JAXB返回null

我已經閱讀了幾個JAXB教程，並試圖實現我自己的。我退回原狀。我不確定爲什麼我變得空。這是我的XML文檔。我很抱歉，這篇文章主要是代碼。我只是不確定我是否正確實現了JAXB。JAXB返回null

<EZMAXMOBILE_OFFLINE_PROPERTIES synctime=""> 

<ENTITY_DEFS> 
    <ENTITY name="WORKORDER"> 
     <INDEXES>   
      <INDEX name="IDX_WO_1">WORKORDERID</INDEX> 
      <INDEX name="IDX_WO_2">WONUM, SITEID</INDEX> 
      <INDEX name="IDX_WO_3">ASSETNUM, SITEID</INDEX> 
      <INDEX name="IDX_WO_4">LOCATION, SITEID</INDEX> 
     </INDEXES>  
     <COLUMNS> 
      <COLUMN autokey="Y" autokeyprefix="LOCAL" parentkeycol="PARENTID" uniquekey="Y">WORKORDERID</COLUMN> 
      <COLUMN displaykey="Y" autokey="Y" autokeyprefix="OFFLN">WONUM</COLUMN> 
      <COLUMN>PARENTID</COLUMN> 
      <COLUMN>PARENT</COLUMN> 
      <COLUMN>DESCRIPTION</COLUMN> 
      <COLUMN>LONGDESCRIPTION</COLUMN> 
      <COLUMN>LOCATION</COLUMN> 
      <COLUMN>ASSETNUM</COLUMN> 
      <COLUMN>PERSONGROUP</COLUMN> 
      <COLUMN>CREWID</COLUMN> 
      <COLUMN>SUPERVISOR</COLUMN> 
      <COLUMN>LEAD</COLUMN> 
      <COLUMN>PHONE</COLUMN> 
      <COLUMN>REPORTEDBY</COLUMN> 
      <COLUMN>REPORTDATE</COLUMN> 
      <COLUMN>STATUS</COLUMN> 
      <COLUMN>STATUSDATE</COLUMN> 
      <COLUMN>WOPRIORITY</COLUMN> 
      <COLUMN>WORKTYPE</COLUMN> 
      <COLUMN>FAILURECODE</COLUMN> 
      <COLUMN>PROBLEMCODE</COLUMN> 
      <COLUMN>ISTASK</COLUMN> 
      <COLUMN>ORIGRECORDID</COLUMN> 
      <COLUMN>ESTDUR</COLUMN> 
      <COLUMN>OBSERVATION</COLUMN> 
      <COLUMN>MEASUREMENTVALUE</COLUMN> 
      <COLUMN>TASKID</COLUMN> 
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>ORGID</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION> 
      <ACTION>offline/getMyWorkOrderListJson.action</ACTION> 
      <ACTION>offline/getMyTaskWorkOrderListJson.action</ACTION> 
     </INIT_ACTION> 
     <DELTA_ACTION> 
      <ACTION>offline/getDeltaMyWorkOrderListJson.action</ACTION> 
      <ACTION>offline/getDeltaMyTaskWorkOrderListJson.action</ACTION> 
     </DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="WORKORDER" transentitykey="WORKORDERID"> 
      <ACTION name="INSERT" beanname="OfflineDataSyncAction" methodname="addWorkOrder"/> 
      <ACTION name="EDIT" beanname="OfflineDataSyncAction" methodname="editWorkOrder"/> 
      <ACTION name="INSERT_TASK" beanname="OfflineDataSyncAction" methodname="addTaskWorkOrder"/> 
      <ACTION name="UPDATE_STATUS" beanname="OfflineDataSyncAction" methodname="updateWorkOrderStatus"/> 
      <ACTION name="UPDATE_TASK" beanname="OfflineDataSyncAction" methodname="updateWorkOrderTask"/> 
      <ACTION name="UPDATE_TASK_STATUS" beanname="OfflineDataSyncAction" methodname="updateWorkOrderStatus"/> 
      <ACTION name="EMM_FILE_UPLOAD"/> 
     </SYNC_ACTIONS> 
    </ENTITY> 
    <ENTITY name="LABTRANS"> 
     <INDEXES>   
      <INDEX name="IDX_LT_1">WONUM, SITEID, LABORCODE</INDEX> 
      <INDEX name="IDX_LT_2">WONUM, SITEID, LABORCODE, TIMERSTATUS</INDEX> 
     </INDEXES> 
     <COLUMNS> 
      <COLUMN displaykey="Y" uniquekey="Y" autokey="Y" autokeyprefix="LT">LABTRANSID</COLUMN> 
      <COLUMN>WORKORDERID</COLUMN> 
      <COLUMN>WONUM</COLUMN> 
      <COLUMN>LABORCODE</COLUMN> 
      <COLUMN>CRAFT</COLUMN> 
      <COLUMN>REGULARHRS</COLUMN> 
      <COLUMN>PREMIUMPAYCODE</COLUMN> 
      <COLUMN>PREMIUMPAYHOURS</COLUMN> 
      <COLUMN>STARTDATE</COLUMN> 
      <COLUMN>FINISHDATE</COLUMN>    
      <COLUMN>TRANSTYPE</COLUMN> 
      <COLUMN>TIMERSTATUS</COLUMN>     
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>ORGID</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION> 
      <ACTION>offline/getMyLabTransJson.action</ACTION> 
