定制小程序开发费用map转换成JSON的方法

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);
1
2
3
4
5

2.map转string

  Map<String, Object> map = new HashMap<>();        map.put("a", "b");        String s = JSONObject.toJSONString(map);
1
2
3

3.JSON转String

  JSONObject json = new JSONObject();        json.put("c", "v");        json.put("z", "123n);        json.toJSONString();
1
2
3
4
5

4.JSON转Map

JSONObject json = new JSONObject();        json.put("ccc", "321");        json.put("bbb", "123");        Map<String, Object> map = (Map<String, Object>)json;
1
2
3
4
5

5.String转JSON

 String str = "{"username":"dsad","qwewqe":"123"}";JSONObject json = JSONObject.parseObject(str);
1
2

2 google

maven坐标

<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson --><dependency>    <groupId>com.google.code.gson</groupId>    <artifactId>gson</artifactId>    <version>2.3.1</version></dependency>
1
2
3
4
5
6

//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"}
1
2
3
4
5
6

//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--->bbbc--->ccca--->aaa*/
1
2
3
4
5
6
7
8
9
10
11

map定制小程序开发费用中含有对象Map -> JSON

//Map -> JSONMap<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"	}}*/
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

//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"}*/
1
2
3
4
5
6
7
8
9

-------------------=-------------------------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~~~
1
2
3
4
5
6
7
8
9
10