阿拉伯数字转换为汉字数字

public class NumberFormatUtil {

static String[] units = {"","十","百","千","万","十万","百万","千万","亿","十亿","百亿","千亿","万亿" };
static char[] numArray = {'零','一','二','三','四','五','六','七','八','九'};

/**
* 将整数转换成汉字数字
* @param num 需要转换的数字
* @return 转换后的汉字
*/
public static String formatInteger(int num) {
char[] val = String.valueOf(num).toCharArray();
int len = val.length;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
String m = val[i] + "";
int n = Integer.valueOf(m);
boolean isZero = n == 0;
String unit = units[(len - 1) - i];
if (isZero) {
if ('0' == val[i - 1]) {
continue;
} else {
sb.append(numArray
);
}
} else {
sb.append(numArray
);
sb.append(unit);
}
}
return sb.toString();
}
/**
* 将小数转换成汉字数字
* @param decimal 需要转换的数字
* @return 转换后的汉字
*/
public static String formatDecimal(double decimal) {
String decimals = String.valueOf(decimal);
int decIndex = decimals.indexOf(".");
int integ = Integer.valueOf(decimals.substring(0, decIndex));
int dec = Integer.valueOf(decimals.substring(decIndex + 1));
String result = formatInteger(integ) + "." + formatFractionalPart(dec);
return result;
}

/**
* 格式化小数部分的数字
* @param decimal 需要转换的数字
* @return 转换后的汉字
*/
public static String formatFractionalPart(int decimal) {
char[] val = String.valueOf(decimal).toCharArray();
int len = val.length;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
int n = Integer.valueOf(val[i] + "");
sb.append(numArray
);
}
return sb.toString();
}
}