common.js

let request = require("request");
let fs = require("fs");

class Ut {
  /**
	 * 下载网络图片
	 * @param {object} opts 
	 */
  static downImg(opts = {}, path = '') {
    return new Promise((resolve, reject) => {
      request
        .get(opts)
        .on('response', (response) => {
          console.log("img type:", response.headers['content-type'])
        })
        .pipe(fs.createWriteStream(path))
        .on("error", (e) => {
          console.log("pipe error", e)
          resolve('');
        })
        .on("finish", () => {
          console.log("finish");
          resolve("ok");
        })
        .on("close", () => {
          console.log("close");
        })

    })
  };
}

module.exports = Ut;

测试普通网络图片

test.js 下载csdn自己的头像

let Ut = require("./common");

(async () => {
  try {
    let url = "http://avatar.csdn.net/1/A/1/3_zzwwjjdj1.jpg";
    let opts = {
      url: url,
    };
    let path = "./1.jpg";
    let r1 = await Ut.downImg(opts, path);
    console.log(r1);
  }
  catch (e) {
    console.log(e);
  }
})()

运行

测试防盗链图片

http://i.meizitu.net/thumbs/2018/01/117406_24c17_236.jpg

let Ut = require("./common");

(async () => {
  try {
    let url = "http://i.meizitu.net/thumbs/2018/01/117406_24c17_236.jpg";
    let opts = {
      url: url,
    };
    let path = "./2.jpg";
    let r1 = await Ut.downImg(opts, path);
    console.log(r1);
  }
  catch (e) {
    console.log(e);
  }
})()

执行node  test.js得到的不是原图，原图是个妹子图片

这个时候就要分析原网站防盗链的方法，这个网站需要在头部加上 Referer:http://www.mzitu.com/

let Ut = require("./common");

(async () => {
  try {
    let url = "http://i.meizitu.net/thumbs/2018/01/117406_24c17_236.jpg";
    let opts = {
      url: url,
      headers: {
        'Referer': 'http://www.mzitu.com/',
      }
    };
    let path = "./2.jpg";
    let r1 = await Ut.downImg(opts, path);
    console.log(r1);
  }
  catch (e) {
    console.log(e);
  }
})()

再次运行node test.js 就会得到原图

完成。

意外金喜的博客：http://blog.csdn.net/zzwwjjdj1