为什么使用 Reqwest 的 .text() 方法下载的图像会损坏？答案

【问题标题】：Why are images downloaded with Reqwest's .text() method broken?为什么使用 Reqwest 的 .text() 方法下载的图像会损坏？
【发布时间】：2019-05-07 20:27:49
【问题描述】：

如何在某个网站上检索图像并正确使用 Reqwest 将其保存到本地？我尝试使用.text()，但图像已损坏。

Error interpreting JPEG image file (Not a JPEG file: starts with 0xef 0xbf)

我试过的代码

extern crate reqwest;

use std::error::Error;
use std::fs::File;
use std::io::prelude::*;
use std::path::Path;

fn main() {
    let mut image_file = reqwest::Client::new()
        .get("https://images.pexels.com/photos/2124773/pexels-photo-2124773.jpeg")
        .send()
        .unwrap()
        .text()
        .unwrap();
    let path = Path::new("tmp/img_test.jpeg");
    let display = path.display();
    let mut file = match File::create(&path) {
        Err(why) => panic!("couldn't create {}: {}", display, why.description()),
        Ok(file) => file,
    };
    match file.write_all(image_file.as_bytes()) {
        Err(why) => panic!("couldn't write to {}: {}", display, why.description()),
        Ok(_) => println!("successfully wrote to {}", display),
    }
}

【问题讨论】：

标签： rust reqwest

【解决方案1】：

不要使用text，它用于文本，因此会尝试解码原始字节。

只需编写response，它实现了Into<Body>，其中Body 是一个流（这也比获取字节更有效）：

let mut client = reqwest::Client::new();
let mut image_file = client
    .get("https://images.pexels.com/photos/2124773/pexels-photo-2124773.jpeg")
    .send()
    .unwrap();

let path = Path::new("img_test.jpeg");
let display = path.display();
let mut file = match File::create(&path) {
    Err(why) => panic!("couldn't create {}: {}", display, why.description()),
    Ok(file) => file,
};
match std::io::copy(&mut image_file, &mut file) {
    Err(why) => panic!("couldn't write to {}: {}", display, why.description()),
    Ok(_) => println!("successfully wrote to {}", display),
}

【讨论】：