概述

在看书的时候，用到了actix-web这个框架的案例。

书里面的版本是1.0，但是我看官网最新都4.4了。

为了抹平这种信息差，所以我决定把官方提供的示例代码过一遍。

核心代码

Cargo.toml

[package]
name = "hello"
version = "0.1.0"
edition = "2021"

[dependencies]
actix-web = "4.4"
env_logger = "0.11"
log = "0.4"

main.rs

use actix_web::{middleware, web, App, HttpRequest, HttpServer};

async fn index(req: HttpRequest) -> &'static str {
    println!("REQ: {req:?}");
    "Hello world!"
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
    log::info!("starting HTTP server at http://192.168.77.129:8000");
    
    let server = HttpServer::new(|| {
        App::new()
            .wrap(middleware::Logger::default())
            .service(web::resource("/index.html").to(|| async {"Hello html!"}))
            .service(web::resource("/").to(index))
    });
    server.bind("0.0.0.0:8000")?
        .run()
        .await
}

运行和访问

http://192.168.77.129:8000/

http://192.168.77.129:8000/index.html

代码解读

引入依赖：

use actix_web::{middleware, web, App, HttpRequest, HttpServer};

首页路由：

• 获取请求信息：index(req: HttpRequest)
• 返回一个纯文本字符串：&'static str

async fn index(req: HttpRequest) -> &'static str {
    println!("REQ: {req:?}");
    "Hello world!"
}

入口方法：

• 定义入口方法：#[actix_web::main]
• 声明入口方法：async fn main() -> std::io::Result<()> {
• 初始化日志：env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
• 记录一个info级别的日志：log::info!("starting HTTP server at http://192.168.77.129:8000");
• 创建服务对象：let server = HttpServer::new(|| {
• 使用日志中间件：.wrap(middleware::Logger::default())
• 挂载路由/index.html：.service(web::resource("/index.html").to(|| async {"Hello html!"}))
• 挂载路由/： .service(web::resource("/").to(index))
• 启动服务：server.bind("0.0.0.0:8000")?

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
    log::info!("starting HTTP server at http://192.168.77.129:8000");
    
    let server = HttpServer::new(|| {
        App::new()
            .wrap(middleware::Logger::default())
            .service(web::resource("/index.html").to(|| async {"Hello html!"}))
            .service(web::resource("/").to(index))
    });
    server.bind("0.0.0.0:8000")?
        .run()
        .await
}