我正在开发一个Xml解析应用程序。从浏览器打开URL时，该URL不受信任。没有办法从服务器端纠正它。所以我使用了“trsut anybody”代码。 但我仍然得到一个空指针异常。 请帮我解决一下这个。 Thanx提前
这是我的代码。
public class SitesList {
/** Variables */
private ArrayList<String> From_Currency = new ArrayList<String>();
private ArrayList<String> To_Currency = new ArrayList<String>();
private ArrayList<String> exrt_buy = new ArrayList<String>();
private ArrayList<String> exrt_sell = new ArrayList<String>();
/** In Setter method default it will return arraylist
* change that to add */
public ArrayList<String> getFrom_Currency() {
return From_Currency;
}
public void setFrom_Currency(String From_Currency) {
this.From_Currency.add(From_Currency);
}
public ArrayList<String> getTo_Currency() {
return To_Currency;
}
public void setTo_Currency(String To_Currency) {
this.To_Currency.add(To_Currency);
}
public ArrayList<String> getexrt_buy() {
return exrt_buy;
}
public void setexrt_buy(String exrt_buy) {
this.exrt_buy.add(exrt_buy);
}
public ArrayList<String> getexrt_sell() {
return exrt_sell;
}
public void setexrt_sell(String exrt_sell) {
this.exrt_sell.add(exrt_sell);
}
}
MyXMLHandler类
public class MyXMLHandler extends DefaultHandler {
Boolean currentElement = false;
String currentValue = null;
public static SitesList sitesList = null;
public static SitesList getSitesList() {
return sitesList;
}
public static void setSitesList(SitesList sitesList) {
MyXMLHandler.sitesList = sitesList;
}
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
currentElement = true;
if (localName.equals("DOC"))
{
sitesList = new SitesList();
}
/*} else if (localName.equals("website")) {
String attr = attributes.getValue("category");
sitesList.setCategory(attr);
}*/
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
currentElement = false;
if (localName.equalsIgnoreCase("From_Currency"))
sitesList.setFrom_Currency(currentValue);
else if (localName.equalsIgnoreCase("To_Currency"))
sitesList.setTo_Currency(currentValue);
else if (localName.equalsIgnoreCase("exrt_buy"))
sitesList.setexrt_buy(currentValue);
else if (localName.equalsIgnoreCase("exrt_sell"))
sitesList.setexrt_sell(currentValue);
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if (currentElement) {
currentValue = new String(ch, start, length);
currentElement = false;
}
}
}
XMLParsingExample类
public class XMLParsingExample extends Activity {
/** Create Object For SiteList Class */
SitesList sitesList = null;
URL url;
HttpsURLConnection https;
HttpURLConnection conn = null;
final static HostnameVerifier DO_NOT_VERIFY = new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {
return true;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
try {
url = new URL("https://222.165.187.91/ex_rate/XML_LOLC_EXRT.xml");
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
if (url.getProtocol().toLowerCase().equals("https")) {
trustAllHosts();
try {
https = (HttpsURLConnection) url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
https.setHostnameVerifier(DO_NOT_VERIFY);
conn = https;
} else {
try {
conn = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
}
/** Create a new layout to display the view */
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(1);
/** Create a new textview array to display the results */
TextView From_Currency[];
TextView To_Currency[];
TextView exrt_buy[];
TextView exrt_sell[];
try {
/** Handling XML */
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
/** Send URL to parse XML Tags */
URL sourceUrl = new URL("https://222.165.187.91/ex_rate/XML_LOLC_EXRT.xml");
/** Create handler to handle XML Tags ( extends DefaultHandler ) */
MyXMLHandler myXMLHandler = new MyXMLHandler();
xr.setContentHandler(myXMLHandler);
xr.parse(new InputSource(sourceUrl.openStream()));
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}
/** Get result from MyXMLHandler SitlesList Object */
sitesList = MyXMLHandler.sitesList;
/** Assign textview array lenght by arraylist size */
From_Currency = new TextView[sitesList.getFrom_Currency().size()];
To_Currency = new TextView[sitesList.getTo_Currency().size()];
exrt_buy = new TextView[sitesList.getexrt_buy().size()];
exrt_sell = new TextView[sitesList.getexrt_sell().size()];
/** Set the result text in textview and add it to layout */
for (int i = 0; i < sitesList.getFrom_Currency().size(); i++) {
From_Currency[i] = new TextView(this);
From_Currency[i].setText("Name = "+sitesList.getFrom_Currency().get(i));
To_Currency[i] = new TextView(this);
To_Currency[i].setText("Website = "+sitesList.getTo_Currency().get(i));
exrt_buy[i] = new TextView(this);
exrt_buy[i].setText("Website Category = "+sitesList.getexrt_buy().get(i));
exrt_sell[i] = new TextView(this);
exrt_sell[i].setText("Website Category = "+sitesList.getexrt_sell().get(i));
layout.addView(From_Currency[i]);
layout.addView(To_Currency[i]);
layout.addView(exrt_buy[i]);
layout.addView(exrt_sell[i]);
}
/** Set the layout view to display */
setContentView(layout);
}
private void trustAllHosts() {
// Create a trust manager that does not validate certificate chains
TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return new java.security.cert.X509Certificate[] {};
}
@Override
public void checkClientTrusted(
java.security.cert.X509Certificate[] arg0, String arg1)
throws java.security.cert.CertificateException {
// TODO Auto-generated method stub
}
@Override
public void checkServerTrusted(
java.security.cert.X509Certificate[] arg0, String arg1)
throws java.security.cert.CertificateException {
// TODO Auto-generated method stub
}
} };
// Install the all-trusting trust manager
try {
SSLContext sc = SSLContext.getInstance("TLS");
sc.init(null, trustAllCerts, new java.security.SecureRandom());
HttpsURLConnection
.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (Exception e) {
e.printStackTrace();
}
}
}