java中实现现金的转换

实现数字和现金的转换
import java.text.NumberFormat;
import java.util.HashMap;
import java.util.Scanner;

public class AmountOfConversion {
// 定义HashMap的value值
public static final String EMPTY = "";
public static final String ZERO = "零";
public static final String ONE = "壹";
public static final String TWO = "贰";
public static final String THREE = "叁";
public static final String FOUR = "肆";
public static final String FIVE = "伍";
public static final String SIX = "陆";
public static final String SEVEN = "柒";
public static final String EIGHT = "捌";
public static final String NINE = "玖";
public static final String TEN = "拾";
public static final String HUNDRED = "佰";
public static final String THOUSAND = "仟";
public static final String TEN_THOUSAND = "万";
public static final String HUNDRED_MILLION = "亿";
public static final String YUAN = "元";
public static final String JIAO = "角";
public static final String FEN = "分";
public static final String DOT = ".";
private static AmountOfConversion formatter = null;

// 创建AmountOfConversion的实例对象
// 创建初始化一个HashMap对象
private HashMap NumberMap = new HashMap();
private HashMap HighnumberofMoney = new HashMap();
// 创建初始化一个NumberFormat对象
private NumberFormat numberFormat = NumberFormat.getInstance();

private AmountOfConversion() {
// 在用new创建AmountOfConversion对象时，为HashMap对象进行key-value的映射
numberFormat.setMaximumFractionDigits(4);
// 设置数据的小数部分的最大位数是4位
numberFormat.setMinimumFractionDigits(2);
// 设置数据的小数部分的最小位数是2位
numberFormat.setGroupingUsed(false);
/* 设置此格式中是不可以使用组。如果设置可以使用组， 则数 1234567 可能被格式化为 "1,234,567" */
NumberMap.put("0", ZERO);
NumberMap.put("1", ONE);
NumberMap.put("2", TWO);
NumberMap.put("3", THREE);
NumberMap.put("4", FOUR);
NumberMap.put("5", FIVE);
NumberMap.put("6", SIX);
NumberMap.put("7", SEVEN);
NumberMap.put("8", EIGHT);
NumberMap.put("9", NINE);
NumberMap.put(DOT, DOT);
HighnumberofMoney.put("1", TEN);
HighnumberofMoney.put("2", HUNDRED);
HighnumberofMoney.put("3", THOUSAND);
HighnumberofMoney.put("4", TEN_THOUSAND);
HighnumberofMoney.put("5", TEN);
HighnumberofMoney.put("6", HUNDRED);
HighnumberofMoney.put("7", THOUSAND);
HighnumberofMoney.put("8", HUNDRED_MILLION);
}

public static AmountOfConversion getInstance() {

// 判断AmountOfConversion对象formatter是否初始化
if (formatter == null)
formatter = new AmountOfConversion();
return formatter;
}

// 进行金额转换的多种数据类型
public String format(String moneyStr) {
String result = "不能进行金额转换！！";
if (isConversion(moneyStr)) {
result = convertIntegerTochinese(moneyStr);
result = convertPointTochinese(result);
}
return result;
}

public String format(double moneyDouble) {
return format(numberFormat.format(moneyDouble));
}

public String format(int moneyInt) {
return format(numberFormat.format(moneyInt));
}

public String format(long moneyLong) {
return format(numberFormat.format(moneyLong));
}

public String format(Number moneyNum) {
return format(numberFormat.format(moneyNum));
}

