1.首先看一下基本的流程
2.看一下代码
注：其中用到的一些工具类，可以到我的github上去下载
https://github.com/hjzgg/usually_util/tree/master/utils
windows 下的 redis下载
https://github.com/hjzgg/redis
获取验证码的tooken
@RequestMapping(value="loginCode")@ResponseBodypublic String getCode(){PrintWriter out = null;JSONObject jsono = new JSONObject();try {
//验证码工具类ValidateCode vCode = new ValidateCode(55,25,4,80);String randomCode = vCode.randomCode();String encCode = DesUtil.strEnc(randomCode+System.currentTimeMillis(), "1", "2", "3");//存储验证码字符串,过期时间为1分钟 redisTemplate.opsForValue().set(encCode, randomCode);redisTemplate.expire(encCode, 1, TimeUnit.MINUTES);//存储验证码生成器,过期时间为1分钟redisTemplate.opsForValue().set(encCode+"ValidateCode", SerializeUtil.serialize(vCode));redisTemplate.expire(encCode+"ValidateCode", 1, TimeUnit.MINUTES);jsono.put("success", true);jsono.put("message", encCode);} catch (Exception e) {e.printStackTrace();jsono.put("success", true);jsono.put("message", "inner error.");} finally{if(out != null) {out.flush();out.close();}}return jsono.toString();}
本例中的tooken是通过加密生成的，加密串为 验证码+当前时间。或者采用UUID生成唯一tooken，都是可以得。生成ValidateCode（验证码工具类），然后将键值对（tooken，ValidateCode）放入redis中。
获取验证码图片
@RequestMapping(value="loginCodeImage")public void getCodeImage(String codeAuth, HttpServletResponse response){if(codeAuth == null) return;String randomCode = (String) redisTemplate.opsForValue().get(codeAuth);if(randomCode == null) return;ValidateCode vCode = (ValidateCode)SerializeUtil.unserialize((byte[])redisTemplate.opsForValue().get(codeAuth+"ValidateCode"));//产生图片 vCode.createCode(randomCode);if(vCode == null) return;// 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); try {vCode.write(response.getOutputStream());} catch (IOException e) {e.printStackTrace();} }
根据tooken，在redis中找到对应的ValidateCode（验证码工具类），生成验证码图片。
3.前台获取验证码
网页中获取
<img src="htpp://......"/>
java中获取
public static ImageIcon getCodeImage(){String data = JavaRequest.sendPost("loginCode", null);JSONObject result = JSONObject.fromObject(data);if((Boolean) result.get("success")){JavaRequest.codeAuth = result.getString("message");ImageIcon codeImg = null;try{codeImg = new ImageIcon(new URL(“.....”));} catch (Exception e) {e.printStackTrace();return null;}return codeImg;} else {System.out.println("获取验证码图片: " + result);return null;}}ImageIcon codeImg = JavaRequest.getCodeImage();if(codeImg == null){codeImg = new ImageIcon("获取失败的图片.png");}
/
JLable codeImgLabel = new JLabel(codeImg);
)
