java圖形驗證碼生成工具類

ValidateCode.java驗證碼

package com.demo.util;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Random;

/**
 * 驗證碼生成器 *
 * @author 
 */
public class ValidateCode {
    // 圖檔的寬度。
    private int width = 160;
    // 圖檔的高度。
    private int height = 40;
    // 驗證碼字元個數
    private int codeCount = 5;
    // 驗證碼幹擾線數
    private int lineCount = 150;
    // 驗證碼
    private String code = null;
    // 驗證碼圖檔Buffer
    private BufferedImage buffImg = null;

    // 驗證碼範圍,去掉0(數字)和O(拼音)容易混淆的(小寫的1和L也可以去掉,大寫不用了)
    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', '1', '2', '3', '4', '5', '6', '7', '8', '9'};

    /**
     * 預設構造函數,設定預設參數
     */
    public ValidateCode() {
        this.createCode();
    }

    /**
     * @param width  圖檔寬
     * @param height 圖檔高
     */
    public ValidateCode(int width, int height) {
        this.width = width;
        this.height = height;
        this.createCode();
    }

    /**
     * @param width     圖檔寬
     * @param height    圖檔高
     * @param codeCount 字元個數
     * @param lineCount 幹擾線條數
     */
    public ValidateCode(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);//每個字元的寬度(左右各空出一個字元)
        fontHeight = height - 2;//字型的高度
        codeY = height - 4;

        // 圖像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();
        // 生成随機數
        Random random = new Random();
        // 将圖像填充為白色
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);
        // 建立字型,可以修改為其它的
        Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
//        Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);
        g.setFont(font);

        for (int i = 0; i < lineCount; i++) {
            // 設定随機開始和結束坐标
            int xs = random.nextInt(width);//x坐标開始
            int ys = random.nextInt(height);//y坐标開始
            int xe = xs + random.nextInt(width / 8);//x坐标結束
            int ye = ys + random.nextInt(height / 8);//y坐标結束

            // 産生随機的顔色值，讓輸出的每個幹擾線的顔色值都将不同。
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawLine(xs, ys, xe, ye);
        }

        // randomCode記錄随機産生的驗證碼
        StringBuffer randomCode = new StringBuffer();
        // 随機産生codeCount個字元的驗證碼。
        for (int i = 0; i < codeCount; i++) {
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
            // 産生随機的顔色值，讓輸出的每個字元的顔色值都将不同。
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawString(strRand, (i + 1) * x, codeY);
            // 将産生的四個随機數組合在一起。
            randomCode.append(strRand);
        }
        // 将四位數字的驗證碼儲存到Session中。
        code = randomCode.toString();
    }

    public void write(String path) throws IOException {
        OutputStream sos = new FileOutputStream(path);
        this.write(sos);
    }

    public void write(OutputStream sos) throws IOException {
        ImageIO.write(buffImg, "png", sos);
        sos.close();
    }

    public BufferedImage getBuffImg() {
        return buffImg;
    }

    public String getCode() {
        return code;
    }

    /**
     * 測試函數,預設生成到d盤
     * @param args
     */
    public static void main(String[] args) {
        ValidateCode vCode = new ValidateCode(160,40,5,150);
        try {
            String path="D:/"+new Date().getTime()+".png";
            System.out.println(vCode.getCode()+" >"+path);
            vCode.write(path);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
           

轉載部落格：http://blog.csdn.net/zhulin40/article/details/51899487