RUST实战代码：提取网页中的链接

[package]
name = "links-extrack"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
error-chain = "0.12.4"
reqwest = "0.11.12"
select = "0.5.0"
tokio = { version = "1.21.2", features = ["full"] }

use error_chain::error_chain;
use select::document::Document;
use select::predicate::Name;
// 错误处理
error_chain! {
    foreign_links{
        Reqerror(reqwest::Error);
        IoError(std::io::Error);
    }
}
#[tokio::main]
async fn main()->Result<()> {
    let res= reqwest::get("http://www.rust-lang.org/zh-CN/")
        .await?
        .text() // 获取文本
        .await?;
    Document::from(res.as_str())
        // 找到a标签
        .find(Name("a"))
        // 过滤得到带href属性的
        .filter_map(|n| n.attr("href"))
        .for_each(|x| println!("{}", x));
    Ok(())
}