将 JSON 字符串转换为 HashMap [英] Convert a JSON String to a HashMap
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问题描述
我使用的是 Java,我有一个 JSON 字符串:
I'm using Java, and I have a String which is JSON:
{
"name" : "abc" ,
"email id " : ["abc@gmail.com","def@gmail.com","ghi@gmail.com"]
}
然后是我的 Java 地图:
Then my Map in Java:
Map<String, Object> retMap = new HashMap<String, Object>();
我想将来自 JSONObject 的所有数据存储在该 HashMap 中.
I want to store all the data from the JSONObject in that HashMap.
谁能提供代码?我想使用 org.json
库.
Can anyone provide code for this? I want to use the org.json
library.
推荐答案
几天前我通过递归编写了这段代码.
I wrote this code some days back by recursion.
public static Map<String, Object> jsonToMap(JSONObject json) throws JSONException {
Map<String, Object> retMap = new HashMap<String, Object>();
if(json != JSONObject.NULL) {
retMap = toMap(json);
}
return retMap;
}
public static Map<String, Object> toMap(JSONObject object) throws JSONException {
Map<String, Object> map = new HashMap<String, Object>();
Iterator<String> keysItr = object.keys();
while(keysItr.hasNext()) {
String key = keysItr.next();
Object value = object.get(key);
if(value instanceof JSONArray) {
value = toList((JSONArray) value);
}
else if(value instanceof JSONObject) {
value = toMap((JSONObject) value);
}
map.put(key, value);
}
return map;
}
public static List<Object> toList(JSONArray array) throws JSONException {
List<Object> list = new ArrayList<Object>();
for(int i = 0; i < array.length(); i++) {
Object value = array.get(i);
if(value instanceof JSONArray) {
value = toList((JSONArray) value);
}
else if(value instanceof JSONObject) {
value = toMap((JSONObject) value);
}
list.add(value);
}
return list;
}
使用 Jackson 库:
Using Jackson library:
import com.fasterxml.jackson.databind.ObjectMapper;
TypeReference<HashMap<String, Object>> typeRef = new TypeReference<>() {};
Map<String, Object> mapping = new ObjectMapper().readValue(jsonStr, typeRef);
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