java Jackson - 递归解析为 Map<String, Object>
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Hymanson - Recursive parsing into Map<String, Object>
提问by shkschneider
I'm trying to simplify my code: I want to store key and values (all strings).
我正在尝试简化我的代码：我想存储键和值（所有字符串）。
I'm actually using a Map<String, Object>to store it. hat way Objectcould be a value (String) or a new node (Map<String, Object>).
我实际上使用 aMap<String, Object>来存储它。这种方式Object可以是一个值 ( String) 或一个新节点 ( Map<String, Object>)。
How could I simplify this code? A recursive function would be good.
我怎样才能简化这段代码？递归函数会很好。
try {
JsonParser jsonParser = new JsonFactory().createJsonParser(content);
jsonParser.nextToken();
while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
jsonParser.nextToken();
if (jsonParser.getCurrentToken() == JsonToken.START_OBJECT) {
while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
String key = jsonParser.getCurrentName();
jsonParser.nextToken();
if (jsonParser.getCurrentToken() == JsonToken.START_OBJECT) {
mData.put(key, new HashMap<String, Object>());
while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
String subkey = jsonParser.getCurrentName();
jsonParser.nextToken();
if (jsonParser.getCurrentToken() == JsonToken.START_OBJECT) {
Map<String, Object> subdata = (Map<String, Object>) mData.get(key);
subdata.put(subkey, new HashMap<String, Object>());
while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
String subsubkey = jsonParser.getCurrentName();
jsonParser.nextToken();
Map<String, Object> subsubdata = (Map<String, Object>) subdata.get(subkey);
LogHelper.d("data[" + key + "][" + subkey + "][" + subsubkey + "]=" + jsonParser.getText());
subsubdata.put(subsubkey, jsonParser.getText());
}
}
else {
LogHelper.d("data[" + key + "]=" + jsonParser.getText());
mData.put(key, jsonParser.getText());
}
}
}
else {
LogHelper.d("data[" + key + "]=" + jsonParser.getText());
mData.put(key, jsonParser.getText());
}
}
}
else {
LogHelper.d("status=" + jsonParser.getText());
mStatus = jsonParser.getText();
}
}
}
catch (IllegalArgumentException e) {
error("0", "IllegalArgumentException: " + e.getMessage());
}
catch (JsonParseException e) {
error("0", "IOException: " + e.getMessage());
}
catch (IOException e) {
error("0", "IOException: " + e.getMessage());
}
回答by Perception
Assuming that your end goal is just to deserialize JSON into a Map<String, Object>, there is a far simpler way to do this with Hymanson. Using ObjectMapper:
假设您的最终目标只是将 JSON 反序列化为Map<String, Object>，那么使用 Hymanson 有一种更简单的方法。使用ObjectMapper：
final String json = "{}";
final ObjectMapper mapper = new ObjectMapper();
final MapType type = mapper.getTypeFactory().constructMapType(
Map.class, String.class, Object.class);
final Map<String, Object> data = mapper.readValue(json, type);
You will need error handling etc, but this is a good starting point.
您将需要错误处理等，但这是一个很好的起点。
