阿拉伯数字转换为中文汉字

记得实习面试时，面试官提到过将数字转换为中文汉字显示，当时的回答现在想起来颇有漏洞，所以现在将该程序完善，来纪念下出入职场的自己：

package andycpp;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 
 * @author yifan
 *
 */
public class ChangeAtoC {

   private static Map<Integer, String> map =null;
	static {
		
		map = new HashMap<Integer, String>();
		map.put(0, "零");
		map.put(1, "一");
		map.put(2, "二");
		map.put(3, "三");
		map.put(4, "四");
		map.put(5, "五");
		map.put(6, "六");
		map.put(7, "七");
		map.put(8, "八");
		map.put(9, "九");	
	}
	
	public static void main(String[] args) throws Exception {
			
		/*****以下为字符输入部分*****/
		byte[] a = new byte[1024];
		String str = null;
		String head= null;
		int size = 0;
		while (true) {
			int read = 0;
			try {
				read = System.in.read();

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

			a[size++] = (byte) read;
			// 为换行时
			if (read == 10) {
				str = new String(a, 0, size);
				break;
			}
		}
		/*****输入完成，进行格式校验*****/
		Pattern p = Pattern.compile("\\d+\\.\\d+");
		Matcher mt = p.matcher(str);
		StringBuffer sb = new StringBuffer();
		if (mt.find()) {
			String[] strs = mt.group().split("\\.");
			int ints = Integer.parseInt(strs[0]);
			if (ints == 0) {
				head = "零";
			} else {
				for (int i = 1; ints != 0;) {
					sb.append(map.get(ints % 10));
					unitChinese(sb, i);
					ints /= 10;
					i++;
				}
				// 细节处理
				head = sb.reverse().substring(1, sb.length());
				if (head.endsWith("零")) {
					head = head.substring(0, head.length() - 1);
				}
				head = replaceZero("零十", head);

				head = replaceZero("零百", head);

				head = replaceZero("零千", head);

				head = replaceZero("零万", head);

				while (head.startsWith("一十")) {
					head = head.substring(1, head.length());
				}
				System.out.println(head);

			} 
			String end =strs[1];
			sb =new StringBuffer();
			for (int i = 0; i < end.length(); i++) {	 
				 sb.append(map.get(Integer.parseInt(end.substring(i,i+1))));
			}
			//合并
			System.out.println(head+"点"+sb.toString());
			
		} else {
			throw new Exception("字符输入不合法");
		}

	}
   //去掉语法中的零千、零万、零十、零百
	private static String replaceZero(String str, String head) {
		while(head.lastIndexOf(str)!=-1){
		     head =	head.replace(str, "");
		}
		return head;
	}

	private static void unitChinese(StringBuffer sb, int i) {
		if(i==1){
			 sb.append("十");
		 }else if(i==2){
			 sb.append("百");
		 }else if(i==3){
			 sb.append("千");
		 }else if(i==4){
			 sb.append("万");
		 }else if(i==5){
			 sb.append("十");
		 }else if(i==6){
			 sb.append("百");
		 }else if(i==7){
			 sb.append("千");
		 }else if(i==8){
			 sb.append("亿");
		 }
	}

}
           

这个程序只能支持亿位和亿位一下包括两位小数的转换，如果要支持更大数据量，需要细调下程序，程序本身还不算完美，应该还会有很多需要优化，或者可以更改的地方，欢迎大家指出