JAVA语言利用DOM解析XML文件

利用DOM解析XML文件的时候，会把XML文件预读的内存中，如果是比较大的XML文件或者是移动设备的话，不建议使用此方法

下面是我解析一个XML文件的详细代码

import java.io.InputStream;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import com.fujitsu.cn.model.Patent;import com.fujitsu.cn.util.LogHelper;/** * 采用DOM解析xml文件 */public class DOMDetailService {public static Patent getPatent(InputStream inStream) throws Exception {Patent patent = new Patent();LogHelper.v("domservice");DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();DocumentBuilder db = dbf.newDocumentBuilder();Document document = db.parse(inStream);//通过getDocumentElement()方法获得该xml文件的根节点Element root = document.getDocumentElement();//获得以 details为标签对的所有节点对的列表<details></details>NodeList detailNodes = root.getElementsByTagName("details");//由于本xml文件中只有一个这样的标签对，通过item(i)得到该元素，并且进行强制转化Element patentElement = (Element) detailNodes.item(0);//获得该标签下面的所有标签的节点列表NodeList childList = patentElement.getChildNodes();//对获得到的节点列表进行遍历   getLength()可以得到NodeList列表的长度for(int i=0; i<childList.getLength();i++){//遍历所有的属性节点   nodelist.item(i)返回一个Node节点Node patentAttribut = (Node)childList.item(i);//由于可能会出现空的节点，对该节点进行判断，判断该节点是不是该xml中的元素//Node.ELEMENT_NODE的值为1，表示该节点是一个Elementif(patentAttribut.getNodeType() == Node.ELEMENT_NODE){//通过getNodeName()得到该Node的名字//例如遍历到<type>3</type>，取值以后就是 typeString tag = patentAttribut.getNodeName();//getFirstChild()表示获得该节点下面的第一个孩子，getNodeValue()表示得到该孩子的值//例如遍历到<type>3</type>通过该函数得到的值为3String val = patentAttribut.getFirstChild().getNodeValue();if("othercontents".equals(tag)){patent.setOthercontents(val);}else if("publiccountry".equals(tag)){patent.setCountry(val);}elseif("type".equals(tag)){patent.setType(val);}elseif("title".equals(tag)){patent.setTitle(val);}elseif("IPC".equals(tag)){patent.setIpc_number(val);}elseif("status".equals(tag)){patent.setStatus(val);}elseif("pagenum".equals(tag)){patent.setPagenum(val);}elseif("submitid".equals(tag)){patent.setSubmit_number(val);}elseif("inventors".equals(tag)){patent.setInventor(val);}elseif("agent".equals(tag)){patent.setAgent(val);}elseif("claims".equals(tag)){patent.setClaims(val);}elseif("applicant".equals(tag)){patent.setProposer(val);}}}inStream.close();return patent;}}

对该单元进行测试的测试类如下所示：

import java.io.InputStream;import java.util.List;public class Test {public static void main(String[] args) throws Exception {InputStream inStream = new MainTest().getClass().getClassLoader().getResourceAsStream("detail.xml");Patent p = DOMDetailService.getPatent(inStream);System.out.println(p.getOthercontents());}}

解析的XML文件由于内容太多，已经将其中的内容精简

<?xml version="1.0" encoding="utf-8"?> <response>   <details>     <othercontents>1</othercontents>     <publiccountry>2</publiccountry>     <type>3</type>     <title>4</title>     <IPC>5</IPC>     <status>6</status>     <pagenum>7</pagenum>     <submitid>8</submitid>     <submitdate>9</submitdate>     <inventors>10</inventors>     <agent>11</agent>     <claims>12</claims>     <applicant>13</applicant>   </details> </response>

用到的Model如下所示

public class Patent {private String title;private String country;private String type;private String status;private String ipc_number;private String patent_pages;private String submit_number;private String submit_data;private String proposer;private String inventor;private String agent;private String othercontents;private String pagenum;private String articleid;private String claims;public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getCountry() {return country;}public void setCountry(String country) {this.country = country;}public String getType() {return type;}public void setType(String type) {this.type = type;}public String getStatus() {return status;}public void setStatus(String status) {this.status = status;}public String getPatent_pages() {return patent_pages;}public void setPatent_pages(String patentPages) {patent_pages = patentPages;}public String getSubmit_number() {return submit_number;}public void setSubmit_number(String submitNumber) {submit_number = submitNumber;}public String getSubmit_data() {return submit_data;}public void setSubmit_data(String submitData) {submit_data = submitData;}public String getProposer() {return proposer;}public void setProposer(String proposer) {this.proposer = proposer;}public String getInventor() {return inventor;}public void setInventor(String inventor) {this.inventor = inventor;}public String getAgent() {return agent;}public void setAgent(String agent) {this.agent = agent;}public String getIpc_number() {return ipc_number;}public void setIpc_number(String ipcNumber) {ipc_number = ipcNumber;}public String getOthercontents() {return othercontents;}public void setOthercontents(String othercontents) {this.othercontents = othercontents;}public String getPagenum() {return pagenum;}public void setPagenum(String pagenum) {this.pagenum = pagenum;}public String getArticleid() {return articleid;}public void setArticleid(String articleid) {this.articleid = articleid;}public String getClaims() {return claims;}public void setClaims(String claims) {this.claims = claims;}}