java验证码制作

来源：互联网发布：淘宝阶层有什么用编辑：程序博客网时间：2024/06/04 19:30

//第一个类

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

public class Validatenumber {

private static final String CODE_LIST = "1234567890";
private HttpServletResponse response = null;
private static final int HEIGHT = 20;
private static final int FONT_NUM = 4;
private int width = 0;
private int iNum = 0;
private String codeList = "";
private boolean drawBgFlag = false;
private int rBg = 0;
private int gBg = 0;
private int bBg = 0;
public Validatenumber(HttpServletResponse response)
{
  this.response = response;
  this.width = 13 * FONT_NUM + 12;
  this.iNum = FONT_NUM;
  this.codeList = CODE_LIST;
  }
public Validatenumber(HttpServletResponse response,int iNum,String codeList)
{
  this.response = response;
this.width = 13 * iNum + 12;
this.iNum = iNum;
this.codeList = codeList;
}
public String createRandImage()
{
  BufferedImage image = new BufferedImage(width, HEIGHT,BufferedImage.TYPE_INT_RGB);
  Graphics g = image.getGraphics();
  Random random = new Random();
  if ( drawBgFlag )
  {
   g.setColor(new Color(rBg,gBg,bBg));
   g.fillRect(0, 0, width, HEIGHT);
   }
  else
  {
   g.setColor(getRandColor(200, 250));
   g.fillRect(0, 0, width, HEIGHT);
   for (int i = 0; i < 155; i++)
   {
    g.setColor(getRandColor(140, 200));
    int x = random.nextInt(width);
    int y = random.nextInt(HEIGHT);
    int xl = random.nextInt(12);
    int yl = random.nextInt(12);
    g.drawLine(x, y, x + xl, y + yl);
    }
   }
  g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
  String sRand="";
  for (int i=0;i<iNum;i++)
  {
   int rand=random.nextInt(codeList.length());
   String strRand=codeList.substring(rand,rand+1);
   sRand+=strRand;
   g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
   g.drawString(strRand,13*i+6,16);
   }
  g.dispose();
  try{
   ImageIO.write(image, "JPEG", response.getOutputStream());
   }
  catch(IOException e)
  {

  }
  return sRand;
  }
public void setBgColor(int r,int g,int b)
{
  drawBgFlag = true;
  this.rBg = r;
  this.gBg = g;
  this.bBg = b;
  }
private Color getRandColor(int fc, int bc)
{
  Random random = new Random();
  if (fc > 255)
   fc = 255;
  if (bc > 255)
   bc = 255;
  int r = fc + random.nextInt(bc - fc);
  int g = fc + random.nextInt(bc - fc);
  int b = fc + random.nextInt(bc - fc);
  return new Color(r, g, b);
}
//验证

}

//第二个类

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
/*** @author SinNeR@blueidea.com * create a image*/

public class Validateimg
{    public static void main(String[] args)
{
   BufferedImage image = new BufferedImage(130, 40,BufferedImage.TYPE_INT_RGB);
   Graphics g = image.getGraphics();
   g.setColor(new Color(255,255,255));
   g.fillRect(0, 0, 130, 40);
   g.setColor(new Color(0,0,0));
   g.drawString("HelloImage",6,16);
   g.dispose();
   try
   {
    ImageIO.write(image, "jpeg", new File("C://helloImage.jpeg"));
   }
   catch(IOException e)
   {
    e.printStackTrace();

   }
}
}

//jsp文件。获取图片
<%@ page contentType="image/jpeg" import="cn.forum.biz.*" %>
<%
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
Validatenumber rc = new Validatenumber(response);
//RandImgCreater rc = new RandImgCreater(response,8,"abcdef");
//rc.setBgColor(100,100,100);
String rand = rc.createRandImage();
session.setAttribute("rand",rand);
out.clear();
out = pageContext.pushBody();
%>

//比较验证码输入正确或者不正确 JSP

Userlogininfo us=new Userlogininfo();
Validatelogin vali=new Validatelogin();
Userexecutelogin login=new Userexecutelogin();
request.setCharacterEncoding("GBK");
response.setCharacterEncoding("GBK");
String code = (String)session.getAttribute("rand");
String inputCode = request.getParameter("txtvalidate");