【文件属性】：
文件名称：.jsp和servlet验证码
文件大小：3KB
文件格式：7Z
更新时间：2015-01-26 05:41:04
jsp、servlet
package Cls;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
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 MyVerifyCode extends HttpServlet {
private static MyVerifyCode instance;
private final String ATTRIBUTE_NAME = "verifycode";
// ��֤���ַ�������
private final int CODE_LENGTH =4;
// ��֤��߶�����
private static final int Height =30;
// ������֤���Ƿ���Ҫ��תЧ��
private boolean ROTATE_FLAG = true;
//���������Ƿ���Ҫ���
private boolean FONT_FLAG=false;
//�����������Ĭ������
private String font="";
//��������Ĵ�С,Ĭ��Ϊ15
private int fontsize=15;
private final String RAND_RANGE = "abcdefhgkmnpqrstuvwxyz"
+ "ABCDEFGHGKLMNPQRSTUVWXYZ" + "2345678";
// private Random rand=new Random();
public static Random rand = new Random();
private final char[] CHARS = RAND_RANGE.toCharArray();
// ���캯��
public MyVerifyCode() {
}
public static MyVerifyCode getInstance() {
if (instance == null)
instance = new MyVerifyCode();
return instance;
}
// �������ַ�
private String getRandString() {
StringBuffer vcode = new StringBuffer();
for (int i = 0; i < CODE_LENGTH; i++)
vcode.append(CHARS[rand.nextInt(CHARS.length)]);
return vcode.toString();
}
// ���������
public static float getRandomJiao() {
float jiao = 0.0f;
if (rand.nextFloat()<=0.5) {
jiao = rand.nextFloat()-0.3f;
} else {
jiao = -rand.nextFloat()+0.3f;
}
return jiao;
}
// ��������ɫ
private Color getRandColor(int ll, int ul) {
if (ll > 255)
ll = 255;
if (ll < 1)
ll = 1;
if (ul > 255)
ul = 255;
if (ul < 1)
ul = 1;
if (ul == ll)
ul = ll + 1;
int r = rand.nextInt(ul - ll) + ll;
int g = rand.nextInt(ul - ll) + ll;
int b = rand.nextInt(ul - ll) + ll;
Color color = new Color(r, g, b);
return color;
}
private BufferedImage getImage(HttpServletRequest request) {
//根据设置的高度计算事宜的fontsize
int FontSize=Height*75/96;
//根据设置的字体及字的个数计算出适宜的宽度
int width = CODE_LENGTH * FontSize*4/5 + 10;
//根据字体大小设置X轴的位移量
int X_=FontSize/2;
BufferedImage image = new BufferedImage(width,Height,
BufferedImage.TYPE_INT_RGB);
// ��ȡͼ��������
Graphics graphics = image.getGraphics();
Graphics2D g2 = (Graphics2D) graphics;
g2.setColor(getRandColor(100, 255));
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, width, Height);
g2.translate(0, Height*2/3);
double oldrot = 0;
String vcode=this.getRandString();
// 把验证码存入session
request.getSession(true).setAttribute("codes", vcode);
for (int i = 0; i < CODE_LENGTH; i++) {
g2.setFont(new Font("Times New Roman", Font.HANGING_BASELINE, FontSize));
double rot = getRandomJiao();
// 旋转画笔
if (ROTATE_FLAG) {
g2.rotate(-oldrot);
g2.translate(X_+rand.nextInt(8), 0);
oldrot = rot;
g2.rotate(rot);
}
String temp = vcode.substring(i, i + 1);
g2.setColor(getRandColor(1, 100));
g2.drawString(temp, 0, 0);
}
// ͼ����Ч
g2.dispose();
return image;
}
public void printImage(HttpServletRequest request,
HttpServletResponse response) {
// ��ContentType��Ϊ"image/jpeg"���������ʶ��ͼ���ʽ��
response.setContentType("image/jpeg");
// ����ҳ�治����
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 2000);
// ��������֤��
String verifyCode = this.getRandString();
// �����֤���ͼ�����
BufferedImage bi = this.getImage(request);
try {
// ���Servlet�����
ServletOutputStream outStream = response.getOutputStream();
// ������������ͼ����ݱ���ΪJPEG������ı�����
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outStream);
// ��ͼ����ݽ��б���
encoder.encode(bi);
// ǿ�н���������������뵽ҳ��
outStream.flush();
// �ر������
outStream.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response) {
printImage(request, response);
}
}
【文件预览】：
20120106
----LoginCodes.jsp(4KB)
----LoginCode.jsp(4KB)
----RegistCode.jsp(4KB)
----MyVerifyCode.java(5KB)