Java生成验证码的代码

package com.web;  //验证码生成处理类  import java.awt.BasicStroke;  import java.awt.Color;  import java.awt.Font;  import java.awt.Graphics;  import java.awt.Graphics2D;  import java.awt.geom.AffineTransform;  import java.awt.geom.Line2D;  import java.awt.image.BufferedImage;  import java.io.IOException;  import java.util.Random;    import javax.imageio.ImageIO;  import javax.servlet.ServletException;  import javax.servlet.http.HttpServlet;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;  import javax.servlet.http.HttpSession;    import com.tools.MD5;    public class PictureCheckCode extends HttpServlet{     private static final long serialVersionUID = 1L;      private Random rand=new Random();         /**    * 生成随机颜色    *     * @param   start  [int]    * @param   end    [int]    * @return  Color  [object]    */   public Color getRandColor(int start,int end){    int randNum;    if(start>255) start=255;    if(end>255) end=255;    if(start>end) randNum=start-end;    else randNum=end-start;    int r=start+rand.nextInt(randNum);    int g=start+rand.nextInt(randNum);    int b=start+rand.nextInt(randNum);    return new Color(r,g,b);   }         /**    * 着色\旋转\缩放    *     * @param word 文字    * @param g    图片对象    */   public void coloredAndRotation(String word,int i,Graphics g){    /**着色**/    g.setColor(new Color(20+rand.nextInt(110),20+rand.nextInt(110),20+rand.nextInt(110)));    /**旋转**/    Graphics2D g2d=(Graphics2D)g;    AffineTransform trans=new AffineTransform();    trans.rotate(rand.nextInt(45)*3.14/180,15*i+8,7);    /**缩放**/    float scaleSize=rand.nextFloat()+0.8f;    if(scaleSize>1f) scaleSize=1f;    trans.scale(scaleSize, scaleSize);    g2d.setTransform(trans);    g.drawString(word,15*i+20,20);   }      /**    * 生成100条干扰线    *     * @param g2d    * @param width    * @param height    */   public void getRandLine(Graphics2D g2d,int width,int height){    for(int i=0;i<100;i++){     int x=rand.nextInt(width-1);     int y=rand.nextInt(height-1);     int z=rand.nextInt(6)+1;     int w=rand.nextInt(12)+1;          BasicStroke bs=new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);     Line2D line=new Line2D.Double(x,y,x+z,y+w);     g2d.setStroke(bs);     g2d.draw(line);    }   }      /**    * 获取随机文字    *     * @param  length [int]        验证码长度    * @param  g      [Graphics]   图片对象    * @return String    * @case1:A-Z    * @case2:chinese    * @default:0-9    */   @SuppressWarnings("unused")   public String getRandWord(int length,Graphics g){    String finalWord="",firstWord="";    int tempInt=0;    String[] array={      "0","1","2","3",      "4","5","6","7",      "8","9","a","b",      "c","d","e","f"};        for(int i=0;i<length;i++){     switch(rand.nextInt(2)){      case 1:        tempInt=rand.nextInt(26)+65;        firstWord=String.valueOf((char)tempInt);        break;      /*case 2:        int r1,r2,r3,r4;        String strH,strL;//high&low        r1=rand.nextInt(3)+11; //前闭后开[11,14)        if(r1==13){         r2=rand.nextInt(7);        }else{         r2=rand.nextInt(16);        }                r3=rand.nextInt(6)+10;        if(r3==10){         r4=rand.nextInt(15)+1;        }else if(r3==15){         r4=rand.nextInt(15);        }else{         r4=rand.nextInt(16);        }                strH=array[r1]+array[r2];        strL=array[r3]+array[r4];                byte[] bytes=new byte[2];        bytes[0]=(byte)(Integer.parseInt(strH,16));        bytes[1]=(byte)(Integer.parseInt(strL,16));                firstWord=new String(bytes);        break;*/      default:        tempInt=rand.nextInt(10)+48;        firstWord=String.valueOf((char)tempInt);        break;     }     finalWord+=firstWord;     this.coloredAndRotation(firstWord,i, g);    }        return finalWord;   }     protected void service(HttpServletRequest request, HttpServletResponse response)     throws ServletException, IOException {        //设制不缓存图片    response.setHeader("Pragma","No-cache");    response.setHeader("Cache-Control","No-cache");    response.setDateHeader("Expires",0);        //生成图片    response.setContentType("image/jpeg");    int width=100;    int height=40;    BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);        Graphics g=image.getGraphics();    Graphics2D g2d=(Graphics2D)g;    Font mFont=new Font("宋体",Font.BOLD,22);    g.setColor(this.getRandColor(200,250));    g.fillRect(0, 0, width, height);    g.setFont(mFont);    g.setColor(this.getRandColor(180,200));        this.getRandLine(g2d, width, height);        String randCode=this.getRandWord(4, g);        HttpSession session=request.getSession();    session.setAttribute("randCode",MD5.code(randCode.toLowerCase()));        g.dispose();        ImageIO.write(image,"JPEG",response.getOutputStream());       }    }
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Java生成验证码的代码
