实用工具类Tool

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

public class Tool {

	private static final String UNIT = "万千佰拾亿千佰拾万千佰拾元角分";
	private static final String DIGIT = "零壹贰叁肆伍陆柒捌玖";
	private static final double MAX_VALUE = 9999999999999.99D;
	
	public static String inputStream2String(InputStream in) throws IOException {
		StringBuffer out = new StringBuffer();
		byte[] b = new byte[1024];
		int n;
		while ((n = in.read(b)) != -1) {
			out.append(new String(b, 0, n));
		}
		return out.toString();
	}

	public static void copyStream(InputStream in, OutputStream out) throws IOException {
		byte[] chunk = new byte[1024];
		int count;
		while ((count = in.read(chunk)) != -1) {
			out.write(chunk, 0, count);
		}
	}

	public static String replaceContent(String value, Map<String, Object> tokens) {
		
		String patternString = "\\$\\{(" + StringUtils.join(tokens.keySet(), "|") + ")\\}";
		
		Pattern pattern = Pattern.compile(patternString);
		Matcher matcher = pattern.matcher(value);

		StringBuffer sb = new StringBuffer();
		while (matcher.find()) {
			Object val = tokens.get(matcher.group(1));
			matcher.appendReplacement(sb, val == null ? "" : val.toString());
		}
		matcher.appendTail(sb);

		return sb.toString();
	}

	public static void closeStream(Closeable stream) {
		if (stream != null) {
			try {
				stream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public static String num2Word(double v) {
		if (v < 0 || v > MAX_VALUE) {
			throw new BusinessException("Tool.num2Word.NumberOutOfRangeException", "金额大写(" + v + ")转换失败");
		}
		long l = Math.round(v * 100);
		if (l == 0) {
			return "零元整";
		}
		String strValue = l + "";
		// i用来控制数
		int i = 0;
		// j用来控制单位
		int j = UNIT.length() - strValue.length();
		String rs = "";
		boolean isZero = false;
		for (; i < strValue.length(); i++, j++) {
			char ch = strValue.charAt(i);
			if (ch == '0') {
				isZero = true;
				if (UNIT.charAt(j) == '亿' || UNIT.charAt(j) == '万'
						|| UNIT.charAt(j) == '元') {
					rs = rs + UNIT.charAt(j);
					isZero = false;
				}
			} else {
				if (isZero) {
					rs = rs + "零";
					isZero = false;
				}
				rs = rs + DIGIT.charAt(ch - '0') + UNIT.charAt(j);
			}
		}
		if (!rs.endsWith("分")) {
			rs = rs + "整";
		}
		rs = rs.replaceAll("亿万", "亿");
		return rs;
	}

	public static void main(String[] args) {
		System.out.println(Tool.num2Word(123567891234.9845));
	}
}