      <ACTION>offline/getMyTaskLabTransJson.action</ACTION> 
     </INIT_ACTION> 
     <DELTA_ACTION> 
      <ACTION>offline/getDeltaMyLabTransJson.action</ACTION> 
      <ACTION>offline/getDeltaMyTaskLabTransJson.action</ACTION> 
     </DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="WORKORDER" transentitykey="WORKORDERID"> 
      <ACTION name="INSERT" beanname="OfflineDataSyncAction" methodname="addLabTrans"/> 
      <ACTION name="START_TIMER" beanname="OfflineDataSyncAction" methodname="startTimer"/> 
      <ACTION name="STOP_TIMER" beanname="OfflineDataSyncAction" methodname="stopTimer"/> 
     </SYNC_ACTIONS> 
    </ENTITY>   
    <ENTITY name="MATUSETRANS"> 
     <INDEXES>   
      <INDEX name="IDX_MT_1">WONUM, SITEID</INDEX> 
     </INDEXES> 
     <COLUMNS> 
      <COLUMN displaykey="Y" uniquekey="Y">MATUSETRANSID</COLUMN> 
      <COLUMN>WORKORDERID</COLUMN> 
      <COLUMN>WONUM</COLUMN> 
      <COLUMN>DESCRIPTION</COLUMN> 
      <COLUMN>LINETYPE</COLUMN> 
      <COLUMN>ITEMNUM</COLUMN> 
      <COLUMN>QUANTITY</COLUMN> 
      <COLUMN>UNITCOST</COLUMN> 
      <COLUMN>TRANSDATE</COLUMN> 
      <COLUMN>ISSUETYPE</COLUMN> 
      <COLUMN>ISSUETO</COLUMN> 
      <COLUMN>BINNUM</COLUMN> 
      <COLUMN>LOTNUM</COLUMN> 
      <COLUMN>STORELOC</COLUMN> 
      <COLUMN>ASSETNUM</COLUMN> 
      <COLUMN>LOCATION</COLUMN> 
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>ORGID</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION>offline/getMyMatUseTransJson.action</INIT_ACTION> 
     <DELTA_ACTION>offline/getDeltaMyMatUseTransJson.action</DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="WORKORDER" transentitykey="WORKORDERID"> 
      <ACTION name="INSERT" beanname="OfflineDataSyncAction" methodname="addMatUseTrans"/> 
     </SYNC_ACTIONS> 
    </ENTITY> 
    <ENTITY name="WORKLOG"> 
     <INDEXES>   
      <INDEX name="IDX_WL_1">WONUM, SITEID</INDEX> 
     </INDEXES> 
     <COLUMNS> 
      <COLUMN displaykey="Y" uniquekey="Y">WORKLOGID</COLUMN> 
      <COLUMN>WONUM</COLUMN> 
      <COLUMN>WORKORDERID</COLUMN> 
      <COLUMN>RECORDKEY</COLUMN> 
      <COLUMN>DESCRIPTION</COLUMN> 
      <COLUMN>LONGDESCRIPTION</COLUMN> 
      <COLUMN>CLASS</COLUMN> 
      <COLUMN>CREATEBY</COLUMN> 
      <COLUMN>CREATEDATE</COLUMN> 
      <COLUMN>LOGTYPE</COLUMN> 
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>ORGID</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION>offline/getMyWorkLogListJson.action</INIT_ACTION> 
     <DELTA_ACTION>offline/getDeltaMyWorkLogListJson.action</DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="WORKORDER" transentitykey="WORKORDERID"> 
      <ACTION name="INSERT" beanname="OfflineDataSyncAction" methodname="addWorkLog"/> 
     </SYNC_ACTIONS> 
    </ENTITY> 
    <ENTITY name="FAILUREREPORT"> 
     <INDEXES>   
      <INDEX name="IDX_FR_1">WORKORDERID</INDEX> 
     </INDEXES> 
     <COLUMNS> 
      <COLUMN uniquekey="Y">WORKORDERID</COLUMN> 
      <COLUMN displaykey="Y" >WONUM</COLUMN> 
      <COLUMN>FAILURECODE</COLUMN> 
      <COLUMN>PROBLEMCODE</COLUMN> 
      <COLUMN>CAUSECODE</COLUMN> 
      <COLUMN>REMEDYCODE</COLUMN> 
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>ORGID</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION>offline/getMyFailureRptListJson.action</INIT_ACTION> 
     <DELTA_ACTION>offline/getDeltaMyFailureRptListJson.action</DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="WORKORDER" transentitykey="WORKORDERID"> 
      <ACTION name="EDIT" beanname="OfflineDataSyncAction" methodname="editFailureReport"/> 
     </SYNC_ACTIONS> 
