根據swagger.json生成flutter model,暫無空安全支持
一般的服務端類型都有泛型支持,對於flutter來說雖然也支持泛型,但是在序列化這裡卻始終存在問題,flutter不允許用反射,對於flutter項目的開發來說除了畫頁面,可能最煩人的就是跟服務端打交道的時候對對象創建以及序列化,雖然目前網上也有通過json to dart之類的在線工具根據json生成model,但一個項目中那麼多類,都這麼做一遍太費勁,在有上下級類的情況下需要手動去一個個的調整,煩人,於是寫了一個小工具通過 swagger.json 生成flutter model。
1,首先在C#中 我們知道可以的可以生成代碼的有razor模板和T4模板,我是基於.net 5開發的於是就順其自然的使用了當下流行的razor模板來生成代碼
在代碼引入類庫RazorEngine.NetCore
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 就是根據模板生成的最終代碼,代碼量非常少,代碼生成中最主要的地方在於傳入template的model,model中需要定義一個dart類中需要用到的所有信息,
2 template fluttermodel.cshtml
@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 = "";//參數
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("///類型不確定")
@("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:
//判斷類型的
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;//普通對象
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 傳入template的類定義
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))//基礎類型外
{
result.Add(item.Type.Substring(0, 1).ToLower() + item.Type.Substring(1));
}
}
return result;
}
}
}
}
public class ModelPropty
{
public string Name { get; set; }
/// <summary>
/// List<....> | 具體類型
/// </summary>
public string Type { get; set; }
/// <summary>
/// 如果是arry,這裡是arry的子類,
/// </summary>
public string SubType { get; set; }
/// <summary>
/// 子類描述
/// </summary>
public string SubTypeDes { get; set; }
/// <summary>
/// 類型描述
/// </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 接下去的事情就簡單了,把swagger.json下載到本地,用system.text.json解析拿到swagger.json中的所有model,挨個生成
5 最後調用flutter format {文件夾位置} 將所有生成的model類格式化一遍,如果這裡發生錯誤,手動執行以下命令就大功告成了。
6 最後附上項目地址: //gitee.com/zzf_1/flutter-model-genrate-swagger
release版本下載地址://gitee.com/zzf_1/flutter-model-genrate-swagger/tags 【release版本稍微有點大,但是release版本不需要.net環境,對於專職flutter的開發人員來說這個應該會比較有用】