本文介紹了Java.lang.NumberFormatException 錯誤:空字符串 - 匯率應用程序的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
我正在編寫一個程序，它從 http://www 獲取每日匯率.tcmb.gov.tr/kurlar/today.xml 并將它們保存到列表中.這是我的代碼:
I'm writing a program which gets daily exchange rates from http://www.tcmb.gov.tr/kurlar/today.xml and saves them to the List. Here is my code:
public class ParseTheXml {
private List<CurrencyPojo> currencyList;
public void setCurrencyList(List<CurrencyPojo> currencyList) {
this.currencyList = currencyList;
}
public List<CurrencyPojo> getCurrencyList() throws ParserConfigurationException {
currencyList = new ArrayList<CurrencyPojo>();
try {
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
URL url = new URL("http://www.tcmb.gov.tr/kurlar/today.xml");
Document document = builder.parse(url.openStream());
NodeList nodeList = document.getElementsByTagName("Currency");
for (int i = 0; i < nodeList.getLength(); i++) { // d?ngü her currency türü i?in
Element element = (Element) nodeList.item(i);
CurrencyPojo currencyPojoObject = new CurrencyPojo();
currencyPojoObject.setCrossOrder(Integer.parseInt(element.getAttribute("CrossOrder")));
currencyPojoObject.setKod(element.getAttribute("Kod"));
currencyPojoObject.setCurrenyCode(element.getAttribute("CurrencyCode"));
currencyPojoObject.setUnit(Integer.parseInt(element.getElementsByTagName("Unit").item(0).getTextContent()));
currencyPojoObject.setIsim(element.getElementsByTagName("Isim").item(0).getTextContent());
currencyPojoObject.setCurrencyName(element.getElementsByTagName("CurrencyName").item(0).getTextContent());
currencyPojoObject.setForexBuying(Double.parseDouble(element.getElementsByTagName("ForexBuying").item(0).getTextContent()));
currencyPojoObject.setForexSelling(Double.parseDouble(element.getElementsByTagName("ForexSelling").item(0).getTextContent())); // Last 3 codes have Emppty String errors
currencyPojoObject.setBanknoteBuying(Double.parseDouble(element.getElementsByTagName("BanknoteBuying").item(0).getTextContent()));
currencyPojoObject.setBanknoteSelling(Double.parseDouble(element.getElementsByTagName("BanknoteSelling").item(0).getTextContent()));
currencyList.add(currencyPojoObject);
}
} catch (Exception e) {
e.printStackTrace();
}
return currencyList;
}
在獲得 ForexSelling、BanknoteBuying 和 Banknote Selling 值的部分，我得到了
On the part that getting ForexSelling, BanknoteBuying and Banknote Selling values,I get
java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1842)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at javaxmlparseandshow.ParseTheXml.getCurrencyList(ParseTheXml.java:55)
at javaxmlparseandshow.ParseTheXml.main(ParseTheXml.java:75)
有人可以幫我解決這些問題嗎?提前致謝.
Can someone help me to fix these? Thanks in advance.
推薦答案
或者你可以設置0為空的xml字符串
Alternatively you can set 0 to empty xml strings
private double parseDouble(String val){
if(val== null || val.isEmpty())
return 0.0;
else
return Double.parseDouble(val);
}
前:
currencyPojoObject.setForexSelling(parseDouble(element.getElementsByTagName("ForexSelling").item(0).getTextContent()));
這篇關于Java.lang.NumberFormatException 錯誤:空字符串 - 匯率應用程序的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！
【網站聲明】本站部分內容來源于互聯網,旨在幫助大家更快的解決問題，如果有圖片或者內容侵犯了您的權益，請聯系我們刪除處理，感謝您的支持！