Java中对XML的解析详解

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<InterfaceConfigItem> interfaceConfigList;       public List<FtpConfigItem> ftpConfigList;       public List<AdapterConfigItem> adapterConfigList;         public void startDocument() throws SAXException {           sysConfig = new SysConfigItem();           interfaceConfigList = new ArrayList<InterfaceConfigItem>();           ftpConfigList = new ArrayList<FtpConfigItem>();           adapterConfigList = new ArrayList<AdapterConfigItem>();       }         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;      }  }

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>  <InterBOSS>      <Version>0100</Version>      <TestFlag>0</TestFlag>      <BIPType>          <BIPCode>BIP2B518</BIPCode>          <ActivityCode>T2101518</ActivityCode>          <ActionCode>0</ActionCode>      </BIPType>      <RoutingInfo>          <OrigDomain>BOSS</OrigDomain>          <RouteType>routeType</RouteType>          <Routing>              <HomeDomain>XXXX</HomeDomain>              <RouteValue>routeValue</RouteValue>          </Routing>      </RoutingInfo>      <TransInfo>          <SessionID>2013041017222313925676</SessionID>          <TransIDO>2013041017222313925676</TransIDO>          <TransIDOTime>20130410172223</TransIDOTime>          <TransIDH></TransIDH>          <TransIDHTime></TransIDHTime>      </TransInfo>      <SNReserve>          <TransIDC></TransIDC>          <ConvID></ConvID>          <CutOffDay></CutOffDay>          <OSNTime></OSNTime>          <OSNDUNS></OSNDUNS>          <HSNDUNS></HSNDUNS>          <MsgSender></MsgSender>          <MsgReceiver></MsgReceiver>          <Priority></Priority>          <ServiceLevel></ServiceLevel>          <SvcContType></SvcContType>      </SNReserve>      <Response>          <RspType>rspType</RspType>          <RspCode>rspCode</RspCode>          <RspDesc>rspDesc</RspDesc>      </Response>      <SvcCont><![CDATA[<?xml version="1.0" encoding="UTF-8" standalone="yes"?>  <batchSyncOrderRelationReq>      <msgTransactionID>210001BIP2B518130410172223651627</msgTransactionID>      <reqNum>2</reqNum>      <reqBody>          <oprNumb>210001BIP2B518130410172224341871</oprNumb>          <subscriptionInfo>              <oprTime>oprTime1</oprTime>              <actionID>actionId1</actionID>              <brand>brand1</brand>              <effTime>effTime1</effTime>              <expireTime>expireTime1</expireTime>              <feeUser_ID>feeUserId1</feeUser_ID>              <destUser_ID>destUserId1</destUser_ID>              <actionReasonID>actionId1</actionReasonID>              <servType>servType1</servType>              <subServType>subServType1</subServType>              <SPID>spId1</SPID>              <SPServID>spServId1</SPServID>              <accessMode>accessMode1</accessMode>              <servParamInfo>                  <para_num>0</para_num>                  <para_info>                      <para_name></para_name>                      <para_value></para_value>                  </para_info>              </servParamInfo>              <feeType>feeType1</feeType>          </subscriptionInfo>      </reqBody>      <reqBody>          <oprNumb>210001BIP2B518130410172224420909</oprNumb>          <subscriptionInfo>              <oprTime>oprTime2</oprTime>              <actionID>actionId2</actionID>              <brand>brand2</brand>              <effTime>effTime2</effTime>              <expireTime>expireTime2</expireTime>              <feeUser_ID>feeUserId2</feeUser_ID>              <destUser_ID>destUserId2</destUser_ID>              <actionReasonID>actionId2</actionReasonID>              <servType>servType2</servType>              <subServType>subServType2</subServType>              <SPID>spId2</SPID>              <SPServID>spServId2</SPServID>              <accessMode>accessMode2</accessMode>              <servParamInfo>                  <para_num>0</para_num>                  <para_info>                      <para_name></para_name>                      <para_value></para_value>                  </para_info>              </servParamInfo>              <feeType>feeType2</feeType>          </subscriptionInfo>      </reqBody>  </batchSyncOrderRelationReq>]]></SvcCont>  </InterBOSS>

解码代码如下：

@XmlRootElement(name = "batchSyncOrderRelationReq")   @XmlAccessorType(XmlAccessType.FIELD)   public class BatchSyncOrderRelationReq extends BossMessage<BatchSyncOrderRelationReq> {         @XmlElement(name = "msgTransactionID")       private String msgTransactionId = "";         @XmlElement(name = "reqNum")       private String reqNum = "";         @XmlElement(name = "reqBody")       private List<BatchSyncOrderRelationReqBody> 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<BatchSyncOrderRelationReqBody> getReqBodyList() {           return this.reqBodyList;       }         public void setReqBodyList(List<BatchSyncOrderRelationReqBody> 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;      }  }

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