一般的服务端类型都有泛型支持,对于flutter来说虽然也支持泛型,但是在序列化这里却始终存在问题,flutter不允许用反射,对于flutter项目的开发来说除了画页面,可能最烦人的就是跟服务端打交道的时候对对象创建以及序列化,虽然目前网上也有通过json to dart之类的在线工具根据json生成model,但一个项目中那么多类,都这么做一遍太费劲,在有上下级类的情况下需要手动去一个个的调整,烦人,于是写了一个小工具通过 swagger.json 生成flutter model。
1,首先在C#中 我们知道可以的可以生成代码的有razor模板和T4模板,我是基于.net 5开发的于是就顺其自然的使用了当下流行的razor模板来生成代码
在代码引入类库RazorEngine.NetCore
代码语言:javascript复制 var config = new TemplateServiceConfiguration();
config.Language = Language.CSharp; // CSharp.NET as template language.
config.AllowMissingPropertiesOnDynamic = true;
config.CachingProvider = new DefaultCachingProvider(t => { });
config.EncodedStringFactory = new HtmlEncodedStringFactory(); // Html encoding.
config.Debug = false;
var service = RazorEngineService.Create(config);
var enummodel= File.ReadAllText("fluttermodel.cshtml");
var result = Engine.Razor.RunCompile(enummodel, "fluttermodel", null, modelsinfo[i]);
result 就是根据模板生成的最终代码,代码量非常少,代码生成中最主要的地方在于传入template的model,model中需要定义一个dart类中需要用到的所有信息,
2 template fluttermodel.cshtml
代码语言:javascript复制@using flutter_model_genrate_swagger;
@using System.Linq;
@using System.Text;
@{
var modeldes = "";
if (!string.IsNullOrEmpty(Model.Description))
{
modeldes = string.Concat("///", Model.Description);
}
var modelparams = "";//参数
var package = "";
if (Model.Package != null && Model.Package.Count > 0)
{
foreach (var pk in Model.Package)
{
package = string.Concat("import '", pk, ".dart';n");
}
}
}
@Raw(package)
@Raw(modeldes)
class @Model.Name {
@foreach (var proptey in Model.ModelPropties)
{
if (!string.IsNullOrEmpty(proptey.Description))
{
@Raw(string.Concat("///", proptey.Description,"n"))
}
@switch (proptey.Type)
{
case "array":
@{
string type = string.Concat("List<", @proptey.SubType, ">");
}
@Raw(type) @proptey.LowCaseName@(";")
break;
case "integer":
@("int ") @proptey.LowCaseName@(";")
break;
case "string":
@("String ") @proptey.LowCaseName@(";")
break;
case "boolean":
@("bool ") @proptey.LowCaseName@(";")
break;
case "number":
if (proptey.Format == "double")
{
@("double ") @proptey.LowCaseName@(";")
}
else
{
@Raw("///类型不确定")
@("double ") @proptey.LowCaseName@(";")
}
break;
default:
@Raw(proptey.Type " ")@proptey.LowCaseName@(";")
break;
}
@Raw("n");
if (string.IsNullOrEmpty(modelparams))
{
modelparams = string.Concat("this.", proptey.LowCaseName);
}
else
{
modelparams = string.Concat(",this.", proptey.LowCaseName);
}
}
@Model.Name @("({")@modelparams@("});")
@Raw("n")
@Model.Name@Raw(".fromJson(Map<String, dynamic> json) {") @Raw("n")
@foreach (var proptey in Model.ModelPropties)
{
@switch (proptey.Type)
{
case "array":
@{
string type = string.Concat("List<", @proptey.SubType, ">");
}
@Raw("if (json['")@proptey.Name@Raw("'] != null) {")@Raw("n")
@proptey.LowCaseName@Raw("=[];")@Raw("n")
@Raw("json['")@proptey.Name@Raw("'].forEach((v) {")@Raw("n")
@if (proptey.SubTypeDes == "baseType")
{
@proptey.LowCaseName@(".add(v);")@Raw("n")
}
else
{
@proptey.LowCaseName@(".add(")@proptey.SubType@Raw(".fromJson(v));")@Raw("n")
}
@Raw("});n")
@Raw(" } else {n")
@proptey.LowCaseName@Raw("=[];n")
@Raw("}n")
break;
case "integer":
case "string":
case "boolean":
case "number":
@proptey.LowCaseName@("=")@Raw("json['") @proptey.Name@Raw("'];")
break;
default:
//判断类型的
if (proptey.TypeDes == "object")
{
@proptey.LowCaseName@Raw("=json['")@proptey.Name@Raw("']!=null? ")@proptey.Type@Raw(".fromJson(json['")@proptey.Name@Raw("']) : null;n")
