中文验证码，使用字体文件，不依赖操作系统字体

centos下没有所需的中文字体，所以图片画图中文都成了方框，

安装字体需要重启服务器，

其实，构造Font时指定字体文件就可以解决对操作系统的依赖

设<img src=c_vcode.jsp

c_vcode.jsp代码如下

<%@page import="com.anzhi.ucenter.utils.ComUtils"%>
<%@ page contentType="image/jpeg"
	import="java.io.*,java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"
	pageEncoding="utf-8"%>
<%! 
public static String  path=null;
public static Font font1=null; 
public static Font getFontOfPath(String path){
	try{
		java.io.FileInputStream fi = new java.io.FileInputStream(path);
		java.io.BufferedInputStream fb = new java.io.BufferedInputStream(fi);
		Font nf = Font.createFont(Font.TRUETYPE_FONT,fb);
		 
		return nf;
	}
	catch(Exception e){
		e.printStackTrace();
	}
	return null;
	
}
public static Font getFont1() { 
	if(font1==null){ 
		String fontPath=path+File.separator+"font"+File.separator+"SIMYOU.TTF";
		font1=getFontOfPath(fontPath); 
	}
	font1=font1.deriveFont(Font.BOLD,15 + random.nextInt(6)); 
	
	return font1;
	//return new Font("幼圆",Font.BOLD,15 + random .nextInt(6));
}
%>	
<%
	try {
		if(path==null){
			path=request.getRealPath(""); 
		} 
		//设置页面不缓存
		response.setHeader("P3P","CP=CAO PSA OUR");
		response.setHeader("Pragma","No-cache");
		response.setHeader("Cache-Control","no-cache");
		response.setDateHeader("Expires",0);
		int codeLength = 6;//验证码长度
		int mixTimes = 30;//模糊程度参数
		Color bfColor = new Color(0,0);//字体颜色
		boolean ifRandomColor = true;//单个字符是否颜色随机
		boolean ifMixColor = true;//模糊线是否颜色随机
		// 设置图片的长宽
		int width = 156,height = 30;
		//设置备选汉字，剔除一些不雅的汉字
		String base = "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";
		//备选汉字的长度
		int length = base.length();
		//创建内存图像
		BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
		// 获取图形上下文
		Graphics g = image.getGraphics();
		//创建随机类的实例
		Random random = new Random();
		// 设定图像背景色(因为是做背景，所以偏淡)
		g.setColor(getRandColor(100,250));
		g.fillRect(0,width,height);
		//备选字体
		 
	 
		//在图片背景上增加噪点
		g.setColor(getRandColor(140,200));
		g.setFont(new Font("Times New Roman",Font.PLAIN,14));
		for (int i = 0; i < mixTimes * codeLength / 10; i++) {
			if (ifMixColor) {
				g.setColor(getRandColor(100,200));
			}
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(width);
			int yl = random.nextInt(height);
			g.drawLine(x,y,x + xl,y + yl);
		}
		
		for (int i = 0; i < 6; i++) {
			g.drawString(
					"**----******```**-------````````...//*********...//*****------...//----............../////",5 * (i + 2));
		}
		//取随机产生的认证码(6个汉字)
		//保存生成的汉字字符串
		String sRand = "";
		for (int i = 0; i < 6; i++) {
			int start = random.nextInt(length);
			String rand = base.substring(start,start + 1);
			sRand += rand;
			//设置字体的颜色
			g.setColor(getRandColor(50,150));
			//设置字体
			g.setFont(getFont1());
			//将此汉字画到图片上
			g.drawString(rand,24 * i + 10 + random.nextInt(18),24);
		}
		String cookieName = "az_vcode";
		String cookieValue = null;
		Cookie[] cs = request.getCookies();
		if (cs != null) {
			for (Cookie c : cs) {
				if (cookieName.equals(c.getName())) {
					cookieValue = c.getValue();
					break;
				}
			}
		}
		if (cookieValue == null) {
			cookieValue = UUID.randomUUID().toString();
		}
		Cookie cookieKey = new Cookie(cookieName,cookieValue);
		cookieKey.setMaxAge(-1);
		//cookieKey.setDomain(Configuration.SSO_DOMAIN);
		cookieKey.setPath("/");
		response.addCookie(cookieKey);
		// 将认证码存入SESSION
		//session.setAttribute("validateCode",sRand);
		ComUtils.verificationCode(cookieValue,sRand);
		//System.out.println("vcode="+sRand);

		g.dispose();
		OutputStream os = response.getOutputStream();
		//输出图象到页面
		ImageIO.write(image,"PNG",os);
		out.clear();
		out = pageContext.pushBody();
	} catch (Exception e) {
		e.printStackTrace();
	}
%>
<%!//生成随机颜色
	//给定范围获得随机颜色
	private static Random random = new Random();

	private Color getRandColor(int fc,int bc) {
		return getRandColor(fc,bc,fc);
	}

	private Color getRandColor(int fc,int bc,int interval) {
		if (fc > 255) {
			fc = 255;
		}
		if (bc > 255) {
			bc = 255;
		}
		int r = fc + random.nextInt(bc - interval);
		int g = fc + random.nextInt(bc - interval);
		int b = fc + random.nextInt(bc - interval);
		return new Color(r,g,b);
	}%>

（编辑：李大同）

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