UE5 读写本地JSON，发送HTTP请求（get）
json
适用于现代 C++ 的 JSON。
项目地址：https://gitcode.com/gh_mirrors/js/json
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UE5 读写本地JSON，发送HTTP请求（get）
没有使用插件，就用UE提供的库开发（推荐使用插件VaRest在虚幻商城里有）
PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "HeadMountedDisplay", "EnhancedInput" ,"Json","JsonUtilities","HTTP","HttpServer"});
读写本地JSON
USTRUCT(BlueprintType)
struct FMyJson : public FTableRowBase
{
GENERATED_BODY()
UPROPERTY(EditAnywhere, BlueprintReadWrite, DisplayName="timeStr")
FString TimeStr;
UPROPERTY(EditAnywhere, BlueprintReadWrite, DisplayName="Key1")
TArray<FString> Key1;
UPROPERTY(EditAnywhere, BlueprintReadWrite, DisplayName="Key2")
TArray<FString> Key2;
};
UCLASS(Blueprintable)
class UE_IVREAL_API UMyBlueprintFunctionLibrary : public UBlueprintFunctionLibrary
{
GENERATED_BODY()
public:
UFUNCTION(BlueprintCallable,meta=(WorldContext="WorldContextObject"))
static void GetJSONStr(FString &jsonStr,const UObject* WorldContextObject);
UFUNCTION(BlueprintCallable,meta=(WorldContext="WorldContextObject"))
static void SetJSONStr(FString jsonStr,const UObject* WorldContextObject);
UFUNCTION(BlueprintCallable,meta=(WorldContext="WorldContextObject"))
static void DuJson(FString jsonStr,const UObject* WorldContextObject,FMyJson &OutMyJson);
UFUNCTION(BlueprintCallable,meta=(WorldContext="WorldContextObject"))
static void XieJson(FString &outjsonStr,const UObject* WorldContextObject,FMyJson MyJson);
}
void UMyBlueprintFunctionLibrary::GetJSONStr(FString& jsonStr, const UObject* WorldContextObject)
{
FString RelaPath="JSON/";//相对路径
FString FileName="yyy.json";//Json文件名
FString ResultString;//存放读取结果的字符串
FString AbsolutePath = FPaths::ProjectContentDir() + RelaPath + FileName;
//UE_LOG(LogTemp,Warning,TEXT("%s"),*AbsolutePath);
FFileHelper::LoadFileToString(ResultString, *AbsolutePath);//传入结果字符串和绝对路径
jsonStr=ResultString;
}
void UMyBlueprintFunctionLibrary::SetJSONStr(FString jsonStr, const UObject* WorldContextObject)
{
FString RelaPath="JSON/";//相对路径
FString FileName="yyy.json";//Json文件名
FString AbsolutePath = FPaths::ProjectContentDir() + RelaPath + FileName;
//UE_LOG(LogTemp,Warning,TEXT("%s"),*AbsolutePath);
FFileHelper::SaveStringToFile(jsonStr, *AbsolutePath);//传入结果字符串和绝对路径
}
void UMyBlueprintFunctionLibrary::DuJson(FString jsonStr, const UObject* WorldContextObject,FMyJson &OutMyJson)
{
FMyJson MyJson;
//GetJSONStr(jsonStr,WorldContextObject);
// 创建一个Json 阅读器
TSharedRef<TJsonReader<>> JsonReader = TJsonReaderFactory<TCHAR>::Create(jsonStr);
// 创建一个Json对象
TSharedPtr<FJsonObject> JsonObject;
// 反序列化，将JsonReader里面的数据，传到JsonObject中
FJsonSerializer::Deserialize(JsonReader, JsonObject);
// 读取单体数据(假设Json数据里有：Time，单条数据)
FString timeStr = JsonObject->GetStringField("Time");
MyJson.TimeStr=timeStr;
