验证码问题

[明悟]

验证码在FF里显示很快，但是在IE里需要20秒左右才能显示
通过FF的Web控制台查看链接状态，响应很快，但加载很慢

--
[10:37:23.033] GET http://192.168.186.140:8080/ifengstar3/CodeServlet [HTTP/1.1 200 OK 21016ms]

这个要这么解决啊？
我找了好久都没发现问题在哪里

[ylovep]

楼主后台输出一下需要多少时间产生验证码

[明悟]

后台的输出时间为5毫秒左右

[INFO ] 2013-06-19 14:03:30,953 method:com.ifengstar.common.controller.MainPage.validateCode(MainPage.java:284)
生成验证码：null
java.util.Random@dd36f3
[INFO ] 2013-06-19 14:03:30,968 method:com.ifengstar.common.controller.MainPage.validateCode(MainPage.java:303)
验证码生成完成TPJB

[明悟]

顶一下，大神们都没法解决这个问题吗？

[明悟]

贴上代码：

package com.ifengstar.common.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;

import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
 * 验证码生成器
 * 
 * @author 
 * 
 */
public class ValidateCode {
	// 图片的宽度。
	private int width = 60;
	// 图片的高度。
	private int height = 20;
	// 验证码字符个数
	private int codeCount = 4;
	// 验证码干扰线数
	private int lineCount = 150;
	// 验证码
	private String code = null;
	// 验证码图片Buffer
	private BufferedImage buffImg = null;
	private HttpServletRequest request = null;

	private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
			'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
			'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

	public ValidateCode() throws ImageFormatException, IOException {
		this.createCode();
	}

	/**
	 * 
	 * @param width
	 *            图片宽
	 * @param height
	 *            图片高
	 * @throws IOException
	 * @throws ImageFormatException
	 */
	public ValidateCode(int width, int height) throws ImageFormatException,
			IOException {
		this.width = width;
		this.height = height;
		this.createCode();
	}

	/**
	 * 
	 * @param width
	 *            图片宽
	 * @param height
	 *            图片高
	 * @param codeCount
	 *            字符个数
	 * @param lineCount
	 *            干扰线条数
	 * @throws IOException
	 * @throws ImageFormatException
	 */
	public ValidateCode(int width, int height, int codeCount, int lineCount,
			HttpServletRequest request) throws ImageFormatException,
			IOException {
		this.width = width;
		this.height = height;
		this.codeCount = codeCount;
		this.lineCount = lineCount;
		this.request = request;
		this.createCode();
	}

	public void createCode() throws ImageFormatException, IOException {
		int x = 0, fontHeight = 0, codeY = 0;
		int red = 0, green = 0, blue = 0;

		x = width / (codeCount + 1);// 每个字符的宽度
		fontHeight = height - 2;// 字体的高度
		codeY = height - 4;

		// 图像buffer
		 buffImg = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
		/*String imageFile = request.getSession().getServletContext()
				.getRealPath("/images/pic.jpg");
		InputStream imageIn = new FileInputStream(new File(imageFile));
		JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(imageIn);
		buffImg = decoder.decodeAsBufferedImage();*/

		Graphics2D g = buffImg.createGraphics();
		// 生成随机数
		Random random = new Random();
		System.out.println(random);
		// 将图像填充为白色
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, width, height);
		// 画边框
		g.setColor(Color.BLACK);
		g.drawRect(0, 0, width - 1, height - 1);
		// 创建字体
		Font font;
		try {
			Font baseFont = Font.createFont(Font.TRUETYPE_FONT,
					new ByteArrayInputStream(hex2byte(getFontByteStr())));
			font = baseFont.deriveFont(Font.PLAIN, fontHeight);
		} catch (Exception e) {
			font = new Font("Arial", Font.PLAIN, fontHeight);
		}
		/*
		 * ImgFontByte imgFont=new ImgFontByte(); Font font
		 * =imgFont.getFont(fontHeight); g.setFont(font);
		 */
		g.setFont(font);

		g.setColor(getRandColor(160, 200));   

		for (int i = 0; i < lineCount; i++) {
			int xs = random.nextInt(width);
			int ys = random.nextInt(height);
			int xe = xs + random.nextInt(width / 8);
			int ye = ys + random.nextInt(height / 8);
			g.drawLine(xs, ys, xe, ye);
		}

		// randomCode记录随机产生的验证码
		StringBuffer randomCode = new StringBuffer();
		// 随机产生codeCount个字符的验证码。
		for (int i = 0; i < codeCount; i++) {
			String strRand = String.valueOf(codeSequence[random
					.nextInt(codeSequence.length)]);
			// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
			red = random.nextInt(255);
			green = random.nextInt(255);
			blue = random.nextInt(255);
			g.setColor(new Color(red, green, blue));
			g.drawString(strRand, (i*x + x/2), codeY);
			// 将产生的四个随机数组合在一起。
			randomCode.append(strRand);
		}
		// 将四位数字的验证码保存到Session中。
		code = randomCode.toString();
		g.dispose();
	}

	private byte[] hex2byte(String str) {
		if (str == null)
			return null;
		str = str.trim();
		int len = str.length();
		if (len == 0 || len % 2 == 1)
			return null;

		byte[] b = new byte[len / 2];
		try {
			for (int i = 0; i < str.length(); i += 2) {
				b[i / 2] = (byte) Integer
						.decode("0x" + str.substring(i, i + 2)).intValue();
			}
			return b;
		} catch (Exception e) {
			return null;
		}
	}

	private Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
		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);
	}

	/**
	 * ttf字体文件的十六进制字符串
	 * 
	 * @return
	 */
	private String getFontByteStr() {
		return null;
	}

	public void write(String path) throws IOException {
		OutputStream sos = new FileOutputStream(path);
		this.write(sos);
	}

	public void write(OutputStream sos) throws IOException {
		/*JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
		encoder.encode(buffImg);*/

		 ImageIO.write(buffImg, "jpeg", sos);
		 sos.close();
	}

	public BufferedImage getBuffImg() {
		return buffImg;
	}

	public String getCode() {
		return code;
	}
}

@RequestMapping(value = "/CodeServlet", method = RequestMethod.GET)
	public void validateCode(HttpServletRequest request, 
            @RequestParam(required = false, value = "temp") String temp,
			HttpServletResponse response,HttpSession session) {
		log.info("生成验证码："+temp);
		// 设置页面不缓存
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		response.setContentType("image/jpeg");
		ValidateCode vCode=null;
		try {
			vCode = new ValidateCode(width,height,4,100,request);
		} catch (ImageFormatException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}   
		session.setAttribute("validateCode", vCode.getCode());   
		try {
			vCode.write(response.getOutputStream());
			log.info("验证码生成完成"+vCode.getCode());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}   
	}

<img id="codeImg" src="CodeServlet" title="看不清？点击刷新" onclick="changeCode()" alt="验证码"/>

function changeCode(){
	$("#codeImg").removeAttr('src'); 
	$("#codeImg").attr("src",CodeServlet?temp="+Math.random());
}