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Java随机验证码

/*
 * RandomCodeImage.java 
 * Created on Jun 3, 2008 5:57:28 PM
 * Copyright (c) IBEX  All Rights Reserved.
 *
 * This software is the confidential and proprietary information of IBEX.
 * You shall not disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with IBEX.
 */
        
package net.mmgg.commons;
        
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontFormatException;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.Paint;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Random;
        
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
        
public class RandomCodeImage {
    public static ArrayList fonts = null;
    // 单例模式
    private static RandomCodeImage instance = null;
    // 定义验证码内容
    private String codes = null;
        
    //乘法口诀常量
    private  final int MULTIPLY=1;//乘
    private  final int DIVIDED=2;//除
    private  final int PLUS=3;//加
    private  final int SUBTRACT=4;//减
    /**
     * 单例模式
     * 
     * @date Jun 13, 2008 9:27:42 AM
     * @author Fly(Fly@mmgg.net)
     * @return
     */
    public static RandomCodeImage getInstance() {
        if (null == instance) {
            instance = new RandomCodeImage();
        }
        return instance;
    }
    /**
     * 公共构造函数,加载用户自定义字体
     * @date Jun 13, 2008 4:31:22 PM
     * @author Fly(Fly@mmgg.net)
     * @param fontName 字体名集合
     */
    public RandomCodeImage(String[] fontName){
        if(null!=fonts){
            return;
        }
        Font font=null;
        fonts=new ArrayList();
        for (int i = 0; i < fontName.length; i++) {
            font=new Font(fontName[i],Font.PLAIN,14);
            fonts.add(font);
        }
                
    }
    /**
     * 公共构造函数,根据字体文件所在的文件夹,加载用户自定义字体,只支持TTF字体
     * @date Jun 13, 2008 5:17:08 PM
     * @author Fly(Fly@mmgg.net)
     * @param fontsPath
     */
    public RandomCodeImage(String fontsPath){
        if(null!=fonts){
            return;
        }
        List fontlist=this.readfile(fontsPath, "TTF");
        fonts = new ArrayList();
        for (Iterator iterator = fontlist.iterator(); iterator.hasNext();) {
            String object = (String) iterator.next();
            File file_ = new File(object); 
            try {
                Font font_ = Font.createFont(Font.TRUETYPE_FONT, file_);
                fonts.add(font_);
            } catch (FontFormatException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
        
    /**
     * 私有构造函数,加载系统默认字体
     * @date Jun 13, 2008 9:27:08 AM
     * @author Fly(Fly@mmgg.net)
     */
    private RandomCodeImage() {
        if(null!=fonts){
            return;
        }
        fonts = new ArrayList();
        GraphicsEnvironment.getLocalGraphicsEnvironment().preferLocaleFonts();
        String[] names = GraphicsEnvironment.getLocalGraphicsEnvironment()
                .getAvailableFontFamilyNames(Locale.getDefault());
        for (int i = 0; i < names.length; i++) {
            char c = names[i].charAt(0);
            if (Character.isLowerCase(c) || Character.isUpperCase(c)) {
            } else {
                fonts.add(new Font(names[i],Font.PLAIN,14));
            }
        }
    }
        
    /**
     * 生成数字和字母验证码
     * 
     * @date Jun 13, 2008 9:25:49 AM
     * @author Fly(Fly@mmgg.net)
     * @return
     * @throws Exception
     */
    private BufferedImage getImageOfABC123(){
        BufferedImage bi = new BufferedImage(150, 50,
                BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        String code = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
        char[] cs = code.toCharArray();
        char[] use = new char[5];
        g.setColor(this.getBgColor());
        g.fillRect(0, 0, 150, 50);
        codes="";
          java.awt.geom.AffineTransform   af=new   AffineTransform();   
          af.setToRotation(Math.PI/2.0);   
        for (int i = 0; i < 5; i++) {
            //抗锯齿,图片不失真
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);   
            Point p = getPoint(i);
            int size = getSize();
            use[i] = cs[(int) (Math.random() * cs.length)];
            g.setPaint(getPaint(p, size));
            g.setFont(((Font) fonts.get((int) (Math.random() * fonts.size()))).deriveFont(this.getFace(), this.getSize()));
            g.drawString("" + use[i], p.x, p.y);
            codes += use[i];
        }
        g.setStroke(new BasicStroke(1.5f));
        g.setPaint(null);
        //画干扰线
        this.drawLine(g, 2,200,50);
        //画杂点
        this.drawPoint(g, 50,150,50);
        // 画个边框
        //g.setColor(new Color((int) (Math.random() * 0x00FFFFFFF)));
        //g.drawRect(1, 1, 150 - 2, 50 - 2);
        g.dispose();
        bi.flush();
        return bi;
    }
        
