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

<!-- 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>

//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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