1 はじめに
前回の記事ではクロールの記事を紹介しましたが、この記事ではホン兄弟が画像をクロールしてローカル コンピューターに保存する方法を簡単に紹介します。インターネット上には美しい壁紙や美女、美少女がたくさんありますが、自分用に集めたい場合、1つずつ保存するのは手間がかかるので、クローラーを使って一括ダウンロードすることができます。
2. 爬虫類原理
実はこれは前の記事と同じで、ホン兄弟はもう一度同じことを繰り返しています。Jmeter のクローラーの原理は実際には非常に単純で、Web ページにリクエストを送信し、返されたすべての href を抽出し、ForEach コントローラーを使用して URL トラバーサルを実装することです。この説明は非常にわかりやすいですか？ホン兄弟は以下にその操作方法を簡単に紹介します。
3. ナイフの小さなテスト
ホン兄弟は写真ウェブサイトを例として、友人や子供たちにプロセスと手順を説明します。
このウェブサイトは動的です。ウェブサイト：https://unsplash.com/
3.1 実戦開始
1. 動的な Web サイトであるため、Web コンテンツを取得しても多くの画像が見つかりません。ブラウザの F12 機能を使用して Web サイトのリクエストを分析し、次のように結論付けます。
Web ページの動的読み込みリクエスト: https://unsplash.com/napi/photos?page=1&per_page=12&order_by=latest。1 は読み込まれるページ数を意味し、12 は毎回 12 枚の画像が読み込まれることを意味します。
画像のダウンロード リクエスト: https://unsplash.com/photos/xxx/download?force=true、xxx は各画像の ID を表します。
2. Web サイト上の画像をクロールするために jmeter を使用し始めました。以下の図に示すように、Jemter を開き、新しいスレッド グループを作成します。
自動テストを学びたい場合は、一連のビデオをお勧めします。このビデオは、Bilibili によって再生されるネットワーク全体でナンバー 1 の自動テスト チュートリアルであると言えます。同時にオンラインに参加している人の数は 1,000 人に達しました、また、収集してさまざまなチャネルで伝達できるメモもあります。マスター技術コミュニケーション: 798478386
https://www.bilibili.com/video/BV17p4y1B77x/?spm_id_from=333.3373. http リクエスト (sampler->http リクエスト) をスレッド グループに追加します。プロトコルは https です。サーバー名の URL とパスのパスを入力します。パスに 1 をパラメータ化し、1 を ${id} に変更します。 、以下の図に示すように。
4. 以下の図に示すように、パラメータ化されたファイルを追加し、コンポーネント -> CSV データ ファイル設定を構成し、ファイル パス、エンコーディング、変数、区切り文字などを設定します。
5. 次に、イメージ ID を抽出し、強力な正規表現を使用してそれを抽出する必要があります。まず、Web ページのリクエストによって返されたデータを分析しましょう。次の図に示すように、ブラザー ホンは表示結果ツリーを追加し、Jmeter を実行します。
6. 次の図に示すように、結果を返し、貼り付けてフォーマットします。
[{
"id": "nV8K0uguyiw",
"created_at": "2020-07-01T18:52:47-04:00",
"updated_at": "2021-05-23T16:16:03-04:00",
"promoted_at": null,
"width": 10920,
"height": 5880,
"color": "#c0c0c0",
"blur_hash": "LCFrS10evKpc.S0KM_-;^+E1E1%L",
"description": null,
"alt_description": "man in green zip up jacket beside woman in black shirt",
"urls": {
"raw": "https://images.unsplash.com/photo-1593643946890-b5b85ade6451?ixid=MnwxMjA3fDF8MXxhbGx8MXx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1",
"full": "https://images.unsplash.com/photo-1593643946890-b5b85ade6451?crop=entropy\u0026cs=srgb\u0026fm=jpg\u0026ixid=MnwxMjA3fDF8MXxhbGx8MXx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=85",
"regular": "https://images.unsplash.com/photo-1593643946890-b5b85ade6451?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDF8MXxhbGx8MXx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=1080",
"small": "https://images.unsplash.com/photo-1593643946890-b5b85ade6451?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDF8MXxhbGx8MXx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=400",
"thumb": "https://images.unsplash.com/photo-1593643946890-b5b85ade6451?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDF8MXxhbGx8MXx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=200"
},
"links": {
"self": "https://api.unsplash.com/photos/nV8K0uguyiw",
"html": "https://unsplash.com/photos/nV8K0uguyiw",
"download": "https://unsplash.com/photos/nV8K0uguyiw/download",
"download_location": "https://api.unsplash.com/photos/nV8K0uguyiw/download?ixid=MnwxMjA3fDF8MXxhbGx8MXx8fHx8fDJ8fDE2MjE4NDA5ODg"
},
"categories": [],
"likes": 499,
"liked_by_user": false,
"current_user_collections": [],
"sponsorship": {
"impression_urls": ["https://secure.insightexpressai.com/adServer/adServerESI.aspx?script=false\u0026bannerID=8281547\u0026rnd=[timestamp]\u0026gdpr=\u0026gdpr_consent=\u0026redir=https://secure.insightexpressai.com/adserver/1pixel.gif", "https://secure.insightexpressai.com/adServer/adServerESI.aspx?script=false\u0026bannerID=8468538\u0026rnd=[timestamp]\u0026DID=mobADID\u0026redir=https://secure.insightexpressai.com/adserver/1pixel.gif"],
