Java图片验证码生成工具类

package cn.jq.myservlet.utils;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Random;

import javax.imageio.ImageIO;

public class VerificationCodeImgUtil {

	// 图片的宽度。
	private int width = 160;
	// 图片的高度。
	private int height = 40;
	// 验证码字符个数
	private int codeCount = 5;
	// 验证码干扰线数
	private int lineCount = 150;
	// 验证码Buffer图片对象
	private BufferedImage buffImg = null;
	// 验证码
	private String validateCode = null;

	// 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了)
	private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R',
			'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };

	/**
	 * 默认构造函数,设置默认参数
	 */
	public VerificationCodeImgUtil() {
		this.createCode();
	}

	/**
	 * @param width  图片宽
	 * @param height 图片高
	 */
	public VerificationCodeImgUtil(int width, int height) {
		this.width = width;
		this.height = height;
		this.createCode();
	}

	/**
	 * @param width     图片宽
	 * @param height    图片高
	 * @param codeCount 字符个数
	 * @param lineCount 干扰线条数
	 */
	public VerificationCodeImgUtil(int width, int height, int codeCount, int lineCount) {
		this.width = width;
		this.height = height;
		this.codeCount = codeCount;
		this.lineCount = lineCount;
		this.createCode();
	}

	public void createCode() {
		int x = 0, fontHeight = 0, codeY = 0;
		int red = 0, green = 0, blue = 0;

		x = width / (codeCount + 2);// 每个字符的宽度(左右各空出一个字符)
		fontHeight = height - 2;// 字体的高度
		codeY = height - 4;

		// 生成Buffer图片对象
		buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		// 获取Buffer图片对象的画笔
		Graphics2D graphic = buffImg.createGraphics();
		// 将图像填充为白色
		graphic.setColor(Color.WHITE);
		graphic.fillRect(0, 0, width, height);
		//画边框颜色
		graphic.setColor(Color.BLACK);
		graphic.drawRect(0, 0, width-1, height-1);
		// 创建字体,可以修改为其它的
		Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
		// Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);
		graphic.setFont(font);

		// 生成随机数
		Random random = new Random();
		for (int i = 0; i < lineCount; i++) {
			// 设置随机开始和结束坐标
			int xs = random.nextInt(width);// x坐标开始
			int ys = random.nextInt(height);// y坐标开始
			int xe = xs + random.nextInt(width / 8);// x坐标结束
			int ye = ys + random.nextInt(height / 8);// y坐标结束

			// 产生随机的颜色值,让输出的每个干扰线的颜色值都将不同。
			red = random.nextInt(255);
			green = random.nextInt(255);
			blue = random.nextInt(255);
			graphic.setColor(new Color(red, green, blue));
			graphic.drawLine(xs, ys, xe, ye);
		}

		// randomCode记录随机产生的验证码
		StringBuffer randomCode = new StringBuffer();
		// 随机产生codeCount个字符的验证码。
		for (int i = 0; i < codeCount; i++) {
			String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
			// 产生随机的颜色值,让输出的每个字符的颜色值都将不同。
			red = random.nextInt(255);
			green = random.nextInt(255);
			blue = random.nextInt(255);
			graphic.setColor(new Color(red, green, blue));
			graphic.drawString(strRand, (i + 1) * x, codeY);
			// 将产生的codeCount个随机验证码组合在一起。
			randomCode.append(strRand);
		}
		// 将c产生的codeCount个随机验证码以字符串输入。
		validateCode = randomCode.toString();
	}

	//以文件的形式
	public void write(String file) throws IOException {
		OutputStream sos = new FileOutputStream(file);
		this.write(sos);
	}

	//以输出流的形式
	public void write(OutputStream sos) throws IOException {
		ImageIO.write(buffImg, "png", sos);
		sos.close();
	}
	
	public void write(OutputStream sos, String imyType) throws IOException {
		ImageIO.write(buffImg, imyType, sos);
		sos.close();
	}

	//获取产生的codeCount个随机验证码
	public String getValidateCode() {
		return validateCode;
	}

	/**
	 * 测试函数
	 */
	public static void main(String[] args) {
		VerificationCodeImgUtil vCode = new VerificationCodeImgUtil(160, 40, 5, 150);
		try {
			String file = "E:" + File.separator + "mySourceFile" + File.separator + new Date().getTime() + ".png";
			vCode.write(file);
			System.out.println(vCode.getValidateCode() + " >" + file);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}


}

    ETSPR >E:\mySourceFile\1545637133743.png

    

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转载自blog.csdn.net/qq_42402854/article/details/85234297