转换Map< Integer，Object>用GSON转换为JSON? [英] Convert Map<Integer, Object> to JSON with GSON?

问题描述

Hee Guys

我很好奇是否可以通过GSON将Map转换为JSON，反之亦然?我放入的对象已经通过GSON从JSON转换为对象.

I'm curious if it is possible to convert a Map to JSON and vica versa with GSON? The object that i'm putting in is already converted to a Object from JSON with GSON.

我正在使用的对象看起来像这样:

Object that i'm using looks like this:

public class Locations{
    private List<Location> location;
    <-- Getter / Setter --> 

    public class Location{
        <-- Fields and Getters/Setters -->
    }
}

推荐答案

假设您使用的是java.util.Map:

Map<Integer, Object> map = new HashMap<>();

map.put(1, "object");

// Map to JSON
Gson gson = new Gson(); // com.google.gson.Gson
String jsonFromMap = gson.toJson(map);
System.out.println(jsonFromMap); // {"1": "object"}

// JSON to Map
Type type = new TypeToken<Map<String, String>>(){}.getType();
Map<String, String> map = gson.fromJson(json, type);
for (String key : map.keySet()) {
    System.out.println("map.get = " + map.get(key));
}

来源

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