问题描述
在 Jackson 中，我可以映射 YAML 中的字符串:
In Jackson, I can map a string in YAML:
regexField: "(\d{2}):(\d{2})"
到类上的 Pattern 字段:
final class MappedFromYaml {
private Pattern regexField;
// ... accessors
}
Jackson 的 ObjectMapper 将创建一个带有默认标志的 Pattern.是否可以使用设置的特定标志来创建它，例如 Pattern.MULTILINE?理想情况下，我希望能够在 YAML 中指定这些标志，但如果未能在 Java 代码中为特定字段指定标志的解决方案也将不胜感激.
Jackson's ObjectMapper will create a Pattern with default flags. Is it possible to make it create it with specific flags set, such as Pattern.MULTILINE? Ideally I would like to be able to specify those flags in YAML, but failing that a solution that specifies the flags for a specific field in Java code would also be appreciated.
推荐答案
有两种方法.第一个是将标志直接嵌入 到正则表达式中:
There are two ways. The first is embedding flags directly into the regex:
regexField: "(\d{2}):(\d{2})(?m)"
否则不要直接映射到Pattern，而是引入一个自定义类型，比如PatternBuilder
Otherwise don't map directly to Pattern, but introduce a custom type like a PatternBuilder
public class PatternBuilder {
public String regex;
public boolean multiline;
public Pattern pattern() {
int flags = 0;
if (multiline) flags |= Pattern.MULTILINE;
return Pattern.compile(regex, flags);
}
}
可以从 YAML 构建
that can be built from the YAML
pattern:
regex: "(\d{2}):(\d{2})"
multiline: true
这篇关于Jackson YAML:使用标志映射正则表达式模式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！