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本文实例为大家分享了sp页面验证码的具体代码,供大家参考,具体内容如下
项目结构如下,MyEclipse中新建一个Web Project,取名servlet
1、src下new一个servlet类
package com.servlet; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.PrintWriter; import java.util.Random; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class IdentityServlet extends HttpServlet { public static final char[] chars={'2','3','4','5','6','7','8','9','A'};//自定义验证码池 public static Random random=new Random(); //随机数 public static String getRandomString(){ //获取6位随机数,放在图片里 StringBuffer buffer=new StringBuffer(); for(int i=0;i<6;i++){ buffer.append(chars[random.nextInt(chars.length)]); } return buffer.toString(); } public static Color getRandomColor(){ //获取随机的颜色 return new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)); } public static Color getReverseColor(Color c){ //返回某颜色的反色 return new Color(255 - c.getRed(), 255 - c.getGreen(), 255 - c.getBlue()); } /** * Constructor of the object. */ public IdentityServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("image/jpeg"); //设置输出类型 String randomString = getRandomString(); //随机字符串 request.getSession(true).setAttribute("randomString", randomString);//放到session里 int width=100; //图片宽度 int height=30; //图片高度 Color color=getRandomColor(); //随机颜色,用于背景色 Color reverse=getReverseColor(color);//反色,用于前景色 //创建一个彩色图片 BufferedImage bi=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g=bi.createGraphics(); //绘图对象 g.setFont(new Font(Font.SANS_SERIF,Font.BOLD,16));//设置字体 g.setColor(color);//设置颜色 g.fillRect(0, 0, width, height);//绘制背景 g.setColor(reverse); g.drawString(randomString, 18, 20);//绘制随机字符 for(int i=0,n=random.nextInt(100);i<n;i++){ //画最多100个噪音点 g.drawRect(random.nextInt(width), random.nextInt(height), 1, 1); } ServletOutputStream out= response.getOutputStream();//转成JPEG格式 JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(out);//编码器 encoder.encode(bi); //对图片进行编码 out.flush(); //输出到客户端 } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }
2、web.xml,会自动生成servlet和servlet-mapping的配置
<"1.0" encoding="UTF-8""3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <servlet> <servlet-name>IdentityServlet</servlet-name> <servlet-class>com.servlet.IdentityServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>IdentityServlet</servlet-name> <url-pattern>/servlet/IdentityServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
3、WebRoot下新建一个html,展示验证码
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript"> function reloadImage(){ document.getElementById('btn').disabled=true; document.getElementById('identity').src='servlet/IdentityServlet"servlet/IdentityServlet" id="identity" onload="btn.disabled=false;" /> <input type=button value="换个图片" onclick="reloadImage()" id="btn"> </body> </html>
启动Tomcat,输入网址:http://localhost:8080/servlet/identity.html,效果如下:
点击‘换个图片',会生成新的验证码。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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白云岛资源网 Design By www.pvray.com
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