    </ENTITY> 
    <ENTITY name="MULTIASSETLOCCI"> 
     <INDEXES>   
      <INDEX name="IDX_MULTI_1">WORKORDERID</INDEX> 
     </INDEXES> 
     <COLUMNS> 
      <COLUMN displaykey="Y" uniquekey="Y">MULTIID</COLUMN> 
      <COLUMN>SEQUENCE</COLUMN> 
      <COLUMN>RECORDKEY</COLUMN> 
      <COLUMN>WORKORDERID</COLUMN> 
      <COLUMN>ASSETNUM</COLUMN> 
      <COLUMN>LOCATION</COLUMN> 
      <COLUMN>ROUTE</COLUMN> 
      <COLUMN>ROUTESTOP</COLUMN> 
      <COLUMN>TARGETDESC</COLUMN> 
      <COLUMN>COMMENTS</COLUMN> 
      <COLUMN>PROGRESS</COLUMN> 
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>ORGID</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION>offline/getMyMultiAssetLocListJson.action</INIT_ACTION> 
     <DELTA_ACTION>offline/getDeltaMyMultiAssetLocListJson.action</DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="WORKORDER" transentitykey="WORKORDERID"> 
      <ACTION name="EDIT_PRG" beanname="OfflineDataSyncAction" methodname="editMultiProgress"/> 
     </SYNC_ACTIONS> 
    </ENTITY>  
    <ENTITY name="INVENTORY"> 
     <INDEXES> 
      <INDEX name="IDX_INV_1">ITEMNUM, SITEID</INDEX> 
      <INDEX name="IDX_INV_2">ITEMNUM</INDEX> 
      <INDEX name="IDX_INV_3">ITEMNUM, LOCATION</INDEX> 
      <INDEX name="IDX_INV_4">SITEID</INDEX> 
     </INDEXES> 
     <COLUMNS> 
      <COLUMN displaykey="Y" uniquekey="Y">INVENTORYID</COLUMN> 
      <COLUMN>ITEMNUM</COLUMN> 
      <COLUMN>ITEMSETID</COLUMN> 
      <COLUMN>LOCATION</COLUMN> 
      <COLUMN>DESCRIPTION</COLUMN> 
      <COLUMN>CATEGORY</COLUMN> 
      <COLUMN>MANUFACTURER</COLUMN> 
      <COLUMN>MODELNUM</COLUMN> 
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>STATUS</COLUMN> 
      <COLUMN>STATUSDATE</COLUMN> 
      <COLUMN>BINNUM</COLUMN> 
      <COLUMN>ISSUEUNIT</COLUMN> 
      <COLUMN>ISSUEYTD</COLUMN> 
      <COLUMN>ISSUE1YRAGO</COLUMN> 
      <COLUMN>LASTISSUEDATE</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION>offline/getAllInventoryJson.action</INIT_ACTION> 
     <DELTA_ACTION>offline/getDeltaInventoryListJson.action</DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="INVENTORY" transentitykey="INVENTORYID"> 
      <ACTION name="UPDATE_STATUS" beanname="OfflineDataSyncAction" methodname="updateInventoryStatus"/> 
     </SYNC_ACTIONS> 
    </ENTITY>   
    <ENTITY name="INVBALANCES"> 
     <INDEXES> 
      <INDEX name="IDX_INVBAL_1">ITEMNUM, SITEID</INDEX> 
      <INDEX name="IDX_INVBAL_2">ITEMNUM</INDEX> 
      <INDEX name="IDX_INVBAL_3">ITEMNUM, LOCATION</INDEX> 
      <INDEX name="IDX_INVBAL_4">SITEID</INDEX> 
      <INDEX name="IDX_INVBAL_5">BINNUM</INDEX> 
     </INDEXES> 
     <COLUMNS> 
      <COLUMN uniquekey="Y">INVBALANCESID</COLUMN> 
      <COLUMN displaykey="Y">ITEMNUM</COLUMN> 
      <COLUMN>ITEMSETID</COLUMN> 
      <COLUMN>LOCATION</COLUMN> 
      <COLUMN>DESCRIPTION</COLUMN> 
      <COLUMN>LOTTYPE</COLUMN> 
      <COLUMN>ITEMTYPE</COLUMN> 
      <COLUMN>STATUS</COLUMN> 
      <COLUMN>BINNUM</COLUMN> 
      <COLUMN>LOTNUM</COLUMN> 
      <COLUMN>CURBAL</COLUMN> 
      <COLUMN>PHYSCNT</COLUMN> 
      <COLUMN>PHYSCNTDATE</COLUMN> 
      <COLUMN>RECONCILED</COLUMN> 
      <COLUMN>SITEID</COLUMN> 
      <COLUMN>ORGID</COLUMN> 
     </COLUMNS> 
     <INIT_ACTION>offline/getInvBalancesJson.action</INIT_ACTION> 
     <DELTA_ACTION>offline/getDeltaInvBalancesJson.action</DELTA_ACTION> 
     <SYNC_ACTIONS transentityname="INVBALANCES" transentitykey="INVBALANCESID"> 
      <ACTION name="UPDATE_PHYSCNT" beanname="OfflineDataSyncAction" methodname="adjustPhysicalCount"/> 
     </SYNC_ACTIONS> 
    </ENTITY>  
</ENTITY_DEFS> 

