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一文讲解Laravel-snappy如何导出PDF

转载2021-09-01 08:53:2301037
下面由Laravel教程栏目给大家介绍如何使用Laravel-snappy导出PDF,希望对需要的朋友有所帮助!

前言

论坛里有很多关于如何使用 Laravel-snappy 的文章,但是很多都停留在安装、基本示例,对于实际的应用既没有说明用法,也没有解答一些问题和疑惑,因此在此整理一下,权当做个记录吧。

安装

以 ubuntu 为例

1. 执行安装 wkhtmltopdf:

composer require h4cc/wkhtmltopdf-amd64 0.12.x
composer require h4cc/wkhtmltoimage-amd64 0.12.x

顾名思义,分别安装的是 wkhtmltopdf 和 wkhtmltoimage。

2. 复制 wkhtmltopdf 到 ubuntu 可执行命令的目录中

sudo cp vendor/h4cc/wkhtmltoimage-amd64/bin/wkhtmltoimage-amd64 /usr/local/bin/
sudo cp vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64 /usr/local/bin/
//并使其可执行:
sudo chmod +x /usr/local/bin/wkhtmltoimage-amd64 
sudo chmod +x /usr/local/bin/wkhtmltopdf-amd64

3. 安装 laravel-snappy

composer require barryvdh/laravel-snappy

4. 将 ServiceProvider 添加到 config/app.php 中的 providers 数组中

Barryvdh\Snappy\ServiceProvider::class

5. 将 Facades 添加到 config/app.php 中的 aliases 数组中

'PDF' => Barryvdh\Snappy\Facades\SnappyPdf::class,
'SnappyImage' => Barryvdh\Snappy\Facades\SnappyImage::class,

6. 执行生成配置文件

php artisan vendor:publish --provider="Barryvdh\Snappy\ServiceProvider"

可以看到默认的配置文件为 config/snappy.php:

return [
    'pdf' => [
        'enabled' => true,
        'binary'  => env('WKHTML_PDF_BINARY', '/usr/local/bin/wkhtmltopdf'),
        'timeout' => false,
        'options' => [],
        'env'     => [],
    ],
    'image' => [
        'enabled' => true,
        'binary'  => env('WKHTML_IMG_BINARY', '/usr/local/bin/wkhtmltoimage'),
        'timeout' => false,
        'options' => [],
        'env'     => [],
    ],
];

注意,这里有个坑,默认 binary 配置为 /usr/local/bin/wkhtmltopdf 和 /usr/local/bin/wkhtmltoimage,在第一次使用的时候,会报错 /usr/local/bin/wkhtmltopdf不存在,这是因为在 linux 系统下,wkhtmltopdf 和 wkhtmltoimage 的真实路径和名称为:/usr/local/bin/wkhtmltopdf-amd64 和 /usr/local/bin/wkhtmltoimage-amd64。

9fd04814e680ba64faa47e2f0b24460.png

因此,需要把配置信息修改为:

'pdf' => [
        ...
        'binary'  => env('WKHTML_PDF_BINARY', '/usr/local/bin/wkhtmltopdf-amd64'),
        ...
    ],
    'image' => [
        ...
        'binary'  => env('WKHTML_IMG_BINARY', '/usr/local/bin/wkhtmltoimage-amd64'),
        ...
    ],

开始使用

//使用方法1
$pdf = \PDF::loadView('welcome', $data);
return $pdf->download('welcome.pdf');
//使用方法2
$html = '<html><head><meta charset="utf-8"></head><h1>订单id</h1><h2>12346546</h2></html>';
$pdf = \PDF::loadHTML($html);
return $pdf->inline();

很多博客里没有提到,使用方法 1 中,会报这样的错:

The exit status code '1' says something went wrong: stderr: "Loading pages (1/6) [> ] 0% [======> ] 10% QSslSocket: cannot resolve CRYPTO_num_locks QSslSocket: cannot resolve CRYPTO_set_id_callback QSslSocket: cannot resolve CRYPTO_set_locking_callback QSslSocket: cannot resolve sk_free QSslSocket: cannot resolve sk_num QSslSocket: cannot resolve sk_pop_free QSslSocket: cannot resolve sk_value QSslSocket: cannot resolve SSL_library_init QSslSocket: cannot resolve SSL_load_error_strings QSslSocket: cannot resolve SSLv3_client_method QSslSocket: cannot resolve SSLv23_client_method QSslSocket: cannot resolve SSLv3_server_method QSslSocket: cannot resolve SSLv23_server_method QSslSocket: cannot resolve X509_STORE_CTX_get_chain QSslSocket: cannot resolve OPENSSL_add_all_algorithms_noconf QSslSocket: cannot resolve OPENSSL_add_all_algorithms_conf QSslSocket: cannot resolve SSLeay QSslSocket: cannot call unresolved function CRYPTO_num_locks QSslSocket: cannot call unresolved function CRYPTO_set_id_callback QSslSocket: cannot call unresolved function CRYPTO_set_locking_callback QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function sk_num [==================> ] 31% QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_library_init [============================================================] 100% Counting pages (2/6) [============================================================] Object 1 of 1 Resolving links (4/6) [============================================================] Object 1 of 1 Loading headers and footers (5/6) Printing pages (6/6) [> ] Preparing [============================================================] Page 1 of 1 Done Exit with code 1 due to network error: UnknownNetworkError QSslSocket: cannot call unresolved function CRYPTO_num_locks QSslSocket: cannot call unresolved function CRYPTO_set_id_callback QSslSocket: cannot call unresolved function CRYPTO_set_locking_callback " stdout: "" command: /usr/local/bin/wkhtmltopdf-amd64 --lowquality '/tmp/knp_snappy612c3edcdfc855.21787864.html' '/tmp/knp_snappy612c3edcdfce49.80482557.pdf'.

执行:

sudo apt-get update
sudo apt install libssl1.0-dev

修复完成,导出 welcome 页面。

如果使用 save () 方法保存,默认保存到 /public 文件夹下,并且如果文件名相同的情况下,第二次保存会提示文件已经存在。

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