//UE_LOG(LogTemp,Warning,TEXT("Time= %s"),*timeStr);
// 读取数组数据(假设Json数据里有：Data，数组数据)
TArray<TSharedPtr<FJsonValue>> data = JsonObject->GetArrayField("Data");
for(int i = 0; i < data.Num(); i++)
{
FString dataStr = data[i]->AsObject()->GetStringField("key1");
FString dataStr1 = data[i]->AsObject()->GetStringField("key2");
MyJson.Key1.Add(dataStr);
MyJson.Key2.Add(dataStr1);
//UE_LOG(LogTemp,Warning,TEXT("key1= %s"),*dataStr);
//UE_LOG(LogTemp,Warning,TEXT("key2= %s"),*dataStr1);
}
OutMyJson=MyJson;
}
void UMyBlueprintFunctionLibrary::XieJson(FString &outjsonStr, const UObject* WorldContextObject, FMyJson MyJson)
{
// 声明一个存储Json内容的字符串
FString JsonStr;
//GetJSONStr(JsonStr,WorldContextObject);
// 创建一个Json编写器
TSharedRef<TJsonWriter<TCHAR, TCondensedJsonPrintPolicy<TCHAR>>> JsonWriter = TJsonWriterFactory<TCHAR, TCondensedJsonPrintPolicy<TCHAR>>::Create(&JsonStr);
// 声明Json对象写入开始
JsonWriter->WriteObjectStart();
JsonWriter->WriteValue(TEXT("Time"), MyJson.TimeStr);
// 声明Json数组写入开始
JsonWriter->WriteArrayStart(TEXT("Data"));
for (int i = 0; i < MyJson.Key1.Num(); i++)
{
JsonWriter->WriteObjectStart();
JsonWriter->WriteValue(TEXT("key1"), MyJson.Key1[i]);
JsonWriter->WriteValue(TEXT("key2"), MyJson.Key2[i]);
JsonWriter->WriteObjectEnd();
}
JsonWriter->WriteArrayEnd();
JsonWriter->WriteObjectEnd();
// 停止写入
JsonWriter->Close();
UE_LOG(LogTemp,Warning,TEXT("%s"),*JsonStr);
outjsonStr=JsonStr;
}
发送HTTP请求（get）
这个请求是获取某个位置的天气，并获取返回JSON中的值，读取出来。
apispace
可以先用POSTMan先测试
UCLASS(Blueprintable)
class UE_IVREAL_API UMyBlueprintFunctionLibrary : public UBlueprintFunctionLibrary
{
GENERATED_BODY()
public:
UPROPERTY(EditAnywhere,BlueprintReadOnly)
FString CurrentF;
UPROPERTY(EditAnywhere,BlueprintReadOnly)
FString CurrentTQ;
FHttpServerModule* HttpServerInstance;
UFUNCTION(BlueprintCallable,meta=(WorldContext="WorldContextObject"))
void text();
void RequestComplete(FHttpRequestPtr RequestPtr, FHttpResponsePtr ResponsePtr, bool bIsSuccess);
DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnBossDiedDelegate);
UPROPERTY(BlueprintAssignable,EditAnywhere)
FOnBossDiedDelegate FOK;
};
void UMyBlueprintFunctionLibrary::text()
{
//如果是POST就要传给JSON过去，这里我们是GET
/*FString server_data;
// 创建json
// TSharedRef<TJsonWriter<TCHAR, TCondensedJsonPrintPolicy<TCHAR>>> JsonWriter = TJsonWriterFactory<TCHAR, TCondensedJsonPrintPolicy<TCHAR>>::Create(server_data);
TSharedRef<TJsonWriter<TCHAR, TPrettyJsonPrintPolicy<TCHAR>>> JsonWriter = TJsonWriterFactory<TCHAR, TPrettyJsonPrintPolicy<TCHAR>>::Create(&server_data);
//开启json 写入
JsonWriter->WriteObjectStart();
//写入数据
//JsonWriter->WriteValue("Content-Type", "application/json;charset=UTF-8");
//关闭写入
JsonWriter->WriteObjectEnd();
//关闭Json 写入
JsonWriter->Close();*/
// 创建Http 请求
