[英]How to create a JSON with unknown number of fields?
I need to convert a structure like this:我需要转换这样的结构:
List<String> fields;
to JSON like this:像这样到 JSON :
{
"field1": "data1",
"field2": "data2",
"field3": "data3",
...
}
How can I do this?我怎样才能做到这一点?
UPD: List contains values, like this: UPD:列表包含值,如下所示:
List<String> fields = List.of("data1", "data2", "data3");
ObjectNode objectNode = new ObjectMapper().createObjectNode();
List<String> fields = new ArrayList<>();
fields.add("data1");
fields.add("data2");
fields.add("data3");
for (int i = 0; i < fields.size(); i++) {
objectNode.put("field" + (i+1), fields.get(i));
}
System.out.println(objectNode.toPrettyString());
Output Output
{
"field1" : "data1",
"field2" : "data2",
"field3" : "data3"
}
you can use map collection Map<String,Object> :您可以使用 map 集合Map<String,Object> :
Map<String,Object> mapp = new HashMap<>();
mapp.put("field1", "data1");
mapp.put("field2", "data2");
mapp.put("field3", "data3");
mapp.put("field4", "data4");
JSONObject json = new JSONObject(mapp);
System.out.println(json);
output: output:
{
"field1":"data1",
"field3":"data3",
"field2":"data2",
"field4":"data4"
}
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