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作者：dorothyle
以下为原文：

[原创]实现将本体文件存入数据库，再从数据库中读出，输出该本体中的所有类，所有属性及其对应属性的值

今天终于实现了将一个本体文件存储到数据库中，再从数据库中将文本文件读出来，输出该本体中的所有类，所有属性及其对应属性的值。 import java.util.Iterator; import com.hp.hpl.jena.db.DBConnection; import com.hp.hpl.jena.db.IDBConnection; import com.hp.hpl.jena.ontology.Individual; import com.hp.hpl.jena.ontology.OntClass; import com.hp.hpl.jena.ontology.OntModel; import com.hp.hpl.jena.ontology.OntModelSpec; import com.hp.hpl.jena.ontology.OntProperty; import com.hp.hpl.jena.rdf.model.Model; import com.hp.hpl.jena.rdf.model.ModelFactory; import com.hp.hpl.jena.rdf.model.ModelMaker; import com.hp.hpl.jena.util.iterator.ExtendedIterator; public class ReadOntologyFromMysql { public static final String strDriver = "com.mysql.jdbc.Driver"; public static final String strURL = "jdbc:mysql://localhost:3306/jena"; public static final String strUser = "root"; public static final String strPassword = "root"; public static final String strDB = "MySQL"; // 连接数据库 public static IDBConnection connectDB(String DBURL, String DBUSER, String DBPASSWORD, String DBTYPE){ try { Class.forName("com.mysql.jdbc.Driver"); System.out.print("数据库连接成功, 已经连接到"); }catch (ClassNotFoundException e){ e.printStackTrace(); System.out.println("数据库连接不成功"); } return new DBConnection(DBURL, DBUSER,DBPASSWORD,DBTYPE); } // 提取本体文件关于OWL架构等详细信息 public static OntModelSpec getModelSpec(ModelMaker maker) { OntModelSpec spec = new OntModelSpec(OntModelSpec.OWL_MEM); spec.setImportModelGetter(maker); return spec; } // 从文件读取本体并将其存入数据库 public static OntModel ceateDBModelFromFile(IDBConnection con, String name, String filePath){ ModelMaker maker = ModelFactory.createModelRDBMaker(con); Model base = maker.createModel(name); OntModel newmodel = ModelFactory.createOntologyModel(getModelSpec(maker),base); newmodel.read(filePath); System.out.println("已将本体文件存入数据库。"); System.out.println(); return newmodel; } // 从数据库中得到已存入本体 public static OntModel getModelFromDB(IDBConnection con, String name){ ModelMaker maker = ModelFactory.createModelRDBMaker(con); Model base = maker.getModel(name); OntModel newmodel = ModelFactory.createOntologyModel(getModelSpec(maker),base); System.out.println("已从数据库中读出本体文件。"); System.out.println(); return newmodel; } // 简单读取本体中的所有类 public static void SimpleReadOntology(OntModel model){ System.out.println("该本体文件中包括以下类："); for (Iterator i = model.listClasses(); i.hasNext();){ OntClass c = (OntClass) i.next(); System.out.println(" " + c.getLocalName()); } System.out.println(); } public static void main(String args[]){ IDBConnection con = connectDB(strURL, strUser, strPassword, strDB); System.out.println(con + ";"); System.out.println(); String filePath = "file:e:/ontologies/BeijingOpera/Costume.owl"; String prefix = "http://Costume.owl#"; OntModel defModel = ceateDBModelFromFile(con, "Costume", filePath); // 读取filePath目录下本体文件Costume的内容，将该本体文件的内容存储到数据库con中； OntModel model = getModelFromDB(con, "Costume"); // 将数据库con中存储的本体文件Costume的内容读出到一个本体文件Model中； SimpleReadOntology(model); OntClass CostumeClass = model.getOntClass(prefix + "Costume"); String name = CostumeClass.getLocalName(); //返回的是Costume本体中的类Costume的名字，是一个字符串； System.out.print("此处返回的是" + name + "类的名称"); System.out.println(name); System.out.println(); ExtendedIterator it = CostumeClass.listInstances(); System.out.println("此处返回的是" + name + "类的所有实例："); while (it.hasNext()) { Individual oi = (Individual) it.next(); System.out.println(" " + oi.getLocalName()); for (Iterator ipp = CostumeClass.listDeclaredProperties(); ipp.hasNext();){ OntProperty p = (OntProperty) ipp.next(); System.out.println(" associated property:" + p.getLocalName() + ":" + oi.getPropertyValue(p)); } } } } 以上代码执行后，控制台的输出如下：数据库连接成功, 已经连接到com.hp.hpl.jena.db.DBConnection@157f0dc; 已将本体文件存入数据库。 已从数据库中读出本体文件。 该本体文件中包括以下类： Costume Document Image Master 此处返回的是Costume类的名称Costume 此处返回的是Costume类的所有实例： HongTuanLongMang associated property:kind:Mang^^http://www.w3.org/2000/01/rdf-schema#Literal associated property:image:null associated property:pattern:SanJianShui, Long^^http://www.w3.org/2000/01/rdf-schema#Literal associated property:daPei:null associated property:name:HuanTuanLongMang^^http://www.w3.org/2000/01/rdf-schema#Literal associated property:color:red^^http://www.w3.org/2000/01/rdf-schema#Literal associated property:hangDang:Sheng^^http://www.w3.org/2000/01/rdf-schema#Literal associated property:texture:DaDuan^^http://www.w3.org/2000/01/rdf-schema#Literal associated property:depiction:null associated property:style:DuiJin, YuanCollar^^http://www.w3.org/2000/01/rdf-schema#Literal HuangTuanLongMang associated property:kind:null associated property:image:null associated property:pattern:null associated property:daPei:null associated property:name:null associated property:color:null associated property:hangDang:null associated property:texture:null associated property:depiction:null associated property:style:null LvTuanLongMang associated property:kind:null associated property:image:null associated property:pattern:null associated property:daPei:null associated property:name:null associated property:color:null associated property:hangDang:null associated property:texture:null associated property:depiction:null associated property:style:null

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