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 {
}
}
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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>
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以上就是本文的全部内容，希望对大家的学习有所帮助。