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SentimentTest.java
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package com.alchemyapi.test;
import com.alchemyapi.api.AlchemyAPI;
import com.alchemyapi.api.*;
import org.xml.sax.SAXException;
import org.w3c.dom.Document;
import java.io.*;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
class SentimentTest {
public static void main(String[] args) throws IOException, SAXException,
ParserConfigurationException, XPathExpressionException {
// Create an AlchemyAPI object.
AlchemyAPI alchemyObj = AlchemyAPI.GetInstanceFromFile("api_key.txt");
// Extract sentiment for a web URL.
Document doc = alchemyObj.URLGetTextSentiment("http://www.techcrunch.com/");
System.out.println(getStringFromDocument(doc));
// Extract sentiment for a text string.
doc = alchemyObj.TextGetTextSentiment(
"That hat is ridiculous, Charles.");
System.out.println(getStringFromDocument(doc));
// Load a HTML document to analyze.
String htmlDoc = getFileContents("data/example.html");
// Extract sentiment for a HTML document.
doc = alchemyObj.HTMLGetTextSentiment(htmlDoc, "http://www.test.com/");
System.out.println(getStringFromDocument(doc));
// Extract entity-targeted sentiment from a HTML document.
AlchemyAPI_NamedEntityParams entityParams = new AlchemyAPI_NamedEntityParams();
entityParams.setSentiment(true);
doc = alchemyObj.TextGetRankedNamedEntities("That Mike Tyson is such a sweetheart.", entityParams);
System.out.println(getStringFromDocument(doc));
// Extract keyword-targeted sentiment from a HTML document.
AlchemyAPI_KeywordParams keywordParams = new AlchemyAPI_KeywordParams();
keywordParams.setSentiment(true);
doc = alchemyObj.TextGetRankedKeywords("That Mike Tyson is such a sweetheart.", keywordParams);
System.out.println(getStringFromDocument(doc));
//Extract Targeted Sentiment from text
AlchemyAPI_TargetedSentimentParams sentimentParams = new AlchemyAPI_TargetedSentimentParams();
sentimentParams.setShowSourceText(true);
doc = alchemyObj.TextGetTargetedSentiment("This car is terrible.", "car", sentimentParams);
System.out.print(getStringFromDocument(doc));
//Extract Targeted Sentiment from url
doc = alchemyObj.URLGetTargetedSentiment("http://techcrunch.com/2012/03/01/keen-on-anand-rajaraman-how-walmart-wants-to-leapfrog-over-amazon-tctv/", "Walmart",sentimentParams);
System.out.print(getStringFromDocument(doc));
//Extract Targeted Sentiment from html
doc = alchemyObj.HTMLGetTargetedSentiment(htmlDoc, "http://www.test.com/", "WujWuj", sentimentParams);
System.out.print(getStringFromDocument(doc));
}
// utility function
private static String getFileContents(String filename)
throws IOException, FileNotFoundException
{
File file = new File(filename);
StringBuilder contents = new StringBuilder();
BufferedReader input = new BufferedReader(new FileReader(file));
try {
String line = null;
while ((line = input.readLine()) != null) {
contents.append(line);
contents.append(System.getProperty("line.separator"));
}
} finally {
input.close();
}
return contents.toString();
}
// utility method
private static String getStringFromDocument(Document doc) {
try {
DOMSource domSource = new DOMSource(doc);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(domSource, result);
return writer.toString();
} catch (TransformerException ex) {
ex.printStackTrace();
return null;
}
}
}