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小编给大家分享一下Java中如何解析XML，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
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先简单说下前三种方式：
DOM方式：个人理解类似.net的XmlDocument，解析的时候效率不高，占用内存，不适合大XML的解析；
SAX方式：基于事件的解析，当解析到xml的某个部分的时候，会触发特定事件，可以在自定义的解析类中定义当事件触发时要做得事情；个人感觉一种很另类的方式，不知道.Net体系下是否有没有类似的方式？
StAX方式：个人理解类似.net的XmlReader方式，效率高，占用内存少，适用大XML的解析；
不过SAX方式之前也用过，本文主要介绍JAXB，这里只贴下主要代码：
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 ConfigParser extends DefaultHandler {
private String currentConfigSection;
public SysConfigItem sysConfig;
public List interfaceConfigList;
public List ftpConfigList;
public List adapterConfigList;
public void startDocument() throws SAXException {
sysConfig = new SysConfigItem();
interfaceConfigList = new ArrayList();
ftpConfigList = new ArrayList();
adapterConfigList = new ArrayList();
}
public void endDocument() throws SAXException {
}
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
if (qName.equalsIgnoreCase("Item") && attributes.getLength() > 0) {
if (currentConfigSection.equalsIgnoreCase("SysConfigItem")) {
sysConfig = new SysConfigItem(attributes);
} else if (currentConfigSection.equalsIgnoreCase("InterfaceConfigItems")) {
interfaceConfigList.add(new InterfaceConfigItem(attributes));
} else if (currentConfigSection.equalsIgnoreCase("FtpConfigItems")) {
ftpConfigList.add(new FtpConfigItem(attributes));
} else if (currentConfigSection.equalsIgnoreCase("AdapterConfigItems")) {
adapterConfigList.add(new AdapterConfigItem(attributes));
}
} else {
currentConfigSection = qName;
}
}
public void endElement(String uri, String localName, String qName) throws SAXException {
}
public void characters(char ch[], int start, int length) throws SAXException {
}
} import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.xml.sax.Attributes;
public class ConfigItemBase {
private static DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
public ConfigItemBase() {
}
/**
* 目前只支持几种常用类型 如果需要支持其他类型，请修改这里的代码
*
* @param attributes
*/
public ConfigItemBase(Attributes attributes) {
Class cls = this.getClass();
Field[] fields = cls.getDeclaredFields();
for (Field field : fields) {
String fieldType = field.getType().getSimpleName();
for (int i = 0; i < attributes.getLength(); i++) {
if (attributes.getQName(i).equalsIgnoreCase(field.getName())) {
field.setAccessible(true);
try {
if (fieldType.equalsIgnoreCase("String")) {
field.set(this, attributes.getValue(attributes.getQName(i)));
} else if (fieldType.equalsIgnoreCase("Integer")) {
field.set(this, Integer.valueOf(attributes.getValue(attributes.getQName(i))));
} else if (fieldType.equalsIgnoreCase("Double")) {
field.set(this, Double.valueOf(attributes.getValue(attributes.getQName(i))));
} else if (fieldType.equalsIgnoreCase("Date")) {
field.set(this, GetDate(attributes.getValue(attributes.getQName(i))));
} else {
System.out.println("Warning:Unhandler Field(" + field.getName() + "-" + fieldType + ")");
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
break;
}
}
}
}
public String toString() {
String result = "";
Class cls = this.getClass();
String classNameString = cls.getName();
result += classNameString.substring(classNameString.lastIndexOf('.') + 1, classNameString.length()) + ":";
Field[] fields = cls.getDeclaredFields();
for (Field field : fields) {
try {
result += field.getName() + "=" + field.get(this) + ";";
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
return result;
}
/**
* 处理时间类型属性（时间格式要求为：yyyy-MM-dd hh:mm:ss）
*
* @param dateString
* @return
*/
private static Date GetDate(String dateString) {
Date date = null;
try {
date = dateFormat.parse(dateString);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
}下面重点介绍一下最方便的:JAXB(Java Architecture for XML Binding)
这里用比较复杂的移动BatchSyncOrderRelationReq接口XML做为示例（感觉能解这个大家基本上够用了），报文格式如下（SvcCont里的CDATA内容是报文体，太恶心了）：
0100 0 BIP2B518 T2101518 0 BOSS routeType XXXX routeValue 2013041017222313925676 2013041017222313925676 20130410172223 rspType rspCode rspDesc ]]> 210001BIP2B518130410172223651627 2 210001BIP2B518130410172224341871 oprTime1 actionId1 brand1 effTime1 expireTime1 feeUserId1 destUserId1 actionId1 servType1 subServType1 spId1 spServId1 accessMode1 0 feeType1 210001BIP2B518130410172224420909 oprTime2 actionId2 brand2 effTime2 expireTime2 feeUserId2 destUserId2 actionId2 servType2 subServType2 spId2 spServId2 accessMode2 0 feeType2
解码代码如下：
@XmlRootElement(name = "batchSyncOrderRelationReq") @XmlAccessorType(XmlAccessType.FIELD) public class BatchSyncOrderRelationReq extends BossMessage{ @XmlElement(name = "msgTransactionID") private String msgTransactionId = ""; @XmlElement(name = "reqNum") private String reqNum = ""; @XmlElement(name = "reqBody") private List reqBodyList; public BatchSyncOrderRelationReq() { } public String getMsgTransactionId() { return this.msgTransactionId; } public void setMsgTransactionId(String msgTransactionId) { this.msgTransactionId = msgTransactionId; } public String getReqNum() { return this.reqNum; } public void setReqNum(String reqNum) { this.reqNum = reqNum; } public List getReqBodyList() { return this.reqBodyList; } public void setReqBodyList(List reqBodyList) { this.reqBodyList = reqBodyList; } @Override public BatchSyncOrderRelationReq Deserialized(String interBossXmlContent) throws BusinessException { try { // deserialized for head JAXBContext jaxbCxt4Head = JAXBContext.newInstance(MessageHead.class); Unmarshaller unmarshaller4Head = jaxbCxt4Head.createUnmarshaller(); MessageHead head = (MessageHead) unmarshaller4Head.unmarshal(new StringReader(interBossXmlContent)); // deserialized for SyncOrderRelationReq body JAXBContext jaxbCxt4Body = JAXBContext.newInstance(BatchSyncOrderRelationReq.class); Unmarshaller unmarshaller4Body = jaxbCxt4Body.createUnmarshaller(); BatchSyncOrderRelationReq batchSyncOrderRelationReq = (BatchSyncOrderRelationReq) unmarshaller4Body.unmarshal(new StringReader(head.getSvcCont().trim())); batchSyncOrderRelationReq.setHead(head); return batchSyncOrderRelationReq; } catch (JAXBException e) { throw new BusinessException("SyncOrderRelationReq.Deserialized() Error!(" + interBossXmlContent + ")", e); } } }
@XmlAccessorType(XmlAccessType.FIELD)
public class BatchSyncOrderRelationReqBody {
@XmlElement(name = "oprNumb")
private String oprNumb = "";
@XmlElement(name = "subscriptionInfo")
private SubscriptionInfo subscriptionInfo;
public BatchSyncOrderRelationReqBody(){
}
public BatchSyncOrderRelationReqBody(String oprNumb, SubscriptionInfo subscriptionInfo) {
this.oprNumb = oprNumb;
this.subscriptionInfo = subscriptionInfo;
}
public String getOprNumb() {
return this.oprNumb;
}
public void setOprNumb(String oprNumb) {
this.oprNumb = oprNumb;
}
public SubscriptionInfo getSubscriptionInfo() {
return this.subscriptionInfo;
}
public void setSubscriptionInfo(SubscriptionInfo subscriptionInfo) {
this.subscriptionInfo = subscriptionInfo;
}
}@XmlAccessorType(XmlAccessType.FIELD)
public class SubscriptionInfo {
@XmlElement(name = "oprTime")
private String oprTime = "";
@XmlElement(name = "actionID")
private String actionId = "";
@XmlElement(name = "brand")
private String brand = "";
@XmlElement(name = "effTime")
private String effTime = "";
@XmlElement(name = "expireTime")
private String expireTime = "";
@XmlElement(name = "feeUser_ID")
private String feeUserId = "";
@XmlElement(name = "destUser_ID")
private String destUserId = "";
@XmlElement(name = "actionReasonID")
private String actionReasonId = "";
@XmlElement(name = "servType")
private String servType = "";
@XmlElement(name = "subServType")
private String subServType = "";
@XmlElement(name = "SPID")
private String spId = "";
@XmlElement(name = "SPServID")
private String spServId = "";
@XmlElement(name = "accessMode")
private String accessMode = "";
@XmlElement(name = "feeType")
private String feeType = "";
public SubscriptionInfo() {
}
public SubscriptionInfo(
String oprTime,
String actionId,
String brand,
String effTime,
String expireTime,
String feeUserId,
String destUserId,
String actionReasonId,
String servType,
String subServType,
String spId,
String spServId,
String accessMode,
String feeType) {
this.oprTime = oprTime;
this.actionId = actionId;
this.brand = brand;
this.effTime = effTime;
this.expireTime = expireTime;
this.feeUserId = feeUserId;
this.destUserId = destUserId;
this.actionReasonId = actionReasonId;
this.servType = servType;
this.subServType = subServType;
this.spId = spId;
this.spServId = spServId;
this.accessMode = accessMode;
this.feeType = feeType;
}
public String getOprTime() {
return this.oprTime;
}
public void setOprTime(String oprTime) {
this.oprTime = oprTime;
}
public String getActionId() {
return this.actionId;
}
public void setActionId(String actionId) {
this.actionId = actionId;
}
public String getBrand() {
return this.brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public String getEffTime() {
return this.effTime;
}
public void setEffTime(String effTime) {
this.effTime = effTime;
}
public String getExpireTime() {
return this.expireTime;
}
public void setExpireTime(String expireTime) {
this.expireTime = expireTime;
}
public String getFeeUserId() {
return this.feeUserId;
}
public void setFeeUserId(String feeUserId) {
this.feeUserId = feeUserId;
}
public String getDestUserId() {
return this.destUserId;
}
public void setDestUserId(String destUserId) {
this.destUserId = destUserId;
}
public String getActionReasonId() {
return this.actionReasonId;
}
public void setActionReasonId(String actionReasonId) {
this.actionReasonId = actionReasonId;
}
public String getServType() {
return this.servType;
}
public void setServType(String servType) {
this.servType = servType;
}
public String getSubServType() {
return this.subServType;
}
public void setSubServType(String subServType) {
this.subServType = subServType;
}
public String getSpId() {
return this.spId;
}
public void setSpId(String spId) {
this.spId = spId;
}
public String getSpServId() {
return this.spServId;
}
public void setSpServId(String spServId) {
this.spServId = spServId;
}
public String getAccessMode() {
return this.accessMode;
}
public void setAccessMode(String accessMode) {
this.accessMode = accessMode;
}
public String getFeeType() {
return this.feeType;
}
public void setFeeType(String feeType) {
this.feeType = feeType;
}
}以上是“Java中如何解析XML”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！
