MyLibrary.DoExchangeRate.java Source code

Introduction

Here is the source code for MyLibrary.DoExchangeRate.java

Source

/*
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package MyLibrary;

import java.util.List;
import java.util.function.Predicate;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Node;

/**
 *
 * @author anshifafeng
 */
public class DoExchangeRate {

    DoHttpRequest DoHttpRequest1 = new DoHttpRequest();

    /**
     * yahooapi??
     * @param sourceCurrency ???
     * @return doublenull
     * @throws Exception 
     */
    @SuppressWarnings("unchecked")
    public double getExchangeRateByYahooApi(String sourceCurrency) throws Exception {
        String url = "http://finance.yahoo.com/webservice/v1/symbols/allcurrencies/quote";
        String httpResult = DoHttpRequest1.doGet(url, "utf-8", 2);
        Document Document1 = DocumentHelper.parseText(httpResult);
        Element root = Document1.getRootElement();
        List<Node> nodes = root.selectNodes("//resource");
        Predicate<Node> usd = (node) -> node.selectSingleNode("field").getText().equals("USD/" + sourceCurrency);
        Object[] results = nodes.stream().filter(usd).map((node) -> {
            Node n = (Node) node;
            String xmlStr = n.selectSingleNode("field[2]").getText();
            double rate = 1.00 / Double.parseDouble(xmlStr);
            return rate;
        }).toArray();
        Double result = (Double) results[0];
        return result;
    }

}