11.用户模块：验证码程序

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注册时需要填写验证码，填写正确才能注册。

1、生成验证码的action，CheckImgAction

package cn.xdy.shop.user.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.imageio.ImageIO;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class CheckImgAction extends ActionSupport{

	@Override
	public String execute() throws Exception {
		int width = 120;
		int height = 30;

		// 步骤一 绘制一张内存中图片
		BufferedImage bufferedImage = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);

		// 步骤二 图片绘制背景颜色 ---通过绘图对象
		Graphics graphics = bufferedImage.getGraphics();// 得到画图对象 --- 画笔
		// 绘制任何图形之前 都必须指定一个颜色
		graphics.setColor(getRandColor(200, 250));
		graphics.fillRect(0, 0, width, height);

		// 步骤三 绘制边框
		graphics.setColor(Color.WHITE);
		graphics.drawRect(0, 0, width - 1, height - 1);

		// 步骤四 四个随机数字
		Graphics2D graphics2d = (Graphics2D) graphics;
		// 设置输出字体
		graphics2d.setFont(new Font("宋体", Font.BOLD, 18));
		
		String words ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
		Random random = new Random();// 生成随机数
		// 定义StringBuffer 
		StringBuffer sb = new StringBuffer();
		// 定义x坐标
		int x = 10;
		for (int i = 0; i < 4; i++) {
			// 随机颜色
			graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			// 旋转 -30 --- 30度
			int jiaodu = random.nextInt(60) - 30;
			// 换算弧度
			double theta = jiaodu * Math.PI / 180;

			// 生成一个随机数字
			int index = random.nextInt(words.length()); // 生成随机数 0 到 length - 1
			// 获得字母数字
			char c = words.charAt(index);
			sb.append(c);
			// 将c 输出到图片
			graphics2d.rotate(theta, x, 20);
			graphics2d.drawString(String.valueOf(c), x, 20);
			graphics2d.rotate(-theta, x, 20);
			x += 30;
		}

		// 将生成的字母存入到session中
		ServletActionContext.getRequest().getSession().setAttribute("checkcode", sb.toString());

		// 步骤五 绘制干扰线
		graphics.setColor(getRandColor(160, 200));
		int x1;
		int x2;
		int y1;
		int y2;
		for (int i = 0; i < 30; i++) {
			x1 = random.nextInt(width);
			x2 = random.nextInt(12);
			y1 = random.nextInt(height);
			y2 = random.nextInt(12);
			graphics.drawLine(x1, y1, x1 + x2, x2 + y2);
		}

		// 将上面图片输出到浏览器 ImageIO
		graphics.dispose();// 释放资源
		ImageIO.write(bufferedImage, "jpg", ServletActionContext.getResponse().getOutputStream());
		return NONE;
	}
	
	/**
	 * 取其某一范围的color
	 * 
	 * @param fc
	 *            int 范围参数1
	 * @param bc
	 *            int 范围参数2
	 * @return Color
	 */
	private Color getRandColor(int fc, int bc) {
		// 取其随机颜色
		Random random = new Random();
		if (fc > 255) {
			fc = 255;
		}
		if (bc > 255) {
			bc = 255;
		}
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}

<!-- 验证码 -->
    	<action name="checkImg" class="checkImgAction">
    		
    	</action>

<!-- 验证码的action -->
	<bean id="checkImgAction" class="cn.xdy.shop.user.action.CheckImgAction" scope="prototype">
		
	</bean>

<span class="fieldSet">
											<input type="text" id="checkcode" name="checkcode" class="text captcha" maxlength="4" autocomplete="off">
											<img id="checkImg" class="captchaImage" src="${pageContext.request.contextPath}/checkImg" onclick="changeImg();" title="点击更换验证码">
										</span>

//切换验证码图片
	function changeImg(){
		var img = document.getElementById("checkImg");
		img.src="${pageContext.request.contextPath}/checkImg?"+new Date().getTime();
	}

5.1、在UserAction中加入checkcode，提供set方法，用以接收页面传过来的验证码字符串。

private String checkcode;//接收页面传入的验证码
	
	public void setCheckcode(String checkcode) {
		this.checkcode = checkcode;
	}

/**
	 * 注册
	 * @return
	 */
	public String regist(){
		//判断验证码与图片上验证码是否一致
		if(!checkcode.equalsIgnoreCase((String) ServletActionContext.getRequest().getSession().getAttribute("checkcode"))){
			addActionError("验证码错误！");
			return "registPage";
		}
		userService.save(user);
		MailUtil.sendMail(user.getEmail(), user.getCode());
		this.addActionMessage("注册成功！");
		return "msg";
	}

<span class="actionerrsor"><s:actionerror/></span>

.actionerrsor{
	color:red;
	font-weight:bold;
	font:"微软雅黑";
}

11.用户模块：验证码程序

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原文地址：http://blog.csdn.net/xiongwt/article/details/45288121