flutter json工厂模式

请求到的JSON：

{ "a": "aa", "b": [ { "ba": "b1111", "bb": "b2222" }, { "ba": "b3333", "bb": "b4444" } ], "c": { "ca": "c111", "cb": "c222" } }

对JSON进行工厂模式：

class NameModel { String a; List<B> b; C c; NameModel({this.a, this.b, this.c}); NameModel.fromJson(Map<String, dynamic> json) { a = json['a']; if (json['b'] != null) { b = new List<B>(); json['b'].forEach((v) { b.add(new B.fromJson(v)); }); } c = json['c'] != null ? new C.fromJson(json['c']) : null; } //返回完整数据就使用toJson方法 Map<String, dynamic> toJson() { final Map<String, dynamic> data = new Map<String, dynamic>(); data['a'] = this.a; if (this.b != null) { data['b'] = this.b.map((v) => v.toJson()).toList(); } if (this.c != null) { data['c'] = this.c.toJson(); } return data; } } class B { String ba; String bb; B({this.ba, this.bb}); B.fromJson(Map<String, dynamic> json) { ba = json['ba']; bb = json['bb']; } Map<String, dynamic> toJson() { final Map<String, dynamic> data = new Map<String, dynamic>(); data['ba'] = this.ba; data['bb'] = this.bb; return data; } } class C { String ca; String cb; C({this.ca, this.cb}); C.fromJson(Map<String, dynamic> json) { ca = json['ca']; cb = json['cb']; } Map<String, dynamic> toJson() { final Map<String, dynamic> data = new Map<String, dynamic>(); data['ca'] = this.ca; data['cb'] = this.cb; return data; } }

使用工厂模式：

//1. 将请求到的数据解码（snapshot.data是请求到的数据） var data = json.decode(snapshot.data.toString()); //2. 将数据工厂化 NameModel dataName = NameModel.fromJson(data); //3. 使用里面需要的数据 setState(() { b = dataName.b })

JSON to Dart