杰克逊是如何自动反序列化java.nio.file.Path的？

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;

public class PathDeserializer extends JsonDeserializer<Path> {

    @Override
    public Path deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        String pathString = jsonParser.getValueAsString();
        return Paths.get(pathString);
    }
}

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

@JsonDeserialize(using = PathDeserializer.class)
public class MyClass {
    private Path filePath;

    public Path getFilePath() {
        return filePath;
    }

    public void setFilePath(Path filePath) {
        this.filePath = filePath;
    }
}

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
    public static void main(String[] args) throws IOException {
        String json = "{\"filePath\":\"/path/to/file.txt\"}";

        ObjectMapper objectMapper = new ObjectMapper();
        MyClass myObject = objectMapper.readValue(json, MyClass.class);

        System.out.println(myObject.getFilePath()); // 输出：/path/to/file.txt
    }
}