[Java] java利用phantomjs进行截图实例教程

• selenium
  
• htmlunit
  
• html2image、、、and so on但是这些实现的截图效果都不好。selenium只能实现截屏，不能截取整个页面，而htmlunit、html2image对js的支持效果并不好，截下来的图会有很多空白。phantomjs就是万精油了，既能截取整个页面，对js支持的效果又好
  

brew install phantomjs

/users/hetiantian/softwares/phantomjs/bin/phantomjs
/users/hetiantian/softwares/phantomjs/examples/rasterize.js
https://juejin.im/post/5bb24bafe51d450e4437fd96
/users/hetiantian/desktop/juejin-command.png

/users/hetiantian/softwares/phantomjs/bin/phantomjs：phantomjs可执行文件保存地址
/users/hetiantian/softwares/phantomjs/examples/rasterize.js：rasterize.js文件地址

"use strict";
var page = require('webpage').create(),
 system = require('system'),
 address, output, size, pagewidth, pageheight;
 
if (system.args.length < 3 || system.args.length > 5) {
 console.log('usage: rasterize.js url filename [paperwidth*paperheight|paperformat] [zoom]');
 console.log(' paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "a4", "letter"');
 console.log(' image (png/jpg output) examples: "1920px" entire page, window width 1920px');
 console.log('     "800px*600px" window, clipped to 800x600');
 phantom.exit(1);
} else {
 address = system.args[1];
 output = system.args[2];
 page.viewportsize = { width: 600, height: 600 };
 if (system.args.length > 3 && system.args[2].substr(-4) === ".pdf") {
  size = system.args[3].split('*');
  page.papersize = size.length === 2 ? { width: size[0], height: size[1], margin: '0px' }
       : { format: system.args[3], orientation: 'portrait', margin: '1cm' };
 } else if (system.args.length > 3 && system.args[3].substr(-2) === "px") {
  size = system.args[3].split('*');
  if (size.length === 2) {
   pagewidth = parseint(size[0], 10);
   pageheight = parseint(size[1], 10);
   page.viewportsize = { width: pagewidth, height: pageheight };
   page.cliprect = { top: 0, left: 0, width: pagewidth, height: pageheight };
  } else {
   console.log("size:", system.args[3]);
   pagewidth = parseint(system.args[3], 10);
   pageheight = parseint(pagewidth * 3/4, 10); // it's as good an assumption as any
   console.log ("pageheight:",pageheight);
   page.viewportsize = { width: pagewidth, height: pageheight };
  }
 }
 if (system.args.length > 4) {
  page.zoomfactor = system.args[4];
 }
 page.open(address, function (status) {
  if (status !== 'success') {
   console.log('unable to load the address!');
   phantom.exit(1);
  } else {
   window.settimeout(function () {
  page.render(output);
  phantom.exit();
   }, 200);
  }
 });
}