package com.hx.util;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.Base64;
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import javax.imageio.ImageIO;
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/**
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* 验证码生成器
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* @author ChenJiaHe
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* @Date 2020-06-17
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*/
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public class CheckCodeImageUtil {
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private final static int WIDTH = 60;
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private final static int HEIGHT = 20;
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private static char[] generateCheckCode() {
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// ������֤����ַ��
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String chars = "123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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char[] rands = new char[4];
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for (int i = 0; i < 4; i++) {
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int rand = (int) (Math.random() * 35);
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rands[i] = chars.charAt(rand);
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}
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return rands;
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}
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private static void drawRands(Graphics g, char[] rands) {
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g.setColor(Color.BLACK);
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g.setFont(new Font(null, Font.ITALIC | Font.BOLD, 18));
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// �ڲ�ͬ�ĸ߶��������֤���ÿ���ַ�
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g.drawString("" + rands[0], 1, 17);
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g.drawString("" + rands[1], 16, 15);
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g.drawString("" + rands[2], 31, 18);
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g.drawString("" + rands[3], 46, 16);
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}
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private static void drawBackground(Graphics g) {
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// ������
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g.setColor(new Color(0xDCDCDC));
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g.fillRect(0, 0, WIDTH, HEIGHT);
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// ������120�����ŵ�
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for (int i = 0; i < 120; i++) {
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int x = (int) (Math.random() * WIDTH);
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int y = (int) (Math.random() * HEIGHT);
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int red = (int) (Math.random() * 255);
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int green = (int) (Math.random() * 255);
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int blue = (int) (Math.random() * 255);
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g.setColor(new Color(red, green, blue));
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g.drawOval(x, y, 1, 0);
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}
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}
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public static String[] createImage(String id)
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{
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ByteArrayOutputStream bos = null;
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String reStr = "";
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char[] rands = null;
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try {
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BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
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Graphics g = image.getGraphics();
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rands = generateCheckCode();
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drawBackground(g);
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drawRands(g, rands);
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g.dispose();
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bos = new ByteArrayOutputStream();
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ImageIO.write(image, "JPEG", bos);
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byte[] buf = bos.toByteArray();
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reStr = Base64.getEncoder().encodeToString(buf);
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}catch (Exception e) {
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e.printStackTrace();
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}finally {
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if(bos != null)
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{
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try {
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bos.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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bos = null;
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}
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}
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return new String[] {new String(rands),reStr};
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}
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}
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