SpringBoot集成Kaptcha验证码

---

一：依赖

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

二：Kaptcha实体属性类（注入Bean使用）

包名：net.i.xiangadmin.common.kaptcha

1. KaptchaColor.java

   package net.i.xiangadmin.common.kaptcha;
   
   import com.google.common.collect.Lists;
   
   import java.awt.*;
   import java.util.List;
   import java.util.Random;
   
   /**
    * [ 验证码颜色 ]
    *
    * @version 1.0
    * @since JDK1.8
    */
   public class KaptchaColor {
   
       public static Color getColor() {
   
           List<Color> colors = Lists.newArrayList();
           colors.add(new Color(0, 135, 255));
           colors.add(new Color(51, 153, 51));
           colors.add(new Color(255, 102, 102));
           colors.add(new Color(255, 153, 0));
           colors.add(new Color(153, 102, 0));
           colors.add(new Color(153, 102, 153));
           colors.add(new Color(51, 153, 153));
           colors.add(new Color(102, 102, 255));
           colors.add(new Color(0, 102, 204));
           colors.add(new Color(204, 51, 51));
           colors.add(new Color(128, 153, 65));
           Random random = new Random();
           int colorIndex = random.nextInt(10);
           return colors.get(colorIndex);
       }
   }
   

2. KaptchaNoise.java

   package net.i.xiangadmin.common.kaptcha;
   
   import com.google.code.kaptcha.NoiseProducer;
   import com.google.code.kaptcha.util.Configurable;
   
   import java.awt.*;
   import java.awt.image.BufferedImage;
   import java.util.Random;
   
   /**
    * [ 验证码加噪处理 ]
    *
    * @version 1.0
    * @since JDK1.8
    */
   public class KaptchaNoise extends Configurable implements NoiseProducer {
       public KaptchaNoise() {
       }
   
       @Override
       public void makeNoise(BufferedImage image, float factorOne, float factorTwo, float factorThree, float factorFour) {
   
           int width = image.getWidth();
           int height = image.getHeight();
           Graphics2D graph = (Graphics2D)image.getGraphics();
           graph.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));
           graph.setStroke(new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
           Random random = new Random();
           int noiseLineNum = random.nextInt(3);
           if(noiseLineNum == 0){
               noiseLineNum = 1;
           }
           for (int i = 0; i < noiseLineNum; i++){
               graph.setColor(KaptchaColor.getColor());
               graph.drawLine(random.nextInt(width), random.nextInt(height), 10 + random.nextInt(20), 10 + random.nextInt(20));
           }
   
           graph.dispose();
       }
   }
   
   

3. KaptchaWordRenderer.java

   package net.i.xiangadmin.common.kaptcha;
   
   import com.google.code.kaptcha.util.Configurable;
   
   import java.awt.*;
   import java.awt.font.FontRenderContext;
   import java.awt.font.GlyphVector;
   import java.awt.image.BufferedImage;
   import java.util.Random;
   
   /**
    * [ 验证码字体生成 ]
    *
    * @version 1.0
    * @since JDK1.8
    */
   public class KaptchaWordRenderer extends Configurable implements com.google.code.kaptcha.text.WordRenderer {
   
       public KaptchaWordRenderer() {
       }
   
       @Override
       public BufferedImage renderWord(String word, int width, int height) {
           int fontSize = this.getConfig().getTextProducerFontSize();
           Font[] fonts = this.getConfig().getTextProducerFonts(fontSize);
           int charSpace = this.getConfig().getTextProducerCharSpace();
           BufferedImage image = new BufferedImage(width, height, 2);
   
           Graphics2D g2D = image.createGraphics();
           g2D.setColor(Color.WHITE);
           RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
           hints.add(new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY));
           g2D.setRenderingHints(hints);
           g2D.setStroke(new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
   
           FontRenderContext frc = g2D.getFontRenderContext();
           Random random = new Random();
           int startPosY = (height - fontSize) / 5 + fontSize;
           char[] wordChars = word.toCharArray();
           Font[] chosenFonts = new Font[wordChars.length];
           int[] charWidths = new int[wordChars.length];
           int widthNeeded = 0;
   
           int startPosX;
           for(startPosX = 0; startPosX < wordChars.length; ++startPosX) {
               chosenFonts[startPosX] = fonts[random.nextInt(fonts.length)];
               char[] charToDraw = new char[]{wordChars[startPosX]};
               GlyphVector gv = chosenFonts[startPosX].createGlyphVector(frc, charToDraw);
               charWidths[startPosX] = (int)gv.getVisualBounds().getWidth();
               if (startPosX > 0) {
                   widthNeeded += 2;
               }
   
               widthNeeded += charWidths[startPosX];
           }
   
           startPosX = (width - widthNeeded) / 2;
   
           for(int i = 0; i < wordChars.length; ++i) {
               g2D.setColor(KaptchaColor.getColor());
               g2D.setFont(chosenFonts[i].deriveFont(Font.PLAIN));
               char[] charToDraw = new char[]{wordChars[i]};
               g2D.drawChars(charToDraw, 0, charToDraw.length, startPosX, startPosY);
               startPosX = startPosX + charWidths[i] + charSpace;
           }
   
           return image;
       }
   
   
   }
   

三：Kaptcha配置类，注入Bean

包名：net.i.xiangadmin.config

package net.i.xiangadmin.config;

import net.i.xiangadmin.common.kaptcha.KaptchaNoise;
import net.i.xiangadmin.common.kaptcha.KaptchaWordRenderer;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

/**
 * [ 验证码配置 ]
 *
 * @version 1.0
 * @since JDK1.8
 */
@Configuration
public class SmartKaptchaConfig {

    @Bean
    public DefaultKaptcha getDefaultKaptcha(){
        DefaultKaptcha defaultKaptcha=new DefaultKaptcha();
        Properties properties=new Properties();
        properties.setProperty("kaptcha.border", "no");
        properties.setProperty("kaptcha.border.color", "34,114,200");
        properties.setProperty("kaptcha.image.width", "125");
        properties.setProperty("kaptcha.image.height", "45");
        properties.setProperty("kaptcha.textproducer.char.string", "0123456789");
        properties.setProperty("kaptcha.textproducer.char.length", "4");
        properties.setProperty("kaptcha.textproducer.font.names", "Arial,Arial Narrow,Serif,Helvetica,Tahoma,Times New Roman,Verdana");
        properties.setProperty("kaptcha.textproducer.font.size", "38");

        properties.setProperty("kaptcha.background.clear.from", "white");
        properties.setProperty("kaptcha.background.clear.to", "white");

        properties.setProperty("kaptcha.word.impl", KaptchaWordRenderer.class.getName());
        properties.setProperty("kaptcha.noise.impl", KaptchaNoise.class.getName());

        Config config=new Config(properties);
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }

}

四：注入（Gitee）

@Autowired
private DefaultKaptcha defaultKaptcha;