RapidJSON 介绍
2024-07-01 15:54:47
1. RapidJSON 介绍
RapidJSON 是一个解析和生成 JSON 的 C++ 库。
无需编译，包含头文件即可使用。
2. RapidJSON 使用
2.1 解析
const char* json = "{""\"stringValue\": \"hello world\",""\"boolTrue\": true,""\"boolFalse\": false,""\"nullValue\": null,""\"intValue\": 3498,""\"floatValue\": 3.14,""\"arrayValue\": [1, 2, 3, 4]""}";// parse jsonDocument document;document.Parse(json);assert(document.IsObject());2.2 查询
2.2.1 查询字符串
// query stringconst char* STRING_VALUE = "stringValue";assert(document.HasMember(STRING_VALUE));assert(document[STRING_VALUE].IsString());std::cout << STRING_VALUE << " = " << document[STRING_VALUE].GetString() << std::endl;2.2.2 查询 Bool 值
// query boolconst char* BOOL_TRUE = "boolTrue";assert(document.HasMember(BOOL_TRUE));assert(document[BOOL_TRUE].IsBool());assert(document[BOOL_TRUE].IsTrue());std::cout << BOOL_TRUE << " = " << std::boolalpha << document[BOOL_TRUE].GetBool() << std::endl;const char* BOOL_FALSE = "boolFalse";assert(document.HasMember(BOOL_FALSE));assert(document[BOOL_FALSE].IsBool());assert(document[BOOL_FALSE].IsFalse());std::cout << BOOL_FALSE << " = " << std::boolalpha << document[BOOL_FALSE].GetBool() << std::endl;2.2.3 判断是否为 Null 值
// query null valueconst char* NULL_VALUE = "nullValue";assert(document.HasMember(NULL_VALUE));std::cout << NULL_VALUE << " = " << (document[NULL_VALUE].IsNull() ? "null" : "?") << std::endl;2.2.4 查询 Int 值
// query int valueconst char* INT_VALUE = "intValue";assert(document.HasMember(INT_VALUE));assert(document[INT_VALUE].IsNumber());assert(document[INT_VALUE].IsInt());assert(document[INT_VALUE].IsInt64());assert(document[INT_VALUE].IsUint());assert(document[INT_VALUE].IsUint64());std::cout << INT_VALUE << "(int) = " << document[INT_VALUE].GetInt() << std::endl;std::cout << INT_VALUE << "(uint) = " << document[INT_VALUE].GetUint() << std::endl;std::cout << INT_VALUE << "(int64) = " << document[INT_VALUE].GetInt64() << std::endl;std::cout << INT_VALUE << "(uint64) = " << document[INT_VALUE].GetUint64() << std::endl;2.2.5 查询 Float 值
// query float valueconst char* FLOAT_VALUE = "floatValue";assert(document.HasMember(FLOAT_VALUE));assert(document[FLOAT_VALUE].IsNumber());assert(document[FLOAT_VALUE].IsFloat());assert(document[FLOAT_VALUE].IsDouble());std::cout << FLOAT_VALUE << "(float) = " << document[FLOAT_VALUE].GetFloat() << std::endl;std::cout << FLOAT_VALUE << "(double) = " << document[FLOAT_VALUE].GetDouble() << std::endl;2.2.6 查询数组
// query arrayconst char* ARRAY_VALUE = "arrayValue";const Value& arrayValue = document[ARRAY_VALUE];assert(arrayValue.IsArray());for (SizeType i = 0; i != arrayValue.Size(); ++i){assert(arrayValue[i].IsInt());std::cout << ARRAY_VALUE << "[" << i << "] = " << arrayValue[i].GetInt() << std::endl;}for (Value::ConstValueIterator iter = arrayValue.Begin(); iter != arrayValue.End(); ++iter){assert(iter->IsInt());std::cout << iter->GetInt() << std::endl;}// Range-based For Loop, C++11 onlyfor (auto& value : arrayValue.GetArray()){assert(value.IsInt());std::cout << value.GetInt() << std::endl;}2.2.7 查询对象
// query objectstatic const char* kTypeNames[] = { "Null", "False", "True", "Object", "Array", "String", "Number" };for (Value::ConstMemberIterator iter = document.MemberBegin(); iter != document.MemberEnd(); ++iter){std::cout << "Type of member " << iter->name.GetString() << " is " << kTypeNames[iter->value.GetType()] << std::endl;}// Range-based For Loop, C++11 onlyfor (auto& member : document.GetObject()){std::cout << "Type of member " << member.name.GetString() << " is " << kTypeNames[member.value.GetType()] << std::endl;}// find memberValue::ConstMemberIterator iter = document.FindMember(STRING_VALUE);if (iter != document.MemberEnd()){std::cout << STRING_VALUE << " = " << iter->value.GetString() << std::endl;}3.完整的例子
#include "rapidjson/document.h"
#include "rapidjson/stringbuffer.h"
#include "rapidjson/writer.h"
#include <iostream>
#include <string>void testQuery()
