Java 图片随机数字字母验证码

生成验证码工具类：ValidateCode.java

package com.singlee.util;

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

import javax.imageio.ImageIO;

/**
 * 验证码生成器
 * 
 */
public class ValidateCode {
	// 图片的宽度。
	private int width = 80;
	// 图片的高度。
	private int height = 35;
	// 验证码字符个数
	private int codeCount = 4;
	// 验证码干扰线数
	private int lineCount = 100;
	// 验证码
	private String code = null;
	// 验证码图片Buffer
	private BufferedImage buffImg = null;

	private char[] codeSequence = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
			.toCharArray();

	public ValidateCode() {
		this.createCode();
	}

	/**
	 * 
	 * @param width
	 *            图片宽
	 * @param height
	 *            图片高
	 */
	public ValidateCode(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 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 fontwidth = width / (codeCount+2);// 每个字符的宽度
		int fontHeight = height - 4;// 字体的高度
		int codeY = height - 8;

		// 图像buffer
		buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		Graphics2D g = buffImg.createGraphics();

		// 将图像填充为白色
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, width, height);
		// 创建字体
		Font font = new Font("Arial", Font.PLAIN, fontHeight);
		g.setFont(font);
		// 生成随机数
		Random random = new Random();
		// 绘制干扰线
		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);
			// 随机颜色
			g.setColor(getRandomColor());
			g.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。
			g.setColor(getRandomColor());
			g.drawString(strRand, (i + 1) * fontwidth, codeY);
			// 将产生的四个随机数组合在一起。
			randomCode.append(strRand);
		}
		// 将四位数字的验证码保存到Session中。
		code = randomCode.toString();
	}

	/**
	 * 获取一个随机的颜色
	 * 
	 * @return
	 */
	private Color getRandomColor() {
		Random random = new Random();
		int r = random.nextInt(255);
		int g = random.nextInt(255);
		int b = random.nextInt(255);
		Color c = new Color(r, g, b);
		return c;
	}

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

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

	/**
	 * 获取图片BufferedImage
	 * 
	 * @return
	 */
	public BufferedImage getBuffImg() {
		return buffImg;
	}

	/**
	 * 获取验证码字符串
	 * 
	 * @return
	 */
	public String getCode() {
		return code;
	}
}

 

处理验证码请求的控制层：ValidateCodeController.java

package com.singlee.controller;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.singlee.controller.common.BaseController;
import com.singlee.model.common.ComException;
import com.singlee.util.ValidateCode;

/**
 * 验证码
 * 
 * @author Ming
 * 
 */
@Controller
@RequestMapping("/validatecode")
public class ValidateCodeController extends BaseController {

	@RequestMapping("randomcode")
	public void randomCode(HttpServletRequest req, HttpServletResponse resp)
			throws ComException {
		// 设置响应的类型格式为图片格式
		resp.setContentType("image/jpeg");
		// 禁止图像缓存。
		resp.setHeader("Pragma", "no-cache");
		resp.setHeader("Cache-Control", "no-cache");
		resp.setDateHeader("Expires", 0);
		HttpSession session = req.getSession();
		ValidateCode vCode = new ValidateCode(80, 35, 4, 70);
		System.out.println("code:" + vCode.getCode());
		//验证码保存到Session
		session.setAttribute("code", vCode.getCode());
		try {
			vCode.write(resp.getOutputStream());
		} catch (IOException e) {
			e.printStackTrace();
			throw new ComException("输出验证码图片异常："+e.getMessage());
		}
	}
}

 

页面显示：login.jsp

<div id="checkCodePanel" class="row">
					<label id="f_checkCode" class="field"
						style="visibility: visible;color: #999"> 请输入右侧验证码 </label> 
					<img class="checkImg" id='checkImg'
						src="<%=basePath%>validatecode/randomcode" /> 
					<input name="checkCode" class="text_checkcode" type="text" 
						id="checkCode" size="6" />
				</div>

 

点击刷新验证码：login.js

// 单击验证码刷新
$('#checkImg').click(function() {
	$('#checkImg').attr('src', 'validatecode/randomcode?d=' + Math.random());
});