    /**
     * 设置背景颜色
     * 
     * @date Jun 13, 2008 9:26:15 AM
     * @author Fly(Fly@mmgg.net)
     * @return
     */
    private Color getBgColor() {
        Random r = new Random();
        int x = r.nextInt(256);
        x = x > 105 ? x : (x + 150);
        return new Color(x, x, x);
    }
        
    private Stroke getStroke() {
        BasicStroke bs = new BasicStroke((float) (Math.random() * 3));
        return bs;
    }
        
    /**
     * 文字距离
     * 
     * @date Jun 13, 2008 9:26:36 AM
     * @author Fly(Fly@mmgg.net)
     * @param index
     * @return
     */
    private Point getPoint(int index) {
        return new Point(5 + (index * ((int) (Math.random() * 6) + 24)), 40);
    }
        
    private Paint getPaint(Point p, int size) {
        GradientPaint gp = new GradientPaint(p.x, p.y, new Color((int) (Math
                .random() * 200), 0, (int) (Math.random() * 200)), p.x, p.y
                - size, new Color((int) (Math.random() * 200), (int) (Math
                .random() * 200), (int) (Math.random() * 200)));
        return gp;
    }
        
    /**
     * 字体样式
     * 
     * @date Jun 5, 2008 1:44:15 PM
     * @author Fly(Fly@mmgg.net)
     * @return
     */
    private int getFace() {
        if (Math.random() * 10 > 5) {
            return Font.BOLD;
        } else {
            return Font.ITALIC;
        }
    }
        
    /**
     * 字体大小
     * 
     * @date Jun 5, 2008 1:44:00 PM
     * @author Fly(Fly@mmgg.net)
     * @return
     */
    private int getSize() {
        int[] sizes = new int[20];
        for (int i = 0; i < 20; i++) {
            sizes[i] = 30 + i;
        }
        return sizes[(int) (Math.random() * sizes.length)];
    }
        
        
    /**
     * 获取验证码图像,并把图像用流输出
     * 生成字母和数字的验证码
     * @date Jun 13, 2008 3:19:12 PM
     * @author Fly(Fly@mmgg.net)
     * @param imageType  验证码输出的类型,可以是PNG或者JPGE
     * @param output 输出流
     * @return 验证码字符串
     * @throws IOException 
     */
    public String drawImageOfABC123( OutputStream output) throws IOException {
        try {
            this.drawImage(this.getImageOfABC123(), output);
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        } finally{
            output.flush();
            output.close();
        }
        return codes;
    }
    public String drawImageOfABC123( ByteArrayOutputStream output) throws IOException {
        try {
            //ImageIO.write(this.getImageOfABC123(), imageType.toUpperCase(), output);
            this.drawImage(this.getImageOfABC123(), output);
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }finally{
            output.flush();
            output.close();
        }
        return codes;
    }
            
    /**
     * 获取验证码图像,并把图像用流输出
     * 生成加减乘除的验证码
     * @date Jun 13, 2008 3:20:40 PM
     * @author Fly(Fly@mmgg.net)
     * @param imageType  验证码输出的类型,可以是PNG或者JPGE
     * @param output  输出流
     * @return 验证码字符串
     * @throws IOException 
     */
    public String drawImageOfMultiplicationFormula(OutputStream output) throws IOException{
        try {
            this.drawImage(this.getImageOfMultiplicationFormula(), output);
            //ImageIO.write(this.getImageOfMultiplicationFormula(), imageType.toUpperCase(), output);
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }finally{
            output.flush();
            output.close();
        }
        
        return codes;
    }
    public String drawImageOfMultiplicationFormula(ByteArrayOutputStream output) throws IOException{
        try {
            this.drawImage(this.getImageOfMultiplicationFormula(), output);
            //ImageIO.write(this.getImageOfMultiplicationFormula(), imageType.toUpperCase(), output);
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }
        finally{
            output.flush();
            output.close();
        }
                
