Java生成验证码DemoCode

package com.yueyi.bos.utils;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.PaintContext;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.font.FontRenderContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.util.Date;
import java.util.Random;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class VerifiCodeUtil {

    private static String[] fontNames = {"宋体","TimesRoman","Courier","Arial","楷体","黑体"};
    
    
    public static BufferedImage getBufferdImage(String str,int width,int height) {
        
        
        Random random = new Random(new Date().getTime());
        
        //设置背景颜色
        Color bgcolor = getRandomColor(random);

        
        
        int startx = 0;
        BufferedImage charImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
        Graphics2D charg = (Graphics2D) charImage.getGraphics();
        
        
        
        
        
        charg.setColor(bgcolor);;
        charg.fillRect(0, 0, width, height);
        
        for (int i = 0; i < str.length(); i++) {
            
            /* 随机旋转角度 */
            int degree = random.nextInt(360);
            
            /* 随机字体颜色 */
            Color frontcolor = getRandomColor(random);
            
            /* 随机字体  */
            String fontname = fontNames[random.nextInt(fontNames.length)];
            
            /* 是否加粗 */
            int isbold = random.nextInt(2);
            
            /* 随机字体大小 */
            int fontsize = 35 + random.nextInt(10);
            
            Font font = new Font(fontname,isbold ,fontsize);
            
            FontMetrics fm = sun.font.FontDesignMetrics.getMetrics(font);
            
            
            int charWidth = fm.charWidth(str.toCharArray()[i]);
            int charHeight = fm.getAscent(); 
            
            if(charWidth>charHeight) {
                startx  += charWidth /2 ;
            }else {
                startx  += charHeight /2 ;
            }
            
            
            int starty =  (height - charHeight)/2;
            
            int centerx = startx + charWidth/2;
            int centery = starty + charHeight/2;
            
            
            

            charg.translate(centerx, centery);
            charg.rotate(degree*Math.PI/180);
            charg.translate(-centerx, -centery);
            
            
            charg.setColor(frontcolor);
            charg.setFont(font);
            charg.drawString(""+str.toCharArray()[i], startx, starty+charHeight);
            
            charg.translate(centerx, centery);
            charg.rotate(-degree*Math.PI/180);
            charg.translate(-centerx, -centery);
            
            
            
            
            startx += charWidth;
        }
        
        /*干扰线*/
        for (int j = 0; j <5 + random.nextInt(10); j++) {
            int linex1 = random.nextInt(width);
            int liney1 = random.nextInt(height);
            
            int linex2 = random.nextInt(width);
            int liney2 = random.nextInt(height);
            
            int linewidth = random.nextInt(4) ;
            
            int arcx = random.nextInt(width);
            int arcy = random.nextInt(height);
            int arcw = random.nextInt(width);
            int arch = random.nextInt(height);
            int degree1 = random.nextInt(360);
            int degree2= random.nextInt(360);
            
            charg.setColor(getRandomColor(random));
            
            
            charg.setStroke( new BasicStroke( linewidth ) );
            
            charg.drawLine(linex1, liney1, linex2, liney2);
            charg.drawArc(arcx, arcy, arcw, arch, degree1, degree2);
            
        }
        
        /* 噪点 */
        for (int j = 0; j < 50+random.nextInt(10); j++) {
            
            int dotx  = random.nextInt(width-1);
            int doty = random.nextInt(height-1);
            
            Color randomColor = getRandomColor(random);
            int dotsize = random.nextInt(4) ;
            
            charg.setColor(randomColor);
            charg.setStroke(new BasicStroke(dotsize));
            
            charg.drawLine(dotx, doty, dotx, doty);
            
        }
        charg.dispose();
        return charImage;
        
        
    }
    
    private static Color getRandomColor(Random random) {
        char r = (char) random.nextInt(256);
        char g = (char) random.nextInt(256);
        char b = (char) random.nextInt(256);
        
        return new Color(r,g,b);
    }
    

    
    public static void main(String[] args) {  
          JFrame jFrame=new JFrame();  
          jFrame.setBounds(400, 400, 250, 250);  
            
          ImageIcon img = new ImageIcon(VerifiCodeUtil.getBufferdImage("ASdf23",300,100));   
          JLabel background = new JLabel(img);  
            
          jFrame.add(background);  
          jFrame.setVisible(true);  
          jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   
    }  
}

效果：