将原始数据转换为自定义的xml

Java Stream API可以帮助你

String raw ="name1|value1\n" +
                "name2|value2";
String template = "<data attribute=\"%s\">%s</data>";
String output = Arrays.stream(raw.split("\n"))
        .map(rawPair -> rawPair.split("\\|"))
        .map(pair -> String.format(template, pair[0], pair[1]))
        .collect(Collectors.joining("\n"));

将输出

value1 value2 但是拥有特定的业务逻辑需要更多的动作。首先获取国家/地区代码，然后在流处理中修饰你的属性名称

BiFunction<String, String, String> decorate = (String name, String code) -> {
    if ("state".equals(name)) {
        return name + code;
    } else {
        return name;
    }
};
Function<String, String> countryCode = (String source) -> {
    String head = "country|";
    int start = source.indexOf(head) + head.length();
    return source.substring(start, start + 2);
};

String code = countryCode.apply(raw);

...
.map(pair -> String.format(template, decorate.apply(pair[0], code), pair[1]))
...