        return codes;
    }
    /**
     * 获取验证码图像,并把图像用流输出
     * 生成中文汉字的验证码
     * @date Jun 13, 2008 3:13:15 PM
     * @author Fly(Fly@mmgg.net)
     * @param imageType  验证码输出的类型,可以是PNG或者JPGE
     * @param output 输出流
     * @return  验证码字符串
     * @throws IOException 
     */
    public String drawImageOfChineseChar(OutputStream output) throws IOException{
        try {
            //ImageIO.write(this.getImageOfChineseChar(), imageType.toUpperCase(), output);
            this.drawImage(this.getImageOfChineseChar(), output);
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }finally{
            output.flush();
            output.close();
        }
        return codes;
    }
    public String drawImageOfChineseChar(ByteArrayOutputStream output) throws IOException{
        try {
            this.drawImage(this.getImageOfChineseChar(), output);
            //ImageIO.write(this.getImageOfChineseChar(), imageType.toUpperCase(), output);
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }finally{
            output.flush();
            output.close();
        }
        return codes;
    }
    /**
     * 产生清晰的图片
     * @Author:吴云辉
     * @date:Oct 22, 2009 9:47:42 AM
     * @param image
     * @param output
     * @throws IOException
     */
    private void drawImage(BufferedImage image,Object output) throws IOException{
        //BufferedImage image =this.getImageOfABC123();
        //ImageIO.write(this.getImageOfABC123(), imageType.toUpperCase(), output);
        ImageWriter writer = null;
        ImageTypeSpecifier type = ImageTypeSpecifier.createFromRenderedImage(image);
        Iterator<ImageWriter> iter = ImageIO.getImageWriters(type, "JPG");
        if (iter.hasNext()) {
            writer = (ImageWriter) iter.next();
        }
        IIOImage iioImage = new IIOImage(image, null, null);
        ImageWriteParam param = writer.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
                
        param.setCompressionQuality((float) (1));
        ImageOutputStream outputStream = ImageIO.createImageOutputStream(output);
        writer.setOutput(outputStream);
        writer.write(null, iioImage, param);
        }
        
    /**
     * 产生从X到Y的随机数
     * 
     * @date Jun 13, 2008 9:59:47 AM
     * @author Fly(Fly@mmgg.net)
     * @param x
     * @param y
     * @return
     */
    private int getRandom(int x, int y) {
        return new Random().nextInt(y - x + 1) + x;
    }
            
        
    /**
     * 生成乘法口诀类似的加、减、乘、除运算公式
     * 
     * @date Jun 13, 2008 10:03:37 AM
     * @author Fly(Fly@mmgg.net)
     * @return
     */
    private BufferedImage getImageOfMultiplicationFormula(){
        String cds=this.getMultiplication(this.getRandom(1, 4));
        int width_;
        final int height_=50;
        //根据文字的长度设置图片的宽度
        switch (cds.length()) {
            case 7:width_=160;break;
            case 8:width_=180;break;
            case 6:width_=140;break;
            case 5:width_=120;break;
            default:width_=150;break;
        }
        BufferedImage bi = new BufferedImage(width_, height_,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        //抗锯齿,图片不失真
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);   
        g.setColor(this.getBgColor());
        g.fillRect(0, 0, width_, height_);
        for (int i=0;i<cds.length();i++){
            g.setColor(new Color((int) (Math.random() * 100), (int) (Math.random() * 100), (int) (Math.random() * 100)));
            g.setFont(((Font) fonts.get((int) (Math.random() * fonts.size()))).deriveFont(this.getFace(), 25));
            g.drawString(String.valueOf(cds.charAt(i)),22*i+5,35);
        }
        //画干扰线
        this.drawLine(g, 3,200,50);
        //画杂点
        this.drawPoint(g, 30,width_,height_);
        // 画个边框
        //g.setColor(new Color((int) (Math.random() * 0x00FFFFFFF)));
        //g.drawRect(1, 1, width_ - 2, height_ - 2);
        g.dispose();
        bi.flush();
        return bi;
    }
            
