package com.free.util;



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.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;



public class CodeMakerServlet extends HttpServlet

{

      /**

	 * 

	 */

	private static final long serialVersionUID = 1L;

	

	//生成随机类

    Random random = new Random();

    

	//验证码字体

    private Font[] codeFont =

    {

        new Font("Times New Roman", Font.PLAIN,18), 

        new Font("Times New Roman", Font.PLAIN, 18),

        new Font("Times New Roman", Font.PLAIN,18),

        new Font("Times New Roman", Font.PLAIN, 18)

    };

    //验证码数字颜色

    private Color[] color =

    {

       Color.BLACK, Color.RED, Color.DARK_GRAY, Color.BLUE

    };



    String codeNumbers = "";



    int width = 60, height = 20;



    // 处理 HTTP get 请求

    public void doGet(HttpServletRequest request, HttpServletResponse response)

                      throws ServletException, IOException

    {

    	System.out.println("生成验证码");

        // 清空缓冲区

        response.reset();



        // 注意这里的MIME类型

        response.setContentType("image/png");



        // 设置页面不缓存

        response.setHeader("Pragma", "No-cache");

        response.setHeader("Cache-Control", "no-cache");

        response.setDateHeader("Expires", 0);



        // 创建一个图像,验证码显示的图片大小

        BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);



  &