import java.awt.color;import java.awt.font;import java.io.ioexception;import java.io.outputstream;import java.util.arraylist;import java.util.list; import javax.imageio.imageio;import javax.servlet.servlet;import javax.servlet.servletexception;import javax.servlet.http.httpservlet;import javax.servlet.http.httpservletrequest;import javax.servlet.http.httpservletresponse; import org.apache.commons.lang.math.randomutils; import nl.captcha.captcha;import nl.captcha.captcha.builder;import nl.captcha.gimpy.blockgimpyrenderer;import nl.captcha.text.producer.chinesetextproducer;import nl.captcha.text.producer.defaulttextproducer;import nl.captcha.text.renderer.defaultwordrenderer;import nl.captcha.text.renderer.wordrenderer; public class captchaservlet extends httpservlet implements servlet { private static final long serialversionuid = 1l; private static final string param_height = height; // 高度 默认为50 private static final string param_width = width;// 宽度 默认为200 private static final string paeam_noise = noise;// 干扰线条 默认是没有干扰线条 private static final string paeam_text = text;// 文本 protected int _width = 150; protected int _height = 40; protected boolean _noise = false; protected string _text = number:1,word:1,number:1,number:1,word:1; /** * 初始化过滤器.将配置文件的参数文件赋值 * * @throws servletexception */ @override public void init() throws servletexception { if (getinitparameter(param_height) != null) { _height = integer.valueof(getinitparameter(param_height)); } if (getinitparameter(param_width) != null) { _width = integer.valueof(getinitparameter(param_width)); } if (getinitparameter(paeam_noise) != null) { _noise = boolean.valueof(getinitparameter(paeam_noise)); } if (getinitparameter(paeam_noise) != null) { _text = string.valueof(getinitparameter(paeam_text)); } } /** * 因为获取图片只会有get方法 */ @override public void doget(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception { builder builder = new captcha.builder(_width, _height); // 增加边框 // builder.addborder(); // 是否增加干扰线条 if (_noise == true) { builder.addnoise(); } // ----------------自定义字体大小----------- // 自定义设置字体颜色和大小 最简单的效果 多种字体随机显示 list fontlist = new arraylist(); fontlist.add(new font(微软 雅黑, font.layout_no_start_context, 30));// 可以设置斜体之类的 defaultwordrenderer dwr = new defaultwordrenderer(getrandomcolor(), fontlist); // 加入多种颜色后会随机显示 字体空心 wordrenderer wr = dwr; // 增加文本，默认为5个随机字符. if (_text == null) { builder.addtext(); } else { string[] ts = _text.split(,); for (int i = 0; i