将Java对象转换为Json，反之亦然? [英] Convert Java Object to Json and Vice versa?

问题描述

我知道JSON对象不过是String.

I know that JSON object is nothing but the String.

我的问题是我有一个对象图，我想将其转换为Json格式.

My question is that I have a Map of Object and i want to convert it into Json format.

示例:

Java Class ->
Class Person{
  private String name;
  private String password;
  private int number;
}

Java list ->
Map<List<Long>,List<Person>> map=new HashMap<List<Long>,List<Person>>();
..and map has Some data filled in it.

我想将该列表转换为

 Json Format?

我该如何实现?因为我想通过HttpClient发送... 如果没有，另一种替代方法是什么?

How I can achieve it? Because i want to send it over HttpClient... If not what is the other alternative way?

据我所知，有Gson API个可用，但我不知道如何使用它或以其他有效方式使用它.

As per my knowledge there is Gson API available, but I dont know how to use it and or in other efficient way.

谢谢

推荐答案

我得到了答案，但谢谢您的答复.

I got my Answer but Thank you for Your Responses.

 Map<Long,List<Person>> map=new HashMap<Long,List<Person>>();
    //adding some data

Gson gson=new Gson();
String mapJsonStr=gson.toJson(map);

//mapJsonStr : is my map's JSon Strin

反向

 TypeToken<Map<Long,List<Person>>> token = new TypeToken<Map<Long,List<Person>>>(){};
    Map<Long,List<Person>> map_new=new HashMap<Long,List<Person>>();
    map_new=gson.fromJson(mapJsonStr,token.getType());

    //origian map
// map_new is my Map get from map's Json String

就这样.谢谢

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