JAVA后台生成图形验证码

package com.seawave.bi.util;

import com.seawave.validateCodeImg.ImgFontByte;

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.Random;

/**
 * 验证码生成器
 * Created by 黄鹏祥 on 2016/11/7.
 */
public class ValidateCode {

    // 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 = 4;
    // 验证码干扰线数
    private int lineCount = 50;
    // 验证码
    private String code = null;
    // 验证码图片Buffer
    private BufferedImage buffImg = null;

    private final char[] codeSequence = {
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j',
            'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
            'x', 'y',
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J',
            'K', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
            'X', 'Y', '3', '4', '5', '6', '7', '8', '9'
    };
    private final int codeSequenceLength = codeSequence.length;

    public ValidateCode() {

    }

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

    /**
     * @param width     图片宽
     * @param height    图片高
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     */
    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);//每个字符的宽度
        fontHeight = height - 2;//字体的高度
        codeY = height - 4;

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();
        // 生成随机数
        Random random = new Random();
        // 将图像填充为白色
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);
        // 创建字体
        com.seawave.validateCodeImg.ImgFontByte imgFont = new ImgFontByte();
        Font font = imgFont.getFont(fontHeight);
        g.setFont(font);

        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width / 8);
            int ye = ys + random.nextInt(height / 8);
            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记录随机产生的验证码
        StringBuilder randomCode = new StringBuilder();
        // 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(codeSequenceLength)]);
            // 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);
            g.setColor(new Color(red, green, blue));
            g.drawString(strRand, (i + 1) * x, codeY);
            // 将产生的随机数组合在一起。
            randomCode.append(strRand);
        }
        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;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public void setCodeCount(int codeCount) {
        this.codeCount = codeCount;
    }

    public void setLineCount(int lineCount) {
        this.lineCount = lineCount;
    }

}

/**
     * 显示验证码图片
     *
     * @param response
     * @param session
     * @throws IOException
     */
    @RequestMapping(value = "/showValidateCodeImg")
    public void showValidateCodeImg(HttpServletResponse response, HttpSession session)
            throws IOException {
        // 设置响应的类型格式为图片格式
        response.setContentType("image/jpeg");
        // 禁止图像缓存。
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        ValidateCode vCode = new ValidateCode();
        vCode.setWidth(160);
        vCode.setHeight(35);
        vCode.setCodeCount(6);
        vCode.setLineCount(100);
        vCode.createCode();
        // 保存图形验证码
        session.setAttribute(SessionConstant.CERTIFICATION_SEND_SMS_IMG_CODE, vCode.getCode());
        ServletOutputStream outputStream = response.getOutputStream();
        vCode.write(outputStream);
    }

 
            
   
    请输入图形验证码  
    
     
    
    
     
    
     
  
        
 

$(function () {
    // 点击验证码图片可以更换图形验证码
    _imgCodeImg.click(function () {
        $(this).attr("src", "/certification/showValidateCodeImg?radom=" + Math.random());
    });
});