}
else
{
@proptey.LowCaseName@("=")@Raw("json['") @proptey.Name@Raw("'];")
}
break;
}
@Raw("n");
}
}
@Raw("Map<String, dynamic> toJson() { n")
@Raw("final Map<String, dynamic> data = new Map<String, dynamic>();n")
@foreach (var proptey in Model.ModelPropties)
{
switch (proptey.Type)
{
case "integer":
case "string":
case "boolean":
case "number":
@Raw("data['")@proptey.Name@Raw("'] = this.")@proptey.LowCaseName@Raw(";n")
break;
case "array":
//data['Data'] = this.data.map((v) => v.toJson()).toList();
@Raw("if (this.")@proptey.LowCaseName@Raw(" != null) { n")
@if (proptey.SubTypeDes == "baseType")
{
@Raw("data['")@proptey.Name@Raw("'] = this.")@proptey.LowCaseName@Raw(".toList();n")
}
else
{
@Raw("data['")@proptey.Name@Raw("'] = this.")@proptey.LowCaseName@Raw(".map((v) => v.toJson()).toList();n")
}
@Raw("}n")
break;//普通对象
default:
if (proptey.TypeDes == "object")
{
@Raw("if (this.")@proptey.LowCaseName@Raw(" != null) { n")
@Raw("data['")@proptey.Name@Raw("'] = this.")@proptey.LowCaseName@Raw(".toJson();n")
@Raw("}n")
}
else
{
@Raw("data['")@proptey.Name@Raw("'] = this.")@proptey.LowCaseName@Raw(";n")
}
break;
}
}
@Raw("return data;n")
@Raw("}n")
}
3 传入template的类定义
代码语言:javascript复制public enum ModelInfoType
{
Obj,
Enum
}
public class ModelInfo
{
public ModelInfo() {
ModelPropties = new List<ModelPropty>();
}
public ModelInfoType Type { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public List<ModelPropty> ModelPropties { get; set; }
public string LowCaseName
{
get
{
if (string.IsNullOrEmpty(Name) || Name.Length < 2)
{
return Name;
}
else
{
return Name.Substring(0, 1).ToLower() Name.Substring(1);
}
}
}
public List<string> Package
{
get
{
if (this.ModelPropties.Count == 0)
{
return null;
}
else
{
var result = new List<string>();
foreach (var item in ModelPropties)
{
if (item.Type == "array")//包含arry
{
if (string.IsNullOrEmpty(item.SubType))
{
if (!ServiceAgent.BaseTypes.Contains(item.Type))
{
result.Add(item.Type.Substring(0, 1).ToLower() item.Type.Substring(1));
}
}
else
{
if (!ServiceAgent.BaseTypes.Contains(item.SubType.ToLower()))
{
result.Add(item.SubType.Substring(0, 1).ToLower() item.SubType.Substring(1));
}
}
}
else if (!ServiceAgent.BaseTypes.Contains(item.Type))//基础类型外
{
result.Add(item.Type.Substring(0, 1).ToLower() item.Type.Substring(1));
}
}
return result;
}
}
}
}
public class ModelPropty
{
public string Name { get; set; }
/// <summary>
/// List<....> | 具体类型
/// </summary>
public string Type { get; set; }
/// <summary>
/// 如果是arry,这里是arry的子类,
/// </summary>
public string SubType { get; set; }
/// <summary>
/// 子类描述
/// </summary>
public string SubTypeDes { get; set; }
/// <summary>
/// 类型描述
/// </summary>
public string TypeDes { get; set; }
public string Format { get; set; }
public string Description { get; set; }
public string LowCaseName
{
get
{
if (string.IsNullOrEmpty(Name)|| Name.Length<2)
{
return Name;
}
else
{
return Name.Substring(0, 1).ToLower() Name.Substring(1);
}
}
}
}
4 接下去的事情就简单了,把swagger.json下载到本地,用system.text.json解析拿到swagger.json中的所有model,挨个生成
5 最后调用flutter format {文件夹位置} 将所有生成的model类格式化一遍,如果这里发生错误,手动执行以下命令就大功告成了。
6 最后附上项目地址: https://gitee.com/zzf_1/flutter-model-genrate-swagger
release版本下载地址:https://gitee.com/zzf_1/flutter-model-genrate-swagger/tags 【release版本稍微有点大,但是release版本不需要.net环境,对于专职flutter的开发人员来说这个应该会比较有用】