java - 如何使用索引将字符替换为字符串

Question

嗨，用字符串替换字符的最佳方法是什么:例如:

就我而言，我有一个包含拉丁字符和符号的字符串，我正在使用 intermec 打印机打印它。我必须使用以下打印机传递字符的 ASCII 代码说明:

 instruction CHR$(<dec. ascii value>)

示例:此文本:N°Box 将像这样转换:

    "N\""+";CHR$(179); \""+"Box"

我写了这个:

if (!isValid(str)) {
    Map charsAsciiCode = new HashMap();
    for (int i = 0; i < str.length(); i++) {
        String c = String.valueOf(str.charAt(i));
        if (specialCharsMap.containsKey(c)) {
            String decimalString = (String) specialCharsMap.get(c);
            charsAsciiCode.put(new Integer(i), " \";CHR$(" + decimalString + ");\"");
        }
    }

    Iterator iter = charsAsciiCode.entrySet().iterator();

    while (iter.hasNext()) {
        Map.Entry mapEntry = (Map.Entry) iter.next();
        int charIndex = (int) mapEntry.getKey();
        String charAscii = (String) mapEntry.getValue();

        // Here i want to replace every char with the correspondant Ascii value
    }
}

static boolean isValid(String input) {
    Matcher m = p.matcher(input);
    return m.matches();
}

final static Pattern p = Pattern.compile("\\p{Alpha}+");
private static Map specialCharsMap = new HashMap();

static {
    specialCharsMap.put("é", "123");
    specialCharsMap.put("è", "125");
    specialCharsMap.put("à", "64");
    specialCharsMap.put("ç", "92");
    specialCharsMap.put("^", "94");
    specialCharsMap.put("'", "39");
}

Answer 1

您不需要 map ，因为您可以执行以下操作:

StringBuilder sb = new StringBuilder();

for (int i = 0; i < str.length(); i = i+1) {
    char ch = str.charAt(i);
    if (ch > 127) {
        // TODO: generate all the \\""+; crap around CHR$()
        sb.append(String.format("CHR$(%d)", (int)ch));
    }
    else 
        sb.append ch;
}