Java生成图形验证码工具类

Java生成图形验证码工具类

生成验证码效果

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;

thiKoUbiSs.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

*/

}

测试类

ValidateCodeTest.java

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();

}

}

}

web.xml 配置

validateCodeServlet

cn.dsna.util.images.ValidateCodeServlet

validateCodeServlet

*.images

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