如何解析从HTTP收到的Json字符串并遍历这些值

var jsonString = '{"name":"John", "age":30, "city":"New York"}';
var jsonObj = JSON.parse(jsonString);

for (var key in jsonObj) {
  if (jsonObj.hasOwnProperty(key)) {
    console.log(key + ": " + jsonObj[key]);
  }
}

import json

jsonString = '{"name":"John", "age":30, "city":"New York"}'
jsonObj = json.loads(jsonString)

for key, value in jsonObj.items():
  print(key + ": " + str(value))

import com.fasterxml.jackson.databind.ObjectMapper;

String jsonString = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";
ObjectMapper objectMapper = new ObjectMapper();
Map<String, Object> jsonObj = objectMapper.readValue(jsonString, Map.class);

for (Map.Entry<String, Object> entry : jsonObj.entrySet()) {
  System.out.println(entry.getKey() + ": " + entry.getValue());
}