注意的一些点。
1.引入kaptcha的maven配置 引入验证码包
3.修改src的返回属性返回base64(理由是让验证码的显示要调用ajax返回,ajax的返回类型dataType只有xml,html,script,json,jsonp,text,没有 resp.setContentType("image/jpeg“)图片类型,所以要用ajax读取图片,只能用base64位返回数据)
4.读取配置文件来设置验证码是否要用
5.生成验证码和token来跟前台当前用户确定,如果不用token无法却该验证码是哪个用户发送过来的
6.生成token放到redis里面之前确认是否还有token,如果该token已经生成就不再使用,重新生成
(1).pom.xml文件引用,这里没有引用原版google的,因为仓库里面没有
<dependency>
<groupId>com.github.penggle</groupId>
<artifactId>kaptcha</artifactId>
<version>2.3.2</version>
</dependency>
(2).定义生成验证码
<!-- google kaptcha的相关配置-->
<bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
<property name="config">
<bean class="com.google.code.kaptcha.util.Config">
<constructor-arg>
<props>
<!-- 是否有边框 可选yes 或者 no -->
<prop key="kaptcha.border">yes</prop>
<!-- 边框颜色 -->
<prop key="kaptcha.border.color">105,179,90</prop>
<!-- 验证码文本字符颜色 -->
<prop key="kaptcha.textproducer.font.color">blue</prop>
<!-- 验证码文本字符大小 -->
<prop key="kaptcha.textproducer.font.size">45</prop>
<!-- 验证码图片的宽度 默认200 -->
<prop key="kaptcha.image.width">125</prop>
<!-- 验证码图片的高度 默认50 -->
<prop key="kaptcha.image.height">50</prop>
<!-- 验证码文本字符长度 默认为5 -->
<prop key="kaptcha.textproducer.char.length">4</prop>
<!-- 验证码文本字体样式 默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize) -->
<prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
</props>
</constructor-arg>
</bean>
</property>
</bean>
(3).编写springmvc的controller (ResponseBody是为了返回数据能直接给ajax用)
package com.csair.fwms.airlog.controller.sub;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import sun.misc.BASE64Encoder;
@Controller
@RequestMapping("captcha")
public class CaptchaController {
@Resource
private Producer captchaProducer;
@Autowired
private RedisTemplate<String, String> redisTemplate;
/**
*
* 获取验证码图片
* @author ccg
* @param request
* @param response
* @return
* @throws IOException
* Created 2017年1月17日 下午5:07:28
*/
@RequestMapping("getCaptchaCode")
@ResponseBody
public Object getCaptchaCode(HttpServletRequest request, HttpServletResponse response) throws IOException{
//生成验证码文本
String capText = captchaProducer.createText();
System.out.println("生成验证码文本===="+capText);
//利用生成的字符串构建图片
BufferedImage bi = captchaProducer.createImage(capText);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(bi, "jpg", out);
BASE64Encoder encoder = new BASE64Encoder();
String base64Img = encoder.encode(out.toByteArray());
response.setContentType("application/json");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setCharacterEncoding("UTF-8");
String context = request.getContextPath();
String token = RandomStringUtils.randomAlphanumeric(20);
while (!StringUtils.isEmpty(redisTemplate.opsForValue().get(token))) {//redis里面如果有这个token就继续生成新的token,要生成一个没用过的token
System.out.println("----------------------");
System.out.println("新的token");
token = RandomStringUtils.randomAlphanumeric(20);
}
redisTemplate.opsForValue().set(token, capText);//token和验证码对应的放到redis里面
Cookie vtokenCookie = new Cookie("vtoken", token);//把token放入到页面里去
vtokenCookie.setMaxAge(60 * 30);
vtokenCookie.setPath(context);
response.addCookie(vtokenCookie);
return base64Img;
}
}
(4).获取配置文件属性
package com.csair.fwms.airlog.basic.util;
import java.io.IOException;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;
import org.springframework.core.io.support.PropertiesLoaderUtils;
/**
*
* @ClassName: TestProperties
* @Description: 获取配置文件信息
* @date: 2017年11月25日 上午10:56:00
* @version: 1.0.0
*/
public class PropertiesUtil{
public static String getValue(String key){
Properties properties = new Properties();
// 使用InPutStream流读取properties文件
BufferedReader bufferedReader;
try {
bufferedReader = new BufferedReader(new FileReader("src/main/resources/web.properties"));
properties.load(bufferedReader);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 获取key对应的value值
String keys= properties.getProperty(key);
return keys;
}
}
(5).页面和登陆的时候验证
String vcode =PropertiesUtil.getValue("verificationCode");
if(vcode.equals("1")||vcode=="1"){//是否开启验证码
if (StringUtils.isEmpty(loginParam.getVtoken())) {//验证码过期
throw new ServiceException("验证码错误!");
}
String code = redisTemplate.opsForValue().get(loginParam.getVtoken());
if (!code.equals(loginParam.getCaptcha())) {//验证码是否正确
throw new ServiceException("验证码错误!");
}
}
(6).登陆页面
$.ajax({
type: "post",
contentType: "application/json; charset=utf-8",
dataType: "text",
url: "../captcha/getCaptchaCode",
success: function(data) {
$("#imgCaptcha").attr('src', "data:image/jpeg;base64,"+data);
},
error: function(e) {
console.log(e);
}
});
jQuery('#loginBtn').click(function() {
var vtoken = $.cookie('vtoken');
var post = {
account: form['account'].value,
password: form['password'].value,
captcha: form['captcha'].value,
vtoken: vtoken
};
$.ajax({
type: "post",
contentType: "application/json; charset=utf-8",
dataType: "json",
url: "../webapi/auth/login",
data: JSON.stringify(post),
success: function(data) {
if (!data.success) {
alert(data.exceptionMessage);
return;
}
window.location = '../webapi/home/index'
},
error: function(e) {
console.log(e);
}
});
});
// $('body').delegate('[name="loginBtn"]', 'click', function() {
// });
});
验证码文本框<img src="" width="112" height="42" id="imgCaptcha" style="margin-bottom: -3px"/>
登陆失败后要刷新页面
$.ajax({
type: "post",
contentType: "application/json; charset=utf-8",
dataType: "json",
url: "../webapi/auth/login",
data: JSON.stringify(post),
success: function(data) {
if (!data.success) {
alert(data.exceptionMessage);
$.ajax({
type: "post",
contentType: "application/json; charset=utf-8",
dataType: "text",
url: "../captcha/getCaptchaCode",
success: function(data) {
$("#imgCaptcha").attr('src', "data:image/jpeg;base64,"+data);
},
error: function(e) {
console.log(e);
}
});
return;
}
window.location = '../webapi/home/index'
},
error: function(e) {
console.log(e);
}
});
}