"tagline": "Designed to be the Best",
"tagline_url": "http://www.dell.com/xps",
"sponsor": {
"id": "2DC3GyeqWjI",
"updated_at": "2021-05-24T03:12:03-04:00",
"username": "xps",
"name": "XPS",
"first_name": "XPS",
"last_name": null,
"twitter_username": "Dell",
"portfolio_url": "http://www.dell.com/xps",
"bio": "Designed to be the best, with cutting edge technologies, exceptional build quality, unique materials and powerful features.",
"location": null,
"links": {
"self": "https://api.unsplash.com/users/xps",
"html": "https://unsplash.com/@xps",
"photos": "https://api.unsplash.com/users/xps/photos",
"likes": "https://api.unsplash.com/users/xps/likes",
"portfolio": "https://api.unsplash.com/users/xps/portfolio",
"following": "https://api.unsplash.com/users/xps/following",
"followers": "https://api.unsplash.com/users/xps/followers"
},
"profile_image": {
"small": "https://images.unsplash.com/profile-1600096866391-b09a1a53451aimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=32\u0026w=32",
"medium": "https://images.unsplash.com/profile-1600096866391-b09a1a53451aimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=64\u0026w=64",
"large": "https://images.unsplash.com/profile-1600096866391-b09a1a53451aimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=128\u0026w=128"
},
"instagram_username": "dell",
"total_collections": 0,
"total_likes": 0,
"total_photos": 22,
"accepted_tos": true,
"for_hire": false
}
},
"user": {
"id": "2DC3GyeqWjI",
"updated_at": "2021-05-24T03:12:03-04:00",
"username": "xps",
"name": "XPS",
"first_name": "XPS",
"last_name": null,
"twitter_username": "Dell",
"portfolio_url": "http://www.dell.com/xps",
"bio": "Designed to be the best, with cutting edge technologies, exceptional build quality, unique materials and powerful features.",
"location": null,
"links": {
"self": "https://api.unsplash.com/users/xps",
"html": "https://unsplash.com/@xps",
"photos": "https://api.unsplash.com/users/xps/photos",
"likes": "https://api.unsplash.com/users/xps/likes",
"portfolio": "https://api.unsplash.com/users/xps/portfolio",
"following": "https://api.unsplash.com/users/xps/following",
"followers": "https://api.unsplash.com/users/xps/followers"
},
"profile_image": {
"small": "https://images.unsplash.com/profile-1600096866391-b09a1a53451aimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=32\u0026w=32",
"medium": "https://images.unsplash.com/profile-1600096866391-b09a1a53451aimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=64\u0026w=64",
"large": "https://images.unsplash.com/profile-1600096866391-b09a1a53451aimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=128\u0026w=128"
},
"instagram_username": "dell",
"total_collections": 0,
"total_likes": 0,
"total_photos": 22,
"accepted_tos": true,
"for_hire": false
}
}, {
"id": "rfgR_SbTC40",
"created_at": "2021-05-19T10:35:26-04:00",
"updated_at": "2021-05-24T02:48:01-04:00",
"promoted_at": "2021-05-24T02:48:01-04:00",
"width": 3488,
"height": 5232,
"color": "#595959",
"blur_hash": "LFBM*_nOt6tRt8%Ns:Rj0KtlM{Ri",
"description": null,
"alt_description": "black ceramic mug on table",
"urls": {
"raw": "https://images.unsplash.com/photo-1621434913400-21cc05e8c461?ixid=MnwxMjA3fDB8MXxhbGx8Mnx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1",
"full": "https://images.unsplash.com/photo-1621434913400-21cc05e8c461?crop=entropy\u0026cs=srgb\u0026fm=jpg\u0026ixid=MnwxMjA3fDB8MXxhbGx8Mnx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=85",
"regular": "https://images.unsplash.com/photo-1621434913400-21cc05e8c461?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDB8MXxhbGx8Mnx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=1080",
