java中如何使用json

JSON是一种轻量级的数据交换格式。它基于JavaScript的一个子集。 JSON采用完全独立于语言的文本格式，但是也使用了类似于C语言家族的习惯。这些特性使JSON成为理想的数据交换语言。易于人阅读和编写，同时也易于机器解析，在java中使用json会个好的进行交互

1,java类转json

XStream xstream = new XStream(new JsonHierarchicalStreamDriver());

xstream.alias("rootdata", haha.class);

haha h=new haha();

h.setId(1);

h.setName("haha");

System.out.println(xstream.toXML(h));

结果为

{"rootdata": {

  "id": 1,

  "name": "haha"

}}

2,list转json 

XStream xstream = new XStream(new JsonHierarchicalStreamDriver());

List he=newArrayList();

xstream.alias("rootdata", List.class);

he.add("haha");

he.add("hehe");

he.add("nana");

System.out.println(xstream.toXML(he));

结果为

{"rootdata": [

  "haha",

  "hehe",

  "nana"

]}

3,map转json

XStream xstream = new XStream(new JsonHierarchicalStreamDriver());

Map map=newHashMap();

map.put(1, "你");

map.put(2, "好");

map.put("3","good");

xstream.alias("rootdata", Map.class);

System.out.println(xstream.toXML(map));

结果为

{"rootdata": [

  [

    "3",

    "good"

  ],

  [

    1,

    "你"

  ],

  [

    2,

    "好"

  ]

]}

4,数组转json

XStream xstream = new XStream(new JsonHierarchicalStreamDriver());

int[] a=newint[]{1,2,3,4,5,6,7,8};

xstream.alias("rootdata",int[].class);

System.out.println(xstream.toXML(a));

结果为

{"rootdata": [

  1,

  2,

  3,

  4,

  5,

  6,

  7,

  8

]}