1. Gson
1.1 添加pom依赖
<dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.2.4</version> </dependency>
1.2 转化方法
① 对象转 Json
Gson gson = new Gson(); String json = gson.toJson(Object object);
② Json转对象
gson.fromJson(String json, Class<T> classOfT)
③ 集合转Json
Gson gson = new Gson(); String json = gson.toJson(Object object);
④ Json转集合
TypeToken<T> typeOfT = new TypeToken<T>(){}; T fromJson = (T)gson.fromJson(json, typeOfT.getType());
2. Json-lib
2.1 添加pom依赖
<dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency>
2.2 转化方法
① 对象转 Json
JSONObject fromObject = JSONObject.fromObject(Object object);
String string = fromObject.toString();
② Json转对象
JSONObject fromObject2 = JSONObject.fromObject(string);
Object bean =JSONObject.toBean(JSONObject jsonObject, Class beanClass);
③ 集合转Json
JSONArray fromObject = JSONArray.fromObject(Object object);
String string = fromObject.toString();
④ Json转集合
JSONArray fromObject2 = JSONArray.fromObject(string);
Collection collection = JSONArray.toCollection(JSONArray jsonArray, Class objectClass);
3. Fastjson
2.1 添加pom依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.31</version>
</dependency>
2.2 转化方法
① 对象转 Json
JSON.toJSONString(Object object);
② Json转对象
JSON.parseObject(String text,Class<T> Class);
③ 集合转Json
JSON.toJSONString(Object object);
④ Json转集合
JSON.parseArray(String text,Class<T> Class);