package com.bstek.bdf2.core.controller;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.util.Properties;
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import javax.imageio.ImageIO;
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import javax.servlet.ServletException;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.commons.lang.StringUtils;
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import com.google.code.kaptcha.Constants;
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import com.google.code.kaptcha.Producer;
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import com.google.code.kaptcha.impl.DefaultKaptcha;
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import com.google.code.kaptcha.util.Config;
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import org.apache.commons.lang.math.RandomUtils;
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/**
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* @author Jacky.gao
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* @since 2013-2-21
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*/
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public class CaptchaController implements IController {
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private int defaultWidth = 165;
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private int defaultHeight = 57;
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private String defaultSessionKey = Constants.KAPTCHA_SESSION_KEY;
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private String url;
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public CaptchaController() {
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}
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public CaptchaController(String url) {
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this.url = url;
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}
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@Override
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public String getUrl() {
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return url;
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}
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@Override
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public void execute(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
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response.setDateHeader("Expires", 0);
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// Set standard HTTP/1.1 no-cache headers.
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response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
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// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
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response.addHeader("Cache-Control", "post-check=0, pre-check=0");
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// Set standard HTTP/1.0 no-cache header.
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response.setHeader("Pragma", "no-cache");
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// return a jpeg
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response.setContentType("image/jpeg");
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int width = defaultWidth;
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int height = defaultHeight;
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String key = defaultSessionKey;
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if (StringUtils.isNotEmpty(request.getParameter("key"))) {
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key = request.getParameter("key");
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}
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Producer captchaProducer = this.getProducer(width, height);
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String capText = captchaProducer.createText();
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request.getSession().setAttribute(key, capText);
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// create the image with the text
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BufferedImage bi = captchaProducer.createImage(capText);
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ServletOutputStream out = response.getOutputStream();
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try {
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// write the data out
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ImageIO.write(bi, "jpg", out);
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out.flush();
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} finally {
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out.close();
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}
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}
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@Override
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public boolean anonymousAccess() {
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return true;
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}
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private Producer getProducer(int width, int height) {
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DefaultKaptcha kaptcha = new DefaultKaptcha();
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Properties prop = new Properties();
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prop.put(Constants.KAPTCHA_IMAGE_WIDTH, String.valueOf(width));
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prop.put(Constants.KAPTCHA_IMAGE_HEIGHT, String.valueOf(height));
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prop.put(Constants.KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "4");
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prop.put(Constants.KAPTCHA_TEXTPRODUCER_CHAR_SPACE, "6");
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// prop.put(Constants.KAPTCHA_BACKGROUND_CLR_FROM, String.valueOf(RandomUtils.nextInt(255)) + ","
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// + RandomUtils.nextInt(255) + "," + RandomUtils.nextInt(255));
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//
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// prop.put(Constants.KAPTCHA_BACKGROUND_CLR_TO, String.valueOf(RandomUtils.nextInt(255)) + ","
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// + RandomUtils.nextInt(255) + "," + RandomUtils.nextInt(255));
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prop.put(Constants.KAPTCHA_NOISE_COLOR, String.valueOf(RandomUtils.nextInt(255)) + ","
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+ RandomUtils.nextInt(255) + "," + RandomUtils.nextInt(255));
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prop.put(Constants.KAPTCHA_TEXTPRODUCER_FONT_COLOR, String.valueOf(RandomUtils.nextInt(255)) + ","
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+ RandomUtils.nextInt(255) + "," + RandomUtils.nextInt(255));
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prop.put(Constants.KAPTCHA_TEXTPRODUCER_CHAR_STRING, "1234567890");
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prop.put(Constants.KAPTCHA_TEXTPRODUCER_FONT_NAMES,"Arial");
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Config config = new Config(prop);
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kaptcha.setConfig(config);
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return kaptcha;
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}
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@Override
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public boolean isDisabled() {
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return false;
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}
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}
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