Java tutorial
/** * License Agreement for OpenSearchServer * * Copyright (C) 2013 Emmanuel Keller / Jaeksoft * * http://www.open-search-server.com * * This file is part of OpenSearchServer. * * OpenSearchServer is free software: you can redistribute it and/or * modify it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * OpenSearchServer is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with OpenSearchServer. * If not, see <http://www.gnu.org/licenses/>. **/ package com.jaeksoft.searchlib.crawler.web.browser; import java.awt.Rectangle; import java.awt.image.BufferedImage; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.Closeable; import java.io.File; import java.io.IOException; import java.io.StringReader; import java.net.URISyntaxException; import java.net.URL; import java.util.ArrayList; import java.util.Collection; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import java.util.concurrent.TimeUnit; import javax.imageio.ImageIO; import javax.xml.parsers.ParserConfigurationException; import org.apache.commons.collections.CollectionUtils; import org.apache.commons.io.FileUtils; import org.apache.http.client.ClientProtocolException; import org.apache.http.impl.cookie.BasicClientCookie; import org.htmlcleaner.XPatherException; import org.openqa.selenium.By; import org.openqa.selenium.Cookie; import org.openqa.selenium.Dimension; import org.openqa.selenium.JavascriptExecutor; import org.openqa.selenium.NoSuchElementException; import org.openqa.selenium.OutputType; import org.openqa.selenium.TakesScreenshot; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebDriver.Timeouts; import org.openqa.selenium.WebElement; import org.openqa.selenium.interactions.Action; import org.openqa.selenium.interactions.Actions; import org.xml.sax.SAXException; import com.google.common.base.Charsets; import com.google.common.io.Resources; import com.jaeksoft.searchlib.Logging; import com.jaeksoft.searchlib.SearchLibException; import com.jaeksoft.searchlib.crawler.web.database.CookieItem; import com.jaeksoft.searchlib.crawler.web.spider.HtmlArchiver; import com.jaeksoft.searchlib.crawler.web.spider.HttpDownloader; import com.jaeksoft.searchlib.script.commands.Selectors.Selector; import com.jaeksoft.searchlib.util.IOUtils; public abstract class BrowserDriver<T extends WebDriver> implements Closeable { protected final BrowserDriverEnum type; protected T driver = null; protected BrowserDriver(BrowserDriverEnum type) { this.type = type; driver = initialize(); } protected abstract T initialize(); @Override public void close() throws IOException { if (driver == null) return; driver.quit(); driver = null; } final public void get(String sUrl) { driver.get(sUrl); } public BrowserDriverEnum getType() { return type; } public Object javascript(String javascript, boolean faultTolerant, Object... objects) throws IOException, SearchLibException { try { if (!(driver instanceof JavascriptExecutor)) throw new IOException("The Web driver does not support javascript execution"); JavascriptExecutor js = (JavascriptExecutor) driver; return js.executeScript(javascript, objects); } catch (IOException e) { if (!faultTolerant) throw e; Logging.warn(e); } catch (Exception e) { if (!faultTolerant) throw new SearchLibException(e); Logging.warn(e); } return null; } public List<?> getElementByTag(String tag, boolean faultTolerant) throws IOException, SearchLibException { List<?> result = (List<?>) javascript("return document.getElementsByTagName(arguments[0])", faultTolerant, tag); return result; } public String getJavascriptInnerHtml() throws IOException, SearchLibException { String source = (String) javascript("document.getElementsByTagName('body')[0].innerHTML", false); return source; } private static String XPATH_SCRIPT = null; private final synchronized static String getXPath() throws IOException { if (XPATH_SCRIPT != null) return XPATH_SCRIPT; URL url = Resources.getResource("/com/jaeksoft/searchlib/crawler/web/browser/get_xpath.js"); String content = Resources.toString(url, Charsets.UTF_8); BufferedReader br = new BufferedReader(new StringReader(content)); StringBuilder sb = new StringBuilder(); String line; while ((line = br.readLine()) != null) sb.append(line.trim()); br.close(); XPATH_SCRIPT = sb.toString(); return XPATH_SCRIPT; } public String getXPath(WebElement webElement, boolean faultTolerant) throws IOException, SearchLibException { String xPath = (String) javascript(getXPath(), faultTolerant, webElement); if (xPath == null) Logging.warn("XPATH extraction failed on " + webElement); return xPath; } final public BufferedImage getScreenshot() throws IOException { if (!