C++基于rapidjson的Json与结构体互相转换

简介

使用rapidjson库进行封装，实现了使用C++对结构体数据和json字符串进行互相转换的功能。最短只需要使用两行代码即可无痛完成结构体数据转换为Json字符串。

支持std::string、数组、POD数据（int,float,double等）、std::vector、嵌套结构体，容器内放结构体等。

优点

1、代码轻量级；仅需引入rapidjson库以及三个头文件即可完成；

2、操作简单；仅需在结构体声明位置注册结构体类型和成员变量；使用时使用提供的序列化和反序列化类接口即可完成转化；使用成员变量名为Json的Key值。

使用示例：

#pragma once
#include 
#include "JsonStructPackage/JsonStructPackageHeader.h"

struct TestStructQQQ
{
	int32_t intTest;
	short shortTest;
	long longTest;
	long long longLongTest;

	float floatTest;
	int32_t unsignedIntTest;

	double doubleTest;

	unsigned long long unsignedLongLongTest;

	std::string tsttr;
};
JSONTRANSLATE(TestStructQQQ, intTest
	, shortTest
	, longTest
	, longLongTest
	, floatTest
	, unsignedIntTest
	, doubleTest
	, unsignedLongLongTest
	, tsttr
	);

struct TestStructA
{
	int32_t ab;
	std::string str;
	double doubleValue;
	float floatValue;

	TestStructQQQ qqq;
	char testChar[64];

	std::vector testVectorStruct;
	std::vector testVectorInt;
	std::vector testVectorStr;

	TestStructA()
	{
		memset(testChar, 0, sizeof(testChar));
	}
};
JSONTRANSLATE(TestStructA, ab
	, str
	, doubleValue
	, floatValue
	, qqq
	, testChar
	, testVectorStruct, testVectorInt, testVectorStr
	);


int32_t main(int32_t argc, char* argv[])
{
	TestStructQQQ testQQQ;

	testQQQ.intTest = 999;
	testQQQ.shortTest = 32765;
	testQQQ.longTest = 65536789;
	testQQQ.longLongTest = 665565345;
	testQQQ.floatTest = 12345.4567;
	testQQQ.unsignedIntTest = 7678;
	testQQQ.doubleTest = 456.67867876;
	testQQQ.unsignedLongLongTest = 1232345678;

	testQQQ.tsttr = "This is TestString!哈哈";

	TestStructA testStruct;
	testStruct.ab = 99;

	testStruct.doubleValue = 123.652432;
	testStruct.floatValue = 99.987;
	testStruct.str = "This is a String";

	testStruct.qqq = testQQQ;

	testStruct.testVectorStruct.emplace_back(testQQQ);
	testStruct.testVectorStruct.emplace_back(testQQQ);

	testStruct.testVectorInt.emplace_back(99);
	testStruct.testVectorInt.emplace_back(55);

	testStruct.testVectorStr.emplace_back("String1");
	testStruct.testVectorStr.emplace_back("String2");

	testStruct.testChar[0] = 'T';
	testStruct.testChar[1] = 'E';
	testStruct.testChar[2] = 'S';
	testStruct.testChar[3] = 'T';

    /**************核心-结构体转Json****************************/
	JsonStructPackager jsonPackage;
	jsonPackage << testStruct;
	std::string resJson = jsonPackage.data();
    /**************核心-结构体转Json****************************/

    /**************核心-Json转结构体****************************/
	JsonStructUnpackager jsonUnpackage(resJson);
	TestStructA unpackageStruct;
	jsonUnpackage >> unpackageStruct;
    /**************核心-Json转结构体****************************/

	return 0;
}

resJson输出如下(经过json格式化后的，直接输出是一个没有换行的字符串)：

resJson : {
    "ab": 99,
    "str": "This is a String",
    "doubleValue": 123.652432,
    "floatValue": 99.98699951171875,
    "qqq": {
        "intTest": 999,
        "shortTest": 32765,
        "longTest": 65536789,
        "longLongTest": 665565345,
        "floatTest": 12345.45703125,
        "unsignedIntTest": 7678,
        "doubleTest": 456.67867876,
        "unsignedLongLongTest": 1232345678,
        "tsttr": "This is TestString!哈哈"
    },
    "testChar": "TEST",
    "testVectorStruct": [
        {
            "intTest": 999,
            "shortTest": 32765,
            "longTest": 65536789,
            "longLongTest": 665565345,
            "floatTest": 12345.45703125,
            "unsignedIntTest": 7678,
            "doubleTest": 456.67867876,
            "unsignedLongLongTest": 1232345678,
            "tsttr": "This is TestString!哈哈"
        },
        {
            "intTest": 999,
            "shortTest": 32765,
            "longTest": 65536789,
            "longLongTest": 665565345,
            "floatTest": 12345.45703125,
            "unsignedIntTest": 7678,
            "doubleTest": 456.67867876,
            "unsignedLongLongTest": 1232345678,
            "tsttr": "This is TestString!哈哈"
        }
    ],
    "testVectorInt": [
        99,
        55
    ],
    "testVectorStr": [
        "String1",
        "String2"
    ]
}