验证码功能

1.添加依赖

<dependency>
    <groupId>com.github.axet</groupId>
    <artifactId>kaptcha</artifactId>
    <version>0.0.9</version>
</dependency>

2.添加配置

在config包下创建一个kaptcha配置类，配置验证码的一些生成属性。代码：

import java.util.Properties;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;

@Configuration
public class KaptchaConfig {

    @Bean
    public DefaultKaptcha producer() {
        Properties properties=new Properties();
        properties.put("kaptercha.border", "no");
        properties.put("kaptercha.textproducer.font.color", "black");
        properties.put("kaptercha.textproducer.char.space", "5");
        Config config=new Config(properties);
        DefaultKaptcha defaultKaptcha=new DefaultKaptcha();
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
        
    }
}

3.生成代码

新建一个控制器，提供系统登陆相关的api，在其中添加生成验证码接口。代码：

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import com.louis.mango.common.utils.IOUtils;
@RestController
public class SysLoginController {

    @Autowired
    private Producer producer;
    
    @GetMapping("kaptcha.jpg")
    public void kaptcha(HttpServletResponse response,HttpServletRequest request) throws ServletException,IOException{
        response.setHeader("Cache-Control", "no-store,no-cache");
        response.setContentType("image/jpeg");
        //生成文字验证码
        String text=producer.createText();
        //生成图片验证码
        BufferedImage image=producer.createImage(text);
        //保存验证码到session
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, text);
        ServletOutputStream out=response.getOutputStream();
        ImageIO.write(image, "jpg", out);
        //用到IO工具包控制开关
        IOUtils.closeQuietly(out);
        
    }
    
}

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