等比例缩放页面小工具

有这样一个需求，需要将一个页面等比例缩放，适应不同分辨率下的展示效果。
例如：在800×600下显示的某div的宽度是100px；在1024×768下div的宽度要200px。

原来的html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        .hh {
            font-size: 18px;
            width: 100px;
            background-color: #f0f;
        }
        </style>
</head>
<body>
    <div>
        <span style="font-size: 12px;">哈哈</span>
        <div class="hh">
            呵呵
        </div>
    </div>
</body>
</html>

放大2倍后的html

<!DOCTYPE html>
<html lang="en">

  <head>
    <meta charset="UTF-8" />
    <title></title>
    <style>
    .hh { 
        font-size: 36px;
         width: 200px;
         background-color: #f0f; 
     }
    </style>
    </head>

  <body>
    <div>
      <span style="font-size: 24px;">哈哈</span>
      <div class="hh">呵呵</div></div>
  </body>

</html>

java工具类

package mysqlTest;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;



public class Reversor2 {
    public static String[] LENGTH_UNIT = {"pt", "px"};



    public static void main(String[] args) {
        try {  
            String pathname = "D:\\www\\static\\zxd.html"; 
            File filename = new File(pathname);  
            InputStreamReader reader = new InputStreamReader(  
                    new FileInputStream(filename), "utf-8");  
            BufferedReader br = new BufferedReader(reader);

            StringBuilder res = new StringBuilder();
            String line = "";  

            while ((line = br.readLine()) != null) {  
                if (line != null && !line.equals("")) {
                    res.append(line);
                }
            }  
            br.close();

            String html = dealWithLine(res.toString(), 2); //放大2倍
            File writename = new File("D:\\www\\zx\\zx-1.html"); // 相对路径，如果没有则要建立一个新的output。txt文件  
            writename.createNewFile(); // 创建新文件  
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(writename),"utf-8"));  
            out.write(html);  
            out.flush(); // 把缓存区内容压入文件  
            out.close(); // 最后记得关闭文件  



        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  

    public static String dealWithLine(String str, float scale) {
        char[] cs = str.toCharArray();
        StringBuilder sb = new StringBuilder();

        boolean isChecking = false;
        String checkBox = "";
        int len = cs.length;
        for (int i = 0; i < len; i++) {
            char c = cs[i];
            if ((c >= 48 && c <= 57) || c == 46) {
                isChecking = true;
                checkBox += c;
            } else {
                if (isChecking && i < len-1) {
                    for (String unit : LENGTH_UNIT) {
                        if ((c + "" + cs[i+unit.length()-1]).equals(unit)) {
                            checkBox = subZeroAndDot((Float.parseFloat(checkBox) * scale) + "");
                        }  
                    }
                }
                sb.append(checkBox += c);
                checkBox = "";
                isChecking =  false;

            }

        }
        sb.append(checkBox);

        return sb.toString();
    }


    /** 
     * 使用java正则表达式去掉多余的.与0 
     * @param s 
     * @return  
     */  
    public static String subZeroAndDot(String s){  
        if(s.indexOf(".") > 0){  
            s = s.replaceAll("0+?$", "");//去掉多余的0  
            s = s.replaceAll("[.]$", "");//如最后一位是.则去掉  
        }  
        return s;  
    } 

}