map转换成JSON的方法

2023-6-12 10:28| 发布者: zhaojun917| 查看: 559| 评论: 0

摘要: 第一种alibaba falstjson：1.Map转JSON MapString, Object map = new HashMapString, Object(); map.put("a", "a"); map.put("b", "123"); JSONObject json = new JSONObject(map);2.map转string MapString ...

第一种alibaba falstjson：

1.Map转JSON

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

map.put("a", "a");

map.put("b", "123");

JSONObject json = new JSONObject(map);

2.map转string

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

map.put("a", "b");

String s = JSONObject.toJSONString(map);

3.JSON转String

JSONObject json = new JSONObject();

json.put("c", "v");

json.put("z", "123n);

json.toJSONString();

4.JSON转Map

JSONObject json = new JSONObject();

json.put("ccc", "321");

json.put("bbb", "123");

Map<String, Object> map = (Map<String, Object>)json;

5.String转JSON

String str = "{"username":"dsad","qwewqe":"123"}";

JSONObject json = JSONObject.parseObject(str);

2 google

maven坐标

<groupId>com.google.code.gson</groupId>

</dependency>

//Map转换成JSON

Map<String,String> map = new HashMap<String,String>();

map.put("a","aaa");

map.put("b","bbb");

map.put("c","ccc");

String json=JSON.toJSONString(map);

System.out.println(json);//输出{"a":"aaa","b":"bbb","c":"ccc"}

//JSON转换成Map

Map map1 = JSON.parseObject(json);

System.out.println(map1.get("a"));

for (Object mapData : map.entrySet()) {

Map.Entry<String,String> entry = (Map.Entry<String,String>)mapData;

System.out.println(entry.getKey()+"--->"+entry.getValue());

}

/*输出

b--->bbb

c--->ccc

a--->aaa

*/

map中含有对象Map -> JSON

//Map -> JSON

Map<String,Bar> map = new HashMap<String, Bar>();

map.put("a",new Bar());

map.put("b",new Bar());

map.put("c",new Bar());

String json = JSON.toJSONString(map,true);

System.out.println(json);

/*

输出{

"a":{

"barAge":383687382,

"barDate":1494945882018,

"barName":"name_1689176802"

},

"b":{

"barAge":-100528778,

"barDate":1494945882018,

"barName":"name_-878176366"

},

"c":{

"barAge":-344075192,

"barDate":1494945882018,

"barName":"name_-1710740534"

}

*/

//JSON -> Map

Map<String,Bar> map1 = (Map<String,Bar>)JSON.parse(json);

for (String key : map1.keySet()) {

System.out.println(key+":"+map1.get(key));

}

/*输出

b:{"barAge":-100528778,"barDate":1494945882018,"barName":"name_-878176366"}

c:{"barAge":-344075192,"barDate":1494945882018,"barName":"name_-1710740534"}

a:{"barAge":383687382,"barDate":1494945882018,"barName":"name_1689176802"}

*/

-------------------=-------------------------附–MAP的ASCII排序-----------------------=------------------------

StringBuilder sb = new StringBuilder();

List<String> keys = new ArrayList<String>(map.keySet());

Collections.sort(keys);//排序。

for(String k : keys){

String v = params.get(k);

if(StringUtils.isNotEmpty(v)){

sb.append(v);

}

//return MD5.toMD5(sb+key, "UTF-8");这个就不用看了~~~

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map转换成JSON的方法

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