开始之前

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# 在Cargo.toml 新增以下依赖
[dependencies]
serde = { version = "1.0.140",features = ["derive"] }
serde_json = "1.0.82"
serde_yaml = "0.8"
serde_urlencoded = "0.7.1"
# 使用yaserde解析xml
yaserde = "0.8.0"
yaserde_derive = "0.8.0"

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use serde::{Deserialize, Serialize};
// 为结构体实现 Serialize(序列化)属性和Deserialize(反序列化)
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Person {
    // 将该字段名称修改为lastname
    #[serde(rename = "lastname")]
    name: String,
    // 反序列化及序列化时忽略该字段(nickname)
    #[serde(skip)]
    nickname: String,
    // 分别设置序列化及反序列化时输出的字段名称
    #[serde(rename(serialize = "serialize_id", deserialize = "derialize_id"))
    id: i32,
    // 为age设置默认值
    #[serde(default)]
    age: i32,
    
}

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use serde_json::{json, Value};
let v:serde_json::Value = json!(
    {
        "x":20.0,
    	"y":15.0
    }
);
println!("x:{:#?},y:{:#?}",v["x"],v["y"]); // x:20.0, y:15.0

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pub struct App {
    #[serde(rename_all = "PascalCase")]
    /// 统一格式化输入、输出字段名称
    ///  #[serde(rename_all = "camelCase")]
    /// #[serde(rename_all = "snake_case")]
    /// #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
    /// 仅设置
    version: String,
    app_name: String,
    host: String,
}