java图形验证码生成工具类

dsna

 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Bufferprivate 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bufferbuffImg = 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;@Overrideprotected 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<servlet><servlet-name>validateCodeServlet</servlet-name><servlet-class>cn.dsna.util.images.ValidateCodeServlet</servlet-class></servlet><servlet-mapping><servlet-name>validateCodeServlet</servlet-name><url-pattern>*.images</url-pattern></servlet-mapping>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
<servlet><servlet-name>validateCodeServlet</servlet-name><servlet-class>cn.dsna.util.images.ValidateCodeServlet</servlet-class></servlet><servlet-mapping><servlet-name>validateCodeServlet</servlet-name><url-pattern>*.images</url-pattern></servlet-mapping>