{using namespace rapidjson;const char* json = "{""\"stringValue\": \"hello world\",""\"boolTrue\": true,""\"boolFalse\": false,""\"nullValue\": null,""\"intValue\": 3498,""\"floatValue\": 3.14,""\"arrayValue\": [1, 2, 3, 4]""}";// parse jsonDocument document;document.Parse(json);assert(document.IsObject());// query stringconst char* STRING_VALUE = "stringValue";assert(document.HasMember(STRING_VALUE));assert(document[STRING_VALUE].IsString());std::cout << STRING_VALUE << " = " << document[STRING_VALUE].GetString() << std::endl;// query boolconst char* BOOL_TRUE = "boolTrue";assert(document.HasMember(BOOL_TRUE));assert(document[BOOL_TRUE].IsBool());assert(document[BOOL_TRUE].IsTrue());std::cout << BOOL_TRUE << " = " << std::boolalpha << document[BOOL_TRUE].GetBool() << std::endl;const char* BOOL_FALSE = "boolFalse";assert(document.HasMember(BOOL_FALSE));assert(document[BOOL_FALSE].IsBool());assert(document[BOOL_FALSE].IsFalse());std::cout << BOOL_FALSE << " = " << std::boolalpha << document[BOOL_FALSE].GetBool() << std::endl;// query null valueconst char* NULL_VALUE = "nullValue";assert(document.HasMember(NULL_VALUE));std::cout << NULL_VALUE << " = " << (document[NULL_VALUE].IsNull() ? "null" : "?") << std::endl;// query int valueconst char* INT_VALUE = "intValue";assert(document.HasMember(INT_VALUE));assert(document[INT_VALUE].IsNumber());assert(document[INT_VALUE].IsInt());assert(document[INT_VALUE].IsInt64());assert(document[INT_VALUE].IsUint());assert(document[INT_VALUE].IsUint64());std::cout << INT_VALUE << "(int) = " << document[INT_VALUE].GetInt() << std::endl;std::cout << INT_VALUE << "(uint) = " << document[INT_VALUE].GetUint() << std::endl;std::cout << INT_VALUE << "(int64) = " << document[INT_VALUE].GetInt64() << std::endl;std::cout << INT_VALUE << "(uint64) = " << document[INT_VALUE].GetUint64() << std::endl;// query float valueconst char* FLOAT_VALUE = "floatValue";assert(document.HasMember(FLOAT_VALUE));assert(document[FLOAT_VALUE].IsNumber());assert(document[FLOAT_VALUE].IsFloat());assert(document[FLOAT_VALUE].IsDouble());std::cout << FLOAT_VALUE << "(float) = " << document[FLOAT_VALUE].GetFloat() << std::endl;std::cout << FLOAT_VALUE << "(double) = " << document[FLOAT_VALUE].GetDouble() << std::endl;// query arrayconst char* ARRAY_VALUE = "arrayValue";const Value& arrayValue = document[ARRAY_VALUE];assert(arrayValue.IsArray());for (SizeType i = 0; i != arrayValue.Size(); ++i){assert(arrayValue[i].IsInt());std::cout << ARRAY_VALUE << "[" << i << "] = " << arrayValue[i].GetInt() << std::endl;}for (Value::ConstValueIterator iter = arrayValue.Begin(); iter != arrayValue.End(); ++iter){assert(iter->IsInt());std::cout << iter->GetInt() << std::endl;}// Range-based For Loop, C++11 onlyfor (auto& value : arrayValue.GetArray()){assert(value.IsInt());std::cout << value.GetInt() << std::endl;}// query objectstatic const char* kTypeNames[] = { "Null", "False", "True", "Object", "Array", "String", "Number" };for (Value::ConstMemberIterator iter = document.MemberBegin(); iter != document.MemberEnd(); ++iter){std::cout << "Type of member " << iter->name.GetString() << " is " << kTypeNames[iter->value.GetType()] << std::endl;}// Range-based For Loop, C++11 onlyfor (auto& member : document.GetObject()){std::cout << "Type of member " << member.name.GetString() << " is " << kTypeNames[member.value.GetType()] << std::endl;}// find memberValue::ConstMemberIterator iter = document.FindMember(STRING_VALUE);if (iter != document.MemberEnd()){std::cout << STRING_VALUE << " = " << iter->value.GetString() << std::endl;}
}void test1()
{// 解析jsonconst char* json = "{\"project\":\"rapidjson\",\"stars\":10}";rapidjson::Document d;d.Parse(json);// 获取值rapidjson::Value& s = d["stars"]; std::cout << "stars: " << s.GetInt() << std::endl;// 设置值s.SetInt(s.GetInt() + 1);// 获取jsonrapidjson::StringBuffer buffer;rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);d.Accept(writer);std::cout << buffer.GetString() << std::endl;
}void test2()
{// 创建jsonrapidjson::Document document;rapidjson::Document::AllocatorType& allocator = document.GetAllocator();rapidjson::Value root(rapidjson::kObjectType);root.AddMember("project", "rapidjson", allocator);root.AddMember("stars", 12, allocator);rapidjson::StringBuffer buffer;rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);root.Accept(writer);std::string reststring = buffer.GetString();std::cout << reststring << std::endl;
}int main(void)
{testQuery();test1();test2(); return 0;
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