java+puppeteer实现html转pdf文件

1. puppeteer是一个无头浏览器，可以模拟访问网站或者生成html源文件，并返回pdf流的组件。

2. puppeteer使用需要预先安装nodejs, nodejs具体步骤如下[安装最新版本nodejs即可]：Node.js安装教程_北忆₯的博客-CSDN博客_nodejs安装教程

3. puppeteer安装具体步骤如下：进入cmd控制台，执行如下命令：npm install -g puppeteer

之后会在如图上对应位置生成 puppeteer安装包。

4. 在puppeteer安装包下直接创建如下2个文件，此2个文件为2种实现方式：

方式1：puppeteer.js  ，表示从对应URL处获取信息，并返回pdf流。具体代码如下：

const puppeteer = require('puppeteer');
const options = process.argv;
var address, types;

(async() => {
if(options.length>=4){
    address=options[2];
    types=options[3];
}

const browser = await puppeteer.launch();
const page = await browser.newPage();


const userAgent = "Mozilla/5.0 (Linux; Android 8.1.0; MI 8 Build/OPM1.171019.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36";
page.setUserAgent(userAgent);

//await page.setViewport({ width: 1920, height: 1080 });

await page.setViewport({ width: 480, height: 800,isMobile: true}); 

await page.goto(address, {waitUntil: 'networkidle2'});
if(types == 'pdf') {
    const pdf = await page.pdf({path: 'd://page.pdf', format: 'A4'});
    await browser.close();
    process.stdout.write(pdf);
}else {
    await browser.close();
}


})();

 方式2：setContent.js  (window系统使用)，表示从html文件获取源文件流，并返回pdf流。具体代码如下：

const puppeteer = require('puppeteer');
var fs = require('fs');
const options = process.argv;
var htmlContent;

(async() => {
htmlFilePath=options[2];

const browser = await puppeteer.launch();
const page = await browser.newPage();


const userAgent = "Mozilla/5.0 (Linux; Android 8.1.0; MI 8 Build/OPM1.171019.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36";
page.setUserAgent(userAgent);

//await page.setViewport({ width: 1920, height: 1080 });

await page.setViewport({ width: 480, height: 800,isMobile: true}); 

//const buff2 = Buffer.from(htmlContent, 'base64')
//const htmlContentResult = buff2.toString('utf-8')

var contentHtml = fs.readFileSync(htmlFilePath, 'utf-8');

//await page.goto('file://d:\test2.html');

await page.setContent(contentHtml);

const pdf = await page.pdf({path: 'page.pdf', format: 'A4'});

await browser.close();

process.stdout.write(pdf);


})();

setContent.js  (linux系统使用)

const puppeteer = require('puppeteer');
var fs = require('fs');
const options = process.argv;
var htmlContent;

(async() => {
    htmlFilePath=options[2];

    const browser = await puppeteer.launch({
        args: ['--no-sandbox', '--disable-setuid-sandbox'],
    });
    const page = await browser.newPage();


    const userAgent = "Mozilla/5.0 (Linux; Android 8.1.0; MI 8 Build/OPM1.171019.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36";
    page.setUserAgent(userAgent);

//await page.setViewport({ width: 1920, height: 1080 });

    await page.setViewport({ width: 1800, height: 1800});

//const buff2 = Buffer.from(htmlContent, 'base64')
//const htmlContentResult = buff2.toString('utf-8')

    var contentHtml = fs.readFileSync(htmlFilePath, 'utf-8');

//await page.goto('file://d:\test2.html');

    await page.setContent(contentHtml);

    const pdf = await page.pdf({path: 'page.pdf', fullPage: true});

    await browser.close();

    process.stdout.write(pdf);


})();

3.  puppeteer.js对应的java调用代码如下：

    public static void parseHtml2Pdf(HttpServletResponse response, String fileName, String puppeteerjs, String webSiteUrl, String types) {
        try {
            Runtime rt = Runtime.getRuntime();
            //Process p = rt.exec("node C:\Users\boshi\Desktop\iview-admin-master\hn.js https://www.baidu.com pdf");
            Process p = rt.exec("node "+puppeteerjs+" "+webSiteUrl+" "+types);
            InputStream is = p.getInputStream();
            BufferedInputStream bf = new BufferedInputStream(is);
            byte[] data = IOUtils.toByteArray(bf);
            fileName = URLEncoder.encode(fileName, "UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename="" + fileName + """);
            response.addHeader("Content-Length", "" + data.length);
            response.setContentType("application/octet-stream;charset=UTF-8");
            OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
            outputStream.write(data);
            outputStream.flush();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

4. setContent.js 对应的java调用代码如下：

  public void parseHtml2Pdf(String htmlFileName) {
        try {
            Runtime rt = Runtime.getRuntime();
            Process p = rt.exec("node " + createPdfJsPath + "setContent.js " + this.getHtmlTempPath(htmlFileName));
            InputStream is = p.getInputStream();
            BufferedInputStream bf = new BufferedInputStream(is);
            byte[] data = IOUtils.toByteArray(bf);
            File file = new File(diseaseControlPdfPath + htmlFileName + ".pdf");
            IOUtils.write(data,new FileOutputStream(file));
        } catch (IOException e) {
            log.error("in parseHtml2Pdf has an error,e is ",e);
        }
    }