图片验证码生成

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代码地址:点击打开链接

package util.image;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.imageio.ImageIO;/** * to buide image * @author  沈健 * */public class ImageVertifyUtil {/* * 字典符 */private static final char[] CHARS={'2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z'};//除去不容易辨认的字符private static Random random=new Random();//获取随机数private static String getRandomString(){//生成6位随机验证码StringBuffer buffer=new StringBuffer();for(int i=0;i<6;i++){buffer.append(CHARS[random.nextInt(CHARS.length)]);}return buffer.toString();}private static Color getRandomColor(){//获取随机的颜色return new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255));}private static Color getReverseColor(Color color){//获取某颜色的反色return new Color(255-color.getRed(),255-color.getGreen(),255-color.getBlue());}/** * 返回生成的字符串 */public static String buildImage(OutputStream  os){final int width=100;final int height=30;BufferedImage bi=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);//创建一个彩色图片Graphics2D g=bi.createGraphics();//获取彩色对象g.setFont(new Font(Font.SANS_SERIF,Font.BOLD,16));Color color=getRandomColor();g.setColor(color);g.fillRect(0, 0, width, height);g.setColor(getReverseColor(color));String string=getRandomString();//生成的字符g.drawString(string, 18, 20);for(int i=0,n=random.nextInt(100);i<n;i++){//画最多100个噪音点g.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);}g.dispose();try {ImageIO.write(bi, "jpg",os);} catch (IOException e) {e.printStackTrace();}return string;}}

测试类:

package util.image.test;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import org.junit.Test;import util.image.ImageVertifyUtil;public class ImageVertifyUtilTest {@Testpublic void testImageVertifyUtil() throws IOException{OutputStream os=new FileOutputStream("d:\\a.jpg");ImageVertifyUtil.buildImage(os);os.close();}}

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