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package Action;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import java.awt.*;
import com.sun.image.codec.jpeg.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.swing.*;
import java.math.*;
public class CodeServlet
extends HttpServlet {
//Process the HTTP Get request
//更多资源请访问飞飞Asp技术乐园 www.ffasp.com
//本例来源：http://ffasp.com/content.asp?newsid=1105飞飞Asp技术乐,园
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType(request.getContentType());
response.setContentType("image/jpeg"); //必须设置ContentType为image/jpeg
int length = 4; //设置默认生成4个数字
Date d = new Date();
long lseed = d.getTime();
java.util.Random r = new Random(lseed); //设置随机种子
if (request.getParameter("length") != null) {
try {
length = Integer.parseInt(request.getParameter("length"));
}
catch (NumberFormatException e) {
}
}
StringBuffer str = new StringBuffer();
for (int i = 0; i < length; i++) {
str.append(r.nextInt(9)); //生成随机数字
}
//可以在此加入保存验证码的代码
//创建内存图像
BufferedImage bi = new BufferedImage(40, 16, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
g.clearRect(0, 0, 16, 40);
g.setColor(Color.RED);
g.drawString(str.toString(), 4, 12);
try {
//使用JPEG编码，输出到response的输出流
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(response.
getOutputStream());
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
param.setQuality(1.0f, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(bi);
}
catch (Exception ex) {
}
}
}
//更多资源请访问飞飞Asp技术乐园 www.ffasp.com
//本例来源：http://ffasp.com/content.asp?newsid=1105飞飞，Asp技术乐园