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BugFix: Jsoup 和 HtmlCleaner 构建 Dom 时，若缺失 table 标签，则无法正常解析 tr 和 td 标签。

master
hooyantsing 2023-02-03 22:48:58 +08:00
parent a266df406f
commit 12ce86425f
4 changed files with 60 additions and 20 deletions
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10
webmagic-core/src/main/java/us/codecraft/webmagic/selector/BaseElementSelector.java
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@ -3,6 +3,7 @@ package us.codecraft.webmagic.selector;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import us.codecraft.webmagic.utils.BaseSelectorUtils;
import java.util.ArrayList;
import java.util.List;
@ -13,16 +14,9 @@ import java.util.List;
*/
public abstract class BaseElementSelector implements Selector, ElementSelector {
private Document parse(String text) {
if (text == null) {
return null;
}
// Jsoup could not parse <tr></tr> or <td></td> tag directly
// https://stackoverflow.com/questions/63607740/jsoup-couldnt-parse-tr-tag
if ((text.startsWith("<tr>") && text.endsWith("</tr>"))
|| (text.startsWith("<td>") && text.endsWith("</td>"))) {
text = "<table>" + text + "</table>";
}
text = BaseSelectorUtils.preParse(text);
return Jsoup.parse(text);
}

23
webmagic-core/src/main/java/us/codecraft/webmagic/utils/BaseSelectorUtils.java 100644
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@ -0,0 +1,23 @@
package us.codecraft.webmagic.utils;
/**
* @author hooy
*/
public class BaseSelectorUtils {
/**
* Jsoup/HtmlCleaner could not parse "tr" or "td" tag directly
* https://stackoverflow.com/questions/63607740/jsoup-couldnt-parse-tr-tag
*
* @param text - the html string
* @return text
*/
public static String preParse(String text) {
if (((text.startsWith("<tr>") || text.startsWith("<tr ")) && text.endsWith("</tr>"))
|| ((text.startsWith("<td>") || text.startsWith("<td ")) && text.endsWith("</td>"))) {
text = "<table>" + text + "</table>";
}
return text;
}
}

24
webmagic-saxon/src/main/java/us/codecraft/webmagic/selector/Xpath2Selector.java
View File

@ -8,6 +8,7 @@ import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
@ -29,6 +30,7 @@ import org.w3c.dom.NodeList;
import net.sf.saxon.lib.NamespaceConstant;
import net.sf.saxon.xpath.XPathEvaluator;
import us.codecraft.webmagic.utils.BaseSelectorUtils;
/**
* 支持xpath2.0的选择器。包装了HtmlCleaner和Saxon HE。<br>
@ -111,14 +113,11 @@ public class Xpath2Selector implements Selector {
@Override
public String select(String text) {
try {
HtmlCleaner htmlCleaner = new HtmlCleaner();
TagNode tagNode = htmlCleaner.clean(text);
Document document = new DomSerializer(new CleanerProperties()).createDOM(tagNode);
Object result;
try {
result = xPathExpression.evaluate(document, XPathConstants.NODESET);
result = xPathExpression.evaluate(parse(text), XPathConstants.NODESET);
} catch (XPathExpressionException e) {
result = xPathExpression.evaluate(document, XPathConstants.STRING);
result = xPathExpression.evaluate(parse(text), XPathConstants.STRING);
}
if (result instanceof NodeList) {
NodeList nodeList = (NodeList) result;
@ -147,14 +146,11 @@ public class Xpath2Selector implements Selector {
public List<String> selectList(String text) {
List<String> results = new ArrayList<String>();
try {
HtmlCleaner htmlCleaner = new HtmlCleaner();
TagNode tagNode = htmlCleaner.clean(text);
Document document = new DomSerializer(new CleanerProperties()).createDOM(tagNode);
Object result;
try {
result = xPathExpression.evaluate(document, XPathConstants.NODESET);
result = xPathExpression.evaluate(parse(text), XPathConstants.NODESET);
} catch (XPathExpressionException e) {
result = xPathExpression.evaluate(document, XPathConstants.STRING);
result = xPathExpression.evaluate(parse(text), XPathConstants.STRING);
}
if (result instanceof NodeList) {
NodeList nodeList = (NodeList) result;
@ -179,4 +175,12 @@ public class Xpath2Selector implements Selector {
}
return results;
}
private Document parse(String text) throws ParserConfigurationException {
// HtmlCleaner could not parse <tr></tr> or <td></td> tag directly
text = BaseSelectorUtils.preParse(text);
HtmlCleaner htmlCleaner = new HtmlCleaner();
TagNode tagNode = htmlCleaner.clean(text);
return new DomSerializer(new CleanerProperties()).createDOM(tagNode);
}
}

19
webmagic-saxon/src/test/java/us/codecraft/webmagic/selector/XpathSelectorTest.java
View File

@ -11,6 +11,9 @@ import org.junit.Assert;
import org.junit.Ignore;
import org.junit.Test;
import us.codecraft.webmagic.Page;
import us.codecraft.webmagic.Spider;
import us.codecraft.webmagic.processor.PageProcessor;
import us.codecraft.xsoup.XPathEvaluator;
import us.codecraft.xsoup.Xsoup;
@ -1385,6 +1388,22 @@ public class XpathSelectorTest {
Assert.assertEquals("http://www.oschina.net/", selectList.get(0));
}
@Ignore("test parse <table> <tr> <td> tag")
@Test
public void htmlCleanerParseTest() {
Spider.create(new RuoxiaPageProcessor()).addUrl("http://www.ruoxia.com/top/dianji/month").thread(1).run();
}
class RuoxiaPageProcessor implements PageProcessor {
@Override
public void process(Page page) {
List<Selectable> nodes = page.getHtml().xpath("//div[@class=\"bd\"]//tbody/tr").nodes();
for (Selectable node:nodes) {
String name = node.xpath("//td[3]/div/a[1]/text()").get();
System.out.println(name);
}
}
}
@Ignore("take long time")
@Test
public void performanceTest() {