通用映射JSON封送和用Moxy解封

Question

null

杰克逊在默认情况下有能力做到这一点。

Answer 1

我试图通过JAXB RI(XML)获得您想要的内容：

@XmlRootElement
public class Foo {
    @XmlJavaTypeAdapter(MapAdapter.class)
    public Map<String, Object> map;
}

public class MapAdapter extends XmlAdapter<MapEntry[], Map<String, Object>> {
    @Override
    public Map<String, Object> unmarshal(MapEntry[] v) throws Exception {
        Map<String, Object> map = new HashMap<>();
        for (MapEntry me : v)
            map.put(me.key, me.value);
        return map;
    }
    @Override
    public MapEntry[] marshal(Map<String, Object> v) throws Exception {
        MapEntry[] mes = new MapEntry[v.size()];
        int i = 0;
        for (Map.Entry<String, Object> entry : v.entrySet())
            mes[i++] = new MapEntry(entry.getKey(), entry.getValue());
        return mes;
    }
}

public class MapEntry {
    public String key;
    public Object value;

    public MapEntry() {}

    public MapEntry(String key, Object value) {
        this.key = key;
        this.value = value;
    }
}

不幸的是，MOXy有一些bug（https://bugs.eclipse.org/bugs/show_bug.cgi？id=465014)，无法处理这个问题。

如果你需要MOXy，那么你必须使用Blaise博客中描述的方法：

@XmlRootElement
public class MoxyFoo {
    @XmlJavaTypeAdapter(MoxyMapAdapter.class)
    public Map<String, Object> map = new HashMap<>();
}

public class MoxyMapAdapter extends XmlAdapter<MoxyMapAdapter.AdaptedMap, Map<String, Object>> {
    @Override
    public AdaptedMap marshal(Map<String, Object> map) throws Exception {
        AdaptedMap adaptedMap = new AdaptedMap();
        for (Entry<String, Object> entry : map.entrySet()) {
            AdaptedEntry adaptedEntry = new AdaptedEntry();
            adaptedEntry.key = entry.getKey();
            adaptedEntry.value = entry.getValue();
            adaptedMap.entries.add(adaptedEntry);
        }
        return adaptedMap;
    }
    @Override
    public Map<String, Object> unmarshal(AdaptedMap adaptedMap) throws Exception {
        List<AdaptedEntry> adaptedEntries = adaptedMap.entries;
        Map<String, Object> map = new HashMap<>(adaptedEntries.size());
        for (AdaptedEntry adaptedEntry : adaptedEntries) {
            map.put(adaptedEntry.key, adaptedEntry.value);
        }
        return map;
    }

    public static class AdaptedMap {
        @XmlVariableNode("key")
        List<AdaptedEntry> entries = new ArrayList<>();
    }

    public static class AdaptedEntry {
        @XmlTransient
        public String key;
        @XmlValue
        public Object value;
    }
}