如何下​​载 Leaflet easyPrint 生成的图像使用 HtmlUnit 的按钮?

我正在尝试这样:

public static void main(String[] args) { 
        try{ 
            WebClient webClient = new WebClient(); 
            HtmlPage test = webClient.getPage("http://rowanwins.github.io/leaflet-easyPrint/"); 
            webClient.waitForBackgroundJavaScript(5000); 
 
            final DomElement button = test.getFirstByXPath("/html/body/button"); 
            final InputStream image = button.click().getWebResponse().getContentAsStream(); 
            System.out.println(image); 
 
            File file = new File("/home/josue/Basis/STS4/map.png"); 
            copyInputStreamToFile(image, file); 
        } 
        catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
 
private static void copyInputStreamToFile(InputStream inputStream, File file)  
        throws IOException { 
 
        try (FileOutputStream outputStream = new FileOutputStream(file)) { 
 
            int read; 
            byte[] bytes = new byte[1024]; 
 
            while ((read = inputStream.read(bytes)) != -1) { 
                outputStream.write(bytes, 0, read); 
            } 
        } 
    } 

并获得一个大约 3Kb 的空白 PNG 文件。 让它工作的正确方法是什么?

编辑:我想要完成它的原因是为 Google map 静态 API 找到一个简单的替代方案,我目前已将其部署在正在运行的项目中。

请您参考如下方法:

我无法让它与 HtmlUnit 一起工作,但使用 Selenium 得到了预期的结果,以防其他人对此功能感兴趣:

public class PG1 { 
 
 
    static WebDriver driver; 
 
    public static void main(String[] args) throws InterruptedException { 
        System.setProperty("webdriver.gecko.driver","/Users/home/Downloads/geckodriver"); 
        FirefoxOptions fxProfile = new FirefoxOptions(); 
        fxProfile.setHeadless(true); 
        fxProfile.addPreference("browser.download.folderList",2); 
        fxProfile.addPreference("browser.download.manager.showWhenStarting",false); 
        fxProfile.addPreference("browser.download.dir","/Users/home/Downloads/"); 
        fxProfile.addPreference("browser.helperApps.neverAsk.saveToDisk","image/png"); 
        driver = new FirefoxDriver(fxProfile); 
        String baseUrl = "http://rowanwins.github.io/leaflet-easyPrint/"; 
        driver.get(baseUrl); 
        while(checkForPresenceOfElementByXpath("")) { 
        } 
        System.out.println("Loaded"); 
        driver.findElement(By.xpath("/html/body/button")).click(); 
        while(checkForPresenceOfElementByXpath("")) { 
        } 
        System.out.println("Downloaded"); 
        driver.close(); 
    } 
 
    public static boolean checkForPresenceOfElementByXpath(String xpath){ 
        try{ 
            new WebDriverWait(driver, 5).until(ExpectedConditions.visibilityOfElementLocated(By.xpath("(xpath)[last()]"))); 
            return true; 
        }catch(Exception e){ 
            return false; 
        } 
    } 
} 


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