</EZMAXMOBILE_OFFLINE_PROPERTIES>

這是我跑的類來解讀我的XML。

import java.io.File; 

import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBException; 
import javax.xml.bind.Unmarshaller; 

import com.interpro.Objects.*; 
public class run { 

/** 
* @param args 
*/ 
public static void main(String[] args) { 
    try { 

     File file = new File("C:/Development/workspace/com.interpro.xml/src/XML/offlineconfig.xml"); 
     JAXBContext jaxbContext = JAXBContext.newInstance(EZMAXMOBILE_OFFLINE_PROPERTIES.class); 

     Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); 
     EZMAXMOBILE_OFFLINE_PROPERTIES emm = (EZMAXMOBILE_OFFLINE_PROPERTIES) jaxbUnmarshaller.unmarshal(file); 
     System.out.println(); 

     } catch (JAXBException e) { 
     e.printStackTrace(); 
     } 


}

}

這裏有一些類，我產生。

package com.interpro.Objects; 

import javax.xml.bind.annotation.XmlAttribute; 
import javax.xml.bind.annotation.XmlElement; 
import javax.xml.bind.annotation.XmlRootElement; 
import javax.xml.bind.annotation.XmlType; 
@XmlRootElement(name = "EZMAXMOBILE_OFFLINE_PROPERTIES") 
@XmlType(propOrder = {"entity_defs", "selection_defs", "tx_settings", "offline_file_cache"}) 
public class EZMAXMOBILE_OFFLINE_PROPERTIES { 
private String synctime; 
private ENTITY_DEFS entity_defs; 
public ENTITY_DEFS getEntity_defs() { 
    return entity_defs; 
} 
@XmlElement 
public void setEntity_defs(ENTITY_DEFS entity_defs) { 
    this.entity_defs = entity_defs; 
} 