"small": "https://images.unsplash.com/photo-1621434913400-21cc05e8c461?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDB8MXxhbGx8Mnx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=400",
"thumb": "https://images.unsplash.com/photo-1621434913400-21cc05e8c461?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDB8MXxhbGx8Mnx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=200"
},
"links": {
"self": "https://api.unsplash.com/photos/rfgR_SbTC40",
"html": "https://unsplash.com/photos/rfgR_SbTC40",
"download": "https://unsplash.com/photos/rfgR_SbTC40/download",
"download_location": "https://api.unsplash.com/photos/rfgR_SbTC40/download?ixid=MnwxMjA3fDB8MXxhbGx8Mnx8fHx8fDJ8fDE2MjE4NDA5ODg"
},
"categories": [],
"likes": 9,
"liked_by_user": false,
"current_user_collections": [],
"sponsorship": null,
"user": {
"id": "JF1D9mtlosI",
"updated_at": "2021-05-24T02:57:03-04:00",
"username": "farzadmohamadi",
"name": "Farzad Mohamadi",
"first_name": "Farzad",
"last_name": "Mohamadi",
"twitter_username": null,
"portfolio_url": null,
"bio": null,
"location": null,
"links": {
"self": "https://api.unsplash.com/users/farzadmohamadi",
"html": "https://unsplash.com/@farzadmohamadi",
"photos": "https://api.unsplash.com/users/farzadmohamadi/photos",
"likes": "https://api.unsplash.com/users/farzadmohamadi/likes",
"portfolio": "https://api.unsplash.com/users/farzadmohamadi/portfolio",
"following": "https://api.unsplash.com/users/farzadmohamadi/following",
"followers": "https://api.unsplash.com/users/farzadmohamadi/followers"
},
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"medium": "https://images.unsplash.com/profile-1621171864819-d610eadcd8bdimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=64\u0026w=64",
"large": "https://images.unsplash.com/profile-1621171864819-d610eadcd8bdimage?ixlib=rb-1.2.1\u0026q=80\u0026fm=jpg\u0026crop=faces\u0026cs=tinysrgb\u0026fit=crop\u0026h=128\u0026w=128"
},
"instagram_username": null,
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"total_likes": 12,
"total_photos": 9,
"accepted_tos": true,
"for_hire": false
}
}, {
"id": "cfMW036jByI",
"created_at": "2020-05-06T15:53:04-04:00",
"updated_at": "2021-05-24T01:27:02-04:00",
"promoted_at": "2021-05-24T01:27:02-04:00",
"width": 3456,
"height": 5184,
"color": "#8ca6d9",
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},
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"updated_at": "2021-05-24T03:02:09-04:00",
"username": "hugoclb",
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"twitter_username": "hug0clb",
"portfolio_url": null,
"bio": "ðï¸ Annecy, 74\r\nðð¼ââï¸ 19 Ans, Autodidacte ð· Canon EOS 1200d x 50mm",
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"links": {
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"photos": "https://api.unsplash.com/users/hugoclb/photos",
"likes": "https://api.unsplash.com/users/hugoclb/likes",
"portfolio": "https://api.unsplash.com/users/hugoclb/portfolio",
"following": "https://api.unsplash.com/users/hugoclb/following",
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},
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},
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"total_photos": 39,
"accepted_tos": true,
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}
}, {
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"updated_at": "2021-05-24T00:30:02-04:00",
"promoted_at": "2021-05-24T00:30:02-04:00",
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"description": null,
"alt_description": "strawberry juice in clear drinking glass",
