数字转换成汉字

我们通过追加的方式来实现，考虑到我们的数字是四四分组的，所以我们要先实现四位数正确转换，上述问题解决之后，再打印四位以上数字时，我们就可以通过追加的方式解决五位以上数“万”字的追加，同时此程序只能对千万级别以内的数字进行转换。

public class Test02 {
    public static void main(String[] args) {
        try (BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("res/test.txt"), "UTF-8"));
             BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("res/trans.txt"), "UTF-8"))
        ) {
            String str;
            int percent = 0;
            while ((str = br.readLine()) != null) {
                bw.write(trans_wan(Integer.parseInt(str)));
                bw.newLine();
                Thread.sleep(100);
                percent++;
                System.out.print("\r[");
                for (int i = 0; i < 20; i++) {
                    if (i < percent / 5){   进度条的读取显示
                        System.out.print("=");
                    } else if (i == percent / 5) {
                        System.out.print(">");
                    } else {
                        System.out.print(" ");
                    }
                }
                System.out.print("]");
                System.out.printf("\t%.2f%%", (float)percent);
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    private static String trans_wan(int num) {
        StringBuilder builder = new StringBuilder();
        if (num / 10000 > 0) {
            builder.append(trans(num / 10000)).append("万");
        }
        if (num % 10000 > 0) {
            String trans = trans(num % 10000);
            if (builder.length() > 0) {
                if (trans.length() <= 1 || trans.charAt(1) != '千') {
                    builder.append("零");
                }
            }
            builder.append(trans);
        }
        if (builder.length() == 0) {
            builder.append("零");
        }
        return builder.toString();
    }

    private static String trans(int num) {
        // 中文大写数字数组
        String[] numeric = new String[] {"零", "一", "二", "三", "四", "五", "六", "七", "八", "九"};
        StringBuilder builder = new StringBuilder();
        builder.append(numeric[num / 1000]).append("千")
                .append(numeric[num / 100 % 10]).append("百")
                .append(numeric[num / 10 % 10]).append("十")
                .append(numeric[num % 10]);
        int index = -1;
        while ((index = builder.indexOf(numeric[0], index + 1)) != -1) {
            if (index < builder.length() - 1) {
                builder.deleteCharAt(index + 1);
            }
        }
        index = 0;
        while ((index = builder.indexOf("零零", index)) != -1) {
            builder.deleteCharAt(index);
        }
        if (builder.length() > 1) {
            if (builder.indexOf(numeric[0]) == 0) {
                builder.deleteCharAt(0);
            }
            if (builder.lastIndexOf(numeric[0]) == builder.length() - 1) {
                builder.deleteCharAt(builder.length() - 1);
            }
        }
        if (builder.indexOf("一十") == 0) {
            builder.deleteCharAt(0);
        }
        return builder.toString();
    }
}

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