package com.lf.testvity;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.Robot;

import java.awt.image.BufferedImage;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.security.auth.message.callback.PrivateKeyCallback.Request;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import javax.sound.midi.Patch;

import org.junit.Test;

public class Vitiry {

    //验证码字符的个数

    private static int count = 4;

    //干扰线的条数

    private static int lines = 2;

    /**

     * 随机产生颜色

     * @return 颜色

     */

    private static Color getRandomColor(){

        Random random = new Random();

        Color color = new Color(random.nextInt(255)+1, random.nextInt(255)+1, random.nextInt(255)+1);

        return color;

    }

    /**

     * 获取四个字符的字符串

     * @return 字符串

     */

    public static String getForthWord() {

        String string = "23456789abcdefghijkmnpqrstuvwxyz";

        StringBuilder newStr = new StringBuilder("");

        //随机获取count个数字，根据count个随机数产生字符串

        Random random = new Random();

        for (int i = 0; i < count; i++) {

            int ranNum=random.nextInt(string.length());

            newStr.append(string.charAt(ranNum));

        }

        String str = new String(newStr);

        return str;

    }

    /**

     * 绘画验证码

     * @return BufferedImage

     */

    public static BufferedImage productImage() {

        int width = 70;

        int height = 30;

        // 得到图片缓存区

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

        // 得到它的绘制环境（这张图片的笔）

        Graphics2D g2 = (Graphics2D)bi.getGraphics();

        // 设置颜色

        g2.setColor(Color.WHITE);

        // 填充整张图片(其实就是设置背景颜色)

        g2.fillRect(0, 0, width, height);

        // 设置字体

        g2.setFont(new Font("宋体", Font.BOLD, 25));

        //设置颜色

        g2.setColor(Vitiry.getRandomColor());

        // 向图片写字符串

        g2.drawString(Vitiry.getForthWord(), 7, 25);

        //画两条干扰线

        Random random = new Random();

        for (int i = 0; i < lines; i++) {

            g2.drawLine(2, random.nextInt(height-10)+10, width-5, random.nextInt(height));

        }

        return bi;

    }

}