Java实现map转换成json的方法详解 Java实现map转换成json的方法详解

1.alibaba falstjson

1.Map转JSON
2.map转string
3.JSON转String
4.JSON转Map
5.String转JSON

2.google

maven坐标
Map转换成JSON
JSON转换成Map
map中含有对象Map -> JSON
JSON -> Map

附–MAP的ASCII排序

1.alibaba falstjson
1.Map转JSON

Map map = new HashMap(); map.put("a", "a"); map.put("b", "123"); JSONObject json = new JSONObject(map);

2.map转string

Map 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 map = (Map)json;

5.String转JSON

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

【Java实现map转换成json的方法详解】
2.google
maven坐标

com.google.code.gsongson2.3.1

Map转换成JSON

Map map = new HashMap(); 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 entry = (Map.Entry)mapData; System.out.println(entry.getKey()+"--->"+entry.getValue()); }/*输出b--->bbbc--->ccca--->aaa*/

map中含有对象Map -> JSON

//Map -> JSONMap map = new HashMap(); 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 map1 = (Map)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 keys = new ArrayList(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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