使用firefox浏览器无头模式在内存里渲染页面，然后用selenium操作浏览器并解析截图。需要安装firefox(也支持chrome)，然后下载firefox 驱动 详见：https://github.com/mozilla/geckodriver/releases。下载完成后存放任意路径，然后将代码中的geckoDriver 改为驱动的实际路径即可。

import org.openqa.selenium.*;

import org.openqa.selenium.firefox.FirefoxDriver;

import org.openqa.selenium.firefox.FirefoxOptions;

import org.openqa.selenium.support.ui.ExpectedConditions;

import org.openqa.selenium.support.ui.WebDriverWait;

import sun.misc.BASE64Decoder;

import javax.imageio.ImageIO;

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

import java.util.concurrent.TimeUnit;

/**

* 网页截图

*/

public class WebPageScreenShot {

/**

* fireFox驱动路径

*/

String geckoDriver = "C:\\Program Files\\Python37\\geckodriver.exe";

String type="png";

public void loadPage(String logonUrl,String actionUrl,String resultPath) throws IOException, InterruptedException {

System.setProperty("webdriver.gecko.driver", geckoDriver);//chromedriver服务地址

FirefoxOptions firefoxOptions = new FirefoxOptions();

firefoxOptions.addArguments("-headless");

//firefoxOptions.addArguments("--start-maximized");

//firefoxOptions.addArguments("--start-fullscreen");

firefoxOptions.setHeadless(true);

FirefoxDriver driver = new FirefoxDriver(firefoxOptions); //新建一个WebDriver 的对象，但是new 的是FirefoxDriver的驱动

driver.get(logonUrl);//打开指定的网站

driver.findElement(By.id("J_username")).sendKeys(new String[]{"***"});

driver.findElement(By.id("J_password")).sendKeys(new String[]{"***"});

driver.findElement(By.id("loginBtn")).click();//登录

(new WebDriverWait(driver, 20)).until(ExpectedConditions.presenceOfElementLocated(By.cssSelector(".index-welcome-info")));//检查到登录成功

driver.get(actionUrl);//打开指定的网站

driver.manage().window().setSize(new Dimension(1900, 800));

//driver.manage().window().maximize();

String js1 = "return document.body.clientHeight.toString()";

String js1_result = driver.executeScript(js1) + "";

int height = Integer.parseInt(js1_result);

List files = new ArrayList();

int last_t = 0;

for (int i = 0; i < 20; ) {

int currentHeight = (i * height);

String js = "window.scrollTo(0," + currentHeight + ");";

driver.executeScript(js);

js1 = "return document.body.scrollHeight.toString()+','+document.body.scrollTop.toString()";

js1_result = driver.executeScript(js1) + "";

/**

* real_scroll_h, real_top = js1_result.split(',')[0], js1_result.split(',')[1]

* 22 #real_scroll_h, real_top 是当前滚动条长度和当前滚动条的top，作为是否继续执行的依据，由于存在滚动条向下拉动后会加载新内容的情况，所以需要以下的判断

* 23 #如果这次设置的top成功，则继续滚屏

*/

int real_scroll_h = Integer.parseInt(js1_result.split(",")[0]);

int real_top = Integer.parseInt(js1_result.split(",")[1]);

//#real_scroll_h, real_top 是当前滚动条长度和当前滚动条的top，作为是否继续执行的依据，由于存在滚动条向下拉动后会加载新内容的情况，所以需要以下的判断

if (real_top == currentHeight) {

// #如果这次设置的top成功，则继续滚屏

i++;

files.add(screenshot(driver).getAbsolutePath());

last_t = real_top;

} else {

// #如果本次设置失败，看这次的top和上一次记录的top值是否相等，相等则说明没有新加载内容，且已到页面底，跳出循环

if (real_top != last_t) {

last_t = real_top;

} else {

files.add(screenshot(driver).getAbsolutePath());

break;

}

}

}

driver.quit();//退出浏览器

merge(files.toArray(new String[]{}), type, resultPath);

}

private File screenshot(WebDriver driver) throws InterruptedException, IOException {

try {

/**

* WebDriver自带了一个智能等待的方法。

dr.manage().timeouts().implicitlyWait(arg0, arg1)；

Arg0：等待的时间长度，int 类型 ；

Arg1：等待时间的单位 TimeUnit.SECONDS 一般用秒作为单位。

*/

driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

} catch (Exception e) {

e.printStackTrace();

}

Thread.sleep(10000);//等等页面加载完成

/**

* dr.quit()和dr.close()都可以退出浏览器,简单的说一下两者的区别：第一个close，

* 如果打开了多个页面是关不干净的，它只关闭当前的一个页面。第二个quit，

* 是退出了所有Webdriver所有的窗口，退的非常干净，所以推荐使用quit最为一个case退出的方法。

*/

byte[] imageBytes = (byte[]) ((FirefoxDriver) driver).getScreenshotAs(new OutputType() {

public Object convertFromBase64Png(String s) {

try {

return (new BASE64Decoder()).decodeBuffer(s);

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

public Object convertFromPngBytes(byte[] bytes) {

return bytes;

}

});

ByteArrayInputStream bytes = new ByteArrayInputStream(imageBytes);

BufferedImage image = ImageIO.read(bytes);

File file = File.createTempFile((new Random()).nextInt()+"",type);

ImageIO.write(image, "png", file);

return file;

}

/**

* Java拼接多张图片

*

* @param pics

* @param type

* @param dst_pic

* @return

*/

public static boolean merge(String[] pics, String type, String dst_pic) {

int len = pics.length;

if (len < 1) {

System.out.println("pics len < 1");

return false;

}

File[] src = new File[len];

BufferedImage[] images = new BufferedImage[len];

int[][] ImageArrays = new int[len][];

for (int i = 0; i < len; i++) {

try {

src[i] = new File(pics[i]);

images[i] = ImageIO.read(src[i]);

} catch (Exception e) {

e.printStackTrace();

return false;

}

int width = images[i].getWidth();

int height = images[i].getHeight();

ImageArrays[i] = new int[width * height];// 从图片中读取RGB

ImageArrays[i] = images[i].getRGB(0, 0, width, height,

ImageArrays[i], 0, width);

}

int dst_height = 0;

int dst_width = images[0].getWidth();

for (int i = 0; i < images.length; i++) {

dst_width = dst_width > images[i].getWidth() ? dst_width

: images[i].getWidth();

dst_height += images[i].getHeight();

}

if (dst_height < 1) {

System.out.println("dst_height < 1");

return false;

}

// 生成新图片

try {

// dst_width = images[0].getWidth();

BufferedImage ImageNew = new BufferedImage(dst_width, dst_height,

BufferedImage.TYPE_INT_RGB);

int height_i = 0;

for (int i = 0; i < images.length; i++) {

ImageNew.setRGB(0, height_i, dst_width, images[i].getHeight(),

ImageArrays[i], 0, dst_width);

height_i += images[i].getHeight();

}

File outFile = new File(dst_pic);

ImageIO.write(ImageNew, type, outFile);// 写图片

} catch (Exception e) {

e.printStackTrace();

return false;

}finally {

/*

删除临时文件

*/

for(String tempFile:pics){

File t=new File(tempFile);

t.delete();

}

}

return true;

}

public static void main(String[] args) throws IOException, InterruptedException {

WebPageScreenShot screenShot=new WebPageScreenShot();

screenShot.loadPage("******","*******","D:\\TEST.png");

}

}

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

com.sinitek.aim

java-selenium

1.0-SNAPSHOT

log4j

log4j

1.2.17

org.seleniumhq.selenium

selenium-java

3.141.59