1、pom

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
</dependency>

2、腳本動态獲取網頁高度

// 設置驅動地(land)址
        System.setProperty("webdriver.chrome.driver", "D:\\apps\\headless\\chromedriver.exe");
        ChromeOptions options = new ChromeOptions();
        // 設置谷歌浏覽器exe文件所在(exist)地(land)址
        options.setBinary("C:\\Users\\qizhan\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe");
        // 這(this)裏是(yes)要(want)執行的(of)命令，如需修改截圖頁面的(of)尺寸，修改--window-size的(of)參數即可
        options.addArguments("--headless", "--disable-gpu", "--window-size=1920,1200", "--ignore-certificate-errors");
        ChromeDriver driver = new ChromeDriver(options);
        // 訪問頁面
        driver.get("http://sina.com.cn");
        //執行腳本
        String js1 = "return document.body.clientHeight.toString()";
        String js1_result = driver.executeScript(js1) + "";
        int height = Integer.parseInt(js1_result);
        driver.manage().window().setSize(new Dimension(830, height + 100));
        // 頁面等待渲染時(hour)長，如果你的(of)頁面需要(want)動态渲染數據的(of)話一(one)定要(want)留出(out)頁面渲染的(of)時(hour)間，單位默認是(yes)秒
        Wait<WebDriver> wait = new WebDriverWait(driver, 3);
        wait.until(new ExpectedCondition<WebElement>() {
            public WebElement apply(WebDriver d) {
                // 等待前台頁面中 id爲(for)“kw”的(of)組件渲染完畢，後截圖
                // 若無需等待渲染，return true即可。 不(No)同頁面視情況設置id
                return d.findElement(By.id("app"));
            }
        });
        // 獲取到(arrive)截圖的(of)文件
        File screenshotFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
        if ((screenshotFile != null) && screenshotFile.exists()) {
            // 截取到(arrive)的(of)圖片存到(arrive)本地(land)
            FileOutputStream out = null;
            FileInputStream in = null;
            try {
                in = new FileInputStream(screenshotFile);
                out = new FileOutputStream("D:\\apps\\headless\\cut1.png");
                byte[] b = new byte[1024];
                while (true) {
                    int temp = in.read(b, 0, b.length);
                    // 如果temp = -1的(of)時(hour)候，說明讀取完畢
                    if (temp == -1) {
                        break;
                    }
                    out.write(b, 0, temp);
                }
            } catch (Exception e) {
                // TODO異常處理
            }
        }