    private String getMultiplication(int type) {
        int a,b,v;
        String ret=null;
        if(type>this.DIVIDED){
            a=this.getRandom(0, 99);
            b=this.getRandom(0, 99);
        }else{
            a=this.getRandom(0, 9);
            b=this.getRandom(0, 9);
        }
        //乘以
            if(this.MULTIPLY==type){
                v=a*b;
                this.codes=String .valueOf(v);
                ret=this.getArithmetic(a, b, type);
                return ret;
            }
        //除以
            if(this.DIVIDED==type){
                //保证除数不为0
                b=this.getRandom(1, 9);
                v=a*b;
                this.codes=String.valueOf(a);
                ret=this.getArithmetic(v, b, type);
                return ret;
            }
        //加上
            if(this.PLUS==type){
                v=a+b;
                this.codes=String.valueOf(v);
                ret=this.getArithmetic(a, b, type);
                return ret;
            }
        //减去
            if(this.SUBTRACT==type){
                v=a+b;
                this.codes=String.valueOf(a);
                ret=this.getArithmetic(v, b, type);
                return ret;
            }
        return ret;
    }
    private String getArithmetic(int a,int b,int type){
        String str="";
        switch (type) {
        case MULTIPLY:
            str=a+"×"+b+"=?";
            break;
        case DIVIDED:
            str=a+"÷"+b+"=?";
            break;
        case PLUS:
            str=a+"+"+b+"=?";
            break;
        case SUBTRACT:
            str=a+"-"+b+"=?";
            break;
        default:
            str=a+"×"+b+"=?";
            break;
        }
        return str;
    }
    /**
     * 得到随机常用汉字
     * 从2500个常用汉字中选
     * @date Jun 13, 2008 2:18:53 PM
     * @author Fly(Fly@mmgg.net)
     * @return
     */
    private char getRandomChineseChar()
    {
        String 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u7f50";
        return str.charAt(this.getRandom(0, str.length()-1));
    }
    /**
     * 生成汉字验证码
     * 
     * @date Jun 13, 2008 3:14:14 PM
     * @author Fly(Fly@mmgg.net)
     * @return
     */
    private BufferedImage getImageOfChineseChar(){
        BufferedImage bi = new BufferedImage(150, 50,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        g.setColor(this.getBgColor());
        g.fillRect(0, 0, 150, 50);  
        codes="";
        for (int i = 0; i < 4; i++) {
            //抗锯齿,图片不失真
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);   
            String rands=String.valueOf(this.getRandomChineseChar());
            g.setColor(new Color((int) (Math.random() * 200), 0, (int) (Math.random() * 200)));
            g.setFont(((Font) fonts.get((int) (Math.random() * fonts.size()))).deriveFont(this.getFace(), 28));
            g.drawString(rands,32*i+10,35);
            codes+=rands;
        }
        //画干扰线
        this.drawLine(g, 2,150,50);
        //画杂点
        this.drawPoint(g, 20,150,50);
        // 画个边框
        //g.setColor(new Color((int) (Math.random() * 0x00FFFFFFF)));
        //g.drawRect(1, 1, 150 - 2, 50 - 2);
        g.dispose();
        bi.flush();
        return bi;
    }
    /**
     * 读取文件
     * 
     * @date Jun 13, 2008 4:35:09 PM
     * @author Fly(Fly@mmgg.net)
     * @param filepath
     * @param ext
     * @return
     * @throws FileNotFoundException
     * @throws IOException
     */
    private List readfile(String filepath, String ext){
        List list = new ArrayList();
        try {
            File file = new File(filepath);
            //如果不是字体路径那么就是字体文件
            if (!file.isDirectory()) {
                list.add(file.getPath());
            } else if (file.isDirectory()) {
                String[] filelist = file.list();
                for (int i = 0; i < filelist.length; i++) {
                    File readfile = new File(filepath + "/" + filelist[i]);
                    if (!readfile.isDirectory()) {
                        int x = filelist[i].lastIndexOf('.');
                        if (filelist[i].substring(x + 1).toLowerCase().equals(ext.toLowerCase())) {
                            list.add(readfile.getPath());
                        }
                    } else if (readfile.isDirectory()) {
                        //不再判断子文件夹
                        continue;
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }
    /**
     * 在图片画杂点
     * @date Sep 12, 2008 4:41:46 PM
     * @author Fly(Fly@mmgg.net)
     * @param g
     * @param num 杂点数目
     * @param width 基于原点的最宽位置
     * @param height 基于原点的最高位置
     */
    private void drawPoint(Graphics2D g,int num,int width,int height){
        Random random = new Random();
        for (int i = 0; i < num; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            g.setColor(new Color((int) (Math.random() * 0x00FFFFFFF)));
            g.setStroke(getStroke());
            g.drawLine(x, y, x, y);
        }
    }
    /**
     * 在图片上画直线
     * @date Sep 12, 2008 4:43:10 PM
     * @author Fly(Fly@mmgg.net)
     * @param g
     * @param num   线条数
     * @param width 基于原点的最宽位置
     * @param height    基于原点的最高位置
     */
    private void drawLine(Graphics2D g,int num,int width,int height){
        for (int i = 0; i < num; i++) {
            g.setColor(new Color((int) (Math.random() * 0x00FFFFFFF)));
            g.drawLine((int) (Math.random() * width), (int) (Math.random() * height),
                    (int) (Math.random() * width), (int) (Math.random() * height));
        }
    }
    public static void main(String[] args) throws IOException {
        //List ls=null; 
        RandomCodeImage c=new RandomCodeImage();
        try {
            FileOutputStream o=new FileOutputStream("c:\\a.jpg");
            FileOutputStream a=new FileOutputStream("c:\\b.jpg");
            FileOutputStream d=new FileOutputStream("c:\\c.jpg");
            //ImageIO.write(rotateJ2D(c.getImageOfABC123(),30),"JPG", o);
            System.out.println(c.drawImageOfABC123(o));
            System.out.println(c.drawImageOfChineseChar(a));
            System.out.println(c.drawImageOfMultiplicationFormula(d));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            throw e;
        }
        //System.out.println(c.getImageOfABC123());
        //System.out.println((int)(Math.random()*6+1));
    }
}
未经允许不得转载:正能量 » Java随机验证码

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