两台配置相同的服务器上之后(服务器1.服务器2),程序都正常启动,当前端请求注册服务时,会向后台请求图片验证码,然而(服务器1)验证码出现了如图1所示的乱码问题,图二为(服务器2)正常的验证码显示. 图1 图2 问题探索 猜测1:java字符的编码问题 探索过程:将字符编码转换成utf-8编码,但是乱码问题没有得到解决 猜测2:服务器字体问

自己封装的一个java图片验证码

验证码生成器: 1 package com.lz.Tools; 2 3 import java.awt.Color; 4 import java.awt.Font; 5 import java.awt.Graphics; 6 import java.awt.Graphics2D; 7 import java.awt.image.BufferedImage; 8 import java.util.Random; 9 10 /** 11 * 验证码生成器 12 * 13 * @author boji

JAVA图片验证码

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

Ubuntu java 图片验证码问题

Oracle JDK 版本: wget http://download.oracle.com/otn-pub/java/jdk/7u71-b14/jdk-7u71-linux-x64.tar.gz\?AuthParam\=1413444038_57c11ebacd07d2252b6288d3e1b6f85f 将其解压安装好.

java web中图片验证码功能实现

用户在注册网站信息的时候基本上都要数据验证码验证.那么图片验证码功能该如何实现呢? 大概步骤是: 1.在内存中创建缓存图片 2.设置背景色 3.画边框 4.写字母 5.绘制干扰信息 6.图片输出 废话不多说,直接上代码 package com.lsgjzhuwei.servlet.response; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.Buffer

java生成验证码图片

public class AuthImg extends HttpServlet { /** * */ private static final long serialVersionUID = 4975974534946437434L; // 设置图形验证码字符串的字体和大小 private Font mFont = new Font("微软雅黑", Font.ITALIC, 18); private Random random = new Random(); public void

JAVA生成一次性图片验证码

现在很多地方都需要写验证码登录验证,这样的好处是可以减轻服务器的压力等,下面就用java实现一次性登录验证码的书写. 1.验证码生成类: package com.easyteam; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedI