使用地图

Question

我有如下的字符串，

  

{Account = {type = object，id = {type = integer，format = int64}，enum = [ENABLED，DISABLED]}，token = {type = string}}}，AssetPlayerRequest = {type = object，properties = {assetPlayer = {description =资产播放器详细信息，{$ ref =＃/ definitions / AssetPlayer}，ImageFile = {type = object，properties = {description = {type = string}，filePath = {type = string}，fileUri = {$ REF =＃/定义/ URI}}}

我希望将{$ref=#/definitions/URI}，{$ref=#/definitions/AssetPlayer}等RegEx模式替换为地图中可用的值，例如URI，AssetPlayer，它们是RegEx本身的一部分。

如何在Java 8中实现这一目标？

Answer 1

部分改编自Matcher.replaceAll()：

public static void main(String[] args) {
    Map<String, String> replacements = new HashMap<>();
    replacements.put("AssetPlayer", "replacement1");
    replacements.put("URI", "replacement2");

    String input = "{Account={type=object,id={type=integer, format=int64}, enum=[ENABLED, DISABLED]}, token={type=string}}}, AssetPlayerRequest={type=object, properties={assetPlayer={description=The asset player details, {$ref=#/definitions/AssetPlayer},ImageFile={type=object, properties={description={type=string}, filePath={type=string}, fileUri={$ref=#/definitions/URI}}}";

    Matcher matcher = Pattern.compile("\\{\\$ref=#\\/definitions\\/(.+?)\\}").matcher(input);
    StringBuffer sb = new StringBuffer();
    if (matcher.find()) {
        do {
            String replacement = replacements.get(matcher.group(1));
            matcher.appendReplacement(sb, Matcher.quoteReplacement(replacement));
        } while (matcher.find());
        matcher.appendTail(sb);
        System.out.println(sb.toString());
    } else {
        System.out.println(input);
    }
}

输出：

{Account={type=object,id={type=integer, format=int64}, enum=[ENABLED, DISABLED]}, token={type=string}}}, AssetPlayerRequest={type=object, properties={assetPlayer={description=The asset player details, replacement1,ImageFile={type=object, properties={description={type=string}, filePath={type=string}, fileUri=replacement2}}

Answer 2

替换需要更多逻辑的字符串中的内容的通用公式位于Matcher#appendReplacement：

public String bindTemplateVariables(String input) {
    Pattern p = Pattern.compile("\\{\\$ref=#/definitions/(.*?)\\}");
    Matcher m = p.matcher(input);
    StringBuffer sb = new StringBuffer();
    while (m.find()) {
        String replacement = map.get(m.group(1));
        m.appendReplacement(sb, replacement);
    }
    m.appendTail(sb);
    return sb.toString();
}