(driver instanceof TakesScreenshot)) throw new IOException("This browser driver does not support screenshot"); TakesScreenshot takesScreenshot = (TakesScreenshot) driver; byte[] data = takesScreenshot.getScreenshotAs(OutputType.BYTES); return ImageIO.read(new ByteArrayInputStream(data)); } final public Rectangle getRectangle(WebElement element) { if (element == null) return null; Rectangle box = new Rectangle(element.getLocation().x, element.getLocation().y, element.getSize().width, element.getSize().height); return box; } public String getSourceCode() throws IOException, SearchLibException { return driver.getPageSource(); } final public String getSourceCode(String sUrl) { get(sUrl); return driver.getPageSource(); } final public String getJavascriptBody() { try { return driver.findElement(By.tagName("body")).getText(); } catch (NoSuchElementException e) { return null; } } final public String getTitle() { return driver.getTitle(); } final public String getTitle(String sUrl) { get(sUrl); return driver.getTitle(); } final public void setSize(int width, int height) throws SearchLibException { driver.manage().window().setSize(new Dimension(width, height)); } final public void setTimeouts(Integer pageLoad, Integer script) { Timeouts timeOuts = driver.manage().timeouts(); timeOuts.pageLoadTimeout(pageLoad, TimeUnit.SECONDS); timeOuts.setScriptTimeout(script, TimeUnit.SECONDS); } final public List<WebElement> locateBy(By by) throws SearchLibException { return driver.findElements(by); } final public int locateBy(By by, Collection<WebElement> elements, boolean faultTolerant) throws SearchLibException { try { List<WebElement> list = driver.findElements(by); if (list == null) return 0; elements.addAll(list); return list.size(); } catch (Exception e) { if (!faultTolerant) throw new SearchLibException("Web element location failed: " + by); Logging.warn(e); return 0; } } public final List<WebElement> locateBy(WebElement originElement, By by, boolean faultTolerant) throws SearchLibException { try { if (originElement == null) return null; return originElement.findElements(by); } catch (Exception e) { if (!faultTolerant) throw new SearchLibException("Web element location failed: " + by); Logging.warn(e); return null; } } final public HtmlArchiver saveArchive(HttpDownloader httpDownloader, File parentDirectory, Collection<Selector> selectors) throws ClientProtocolException, IllegalStateException, IOException, SearchLibException, URISyntaxException, SAXException, ParserConfigurationException, ClassCastException, ClassNotFoundException, InstantiationException, IllegalAccessException, XPatherException { URL currentURL = new URL(driver.getCurrentUrl()); StringReader reader = null; try { HtmlArchiver archiver = new HtmlArchiver(this, parentDirectory, httpDownloader, currentURL); Set<WebElement> disableScriptWebElements = new HashSet<WebElement>(); Set<String> xPathDisableScriptSet = new HashSet<String>(); if (selectors != null) for (Selector selector : selectors) if (selector.disableScript) locateBy(selector.getBy(), disableScriptWebElements, true); for (WebElement webElement : disableScriptWebElements) { String xPath = getXPath(webElement, true); if (xPath != null) xPathDisableScriptSet.add(xPath); } archiver.archive(this, xPathDisableScriptSet); return archiver; } finally { IOUtils.close(reader); } } final public String getWindow() { return driver.getWindowHandle(); } final public void switchToWindow(String window) { driver.switchTo().window(window); } final public void switchToFrame(WebElement frameWebelement) { driver.switchTo().frame(frameWebelement); } final public void switchToMain() { driver.switchTo().defaultContent(); } final public void getFrameSource(WebElement frameWebelement, File captureDirectory) throws IOException, SearchLibException { if (!captureDirectory.exists()) captureDirectory.mkdir(); File sourceFile = new File(captureDirectory, "source.html"); switchToFrame(frameWebelement); FileUtils.write(sourceFile, getSourceCode()); switchToMain(); } /** * Click on the given WebElement using Actions * * @param element * @return */ public void click(WebElement element) { Actions builder = new Actions(driver); Action click = builder.moveToElement(element).click(element).build(); click.perform(); } public void switchToLastWindow() { String window = null; Iterator<String> iterator = driver.getWindowHandles().iterator(); while (iterator.hasNext()) window = iterator.next(); driver.switchTo().window(window); } public void openNewWindow() throws IOException, SearchLibException { javascript("window.open()", false); switchToLastWindow(); } public void closeWindow() { driver.close(); } public String getCurrentUrl() { return driver.getCurrentUrl(); } public List<CookieItem> getCookies() { Set<Cookie> cookies = driver.manage().getCookies(); if (CollectionUtils.isEmpty(cookies)) return null; List<CookieItem> cookieList = new ArrayList<CookieItem>(cookies.size()); for (Cookie cookie : cookies) { BasicClientCookie basicCookie = new BasicClientCookie(cookie.getName(), cookie.getValue()); basicCookie.setDomain(cookie.getDomain()); basicCookie.setExpiryDate(cookie.getExpiry()); basicCookie.setPath(cookie.getPath()); basicCookie.setSecure(cookie.isSecure()); cookieList.add(new CookieItem(basicCookie)); } return cookieList; } public WebElement getParent(String tagName, WebElement element) { try { WebElement parent = element.findElement(By.xpath("..")); if (parent == null) return null; if (tagName == null) return parent; if (tagName.equalsIgnoreCase(parent.getTagName())) return parent; return getParent(tagName, parent); } catch (NoSuchElementException e) { Logging.warn(e); return null; } } }