上一篇：

幾乎所有的項目涉及到報表或者合同處理等，都會跟PDF打交道。

pdf

node.js中，用的比較多的是html-pdf，每週下載量達到8萬多，是比較多了。

html-pdf

這款工具的特點是不光可以通過代碼調用API生成pdf，還提供命令行工具html-pdf來將html文件轉換成pdf文件。

接下來，我們看一下html-pdf的安裝使用。

html-pdf 安裝

<code> npm install -g html-pdf/<code>

由於html-pdf是基於phantomjs的，所以在安裝過程中會自動下載phantomjs。

html-pdf命令行

<code>html-pdf test/businesscard.html businesscard.pdf/<code>

直接運行html-pdf加上源html文件，後面加上pdf文件名就可以生成pdf文件。

創建PDF文件，代碼示例

<code>//引入fs, html-pef模塊
var fs = require('fs');
var pdf = require('html-pdf');
//讀取html文件
var html = fs.readFileSync('./test/businesscard.html', 'utf8');
//參數options, 將PDF format設為letter, 如果是A4,直接將下面代碼中的letter換成A4即可
var options = { format: 'Letter' };

//創建pdf文件
pdf.create(html, options).toFile('./businesscard.pdf', function(err, res) {
  if (err) return console.log(err);
  console.log(res); // { filename: '/app/businesscard.pdf' }
});/<code>

相關API

<code>var pdf = require('html-pdf');
pdf.create(html).toFile([filepath, ]function(err, res){
  console.log(res.filename);
});

pdf.create(html).toStream(function(err, stream){
  stream.pipe(fs.createWriteStream('./foo.pdf'));
});

pdf.create(html).toBuffer(function(err, buffer){
  console.log('This is a buffer:', Buffer.isBuffer(buffer));
});/<code>

HTML中的header 和footer可以直接讀出

html-pdf 可以將html中的header和footer讀出。只要是id為pageHeader或者pageFooter的都可以被識別出來。

<code>
Default header

Header on first page

Header on second page

Header on third page

Header on last page

...
Default footer

Footer on first page

Footer on second page

Footer on last page
/<code>

關於參數options

在調用API pdf.create(html, options).toFile()創建PDF時，這裡面的參數options相當強大，可以傳很多數據。包括之前說的A4格式。

<code>config = {

  // Export options
  "directory": "/tmp",       // The directory the file gets written into if not using .toFile(filename, callback). default: '/tmp'

  // Papersize Options: http://phantomjs.org/api/webpage/property/paper-size.html
  "height": "10.5in",        // allowed units: mm, cm, in, px
  "width": "8in",            // allowed units: mm, cm, in, px
  - or -
  "format": "Letter",        // allowed units: A3, A4, A5, Legal, Letter, Tabloid
  "orientation": "portrait", // portrait or landscape

  // Page options
  "border": "0",             // default is 0, units: mm, cm, in, px
  - or -
  "border": {
    "top": "2in",            // default is 0, units: mm, cm, in, px
    "right": "1in",
    "bottom": "2in",
    "left": "1.5in"
  },

  paginationOffset: 1,       // Override the initial pagination number
  "header": {
    "height": "45mm",
    "contents": '
Author: Marc Bachmann
'
  },
  "footer": {
    "height": "28mm",
    "contents": {
      first: 'Cover page',
      2: 'Second page', // Any page number is working. 1-based index
      default: '{{page}}/{{pages}}', // fallback value
      last: 'Last Page'
    }
  },


  // Rendering options
  "base": "file:///home/www/your-asset-path", // Base path that's used to load files (images, css, js) when they aren't referenced using a host
 

  // Zooming option, can be used to scale images if `options.type` is not pdf
  "zoomFactor": "1", // default is 1

  // File options
  "type": "pdf",             // allowed file types: png, jpeg, pdf
  "quality": "75",           // only used for types png & jpeg

  // Script options
  "phantomPath": "./node_modules/phantomjs/bin/phantomjs", // PhantomJS binary which should get downloaded automatically
  "phantomArgs": [], // array of strings used as phantomjs args e.g. ["--ignore-ssl-errors=yes"]
  "script": '/url',           // Absolute path to a custom phantomjs/>  "timeout": 30000,           // Timeout that will cancel phantomjs, in milliseconds

  // Time we should wait after window load
  // accepted values are 'manual', some delay in milliseconds or undefined to wait for a render event
  "renderDelay": 1000,

  // HTTP Headers that are used for requests
  "httpHeaders": {
    // e.g.
    "Authorization": "Bearer ACEFAD8C-4B4D-4042-AB30-6C735F5BAC8B"
  },

  // To run Node application as Windows service
  "childProcessOptions": {
    "detached": true
  }

  // HTTP Cookies 
  "httpCookies": [
    // e.g.
    {
      "name": "Valid-Cookie-Name", // required
      "value": "Valid-Cookie-Value", // required
      "domain": "localhost",
      "path": "/foo", // required
      "httponly": true,
      "secure": false,
      "expires": (new Date()).getTime() + (1000 * 60 * 60) // e.g. expires in 1 hour
    }
  ]

}/<code>

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關鍵字: Node.js Excel 操作