Java下3中XML解析：DOM方式、SAX方式和StAX方式

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目前我知道的JAVA解析XML的方式有：DOM, SAX, StAX；如果选用这几种，感觉还是有点麻烦；如果使用：JAXB(Java Architecture for XML Binding)，个人觉得太方便了！

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：

1 import java.util.ArrayList;

 2 import java.util.List;
 3 
 4 import org.xml.sax.Attributes;
 5 import org.xml.sax.SAXException;
 6 import org.xml.sax.helpers.DefaultHandler;
 7 
 8 public class ConfigParser extends DefaultHandler {
 9     private String currentConfigSection;
10 
11     public SysConfigItem sysConfig;
12     public List<InterfaceConfigItem> interfaceConfigList;
13     public List<FtpConfigItem> ftpConfigList;
14     public List<AdapterConfigItem> adapterConfigList;
15 
16     public void startDocument() throws SAXException {
17         sysConfig = new SysConfigItem();
18         interfaceConfigList = new ArrayList<InterfaceConfigItem>();
19         ftpConfigList = new ArrayList<FtpConfigItem>();
20         adapterConfigList = new ArrayList<AdapterConfigItem>();
21     }
22 
23     public void endDocument() throws SAXException {
24 
25     }
26 
27     public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
28         if (qName.equalsIgnoreCase("Item") && attributes.getLength() > 0) {
29             if (currentConfigSection.equalsIgnoreCase("SysConfigItem")) {
30                 sysConfig = new SysConfigItem(attributes);
31             } else if (currentConfigSection.equalsIgnoreCase("InterfaceConfigItems")) {
32                 interfaceConfigList.add(new InterfaceConfigItem(attributes));
33             } else if (currentConfigSection.equalsIgnoreCase("FtpConfigItems")) {
34                 ftpConfigList.add(new FtpConfigItem(attributes));
35             } else if (currentConfigSection.equalsIgnoreCase("AdapterConfigItems")) {
36                 adapterConfigList.add(new AdapterConfigItem(attributes));
37             }
38         } else {
39             currentConfigSection = qName;
40         }
41     }
42 
43     public void endElement(String uri, String localName, String qName) throws SAXException {
44 
45     }
46 
47     public void characters(char ch[], int start, int length) throws SAXException {
48 
49     }
50 }

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）：

<?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：

1 @XmlRootElement(name = "batchSyncOrderRelationReq")

  2 @XmlAccessorType(XmlAccessType.FIELD)
  3 public class BatchSyncOrderRelationReq extends BossMessage<BatchSyncOrderRelationReq> {
  4 
  5     @XmlElement(name = "msgTransactionID")
  6     private String msgTransactionId = "";
  7 
  8     @XmlElement(name = "reqNum")
  9     private String reqNum = "";
 10 
 11     @XmlElement(name = "reqBody")
 12     private List<BatchSyncOrderRelationReqBody> reqBodyList;
 13 
 14     public BatchSyncOrderRelationReq() {
 15 
 16     }
 17 
 18     public String getMsgTransactionId() {
 19         return this.msgTransactionId;
 20     }
 21 
 22     public void setMsgTransactionId(String msgTransactionId) {
 23         this.msgTransactionId = msgTransactionId;
 24     }
 25 
 26     public String getReqNum() {
 27         return this.reqNum;
 28     }
 29 
 30     public void setReqNum(String reqNum) {
 31         this.reqNum = reqNum;
 32     }
 33 
 34     public List<BatchSyncOrderRelationReqBody> getReqBodyList() {
 35         return this.reqBodyList;
 36     }
 37 
 38     public void setReqBodyList(List<BatchSyncOrderRelationReqBody> reqBodyList) {
 39         this.reqBodyList = reqBodyList;
 40     }
 41  
131     @Override
132     public BatchSyncOrderRelationReq Deserialized(String interBossXmlContent) throws BusinessException {
133         try {
134             // deserialized for head
135             JAXBContext jaxbCxt4Head = JAXBContext.newInstance(MessageHead.class);
136             Unmarshaller unmarshaller4Head = jaxbCxt4Head.createUnmarshaller();
137             MessageHead head = (MessageHead) unmarshaller4Head.unmarshal(new StringReader(interBossXmlContent));
138 
139             // deserialized for SyncOrderRelationReq body
140             JAXBContext jaxbCxt4Body = JAXBContext.newInstance(BatchSyncOrderRelationReq.class);
141             Unmarshaller unmarshaller4Body = jaxbCxt4Body.createUnmarshaller();
142             BatchSyncOrderRelationReq batchSyncOrderRelationReq = (BatchSyncOrderRelationReq) unmarshaller4Body.unmarshal(new StringReader(head.getSvcCont().trim()));
143             batchSyncOrderRelationReq.setHead(head);
144 
145             return batchSyncOrderRelationReq;
146         } catch (JAXBException e) {
147             throw new BusinessException("SyncOrderRelationReq.Deserialized() Error!(" + interBossXmlContent + ")", e);
148         }
149     }
150 
151 }

@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;
    }
}