这里有一个误解。 JSON 是一个序列化格式,它始终是一个字符串。您的两个块都是 JSON 并且功能相同。什么json.loads()
是将其反序列化为value可以本地访问和操作。
您可能想使用serde_json::Value https://docs.serde.rs/serde_json/enum.Value.html如果您希望通用地使用此 JSON。
use serde_json::Value;
fn main() {
let input = r#"{"index":0,"name":"AB/CDE/FG/402/test_int4","sts":"on","time":"2021-06-05 03:28:24.044284300 UTC","value":8}"#;
let mut object: Value = serde_json::from_str(input).unwrap();
if let Some(name) = object.get_mut("name") {
*name = "new name".into();
}
println!("{}", object);
}
{"index":0,"name":"new name","sts":"on","time":"2021-06-05 03:28:24.044284300 UTC","value":8}
或者,通常创建一个反映 JSON 预期内容的结构,并通过以下方式反序列化为该类型:serde
:
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug)]
struct Data {
index: i32,
name: String,
sts: String,
time: String,
value: i32
}
fn main() {
let input = r#"{"index":0,"name":"AB/CDE/FG/402/test_int4","sts":"on","time":"2021-06-05 03:28:24.044284300 UTC","value":8}"#;
let mut object: Data = serde_json::from_str(input).unwrap();
object.name = "new name".to_string();
println!("{:#?}", object);
}
Data {
index: 0,
name: "new name",
sts: "on",
time: "2021-06-05 03:28:24.044284300 UTC",
value: 8,
}