验证码的实现

前台代码

</div>

public class StrUtils {

/**
* <pre>
* 获取N位随机数
* @param length
* @return
* </pre>
*/
public static String getRandom(int length) {

Random random = new Random();
String result="";
for(int i=0; i<length; i++){
result+=random.nextInt(10);
}
return result;
}

/**
* <pre>
* 获取验证码工具类
* patchca 是一个简单但功能强大的验证码的Java类库
* @author assassin
* @date 2017.6.2
* </pre>
*/
public class VerifyCode {

private ConfigurableCaptchaService captchaService = new ConfigurableCaptchaService();
private ThreadLocal<String> captchaLocal = new ThreadLocal<String>();

//初始化及配置验证码参数
public VerifyCode(String code) {

this.captchaLocal.set(code);

//
this.captchaService.setBackgroundFactory(new SingleColorBackgroundFactory(Color.WHITE));
this.captchaService.setColorFactory(new SingleColorFactory(Color.BLUE));
this.captchaService.setFilterFactory(new WobbleRippleFilterFactory());
this.captchaService.setWidth(90);
this.captchaService.setHeight(28);
this.captchaService.setFontFactory(new RandomFontFactory(20, new String[] { "Thoma", "Serif" }));
this.captchaService.setWordFactory(new WordFactory() {
public String getNextWord() {
return captchaLocal.get();
}
});

}

//获取验证码图片流
public BufferedImage getImage() {
return this.captchaService.getCaptcha().getImage();
}

//输出图片
public static void output(BufferedImage image, OutputStream out)
throws IOException {
ImageIO.write(image, "png", out);
}

}

控制器的编写

//生成验证码
@RequestMapping("/verifyCode")
public void verifyCode(HttpServletRequest request,HttpServletResponse response) throws Exception{
//获取4个随机数
String code = StrUtils.getRandom(4);

VerifyCode verifyCode = new VerifyCode(code);
//获取图片
BufferedImage bufferedImage = verifyCode.getImage();
//把四个随机数放入到session中去
request.getSession().setAttribute("code", code);
//输出图片给客户端
VerifyCode.output(bufferedImage, response.getOutputStream());

}

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