public SELECTION_DEFS getSelection_defs() { 
    return selection_defs; 
} 
@XmlElement 
public void setSelection_defs(SELECTION_DEFS selection_defs) { 
    this.selection_defs = selection_defs; 
} 

public TX_SETTINGS getTx_settings() { 
    return tx_settings; 
} 
@XmlElement 
public void setTx_settings(TX_SETTINGS tx_settings) { 
    this.tx_settings = tx_settings; 
} 

public OFFLINE_FILE_CACHE getOffline_file_cache() { 
    return offline_file_cache; 
} 
@XmlElement 
public void setOffline_file_cache(OFFLINE_FILE_CACHE offline_file_cache) { 
    this.offline_file_cache = offline_file_cache; 
} 

private SELECTION_DEFS selection_defs; 
private TX_SETTINGS tx_settings; 
private OFFLINE_FILE_CACHE offline_file_cache; 

public String getSynctime() { 
    return synctime; 
} 
@XmlAttribute 
public void setSynctime(String synctime) { 
    this.synctime = synctime; 
}

} 的EZMAXMOBILE_OFFLINE_PROPERTIES類應該產生Entity_defs對象

package com.interpro.Objects; 

import java.util.ArrayList; 

import javax.xml.bind.annotation.XmlElement; 

public class ENTITY_DEFS { 
private ArrayList<ENTITY> entitylist; 

public ArrayList<ENTITY> getEntitylist() { 
    return entitylist; 
} 
@XmlElement 
public void setEntitylist(ArrayList<ENTITY> entitylist) { 
    this.entitylist = entitylist; 
}

} 內。然後ENTITY_DEFS應該讓實體對象的列表。

package com.interpro.Objects; 

import java.util.ArrayList; 

import javax.xml.bind.annotation.XmlAttribute; 
import javax.xml.bind.annotation.XmlElement; 

public class ENTITY { 
private String name; 

public String getName() { 
    return name; 
}@XmlAttribute 
public void setName(String name) { 
    this.name = name; 
} 

private INDEXES indexes; 

public INDEXES getIndexes() { 
    return indexes; 
}@XmlElement 
public void setIndexes(INDEXES indexes) { 
    this.indexes = indexes; 
} 

public COLUMNS getColumns() { 
    return columns; 
}@XmlElement 
public void setColumns(COLUMNS columns) { 
    this.columns = columns; 
} 

public INIT_ACTION getInit_action() { 
    return init_action; 
}@XmlElement 
public void setInit_action(INIT_ACTION init_action) { 
    this.init_action = init_action; 
} 

public DELTA_ACTION getDelta_action() { 
    return delta_action; 
}@XmlElement 
public void setDelta_action(DELTA_ACTION delta_action) { 
    this.delta_action = delta_action; 
} 

public SYNC_ACTION getSync_action() { 
    return sync_action; 
}@XmlElement 
public void setSync_action(SYNC_ACTION sync_action) { 
    this.sync_action = sync_action; 
} 

private COLUMNS columns; 
private INIT_ACTION init_action; 
private DELTA_ACTION delta_action; 
private SYNC_ACTION sync_action;

}

來源

2014-02-14 Derek Parker

可以填充你的對象模型，然後元帥它得到了什麼JAXB當前希望作爲XML輸入感。以快速瀏覽你的模型你會需要至少在以下幾點：

使用@XmlElement批註指定您希望根據你的字段映射，因爲默認名稱的元素名稱/屬性不去匹配。
由於您的收藏具有分組元素，因此您可以利用@XmlElementWrapper註釋。

來源

2014-02-14 20:18:16

所以我通過打印出我的xml意識到這是一個命名約定問題。我只是不確定註釋是否使用。我看到你有一些關於這個的博客。你會碰巧有一個指導，深入解釋註釋？ –

@DerekParker - 我的大部分博客（http://blog.bdoughan.com/）都是致力於JAXB的。對於你的用例'@ XmlElement'，'@ XmlAttribute'和'@ XmlElementWrapper'將會爲你帶來最多（如果不是全部的話）。我的建議是從根對象開始，然後按照你的方式工作。 –

我遇到了特定情況下的問題。我試圖按照http://stackoverflow.com/questions/10940267/jaxb-xmlmixed-usage-for-reading-xmlvalue-and-xmlelement。但仍然遇到困難。這是我當前問題上的最新帖子.http：//stackoverflow.com/questions/21858116/xmlmixed-how-to-use –

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