将字节转换为字符串rust

pepwfjgg 于 2023-05-22 发布在其他

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我用这段代码解析http响应，服务器会返回一个json字符串，这是rust代码：

use reqwest::Client;

#[tokio::main]
async fn main() {
    let client = Client::new();
    let url = "https://jsonplaceholder.typicode.com/todos/1";
    let response = client.get(url).send().await;
    if response.is_ok() {
        let wrap_response = response.expect("msg");
        let resp_bytes = wrap_response.bytes().await;
        let json_str = std::str::from_utf8(resp_bytes.unwrap()).unwrap();
        println!("{}", "wrap_response");
    } else {
        println!("Error: {}", response.unwrap_err());
    }
}

这一行let json_str = std::str::from_utf8(resp_bytes.unwrap()).unwrap();显示预期&[u8]，发现Bytes。可以将Bytes转换为String吗？这是我的cargo配置：

[package]
name = "rust-learn"
version = "0.1.0"
edition = "2018"

[dependencies]
num-bigint = "0.2.1"
reqwest = { version = "0.11", features = ["json"] }
tokio = { version = "1.17.0", features = ["full"] }
serde = { version = "1.0.64", features = ["derive"] }
serde_json = "1.0.64"

来自服务器的响应可能看起来像这样：

{
   "result":{
      "id":4,
      "name":"template",
      "remark":"template",
      "created_time":0,
      "updated_time":0,
      "template_status":0,
      "template_id":1,
      "preview_url":"1",
      "template_code":null
   },
   "statusCode":"200",
   "resultCode":"200",
   "msg":"ok"
}

result/statusCode/resultCode/msg不可变，结果数据是动态的。

rust

来源：https://stackoverflow.com/questions/76291614/convert-bytes-to-string-rust

2条答案

按热度按时间

j2datikz1#

由于Bytes实现了Deref<Target = [u8]>，因此可以通过引用获得&[u8]。

std::str::from_utf8(&resp_bytes.unwrap())

但是，这对于reqwest的内置JSON支持来说是多余的。

if response.is_ok() {
    let wrap_response = response.expect("msg");
    let json: serde_json::Value = wrap_response.json().await.expect("Response was not json");
    println!("{:?}", json);
}

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plicqrtu2#

可以将Bytes转换为String吗？这是我的cargo配置：
from_utf8是将字节转换为字符串，问题是将字节转换为字节。Bytes deref'到&[u8]，所以你只需要&它：https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=83c784cd012b5e7db03bf1cf06763464

let json_str = std::str::from_utf8(&resp_bytes.unwrap()).unwrap();

虽然这比必要的要复杂得多，但reqwest::Response有text()和json()两个助手，所以如果你不需要原始字节，你可以直接使用它。
您还可以简化许多错误处理：

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    let url = "https://jsonplaceholder.typicode.com/todos/1";
    let response = client.get(url).send().await;
    match response {
        Ok(r) => {
            // the return type of json() would normally be inferred
            // but I obviously don't have the schema so a generic 
            // value works well enough for now
            let r: serde_json::Value = r.json().await?;
            println!("{:?}", r);
        }
        Err(e) => println!("Error: {}", e)
    }
    Ok(())
}

赞(0）回复(0）举报 2023-05-22

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将字节转换为字符串rust

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