java验证码工具kaptcha

说明

首先，文章是参考刺猬的温驯的。很是感谢提供这么使用式例。

1.下载jar

    maven形式，其余方式自行下载

<dependency>
			<groupId>com.github.penggle</groupId>
			<artifactId>kaptcha</artifactId>
			<version>2.3.2</version>
		</dependency>

2.在spring中配置been

    这里注意一下，不是springMvc的配置文件中

<!-- kaptcha 验证码 -->
	<bean class="com.google.code.kaptcha.impl.DefaultKaptcha">
		<property name="config">
			<bean class="com.google.code.kaptcha.util.Config">
				<constructor-arg>
					<props>
						<prop key="kaptcha.border">no</prop>
						<prop key="kaptcha.border.color">105,179,90</prop>
						<prop key="kaptcha.textproducer.font.color">red</prop>
						<prop key="kaptcha.image.width">150</prop>
						<prop key="kaptcha.textproducer.font.size">55</prop>
						<prop key="kaptcha.image.height">55</prop>
						<prop key="kaptcha.session.key">kaptchaCode</prop>
						<prop key="kaptcha.textproducer.char.length">4</prop>
						<prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
					</props>
				</constructor-arg>
			</bean>
		</property>
	</bean>

3.注入并使用

import java.awt.image.BufferedImage;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

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

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

@Controller
public class KaptchaCon {

	@Resource
	Producer producer;

	@RequestMapping("login/img")
	public void handleRequest(HttpSession session, HttpServletResponse response)
			throws Exception {

		response.setDateHeader("Expires", 0);
		response.setHeader("Cache-Control",
				"no-store, no-cache, must-revalidate");
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		response.setHeader("Pragma", "no-cache");
		response.setContentType("image/jpeg");
		String capText = producer.createText();
		// store the text in the session
		session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
		// create the image with the text
		BufferedImage bi = producer.createImage(capText);
		ServletOutputStream out = response.getOutputStream();
		// write the data out
		ImageIO.write(bi, "jpg", out);
		try {
			out.flush();
		} finally {
			out.close();
		}
	}
}

4.页面使用

<img 
src="${request.contextPath}/login/img" 
width="100%"
height="100%" 
id="kaptchaImage" />

5.点击变化

$(function() {
			$('#kaptchaImage').click(
					function() {
						$(this).attr(
							'src',
							'${request.contextPath}/login/img?'
									+ new Date().getTime());
					})
		});

6.结束

    关于配置问题，仍是继续寻找资料看看吧！