JAVA生成验证吗jsp接收配合strut2实现

package com.form.comm.util;

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

import javax.imageio.ImageIO;
/**
* 验证码生成器
* @author dsna
*
*/
public class ValidateCode {
// 图片的宽度。
private int width = 160;
// 图片的高度。
private int height = 40;
// 验证码字符个数
private int codeCount = 5;
// 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 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() {
this.createCode();
}

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

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

x = width / (codeCount +2);//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);
Graphics2D g = buffImg.createGraphics();
// 生成随机数
Random random = new Random();
// 将图像填充为白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
// 创建字体
ImgFontByte imgFont=new ImgFontByte();
Font font =imgFont.getFont(fontHeight);
g.setFont(font);

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);
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
g.setColor(new Color(red, green, blue));
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 + 1) * x, 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();
}

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

public void write(OutputStream sos) throws IOException {
ImageIO.write(buffImg, "png", sos);
sos.close();
}
public BufferedImage getBuffImg() {
return buffImg;
}

public String getCode() {
return code;
}
}

package com.form.comm.util;

import java.io.ByteArrayInputStream;
import java.awt.*;
/**
* ttf字体文件
* @author dsna
*
*/
public class ImgFontByte {
public Font getFont(int fontHeight){
try {
Font baseFont = Font.createFont(Font.TRUETYPE_FONT, new ByteArrayInputStream(hex2byte(getFontByteStr())));
return baseFont.deriveFont(Font.PLAIN, fontHeight);
} catch (Exception e) {
return new Font("Arial",Font.PLAIN, fontHeight);
}
}

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

return null;
//  return str;//字符串太长 在附件中找
}
}

<action name="download_code" class="pAction" method="DownLoad_code">
<result name="DownLoad_code" type="chain">download</result>
</action>

public void DownLoad_code() throws Exception {
HttpServletRequest request = ServletActionContext.getRequest();
String path = request.getParameter("path");

try {
// 设置响应的类型格式为图片格式
response.setContentType("image/jpeg");
//禁止图像缓存。
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);

HttpSession session = request.getSession();

ValidateCode vCode = new ValidateCode(120,40,5,100);
session.setAttribute("code", vCode.getCode());
vCode.write(response.getOutputStream());
}catch (Exception e) {
e.printStackTrace();
}
}

<div class="download-btn">
<div style="font-family: arial; margin-left: 14px">
File Type: <span class="info">    PDF</span><br />
Pages    :    <span class="info">254
Pages </span><br /> Size       : <span class="info">
    2M</span><br />
</div>
<form action="#">
<input type="text" id="input1" style="width:90px;margin-bottom:20px"/>
<img src="<%=path%>/download_code" alt="验证码" id="authCode" onclick="changeImg()">
<a href="#" onclick="changeImg()">看不清，换一张！</a>
</form>
<a class="down"  onclick="validate('${ pdf_url }');"  href="javascript:void(0)">DOWNLOAD</a>
</div>
</div>
</div>
</div>
<div style="clear:both"></div>
<!-- single-wrap -->
</div>
<!-- single-container -->
<%@ include file="common/footer.jsp"%>

<script type="text/javascript">
function changeImg(){
$("#authCode").attr("src","<%=path%>/download_code?d="+new Date().valueOf());
}
</script>