找人看我的简单代码。我对我正在做的事情相当陌生，并且知道我可能只是在某个地方犯了一个简单的错误。
我正在解析一个通过 http 的 xml 文件，并尝试将与元素关联的文本打印到屏幕上，并创建一个由这些元素中的文本填充的对象。
我可以打印所有元素和相关文本，但对象的字段中都有一个空值。如果我有什么需要更好地解释的，请告诉我。
代码如下：
对象等级：
package com.entities;
public class StageOfLife
{
private String endDate;
private String offerData;
private String offerType;
private String redemption;
private String startDate;
private String termsConditions;
private String title;
private String merchantDescription;
private String merchantLogo;
private String merchantName;
public StageOfLife() {
}
public StageOfLife(String endDate, String offerData, String offerType,
String redemption, String startDate, String termsConditions,
String title, String merchantDescription, String merchantLogo,
String merchantName)
{
// Getters Setters HEre
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append(endDate);
buffer.append("\n");
buffer.append(offerData);
buffer.append("\n");
buffer.append(offerType);
buffer.append("\n");
buffer.append(redemption);
buffer.append("\n");
buffer.append(startDate);
buffer.append("\n");
buffer.append(termsConditions);
buffer.append("\n");
buffer.append(title);
buffer.append("\n");
buffer.append(merchantDescription);
buffer.append("\n");
buffer.append(merchantLogo);
buffer.append("\n");
buffer.append(merchantName);
return buffer.toString();
}
}
这是具有方法和主要的类：
package com.xmlparse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import com.entities.StageOfLife;
public class XmlParserStage
{
Document dom;
DocumentBuilder db;
List<StageOfLife> myStageList;
public XmlParserStage(){
//create a list to hold the StageOfLife objects
myStageList = new ArrayList<StageOfLife>();
}
private void parseXmlFile(){
//get the factory
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
//Using factory get an instance of document builder
db = dbf.newDocumentBuilder();
//parse to get DOM representation of the XML file
dom = db.parse("http:/url/goes/here");
} catch(ParserConfigurationException pce) {
pce.printStackTrace();
} catch(SAXException se) {
se.printStackTrace();
} catch(IOException ioe) {
ioe.printStackTrace();
}
}
private void parseDocument() {
//get the root element
Element docEle = dom.getDocumentElement();
//get a nodelist of elements
NodeList nl = docEle.getElementsByTagName("Offer");
if(nl != null && nl.getLength() > 0) {
for(int i = 0 ; i < nl.getLength(); i++) {
//get the elements
Element solEl = (Element)nl.item(i);
//get the StageOfLife object
StageOfLife sol = getStageOfLife(solEl);
//add it to list
myStageList.add(sol);
}
}
}
/*
take an <offer> element and read the values in, create
an StageOfLife object and return it
*/
private StageOfLife getStageOfLife(Element solEl) {
/*
for each <offer> element get the values
*/
String endDate = getTextValue(solEl,"EndDate");
String offerData = getTextValue(solEl,"OfferData");
String offerType = getTextValue(solEl,"OfferType");
String redemption = getTextValue(solEl,"Redemption");
String startDate = getTextValue(solEl,"StartDate");
String termsConditions = getTextValue(solEl,"TermsConditions");
String title = getTextValue(solEl,"Title");
String merchantDescription = getTextValue(solEl,"MerchantDescription");
String merchantLogo = getTextValue(solEl,"MerchantLogo");
String merchantName = getTextValue(solEl,"MerchantName");
//Create a new StageOfLife object with the value read from the xml nodes
StageOfLife sol = new StageOfLife(endDate, offerData, offerType,
redemption, startDate, termsConditions,
title, merchantDescription, merchantLogo,
merchantName);
return sol;
}
/*
take a xml element and the tag name, look for the tag and get
the text content
*/
private String getTextValue(Element ele, String tagName) {
String textVal = null;
NodeList nl = ele.getElementsByTagName(tagName);
if(nl != null && nl.getLength() > 0) {
Element el = (Element)nl.item(0);
textVal = el.getFirstChild().getNodeValue();
System.out.print(el + ":" + textVal);
System.out.println();
}
return textVal;
}
/*
Calls getTextValue and returns a int value
*/
private int getIntValue(Element ele, String tagName) {
return Integer.parseInt(getTextValue(ele,tagName));
}
private void printData(){
System.out.println("Number of Offers: '" + myStageList.size() + "'.");
Iterator it = myStageList.iterator();
while(it.hasNext()) {
System.out.println(it.next().toString());
}
}
public void run() {
//parse the xml file and get the dom object
parseXmlFile();
//get each stageoflife element and create a StageOfLife object
parseDocument();
//Iterate through the list and print the data
printData();
}
public static void main(String [] args) throws ClientProtocolException, IOException {
XmlParserStage xmlParser = new XmlParserStage();
xmlParser.httpClient();
xmlParser.run();
}
}