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Element
if(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 type
String 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3
String val = patentAttribut.getFirstChild().getNodeValue();
if("othercontents".equals(tag)){
patent.setOthercontents(val);
}else
if("publiccountry".equals(tag)){
patent.setCountry(val);
}else
if("type".equals(tag)){
patent.setType(val);
}
else
if("title".equals(tag)){
patent.setTitle(val);
}
else
if("IPC".equals(tag)){
patent.setIpc_number(val);
}
else
if("status".equals(tag)){
patent.setStatus(val);
}
else
if("pagenum".equals(tag)){
patent.setPagenum(val);
}
else
if("submitid".equals(tag)){
patent.setSubmit_number(val);
}
else
if("inventors".equals(tag)){
patent.setInventor(val);
}
else
if("agent".equals(tag)){
patent.setAgent(val);
}
else
if("claims".equals(tag)){
patent.setClaims(val);
}
else
if("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;
}

}