Класс описывающий произвольный елемент с хмл:
| Код |
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
public class Element {
private String name = null;
private HashMap<String,String> attributes = null;
private List<Element> subElements = null;
private String content = "";
private final int nesting;
public Element(String name,int nesting) {
this.name = name;
this.nesting = nesting;
}
public void setContent(String content){
if (content==null || getTextFromString(content).length()==0) return;
this.content = getTextFromString(content);
}
public void addContent(String content){
if (content==null || getTextFromString(content).length()==0) return;
if (this.content==null || this.content.equals(""))
this.content = getTextFromString(content);
else
this.content = this.content + getTextFromString(content);
}
public HashMap<String,String> getAttributes(){
if (attributes == null){
attributes = new HashMap<String, String>();
}
return attributes;
}
public List<Element> getElements(){
if (subElements == null){
subElements = new ArrayList<Element>();
}
return subElements;
}
public void addElement(Element element){
getElements().add(element);
}
public void addElements(List<Element> elements){
getElements().addAll(elements);
}
public void addAttribute(String atName,String atValue){
getAttributes().put(atName, atValue);
}
public void addAttributes(HashMap<String,String> attributes){
getAttributes().putAll(attributes);
}
public String getName(){
return name;
}
public String getContent(){
return content;
}
public String toString(){
return tabs()+"<"+getName()+" "+getAttributeList()+">"+
(getContent().length()>0 ? "\n\t"+tabs()+getContent():"")+
getElementsList()+
"\n"+tabs()+"</"+getName()+">";
}
private String getElementsList(){
StringBuilder sb = new StringBuilder();
for (Element elem: getElements()){
sb.append("\n"+elem);
}
return sb.toString();
}
private String getAttributeList(){
StringBuilder sb = new StringBuilder();
try{
Set<String> set = getAttributes().keySet();
Iterator<String> iter = set.iterator();
while (iter.hasNext()){
String tKey = iter.next();
if (sb.length()==0)
sb.append(tKey+"=\""+getAttributes().get(tKey)+"\"");
else
sb.append(" "+tKey+"=\""+getAttributes().get(tKey)+"\"");
}
}
catch(Exception e){
e.printStackTrace();
}
return sb.toString();
}
private String tabs(){
StringBuilder sb = new StringBuilder();
for (int i =0;i<nesting;i++){
sb.append("\t");
}
return sb.toString();
}
private String getTextFromString(String text){
StringBuilder sb = new StringBuilder(text);
if (sb.length()>0){
while (sb.length()>0 && (sb.charAt(0)=='\n' || sb.charAt(0)=='\r' || sb.charAt(0)=='\t')){
sb.deleteCharAt(0);
}
while (sb.length()>0 && (sb.charAt(sb.length()-1)=='\n' || sb.charAt(sb.length()-1)=='\r' || sb.charAt(sb.length()-1)=='\t')){
sb.deleteCharAt(sb.length()-1);
}
}
return sb.toString();
}
public List<Element> getElements(String name){
return getElements(name,0);
}
public List<Element> getElements(String name,int afterInd){
List<Element> list =getElements();
List<Element> newList =new ArrayList<Element>();
if (list.size()==0) return null;
if (afterInd<0 || afterInd>=list.size()) throw new IndexOutOfBoundsException("Index "+afterInd+" is out of bound("+(list.size()-1)+")");
for (int i = afterInd; i<list.size();i++){
if (list.get(i).getName().equals(name)) newList.add(list.get(i));
}
return newList;
}
public Element getElement(String name){
return getElement(name,0);
}
public Element getElement(String name,int afterInd){
List<Element> list = getElements();
if (list.size()==0) return null;
if (afterInd<0 || afterInd>=list.size()) throw new IndexOutOfBoundsException("Index "+afterInd+" is out of bound("+(list.size()-1)+")");
for (int i = afterInd; i<list.size();i++){
if (list.get(i).getName().equals(name)) return list.get(i);
}
return null;
}
}
|
Парсер:
| Код |
import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class SAXHandler extends DefaultHandler
{
private List<Element> elements=null;
private int nesting;
private String elementName = null;
public SAXHandler(String elementName) throws Exception {
if (elementName==null || elementName.length()<1) throw new Exception("Element name not specified!");
this.elementName = elementName;
nesting = -1;
}
public List<Element> getElements(){
if (elements==null){
elements = new ArrayList<Element>();
}
return elements;
}
@Override
public void startDocument() throws SAXException
{
elements = new ArrayList<Element>();
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException
{
if (nesting == -1){
if (elementName.equals(qName)){
Element tElem = new Element(qName,nesting+1);
addAttributesToElement(tElem, attributes);
getElements().add(tElem);
nesting++;
}
}
else {
try {
Element tElem = new Element(qName,nesting+1);
addAttributesToElement(tElem, attributes);
getElementFor(nesting).addElement(tElem);
nesting++;
} catch (Exception e) { }
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException
{
if (nesting==-1) return;
Element curr = null;
try {
curr = getElementFor(nesting);
} catch (Exception e) {
e.printStackTrace();
}
if(curr!=null){
curr.addContent(new String(ch, start, length));
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException
{
if (nesting!=-1)
--nesting;
}
private Element getLast(){
List<Element> list = getElements();
if (list.size()>0){
return list.get(list.size()-1);
}
return null;
}
private Element getElementFor(int nestingLevel) throws Exception{
if (nestingLevel<0 && nestingLevel>this.nesting) throw new Exception("Incorect nesting level "+nestingLevel+" of "+this.nesting);
Element curr = getLast();
while (nestingLevel>0){
curr = getLastSubElement(curr);
nestingLevel--;
}
return curr;
}
private Element getLastSubElement(Element parent){
if (parent!=null) {
List<Element> subElements = parent.getElements();
if (subElements.size()>0) return subElements.get(subElements.size()-1);
}
return null;
}
private void addAttributesToElement(Element elem, Attributes attributes){
int count = attributes.getLength();
for (int i=0;i<count;i++){
elem.addAttribute(attributes.getQName(i), attributes.getValue(i));
}
}
}
|
Пример парсинга:
| Код |
String s = <твой хмл>
InputStream in = new ByteArrayInputStream(s.getBytes("UTF-8"));
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser=null;
try {
parser = factory.newSAXParser();
} catch (Exception e) {
throw e;
}
SAXHandler handler;
try {
handler = new SAXHandler("FORECAST");
parser.parse(in, handler);
List<Element> agr = handler.getElements())
} catch (Exception e){}
|
| Цитата |
Я сделал класс FORECAST с полями типа String(куда хочу записать атрибуты) day,month,year,hour,tod, predict,weekday и поля пользовательских типов PHENOMENA, PRESSURE, TEMPERATURE, WIND,RELWET,HEAT( которые в свою очередь содержат в полях типа String атрибуты соответствующих тэгов из xml).
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Можешь реализовать свои классы описывающие елементы таким образом, чтоб в конструктор передавалась ссылка на Element, и в конструкторе инициализировать необходимые поля.
Например:
| Код |
public class Forecast{
private String day;
private String month;
private String year;
...................................
private Phenomena phenomena = null;
public Forecast(Element element) throws Exception{
day=element.getAttributes().get("day");
if (day== null) throw new Exception("can't parse day");
month=element.getAttributes().get("month");
if (month == null) throw new Exception("can't parse month");
....................................
phenomena = new Phenomena (element.getElement("PHENOMENA"));
...................................
}
public String getDay() {
return day;
}
public String getMonth() {
return month;
}
........................
public Phenomena getPhenomena(){
return phenomena;
}
}
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