DOM方式解析xml文件
import java.io.FileInputStream;import java.io.FileNotFoundException;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import com.safetys.customerform.xml.model.Area;/** * * @author hehc * */public class AreaUtil {public static final String FROM_XML = "xml";private String from = FROM_XML;private String xmlFileDirectory;private Map<String,Area> areaMap = new HashMap<String, Area>(); // provinceCode, provinceAreaprivate AreaUtil(){super();}public final static AreaUtil getInstance(String FROM, String xmlFileDirectory){AreaUtil areaUtil = new AreaUtil();areaUtil.setFrom(FROM);areaUtil.setXmlFileDirectory(xmlFileDirectory);areaUtil.init();return areaUtil;}/** * 解析xml文件 ******************************************************** * template of xml: * * <area name="国家"> * * <first-area name="省" code=""> * * <second-area name="市" code=""> * * <third-area name="区" code=""></third-area> * * </second-area> * * </first-area> * * </area> * ******************************************************** */private void init(){if(from != null && from.equals(AreaUtil.FROM_XML)){DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();try {DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();if(xmlFileDirectory == null)throw new Exception("xml文件地址为空！");Document doc = documentBuilder.parse(new FileInputStream(xmlFileDirectory));Element areaRoot = doc.getDocumentElement();// System.out.println(areaRoot.getAttribute("name"));NodeList firstAreas = areaRoot.getChildNodes();Map<String,Area> firstAreaMap = new HashMap<String, Area>();for(int i = 0; i < firstAreas.getLength(); i++){//遍历first-area标签Area firstArea = new Area();Node firstNode = firstAreas.item(i);if(firstNode.getNodeType() == Node.ELEMENT_NODE){firstArea.setName(firstNode.getAttributes().getNamedItem("name").getNodeValue());firstArea.setCode(firstNode.getAttributes().getNamedItem("code").getNodeValue());NodeList secondAreas = firstNode.getChildNodes();Map<String,Area> secondAreaMap = new HashMap<String, Area>();for(int j = 0; j < secondAreas.getLength(); j++){//遍历second-area标签Area secondArea = new Area();Node secondNode = secondAreas.item(j);if(secondNode.getNodeType() == Node.ELEMENT_NODE){secondArea.setName(secondNode.getAttributes().getNamedItem("name").getNodeValue());secondArea.setCode(secondNode.getAttributes().getNamedItem("code").getNodeValue());NodeList thirdAreas = secondNode.getChildNodes();Map<String,Area> thirdAreaMap = new HashMap<String, Area>();for(int k = 0; k < thirdAreas.getLength(); k++){//遍历third-area标签Area thirdArea = new Area();Node thirdNode = thirdAreas.item(k);if(thirdNode.getNodeType() == Node.ELEMENT_NODE){thirdArea.setName(thirdNode.getAttributes().getNamedItem("name").getNodeValue());thirdArea.setCode(thirdNode.getAttributes().getNamedItem("code").getNodeValue());thirdAreaMap.put(thirdArea.getCode(), thirdArea);}}secondArea.setAreaMap(thirdAreaMap);secondAreaMap.put(secondArea.getCode(), secondArea);}}firstArea.setAreaMap(secondAreaMap);firstAreaMap.put(firstArea.getCode(), firstArea);}}areaMap = firstAreaMap;} catch (ParserConfigurationException e) {e.printStackTrace();} catch (FileNotFoundException e) { e.printStackTrace();} catch (Exception e) {e.printStackTrace();} }}/** * 返回当前国家区域的所有下一级(二级)行政单位（中国：省） * @return Map<String provinceCode, String provinceName> */public Map<String, String> getProvinces(){Map<String, String> map = new HashMap<String, String>();if(areaMap != null && !areaMap.isEmpty()){Iterator<String> it = areaMap.keySet().iterator();while(it.hasNext()){String code = it.next();map.put(code, areaMap.get(code).getName());}}return map;}/** * 返回当前国家区域、指定二级行政单位下的所有三级行政单位（中国：市） * @param provinceCode * @return Map<String cityCode, String cityName> */public Map<String, String> getCities(String provinceCode){Map<String, String> map = new HashMap<String, String>();if(areaMap != null & !areaMap.isEmpty()){Area firstArea = areaMap.get(provinceCode);if(firstArea != null){Map<String, Area> secondAreaMap = firstArea.getAreaMap();if(secondAreaMap != null && !secondAreaMap.isEmpty()){Iterator<String> it = secondAreaMap.keySet().iterator();while(it.hasNext()){String code = it.next();map.put(code, secondAreaMap.get(code).getName());}}}}return map;}/** * 返回当前国家区域、指定二级行政单位下的所有四级行政单位（中国：区） * @param provinceCode * @param cityCode * @return Map<String regionCode, String regionName> */public Map<String, String> getRegions(String provinceCode, String cityCode){Map<String, String> map = new HashMap<String, String>();if(areaMap != null & !areaMap.isEmpty()){Area firstArea = areaMap.get(provinceCode);if(firstArea != null){Map<String,Area> secondAreaMap = firstArea.getAreaMap();if(secondAreaMap != null && !secondAreaMap.isEmpty()){Area secondArea = secondAreaMap.get(cityCode);if(secondArea != null){Map<String, Area> thirdAreaMap = secondArea.getAreaMap();if(thirdAreaMap != null && !thirdAreaMap.isEmpty()){Iterator<String> it = thirdAreaMap.keySet().iterator();while(it.hasNext()){String code = it.next();map.put(code, thirdAreaMap.get(code).getName());}}}}}}return map;}/** * 根据当前国家区域、指定某区域代码获取该区域名称 * @param areaCode * @return String */public String getAreaName(String areaCode) throws Exception{if(areaMap != null && !areaMap.isEmpty()){Iterator<String> it = areaMap.keySet().iterator();while(it.hasNext()){String firstCode = it.next();if(firstCode.equals(areaCode)){return areaMap.get(firstCode).getName();}Map<String, Area> secondAreaMap = areaMap.get(firstCode).getAreaMap();if(secondAreaMap != null && !secondAreaMap.isEmpty()){Iterator<String> it_ = secondAreaMap.keySet().iterator();while(it_.hasNext()){String secondCode = it_.next();if(secondCode.equals(areaCode)){return secondAreaMap.get(secondCode).getName();}Map<String, Area> thirdAreaMap = secondAreaMap.get(secondCode).getAreaMap();if(thirdAreaMap != null && !thirdAreaMap.isEmpty()){Iterator<String> it__ = thirdAreaMap.keySet().iterator();while(it__.hasNext()){String thirdCode = it__.next();if(thirdCode.equals(areaCode)){return thirdAreaMap.get(thirdCode).getName();}}}}}}throw new Exception("未知区域");}return null;}private void setFrom(String from) {this.from = from;}private void setXmlFileDirectory(String xmlFileDirectory) {this.xmlFileDirectory = xmlFileDirectory;}