1.Gson

1.1把對象轉換為json字符串

Gson gson = new Gson(); String userJson = gson.toJson(userObject);

1.2 把json字符串轉換為對象

// str代表的是json字符串，Student.class代表的是你要轉成的類型
Gson gson = new Gson();
Student student = gson.fromJson(str, Student.class);

1.3 把json字符串轉換為List對象

Type type = new TypeToken<List<User>>() {}.getType(); List<User> userLists = new Gson().fromJson(json, type);

1.4 把list轉換為json格式字符串

String json = new Gson().toJson(list);

2.Jackson

2.1 把對象轉換為json字符串

ObjectMapper objectMapper = new ObjectMapper(); People peo = new People(); String jsonStr = objectMapper.writeValueAsString(peo);

2.2 把json字符串轉換為對象

ObjectMapper objectMapper = new ObjectMapper(); People peo = objectMapper.readValue(jsonStr, People.class);

2.3 把json字符串轉換為List集合

ObjectMapper objectMapper = new ObjectMapper(); JavaType javaType = objectMapper.getTypeFactory().constructParametricType(List.class, People.class); List<People> list = objectMapper.readValue(jsonStr, javaType);

總結

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