"urls": {
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"regular": "https://images.unsplash.com/photo-1621792907789-666f0e69ea03?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDB8MXxhbGx8NHx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=1080",
"small": "https://images.unsplash.com/photo-1621792907789-666f0e69ea03?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDB8MXxhbGx8NHx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=400",
"thumb": "https://images.unsplash.com/photo-1621792907789-666f0e69ea03?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwxMjA3fDB8MXxhbGx8NHx8fHx8fDJ8fDE2MjE4NDA5ODg\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=200"
},
"links": {
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"html": "https://unsplash.com/photos/ycnvnL4beLo",
"download": "https://unsplash.com/photos/ycnvnL4beLo/download",
"download_location": "https://api.unsplash.com/photos/ycnvnL4beLo/download?ixid=MnwxMjA3fDB8MXxhbGx8NHx8fHx8fDJ8fDE2MjE4NDA5ODg"
},
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"sponsorship": null,
"user": {
"id": "JUx0LN7P8_o",
"updated_at": "2021-05-24T03:11:59-04:00",
"username": "bartoshevicz",
"name": "Adam Bartoszewicz",
"first_name": "Adam",
"last_name": "Bartoszewicz",
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}
}, {
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},
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}, {
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}]6. 上記から返されるものは json 形式であり、最初の ID は画像 ID です。ID を使用してデータを抽出できます ( "id":"(.*?)"。括弧内のデータは抽出する必要があるデータです。以下に示すように:
7. 上の図から、通常の一致の総数は 26 で、画像の総数 12 をはるかに超えているため、他の ID が抽出されていることがわかります。引き続き分析を行ったところ、ユーザーに ID があることがわかりました。この ID は画像の ID ではありません。この ID を使用して画像をダウンロードすると、404 エラーが報告されます。この ID は、只今の通常ルール。データの分析を続けて、ダウンロード リンクを見つけます。各写真は ID を除いて同じです。ユーザーにはそのようなリンクはありません。このリンクを使用してデータを抽出します。「ダウンロード」:「https://unsplash.com 」 /photos/(.* ?)/download . 以下の図に示すように:
8. 上の図から、抽出された一致の合計数は 12 であることがわかります。これは正しいです。したがって、正規エクストラクターを追加し、上記の正規表現を正規エクストラクターに入力する必要があります。-1 を忘れずに入力してください。一致する番号を検索し、一致するものをすべて追加します。以下に示すように、それを抽出します。
9. 以下の図に示すように、サンプラー -> デバッグ サンプラーを追加して、必要なデータが実際に取り出されているかどうかを確認してみましょう。
10. 保存後、Jmeter を実行し、クリックして結果ツリーを表示し、取得したデータを表示します。これは、次の図に示すように、ID が当社によって取得されたことを示します。
11. 次に、次の図に示すように、foreach コントローラーを使用してすべての ID を走査し、コントローラーに変数名を入力する必要があります。これは正規表現の変数名です。
12. 画像をダウンロードするための別の http リクエストを foreach コントローラーの下に追加します。これは、最初に作成した画像のダウンロード リクエストです。設定は、最初の http リクエストと一致しています。式で変数名を使用して、ID をパラメータ化することを忘れないでください。はい、以下に示すように:
13. イメージのダウンロード リクエストを送信した後、Beanshell を使用してイメージをローカルに保存します。次の図に示すように、リクエストの下にポストプロセッサ -> BeanShell PostProcessor を追加し、イメージを保存するスクリプトを作成します。
14. 画像スクリプトを保存するためのリファレンスコードは次のとおりです。
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
Date date = new Date();
date.getDate();
SimpleDateFormat df = new SimpleDateFormat("yyyymmdd-HHmmss");
String formate = df.format(date);
//string name = vars.get("imgid");
byte[] result = prev.getResponseData(); //这个是获取到请求返回的数据，prev是获取上个请求的返回
String file_name = "E:\\photos\\" + formate + ".jpg"; //代表存放文件的位置和文件名
File file = new File(file_name);
FileOutputStream out = new FileOutputStream(file);
out.write(result);
out.close();15. これで、奇跡の瞬間を目撃することができます。操作が完了すると、結果ツリーを参照して実行結果を確認できます。次の図に示すように、ストレージ パスにダウンロードされた写真が表示されます。
4. まとめ
1. ローカルイメージに保存する場合、コード内に記述されたパスを作成する必要があり、コード内で判断された場合は作成されず、そうでない場合は作成されます。
2. 主に、正規表現が本当に必要なデータを抽出しているかどうかを確認します。
3. 注意深い友人は、ここには 12 枚の写真しかないことに気づきましたが、パラメータは 3 回循環して 36 枚の写真が表示されます。何が起こっているのでしょうか? それは、ホン兄弟のスレッド グループが 1 であるため、写真が 12 枚あるからです。
4. 正規表現の使用に習熟している。ここで最も重要なステップは、正規表現を使用して必要なキーデータを抽出することです。
さて、Jmeterクローラーについては以上ですが、実は内容は前回の記事とほぼ同じです。