问题
I am trying to parse the values from this LINK, whose xml encoding is like this
<?xml version="1.0" encoding="utf-8"?>
when I tried to get response throws message in logcat as shown
11-19 17:25:13.350: W/System.err(3360): This is not valid URL
11-19 17:25:13.350: W/System.err(3360): java.lang.NullPointerException
When I tried with some other LINK ,whose encoding is like this
<?xml version="1.0" encoding="UTF-8"?> It works fine, I can parse the values.
is xml parsing failing due encoding not being UTF-8,it is utf-8 ??
How should I deal with this. I have done google and am new to XML parsing. This is my first parsing which I am trying to create. Please let me know the way.
updated with code :
public String getXmlFromUrl(String url) {
String xml = null;
try {
// defaultHttpClient
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);
System.out.println("response -- " + xml);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}
回答1:
Straight away it looks like the problem is with Encoding of XML in your response.
URL url = new URL("http://myurl.com");
InputSource is = new InputSource(url.openStream());
is.setEncoding("ISO-8859-1"); // Also Try UTF-8 or UTF-16
BufferedReader br = new BufferedReader(new InputStreamReader(is.getByteStream()));
String line,str;
while((line=br.readLine())!=null)
{
str = str + line;
}
Log.i(TAG,str);
回答2:
Check charset of content type header of the response. It can either be ISO-8859-1 or UTF-8. Encode accordingly.
EDIT : For the link you have provided i did not set any encoding for the response. Since you have mentioned you are new to XML parsing, i am posting my parser implementation.
My Parser:
public final class SampleParser{
final static String ROOT_NODE = "Menus";
final static String ELEMENT_SITEMENU = "SiteMenu";
final static String ELEMENT_ID = "menuID";
final static String ELEMENT_TITLE = "menuTitle";
final static String ELEMENT_CUSTOM = "menuIsCustom";
final static String ELEMENT_PAGE_URL = "menuCustomPageURL";
final static String ELEMENT_IOS_ID = "iosMenuID";
private static final String TAG="SampleParser";
/**
* Intentionally commented
*/
private SampleParser() {}
/**
* @param response The XML string which represents the complete news data
* @return news The complete data
*/
public static Menus parse(String response) {
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp;
try {
sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
SampleDataHandler dataHandler = new SampleDataHandler();
xr.setContentHandler(dataHandler);
InputSource source = new InputSource(new StringReader(response));
xr.parse(source);
Menus result = dataHandler.getData();
return result;
} catch (ParserConfigurationException e) {
Log.e(TAG, "parse", e);
} catch (SAXException e) {
Log.e(TAG, "parse", e);
} catch (IOException e) {
Log.e(TAG, "parse", e);
}
return null;
}
static class SampleDataHandler extends DefaultHandler {
/**
*
*/
private static final String TAG="SampleDataHandler";
/**
*
*/
private Menus data;
/**
*
*/
private SiteMenu tempElement;
/**
*
*/
private boolean readingIosId;
/**
*
*/
private boolean readingTitle;
/**
*
*/
private boolean readingID;
/**
*
*/
private boolean readingCustom;
/**
*
*/
private boolean readingCustomURL;
/**
*
*/
public Menus getData(){
return data;
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.helpers.DefaultHandler#endDocument()
*/
@Override
public void endDocument() throws SAXException {
Log.d(TAG, "endDocument Finished parsing response");
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String,
* java.lang.String, java.lang.String)
*/
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if(qName.equalsIgnoreCase(ELEMENT_SITEMENU)){
data.addMathematician(tempElement);
}else if(qName.equalsIgnoreCase(ELEMENT_ID)){
readingID = false;
}else if(qName.equalsIgnoreCase(ELEMENT_TITLE)){
readingTitle = false;
}else if(qName.equalsIgnoreCase(ELEMENT_IOS_ID)){
readingIosId = false;
}else if(qName.equalsIgnoreCase(ELEMENT_CUSTOM)){
readingCustom = false;
}else if(qName.equalsIgnoreCase(ELEMENT_PAGE_URL)){
readingCustomURL = false;
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.helpers.DefaultHandler#startDocument()
*/
@Override
public void startDocument() throws SAXException {
data = new Menus();
Log.d(TAG, "startDocument Started parsing response");
}
/*
* (non-Javadoc)
*
* @see
* org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String,
* java.lang.String, java.lang.String, org.xml.sax.Attributes)
*/
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if(qName.equalsIgnoreCase(ROOT_NODE)){
//data.setData(new ArrayList<NewsElement>());
}else if(qName.equalsIgnoreCase(ELEMENT_SITEMENU)){
tempElement = new SiteMenu();
}else if(qName.equalsIgnoreCase(ELEMENT_IOS_ID)){
readingIosId = true;
}else if(qName.equalsIgnoreCase(ELEMENT_ID)){
readingID = true;
}else if(qName.equalsIgnoreCase(ELEMENT_TITLE)){
readingTitle = true;
}else if(qName.equalsIgnoreCase(ELEMENT_CUSTOM)){
readingCustom = true;
}else if(qName.equalsIgnoreCase(ELEMENT_PAGE_URL)){
readingCustomURL = true;
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.helpers.DefaultHandler#characters(char[], int, int)
*/
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
String chars = new String(ch, start, length);
chars = chars.trim();
if(readingID){
try{
tempElement.setId(Integer.parseInt(chars));
}catch(Exception e){
Log.e(TAG, "characters[Parsing ID]", e);
tempElement.setId(-1);
}
}
else if(readingIosId){
try{
tempElement.setiOSID(Integer.parseInt(chars));
}catch(Exception e){
Log.e(TAG, "characters[Parsing iOSID]", e);
tempElement.setiOSID(-1);
}
}else if(readingTitle){
tempElement.setTitle(chars);
}else if(readingCustom){
try{
tempElement.setCustom(Boolean.parseBoolean(chars));
}catch(Exception e){
Log.e(TAG, "characters[Parsing custom]", e);
tempElement.setCustom(false);
}
}else if(readingCustomURL){
tempElement.setCustomUrl(chars);
}
}
}
}
My utils methods for network call. [Same as yours]
/**
* @param url
* @return
*/
private static HttpEntity getResponseEntity(String url) {
DefaultHttpClient httpClient = getHttpClient();
HttpGet getMethod = new HttpGet(url);
long startTime= 0;
try {
HttpResponse httpResponse = httpClient.execute(getMethod);
HttpEntity responseEntity = httpResponse.getEntity();
return responseEntity;
} catch (IOException ioe) {
Log.e(TAG, "getResponseEntity", ioe);
} catch (Exception e) {
Log.e(TAG, "getResponseEntity", e);
}
return null;
}
/**
* @param url
* @return
*/
public static String getRespAsString(String url) {
if (!ApplicationInfo.networkStatus) {
// No Internet Connection
return null;
}
try {
HttpEntity responseEntity = getResponseEntity(url);
if (responseEntity != null)
return EntityUtils.toString(responseEntity);
else
return null;
} catch (Exception e) {
Log.e(TAG, "getRespAsString", e);
}
return null;
}
Just get the response and invoke the parser, eg. SampleParser.parse(response);
来源：https://stackoverflow.com/questions/13453516/xml-parsing-encoding-utf-8-utf-8