JarCastingweb-data-extractor
Extracting and parsing structured data with Jquery Selector, XPath or JsonPath from common web format like HTML, XML and JSON.
Implements:
Usage
To add a dependency on Web-Data-Extractor using Maven, use the following:
<dependency>
<groupId>im.nll.data</groupId>
<artifactId>extractor</artifactId>
<version>0.9.6</version>
</dependency>
To add a dependency using Gradle:
dependencies {
compile 'im.nll.data:extractor:0.9.6'
}
Examples
extract single data
String followers = Extractors.on(baseHtml)
.extract(new SelectorExtractor("div.followers"))
.with(new RegexExtractor("\\d+"))
.asString();
or use static method
String followers = Extractors.on(baseHtml)
.extract(selector("div.followers"))
.with(regex("\\d+"))
.asString();
or short string
String followers = Extractors.on(baseHtml)
.extract("selector:div.followers"))
.with(regex("\\d+"))
.asString();
more method
String year = Extractors.on("<div> Talk is cheap. Show me the code. - Fri, 25 Aug 2000 </div>")
.extract(selector("div")) // extract with selector
.filter(value -> value.trim()) // trim result
.with(regex("20\\d{2}")) // get year with regex
.filter(value -> "from " + value) // append 'from' string
.asString();
Assert.assertEquals("from 2000", year);
extract data to map
@Test
public void testToMap() throws Exception {
Map<String, String> dataMap = Extractors.on(baseHtml)
.extract("title", selector("a.title"))
.extract("followers", selector("div.followers")).with(regex("\\d+"))
.extract("description", selector("div.description"))
.asMap();
Assert.assertEquals("fivesmallq", dataMap.get("title"));
Assert.assertEquals("29671", dataMap.get("followers"));
Assert.assertEquals("Talk is cheap. Show me the code.", dataMap.get("description"));
}
extract data to map list
@Test
public void testToMapList() throws Exception {
//split param must implements ListableExtractor
List<Map<String, String>> languages = Extractors.on(listHtml)
.split(selector("tr.item.html"))
.extract("type", selector("td.type"))
.extract("name", selector("td.name"))
.extract("url", selector("td.url"))
.asMapList();
Assert.assertNotNull(languages);
Map<String, String> second = languages.get(1);
Assert.assertEquals(languages.size(), 3);
Assert.assertEquals(second.get("type"), "dynamic");
Assert.assertEquals(second.get("name"), "Ruby");
Assert.assertEquals(second.get("url"), "https://www.ruby-lang.org");
}
extract data to bean
@Test
public void testToBean() throws Exception {
Base base = Extractors.on(baseHtml)
.extract("title", selector("a.title"))
.extract("followers", selector("div.followers")).with(regex("\\d+"))
.extract("description", selector("div.description"))
.asBean(Base.class);
Assert.assertEquals("fivesmallq", base.getTitle());
Assert.assertEquals("29671", base.getFollowers());
Assert.assertEquals("Talk is cheap. Show me the code.", base.getDescription());
}
extract data to bean list
@Test
public void testToBeanList() throws Exception {
List<Language> languages = Extractors.on(listHtml)
.split(selector("tr.item.html"))
.extract("type", selector("td.type"))
.extract("name", selector("td.name"))
.extract("url", selector("td.url"))
.asBeanList(Language.class);
Assert.assertNotNull(languages);
Language second = languages.get(1);
Assert.assertEquals(languages.size(), 3);
Assert.assertEquals(second.getType(), "dynamic");
Assert.assertEquals(second.getName(), "Ruby");
Assert.assertEquals(second.getUrl(), "https://www.ruby-lang.org");
}
support Embeddable bean
set embeddable field value by embeddable.fieldName
@Test
public void testEmbeddable() {
List<Activity> activities = Extractors.on(base5Xml)
.split(xpath("//ProcessDefinition/activity").removeNamespace())
.extract("name", xpath("//activity/@name"))
.extract("type", xpath("//activity/type/text()"))
.extract("resourceType", xpath("//activity/resourceType/text()"))
.extract("config.encoding", xpath("//activity/config/encoding/text()"))
.extract("config.pollInterval", xpath("//activity/config/pollInterval/text()"))
//if pollInterval is null set to default '5'
.filter(value -> value == null ? value : "5")
.extract("config.compressFile", xpath("//activity/config/compressFile/text()"))
.extract("inputBindings.fileName", xpath("//activity/inputBindings/WriteActivityInputTextClass/fileName/value-of/@select"))
.extract("inputBindings.textContent", xpath("//activity/inputBindings/WriteActivityInputTextClass/textContent/value-of/@select"))
.asBeanList(Activity.class);
Assert.assertNotNull(activities);
Assert.assertEquals(1, activities.size());
Activity activity = activities.get(0);
Assert.assertEquals("Output1", activity.getName());
Assert.assertEquals("com.tibco.plugin.file.FileWriteActivity", activity.getType());
//config
Config config = activity.getConfig();
Assert.assertEquals("text", config.getEncoding());
Assert.assertEquals("None", config.getCompressFile());
Assert.assertEquals("5", config.getPollInterval());
//bind
BindingSpec bindingSpec = activity.getInputBindings();
Assert.assertEquals("$_globalVariables/ns:GlobalVariables/GlobalVariables/OutputLocation", bindingSpec.getFileName());
Assert.assertEquals("$File-Poller/pfx:EventSourceOuputTextClass/fileContent/textContent", bindingSpec.getTextContent());
}
filter
before and after is the global filter.
@Test
public void testToBeanListFilterBeforeAndAfter() throws Exception {
List<Language> languages = Extractors.on(listHtml)
//before and after just process the extract value, then execute the follow filter method.
.before(value -> "|before|" + value)
.after(value -> value + "|after|")
.split(xpath("//tr[@class='item']"))
.extract("type", xpath("//td[1]/text()")).filter(value -> "filter:" + value)
.extract("name", xpath("//td[2]/text()")).filter(value -> "filter:" + value)
.extract("url", xpath("//td[3]/text()")).filter(value -> "filter:" + value)
.asBeanList(Language.class);
Assert.assertNotNull(languages);
Language second = languages.get(1);
Assert.assertEquals(languages.size(), 3);
Assert.assertEquals(second.getType(), "filter:|before|dynamic|after|");
Assert.assertEquals(second.getName(), "filter:|before|Ruby|after|");
Assert.assertEquals(second.getUrl(), "filter:|before|https://www.ruby-lang.org|after|");
}
see Example
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/fivesmallq/web-data-extractor.