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java实用验证码的实现代码

转载 作者：qq735679552 更新时间：2022-09-29 22:32:09 24 4
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这篇CFSDN的博客文章java实用验证码的实现代码由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

本文为大家分享了java实用验证码的实现代码，供大家参考，具体内容如下 。

1、ValidCode      。

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package validImg;
 
import java.awt.Color;
import java.io.IOException;
import java.util.Random;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.github.bingoohuang.patchca.color.ColorFactory;
import com.github.bingoohuang.patchca.custom.ConfigurableCaptchaService;
import com.github.bingoohuang.patchca.filter.predefined.CurvesRippleFilterFactory;
import com.github.bingoohuang.patchca.filter.predefined.DiffuseRippleFilterFactory;
import com.github.bingoohuang.patchca.filter.predefined.DoubleRippleFilterFactory;
import com.github.bingoohuang.patchca.filter.predefined.MarbleRippleFilterFactory;
import com.github.bingoohuang.patchca.filter.predefined.WobbleRippleFilterFactory;
import com.github.bingoohuang.patchca.utils.encoder.EncoderHelper;
import com.github.bingoohuang.patchca.word.RandomWordFactory;
 
public class ValidCode extends HttpServlet {
   private static ConfigurableCaptchaService cs = new ConfigurableCaptchaService();
   private static Random random = new Random();
   static {
//    cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170)));
  
     cs.setColorFactory( new ColorFactory() {
       @Override
       public Color getColor( int x) {
         int [] c = new int [ 3 ];
         int i = random.nextInt(c.length);
         for ( int fi = 0 ; fi < c.length; fi++) {
           if (fi == i) {
             c[fi] = random.nextInt( 71 );
           } else {
             c[fi] = random.nextInt( 256 );
           }
         }
         return new Color(c[ 0 ], c[ 1 ], c[ 2 ]);
       }
     });
     RandomWordFactory wf = new RandomWordFactory();
     wf.setCharacters( "23456789abcdefghigkmnpqrstuvwxyzABCDEFGHIGKLMNPQRSTUVWXYZ" );
     wf.setMaxLength( 4 );
     wf.setMinLength( 4 );
     cs.setWordFactory(wf);
   }
 
 
   public void doGet(HttpServletRequest request, HttpServletResponse response)
       throws ServletException, IOException {
 
     switch (random.nextInt( 5 )) {
     case 0 :
       cs.setFilterFactory( new CurvesRippleFilterFactory(cs
           .getColorFactory()));
       break ;
     case 1 :
       cs.setFilterFactory( new MarbleRippleFilterFactory());
       break ;
     case 2 :
       cs.setFilterFactory( new DoubleRippleFilterFactory());
       break ;
     case 3 :
       cs.setFilterFactory( new WobbleRippleFilterFactory());
       break ;
     case 4 :
       cs.setFilterFactory( new DiffuseRippleFilterFactory());
       break ;
     }
     HttpSession session = request.getSession( false );
     if (session == null ) {
       session = request.getSession();
     }
     setResponseHeaders(response);
     String token = EncoderHelper.getChallangeAndWriteImage(cs, "png" ,
         response.getOutputStream());
     session.setAttribute( "validCode" , token);
     System.out.println( "当前的SessionID=" + session.getId() + "，验证码= ," + token);
 
   }
 
   protected void setResponseHeaders(HttpServletResponse response) {
     response.setContentType( "image/png" );
     response.setHeader( "Cache-Control" , "no-cache, no-store" );
     response.setHeader( "Pragma" , "no-cache" );
     long time = System.currentTimeMillis();
     response.setDateHeader( "Last-Modified" , time);
     response.setDateHeader( "Date" , time);
     response.setDateHeader( "Expires" , time);
   }
 
   public void doPost(HttpServletRequest request, HttpServletResponse response)
       throws ServletException, IOException {
 
   }
 
 
}

2.XML代码 。

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< dependency >
   < groupId >com.github.bingoohuang</ groupId >
   < artifactId >patchca</ artifactId >
   < version >0.0.1</ version >
  </ dependency >
 
< servlet >
  < servlet-name >ValidCode</ servlet-name >
  < servlet-class >validImg.ValidCode</ servlet-class >
</ servlet >
< servlet-mapping >
  < servlet-name >ValidCode</ servlet-name >
  < url-pattern >/validImg.jpg</ url-pattern >
</ servlet-mapping >

以上就是本文的全部内容，希望对大家的学习有所帮助.

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