TSharedRef<IHttpRequest> Request = FHttpModule::Get().CreateRequest();
// 设置请求头
Request->SetHeader("Content-Type","application/json;charset=UTF-8");
Request->SetHeader("X-APISpace-Token","******");//这里要你的Key
Request->SetHeader("Authorization-Type","apikey");
//Request->SetHeader("Host","<calculated when request is sent>");
// 设置请求方式
Request->SetVerb(TEXT("GET"));
// 请求的链接
Request->SetURL("https://eolink.o.apispace.com/456456/weather/v001/now?areacode=101010100"); // 服务端预留的测试接口
// 内容包
//Request->SetContentAsString(server_data);
//UE_LOG(LogTemp,Warning,TEXT("%s"),*server_data);
// 设置回调函数
Request->OnProcessRequestComplete().BindUObject(this, &UMyBlueprintFunctionLibrary::RequestComplete);
// 发送请求
Request->ProcessRequest();
}
void UMyBlueprintFunctionLibrary::RequestComplete(FHttpRequestPtr RequestPtr, FHttpResponsePtr ResponsePtr, bool bIsSuccess)
{
for (FString AllHeader : ResponsePtr->GetAllHeaders())
UE_LOG(LogTemp,Warning,TEXT("%s"),*AllHeader);
UE_LOG(LogTemp,Warning,TEXT("%d"),bIsSuccess);
if (!EHttpResponseCodes::IsOk(ResponsePtr->GetResponseCode())) return;
UE_LOG(LogTemp,Warning,TEXT("%d"),bIsSuccess);
// 获得返回的json数据
TSharedRef<TJsonReader<TCHAR>> JsonReader = TJsonReaderFactory<TCHAR>::Create(ResponsePtr->GetContentAsString());
// 把FString转成TCHAR
TCHAR* serializedChar = ResponsePtr->GetContentAsString().GetCharArray().GetData();
// 解决中文乱码问题，服务端也是utf-8
TCHAR_TO_UTF8(serializedChar);
FString myData(serializedChar);
// 打印信息
//FWHelper::Debug(myData);
// 创建Json对象
TSharedPtr<FJsonObject> JsonObject;
// 反序列化json
bool bIsOk = FJsonSerializer::Deserialize(JsonReader, JsonObject);
// 判断是否反序列化成功
if (bIsOk)
{
FString data = JsonObject->GetStringField("status");
//FWHelper::Debug(data);
UE_LOG(LogTemp,Warning,TEXT("%s"),*data);
UE_LOG(LogTemp,Warning,TEXT("%s"),*myData);
FString OutputString;
TSharedRef<TJsonWriter<TCHAR, TPrettyJsonPrintPolicy<TCHAR>>> Writer = TJsonWriterFactory<TCHAR, TPrettyJsonPrintPolicy<TCHAR>>::Create(&OutputString);
FJsonSerializer::Serialize(JsonObject.ToSharedRef(), Writer); //Serialize：把内存中的对象转为便于存储和传输的数据
//打印
UE_LOG(LogNet, Warning, TEXT("output 1:\n%s"), *OutputString);
TSharedPtr<FJsonObject, ESPMode::ThreadSafe> Object = JsonObject->GetObjectField(TEXT("result"));
TSharedPtr<FJsonObject, ESPMode::ThreadSafe> ObjectField = Object->GetObjectField(TEXT("realtime"));
FString StringField = ObjectField->GetStringField("text");
CurrentTQ=StringField;
FString StringField1 = ObjectField->GetStringField("wind_dir");
CurrentF=StringField1;
UE_LOG(LogNet, Warning, TEXT("output 1:\n%s"), *StringField);
FOK.Broadcast();
}
}
因为是在蓝图函数库，我们需要这样调用
GitHub 加速计划 / js / json
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适用于现代 C++ 的 JSON。
最近提交(Master分支：1 个月前 )
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