package com;import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Iterator;import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.ImageIcon;import sun.misc.OSEnvironment;public class TopologyServlet extends HttpServlet { private static final long serialVersionUID = 1L; /**
* 计数器
*/
private static int count = 0;
/**
* 计算的周期 2s
*/
private static final int countPeriod = 2;
/**
* 图像宽度
*/
private static int WIDTH = 800;
/**
* 图像高度
*/
private static int HEIGHT = 400;
//@SuppressWarnings("unused")
private static boolean COLORFUL_LINK = false;
/**
* 设置图片的宽度
*
* @param w宽度的像素
*/
public void setWidth(int w) {
WIDTH = w;
} /**
* 设置图片的高度
*
* @param h高度的像素
*/
public void setHeight(int h) {
HEIGHT = h;
} /**
* 定时执行并生成图像缓存
*/
public static void OnTimer() { //ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
count ++;
//多少计算一次
if( !(count % countPeriod ==0) ) return;
try {
COLORFUL_LINK = false; BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics();
g.setColor(Color.WHITE);// 画框
g.fillRect(0, 0, WIDTH, HEIGHT);
g.setColor(Color.GRAY);// 画框
g.drawRect(0, 0, WIDTH-5, HEIGHT-5);
} catch (Exception e) {
// TODO: handle exception
}
}
}
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Iterator;import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.ImageIcon;import sun.misc.OSEnvironment;public class TopologyServlet extends HttpServlet { private static final long serialVersionUID = 1L; /**
* 计数器
*/
private static int count = 0;
/**
* 计算的周期 2s
*/
private static final int countPeriod = 2;
/**
* 图像宽度
*/
private static int WIDTH = 800;
/**
* 图像高度
*/
private static int HEIGHT = 400;
//@SuppressWarnings("unused")
private static boolean COLORFUL_LINK = false;
/**
* 设置图片的宽度
*
* @param w宽度的像素
*/
public void setWidth(int w) {
WIDTH = w;
} /**
* 设置图片的高度
*
* @param h高度的像素
*/
public void setHeight(int h) {
HEIGHT = h;
} /**
* 定时执行并生成图像缓存
*/
public static void OnTimer() { //ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
count ++;
//多少计算一次
if( !(count % countPeriod ==0) ) return;
try {
COLORFUL_LINK = false; BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics();
g.setColor(Color.WHITE);// 画框
g.fillRect(0, 0, WIDTH, HEIGHT);
g.setColor(Color.GRAY);// 画框
g.drawRect(0, 0, WIDTH-5, HEIGHT-5);
} catch (Exception e) {
// TODO: handle exception
}
}
}
package com.qhit;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;
import javax.servlet.http.HttpSession;import org.apache.log4j.Logger;public class ShowCode extends HttpServlet { /**
*
*/
private static final long serialVersionUID = 1L;
private static Logger log = Logger.getLogger(ShowCode.class);
// 设置图形验证码中的字符串的字体的大小 private Font mFont = new Font("Arial Black", Font.PLAIN, 16);
/**
* 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 { doPost(request,response);
} /**
* 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 { //生成服务器相应的service方法
//阻止生成的页面内容被缓存,保证每次重新生成随机验证码
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
//指定图形验证码图片的大小;
int width = 80;//宽度
int height = 20;//高度
BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB); //准备在图片中绘制内容
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor(200, 250));
g.fillRect(1, 1, width - 1, height - 1);
g.setColor(new Color(102, 102, 102));
g.drawRect(0, 0, width - 1, height - 1);
g.setFont(mFont); g.setColor(getRandColor(160, 200)); //生成随机线条
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width - 1);
int y = random.nextInt(height - 1);
int xl = random.nextInt(6) + 1;
int yl = random.nextInt(12) + 1;
g.drawLine(x, y, x + xl, y + yl);
} for (int i = 0; i < 70; i++) {
int x = random.nextInt(width - 1);
int y = random.nextInt(height - 1);
int xl = random.nextInt(12) + 1;
int yl = random.nextInt(6) + 1;
g.drawLine(x, y, x - xl, y - yl);
} String sRand = "";
//生成随机的字符串并加入到图片中
int LEN = 4; //控制随机码的长度
for (int i = 0; i < LEN; i++) {
String tmp = getRandomChar();
sRand += tmp;
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
g.drawString(tmp, 15 * i + 10, 15);
} HttpSession session = request.getSession(true); log.info("随机生成的字符串为"+sRand);
System.out.println("随机生成的字符串为"+sRand);
//将其自动转换为小写。也就是说用户在输入验证码的时候,不需要区分大小写,方便输入。
session.setAttribute("code", sRand.toLowerCase());
log.info("从session中取出来"+session.getAttribute("code"));
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
}
/**
* 生成随机颜色
* @param fc
* @param bc
* @return
*/ private Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b); }
/**
* 随机生成字符串
* @return
*/ private String getRandomChar() {
int rand = (int) Math.round(Math.random() * 2);
long itmp = 0;
char ctmp = '\u0000';
switch (rand) {
case 1:
itmp = Math.round(Math.random() * 25 + 65);
ctmp = (char) itmp;
return String.valueOf(ctmp);
case 2:
itmp = Math.round(Math.random() * 25 + 97);
ctmp = (char) itmp;
return String.valueOf(ctmp);
default:
itmp = Math.round(Math.random() * 9);
return String.valueOf(itmp);
}
}}