java实现验证码
java验证码的实现(一)
收藏
1.ImageServlet类的实现：
package com.mobile.control;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ImageServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
// 生成数字和字母的验证码
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
BufferedImage img = new BufferedImage(68, 22,
BufferedImage.TYPE_INT_RGB);
// 得到该图片的绘图对象
Graphics g = img.getGraphics();
Random r = new Random();
&
相关文档：
在Eclipse中连上javadocs文档
一、 安装Eclipse
二、 从Oracle官网或者sun以前的官网上下载Java相应的docs文档
三、 & ......
xml文件如下 配置功能开关
<Configurations>
<Samples>true</Samples>
<Excepts>true</Excepts>
<CheckFace>false</CheckFace>
<ThumbNail>false</ThumbNail>
&nbs ......
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet. ......
Jsp
方面
jsp的常用的命令答：page, include, talib, forward,
Servlet
方面
1
、说一说
Servlet
的生命周期
?
答:servlet有良好
的生存期的定义，包括加载和实例化、初始化、处理请求以及服务结束。这个生存期由javax.servlet.Servlet接口的
init,service和destroy方法表达。
2
、
Servlet
版本间
(
忘� ......
POIFSFileSystem fs=new POIFSFileSystem(new FileInputStream(cfname));
HSSFWorkbook wb = new HSSFWorkbook(fs);
......
