linux C语言Json封装数据

目的：
java app Tcp客户端发送数据给Linux C 服务器数据解析

验证环境：
首先安装json
安装包链接
链接：https://pan.baidu.com/s/1BDc2JldxTEmmcxwdqesvTw
提取码：54jg

sudo cp tar xvf json-c-0.9.tar.gz /usr/local
cd /usr/local
sudo tar -xvf tar xvf json-c-0.9.tar.gz
cd  xvf json-c-0.9.tar.gz
./configure
make
sudo make install

代码demo如下：

#include 
#include "/usr/local/include/json/json.h"
/*
实现把点菜的信息以json打包与解析：   
【｛"name":"烤土豆"，“price”:20｝，｛"name":"小龙虾","price":300｝】
*/

#include 
#include "/usr/local/include/json/json.h"

int main(int argc, char const *argv[])
{
	//1、创建一个json数组对象，就可以理解为外面那个大容器[]
	struct json_object *arr=json_object_new_array();

	//2、创建两个字符串对象，可以以理解为[]中的两个小容器{}
	struct json_object *str1=json_object_new_object();
	struct json_object *str2=json_object_new_object();

	//3、把要存放的数据转为对象
	struct json_object *value1=json_object_new_string("烤土豆");
	struct json_object *value2=json_object_new_int(20);
	struct json_object *value3=json_object_new_string("小龙虾");
	struct json_object *value4=json_object_new_int(300);

	//4、把数值对象添加到字符串对象中
	json_object_object_add(str1,"name", value1);
	json_object_object_add(str1,"price", value2);
	json_object_object_add(str2,"name", value3);
	json_object_object_add(str2,"price", value4);

	//5、把字符串对象添加到数组对象中
	json_object_array_add(arr,str1);
	json_object_array_add(arr,str2);

	//6、把数组对象转为字符流进行发送
	const char *temp=json_object_to_json_string(arr);
	printf("%s\n",temp);



	//1、把得到的字符流转为数组对象
	arr=json_tokener_parse(temp);

	//2、获取数组指定位置的对象
	str1=json_object_array_get_idx(arr,0);
	str2=json_object_array_get_idx(arr,1);

	//3、在字符串｛｝对象中根据key值找到数值对象
	value1=json_object_object_get(str1,"name");
	value2=json_object_object_get(str1,"price");
	value3=json_object_object_get(str2,"name");
	value4=json_object_object_get(str2,"price");

	//4、数值对象转换为对应的数值
	temp=json_object_get_string(value1);
	int n=json_object_get_int(value2);
	printf("%s : %d\n",temp,n);
	temp=json_object_get_string(value3);
	n=json_object_get_int(value4);
	printf("%s : %d\n",temp,n);

	return 0;
}

来个稍微负载的json对象包含json对象发送如下：

	//创建一个json对象，理解为｛｝，是一个容器
	struct json_object * obj=json_object_new_object();
	struct json_object * member=json_object_new_object();
	//把要存放的数据转为对象
	struct json_object *name_value=json_object_new_string(name);
	struct json_object *passwd_value=json_object_new_string(passwd);
	//把数值对象添加到字符串对象中
	json_object_object_add(obj, USR_NAME, name_value);
	json_object_object_add(obj, USR_PASSWD, passwd_value);
	//member
	struct json_object *mem_cmd=json_object_new_string("1");
	struct json_object *mem_data=json_object_new_string("world");
	json_object_object_add(member, "cmd", mem_cmd);
	json_object_object_add(member, "data", mem_data);
	//在json对象obj里添加“mem”成员member对象
	json_object_object_add(obj, "mem", member);
	//把Json对象转为字符流
	const char *temp=json_object_to_json_string(obj);
	printf("len:%d,dat:%s\n",strlen(temp),temp);

打印结果如下：
{ “usr_name”: “LBJ”, “usr_passwd”: “1”, “mem”: { “cmd”: “1”, “data”: “world” } }