怎么把一个字符串转换为汉字

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package com.oa.pub;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**

*

* @author Administrator

*/

public class Amount2RMB {

private static final Pattern AMOUNT_PATTERN = Pattern.compile("^(-?)(0|[1-9]\\d{0,11})\\.(\\d{0,4})"); // 不考虑分隔符的正确性

private static final char[] RMB_NUMS = "零壹贰叁肆伍陆柒捌玖".toCharArray();

private static final String[] UNITS = {"元", "角", "分", "整","厘","毫"};

private static final String[] U1 = {"", "拾", "佰", "仟"};

private static final String[] U2 = {"", "万", "亿"};

/**

* 将金额（整数部分等于或少于12位）转换为中文大写形式.

* @param amount 金额数字

* @return 中文大写

* @throws IllegalArgumentException

*/

public static String convert(String amount) throws IllegalArgumentException {

// 去掉分隔符

amount = amount.replace(",", "");

double num=Double.parseDouble(amount);

amount=String.format("%.2f",num);

// 验证金额正确性

if (amount.equals("0.00")) {

throw new IllegalArgumentException("金额不能为零.");

}

Matcher matcher = AMOUNT_PATTERN.matcher(amount);

if (!matcher.find()) {

throw new IllegalArgumentException("输入金额有误.");

}

String trigger=matcher.group(1);

String integer = matcher.group(2); // 整数部分

String fraction = matcher.group(3); // 小数部分

String result = "";

if(trigger.equals("-")){

result += "负";

}

if (!integer.equals("0")) {



result += integer2rmb(integer) + UNITS[0]; // 整数部分



}

if (fraction.matches("0*")) {

result += UNITS[3]; // 添加[整]

} else if (fraction.startsWith("0") && integer.equals("0")) {

result += fraction2rmb(fraction).substring(1); // 去掉分前面的[零]

} else {

result += fraction2rmb(fraction); // 小数部分

}

return result;

}

// 将金额小数部分转换为中文大写

private static String fraction2rmb(String fraction) {

StringBuffer sb=new StringBuffer();

char jiao='0';

char fen='0';

char li='0';

char hao='0';

int length=fraction.length();

if(length>0){

jiao = fraction.charAt(0); // 角

}

if(length>1){

fen = fraction.charAt(1); // 分

}

if(length>2){

li=fraction.charAt(2);

}

if(length>3){

hao=fraction.charAt(3);

}

return (RMB_NUMS[jiao - '0'] + (jiao > '0' ? UNITS[1] : ""))

+ (fen > '0' ? RMB_NUMS[fen - '0'] + UNITS[2] : "")

+ (li>'0'?RMB_NUMS[li-'0']+UNITS[4]:"")

+ (hao>'0'?RMB_NUMS[hao-'0']+UNITS[5]:"");

}

// 将金额整数部分转换为中文大写

private static String integer2rmb(String integer) {

StringBuilder buffer = new StringBuilder();

// 从个位数开始转换

int i, j;

for (i = integer.length() - 1, j = 0; i >= 0; i--, j++) {

char n = integer.charAt(i);

if (n == '0') {

// 当n是0且n的右边一位不是0时，插入[零]

if (i < integer.length() - 1 && integer.charAt(i + 1) != '0') {

buffer.append(RMB_NUMS[0]);

}

// 插入[万]或者[亿]

if (j % 4 == 0) {

if (i > 0 && integer.charAt(i - 1) != '0'

|| i > 1 && integer.charAt(i - 2) != '0'

|| i > 2 && integer.charAt(i - 3) != '0') {

buffer.append(U2[j / 4]);

}

}

} else {

if (j % 4 == 0) {

buffer.append(U2[j / 4]); // 插入[万]或者[亿]

}

buffer.append(U1[j % 4]); // 插入[拾]、[佰]或[仟]

buffer.append(RMB_NUMS[n - '0']); // 插入数字

}

}

return buffer.reverse().toString();

}

public static void main(String[] args){

System.out.println(Amount2RMB.convert("-20.09"));

}



}