Java代码随机生成图片验证码-蒲公英云

-—ValidateCode.java 验证码生成类
package cn.dsna.util.images;

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

import javax.imageio.ImageIO;
/**
* 验证码生成器
* @author dsna
*
*/
public class ValidateCode {
// 图片的宽度。
private int width = 160;
// 图片的高度。
private int height = 40;
// 验证码字符个数
private int codeCount = 5;
// 验证码干扰线数
private int lineCount = 150;
// 验证码
private String code = null;
// 验证码图片Buffer
private BufferedImage buffImg=null;

private char\[\] codeSequence = \{ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',     
        'K', 'L', 'M', 'N',  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',     
        'X', 'Y', 'Z',  '1', '2', '3', '4', '5', '6', '7', '8', '9' \};     
public  ValidateCode() \{     
    this.createCode();     
\}     
/\*\*    
 \*     
 \* @param width 图片宽    
 \* @param height 图片高    
 \*/    
public  ValidateCode(int width,int height) \{     
    this.width=width;     
    this.height=height;     
    this.createCode();     
\}     
/\*\*    
 \*     
 \* @param width 图片宽    
 \* @param height 图片高    
 \* @param codeCount 字符个数    
 \* @param lineCount 干扰线条数    
 \*/    
public  ValidateCode(int width,int height,int codeCount,int lineCount) \{     
    this.width=width;     
    this.height=height;     
    this.codeCount=codeCount;     
    this.lineCount=lineCount;     
    this.createCode();     
\}     
public void createCode() \{     
    int x = 0,fontHeight=0,codeY=0;     
    int red = 0, green = 0, blue = 0;     
    x = width / (codeCount +2);//每个字符的宽度     
    fontHeight = height - 2;//字体的高度     
    codeY = height - 4;     
    // 图像buffer     
    buffImg = new BufferedImage(width, height,BufferedImage.TYPE\_INT\_RGB);     
    Graphics2D g = buffImg.createGraphics();     
    // 生成随机数     
    Random random = new Random();     
    // 将图像填充为白色     
    g.setColor(Color.WHITE);     
    g.fillRect(0, 0, width, height);     
    // 创建字体     
    ImgFontByte imgFont=new ImgFontByte();     
    Font font =imgFont.getFont(fontHeight);     
    g.setFont(font);     
    for (int i = 0; i < lineCount; i++) \{     
        int xs = random.nextInt(width);     
        int ys = random.nextInt(height);     
        int xe = xs+random.nextInt(width/8);     
        int ye = ys+random.nextInt(height/8);     
        red = random.nextInt(255);     
        green = random.nextInt(255);     
        blue = random.nextInt(255);     
        g.setColor(new Color(red, green, blue));     
        g.drawLine(xs, ys, xe, ye);     
    \}     
    // randomCode记录随机产生的验证码     
    StringBuffer randomCode = new StringBuffer();     
    // 随机产生codeCount个字符的验证码。     
    for (int i = 0; i < codeCount; i++) \{     
        String strRand = String.valueOf(codeSequence\[random.nextInt(codeSequence.length)\]);     
        // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。     
        red = random.nextInt(255);     
        green = random.nextInt(255);     
        blue = random.nextInt(255);     
        g.setColor(new Color(red, green, blue));     
        g.drawString(strRand, (i + 1) \* x, codeY);     
        // 将产生的四个随机数组合在一起。     
        randomCode.append(strRand);     
    \}     
    // 将四位数字的验证码保存到Session中。     
    code=randomCode.toString();          
\}     
public void write(String path) throws IOException \{     
    OutputStream sos = new FileOutputStream(path);     
        this.write(sos);     
\}     
public void write(OutputStream sos) throws IOException \{     
        ImageIO.write(buffImg, "png", sos);     
        sos.close();     
\}     
public BufferedImage getBuffImg() \{     
    return buffImg;     
\}     
public String getCode() \{     
    return code;     
\}

}

-—ImgFontByte.java

package cn.dsna.util.images;
import java.io.ByteArrayInputStream;
import java.awt.*;
/**
* ttf字体文件
* @author dsna
*
*/
public class ImgFontByte {
public Font getFont(int fontHeight){
try {
Font baseFont = Font.createFont(Font.TRUETYPE_FONT, new ByteArrayInputStream(hex2byte(getFontByteStr())));
return baseFont.deriveFont(Font.PLAIN, fontHeight);
} catch (Exception e) {
return new Font(“Arial”,Font.PLAIN, fontHeight);
}
}

private  byte\[\] hex2byte(String str) \{      
    if (str == null)     
        return null;     
    str = str.trim();     
    int len = str.length();     
    if (len == 0 || len % 2 == 1)     
        return null;     
    byte\[\] b = new byte\[len / 2\];     
    try \{     
        for (int i = 0; i < str.length(); i += 2) \{     
            b\[i / 2\] = (byte) Integer     
                    .decode("0x" + str.substring(i, i + 2)).intValue();     
        \}     
        return b;     
    \} catch (Exception e) \{     
        return null;     
    \}     
\} /\*\*

* ttf字体文件的十六进制字符串
* @return
*/
private String getFontByteStr(){ return null;
return str;//字符串太长在附件中找
}
}

-—ValidateCodeServlet.java Servlet调用方法
package cn.dsna.util.images;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ValidateCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

@Override    
protected void doGet(HttpServletRequest reqeust,     
        HttpServletResponse response) throws ServletException, IOException \{     
    // 设置响应的类型格式为图片格式     
    response.setContentType("image/jpeg");     
    //禁止图像缓存。     
    response.setHeader("Pragma", "no-cache");     
    response.setHeader("Cache-Control", "no-cache");     
    response.setDateHeader("Expires", 0);     
    HttpSession session = reqeust.getSession();     
    ValidateCode vCode = new ValidateCode(120,40,5,100);     
    session.setAttribute("code", vCode.getCode());     
    vCode.write(response.getOutputStream());     
\}

/**
* web.xml 添加servlet

validateCodeServlet
cn.dsna.util.images.ValidateCodeServlet

validateCodeServlet
*.images

在地址栏输入XXX/dsna.images 测试
*/

}
-——ValidateCodeTest.java测试类

package cn.dsna.util.images;

import java.io.IOException;
import java.util.Date;

public class ValidateCodeTest {

/\*\*    
 \* @param args    
 \*/    
public static void main(String\[\] args) \{     
    ValidateCode vCode = new ValidateCode(120,40,5,100);     
    try \{     
        String path="D:/t/"+new Date().getTime()+".png";     
        System.out.println(vCode.getCode()+" >"+path);     
        vCode.write(path);     
    \} catch (IOException e) \{     
        e.printStackTrace();     
    \}     
\}