private String convertIntegerTochinese(String moneyStr) {

// 将参数中传入的阿拉伯数字转换成中文
String result;
StringBuffer C2CStrBufer = new StringBuffer();
for (int i = 0; i < moneyStr.length(); i++) {
C2CStrBufer.append(NumberMap.get(moneyStr.substring(i, i + 1)));
}
// 拾佰仟万亿等都是汉字里面才有的单位，加上它们
int indexOfDot = C2CStrBufer.indexOf(DOT);
int moneyPatternCursor = 1;
for (int i = indexOfDot - 1; i > 0; i--) {
C2CStrBufer.insert(i, HighnumberofMoney.get(EMPTY
+ moneyPatternCursor));
moneyPatternCursor = moneyPatternCursor == 8 ? 1
: moneyPatternCursor + 1;
}
String fractionPart = C2CStrBufer.substring(C2CStrBufer.indexOf("."));
C2CStrBufer.delete(C2CStrBufer.indexOf("."), C2CStrBufer.length());
while (C2CStrBufer.indexOf("零拾") != -1) {
C2CStrBufer.replace(C2CStrBufer.indexOf("零拾"), C2CStrBufer
.indexOf("零拾") + 2, ZERO);
}
while (C2CStrBufer.indexOf("零佰") != -1) {
C2CStrBufer.replace(C2CStrBufer.indexOf("零佰"), C2CStrBufer
.indexOf("零佰") + 2, ZERO);
}
while (C2CStrBufer.indexOf("零仟") != -1) {
C2CStrBufer.replace(C2CStrBufer.indexOf("零仟"), C2CStrBufer
.indexOf("零仟") + 2, ZERO);
}
while (C2CStrBufer.indexOf("零万") != -1) {
C2CStrBufer.replace(C2CStrBufer.indexOf("零万"), C2CStrBufer
.indexOf("零万") + 2, TEN_THOUSAND);
}
while (C2CStrBufer.indexOf("零亿") != -1) {
C2CStrBufer.replace(C2CStrBufer.indexOf("零亿"), C2CStrBufer
.indexOf("零亿") + 2, HUNDRED_MILLION);
}
while (C2CStrBufer.indexOf("零零") != -1) {
C2CStrBufer.replace(C2CStrBufer.indexOf("零零"), C2CStrBufer
.indexOf("零零") + 2, ZERO);
}
if (C2CStrBufer.lastIndexOf(ZERO) == C2CStrBufer.length() - 1)
C2CStrBufer.delete(C2CStrBufer.length() - 1, C2CStrBufer.length());
C2CStrBufer.append(fractionPart);
result = C2CStrBufer.toString();
return result;
}

private String convertPointTochinese(String moneyStr) {

// 对小数点后面的数字进行汉字处理
String result;
StringBuffer C2CStrBufer = new StringBuffer(moneyStr);
int indexOfDot = C2CStrBufer.indexOf(DOT);
C2CStrBufer.replace(indexOfDot, indexOfDot + 1, YUAN);
C2CStrBufer.insert(C2CStrBufer.length() - 1, JIAO);
C2CStrBufer.insert(C2CStrBufer.length(), FEN);
if (C2CStrBufer.indexOf("零角零分") != -1)// 没有零头，加整
C2CStrBufer.replace(C2CStrBufer.indexOf("零角零分"), C2CStrBufer
.length(), "整");
else if (C2CStrBufer.indexOf("零分") != -1)// 没有零分，加整
C2CStrBufer.replace(C2CStrBufer.indexOf("零分"),
C2CStrBufer.length(), "整");
else {
if (C2CStrBufer.indexOf("零角") != -1)
C2CStrBufer.delete(C2CStrBufer.indexOf("零角"), C2CStrBufer
.indexOf("零角") + 2);
}
result = C2CStrBufer.toString();
return result;
}

private boolean isConversion(String moneyStr) {

// 判断参数传来的数据是否符合进行转换的条件
int fractionDigits = moneyStr.length() - moneyStr.indexOf(DOT) - 1;
boolean flag = true;
if (fractionDigits > 2) {
System.out.println("金额" + moneyStr + "的小数位多于两位。");
// 精度不能比分低
flag = false;
}
return flag;

}

public static void main(String args[]) {
System.out.println("请输入金额数：");
Scanner scanner = new Scanner(System.in);
String str = scanner.next();
System.out.println("转换后的金额为：");
System.out.println(getInstance().format(new Double(str)));
}
}