map转换成JSON的方法

科技前沿 • 2025-02-10 18:02 • 阅读 65

大家好，我是讯享网，很高兴认识大家。

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);

讯享网

2.map转string

讯享网 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

讯享网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

讯享网

讯享网<!-- 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

讯享网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":, "barDate":18, "barName":"name_" }, "b":{ "barAge":-, "barDate":18, "barName":"name_-" }, "c":{ "barAge":-, "barDate":18, "barName":"name_-" } } */

//JSON -> Map

讯享网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":-,"barDate":18,"barName":"name_-"} c:{"barAge":-,"barDate":18,"barName":"name_-"} a:{"barAge":,"barDate":18,"barName":"name_"} */

-------------------=-------------------------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~~~

map转换成JSON的方法

第一种alibaba falstjson：

2 google

相关推荐