Explication détaillée de l'analyse XML en Java

Parlons brièvement des trois premières méthodes :

Méthode DOM : Personnellement, je comprends qu'elle est similaire au XmlDocument de .net, qui n'est pas efficace lors de l'analyse, prend de la mémoire et ne convient pas pour analyse de XML volumineux ;

Méthode SAX : analyse basée sur les événements Lorsqu'une certaine partie du XML est analysée, un événement spécifique sera déclenché. Vous pouvez définir quoi faire lorsque l'événement est déclenché dans une classe d'analyse personnalisée. ; Personnellement, je pense que c'est une méthode très différente, je me demande s'il existe une méthode similaire sous le système .Net ?

Méthode StAX : je comprends personnellement la méthode XmlReader similaire à .net, qui est très efficace, prend moins de mémoire et convient à l'analyse de gros XML

Cependant, la méthode SAX a été utilisé auparavant. Cet article présente principalement JAXB. Seul le code principal est publié ici :

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(&#39;.&#39;) + 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;
    }
}

Ce qui suit se concentre sur le plus pratique : JAXB (Java Architecture for XML Binding)
Ici, nous utilisons l'interface XML mobile BatchSyncOrderRelationReq plus complexe comme exemple (je pense que tous ceux qui peuvent comprendre cela sont fondamentalement suffisants), le format du message est le suivant (le contenu CDATA dans SvcCont est le corps du message, donc dégoûtant) :

<?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>

Le code de décodage est le suivant :

@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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