Java 将xml文档导入到jaxb创建的实体结构中
我试图使用jaxb将xml文档导入到由jaxb创建的实体结构中。我下载并正在使用该下载中包含的创建封送处理示例,但我将Java 将xml文档导入到jaxb创建的实体结构中,java,xml,jaxb,xsd,Java,Xml,Jaxb,Xsd,我试图使用jaxb将xml文档导入到由jaxb创建的实体结构中。我下载并正在使用该下载中包含的创建封送处理示例,但我将po.xsd的内容更改为以下内容: <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="businessDocument" type="BusinessDocument"/> <xsd:complexType name="CompoundI
po.xsd
的内容更改为以下内容:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="businessDocument" type="BusinessDocument"/>
<xsd:complexType name="CompoundId">
<xsd:attribute name="root" type="xsd:string"/>
<xsd:attribute name="extension" type="xsd:string"/>
</xsd:complexType>
<xsd:complexType name="EntityType1">
<xsd:sequence>
<xsd:element name="typeId" type="CompoundId"/>
<xsd:element name="entityTitle" type="xsd:string"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="BusinessDocument">
<xsd:sequence>
<xsd:element name="typeId" type="CompoundId"/>
<xsd:element ref="documentTitle" minOccurs="1"/>
<xsd:element name="entity1" type="EntityType1"/>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
我将Main.java
更改为以下格式,以便将po.xml
导入到实体结构中,该实体结构是使用create marshal
samplebuild.xml
文件从po.xsd
创建的:
package mainpackage;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import primer.po.*;
import java.io.*;
public class Main {
public static void main( String[] args ) {
String filename = "C:\\Temp\\jaxb\\apps\\create-marshal\\po.xml";
InputStream is = getInputStream(filename);
try { unmarshal(BusinessDocument.class, is);}
catch (JAXBException e) {e.printStackTrace();}
}
public static InputStream getInputStream(String filename){
InputStream is = null;
try {
is = new FileInputStream(filename);
is.close();
}
catch (FileNotFoundException e) {e.printStackTrace();}
catch (IOException e) {e.printStackTrace();}
return is;
}
public static <T> T unmarshal( Class<T> docClass, InputStream inputStream )throws JAXBException {
String packageName = docClass.getPackage().getName();
JAXBContext jc = JAXBContext.newInstance( packageName );
Unmarshaller u = jc.createUnmarshaller();
JAXBElement<T> doc = (JAXBElement<T>)u.unmarshal( inputStream );
return doc.getValue();
}
}
你的问题在这里:
is = new FileInputStream(filename);
is.close();
因此,您尝试使用FileInputStream
从文件中解组XML,但是您关闭是在解组之前还是之后
更新
我从未将XSD用于JAXB,只是在域类上使用它的注释,但您的XSD仍然是错误的。尝试从XSD开头删除documentTitle
元素。添加了一些关于XSD的评论。除了您的建议,我还必须更改po.xsd
顶部的前两个xsd:element
声明的顺序,以便
在
之前删除
只会抛出另一个错误,但我通过重新排序这两个xsd:element
声明来解决问题,根据我的评论。您的xsd
中似乎存在documentTitle
问题。您有ref
,但在任何地方都找不到定义。我使用了您的xsd(添加了文档标题)和xml。使用eclipse生成类,工作正常。希望清除类文件并重新生成可以解决问题。很好,很高兴你解决了这个奇怪的问题。如果你真的觉得他们有帮助,你可以投票!!
<!--compile Java source files-->
<target name="compile" description="Compile all Java source files">
<echo message="Compiling the schema..." />
<mkdir dir="gen-src" />
<mkdir dir="gen-src/primer/po" />
<xjc schema="po.xsd" package="primer.po" destdir="gen-src">
<produces dir="gen-src/primer/po" includes="**/*.java" />
</xjc>
<echo message="Compiling the java source files..." />
<mkdir dir="classes" />
<javac destdir="classes" debug="on">
<src path="src" />
<src path="gen-src" />
<classpath refid="classpath" />
</javac>
</target>
javax.xml.bind.UnmarshalException
- with linked exception:
[java.io.IOException: Read error]
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:203)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:173)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:137)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:184)
at mainpackage.Main.unmarshal(Main.java:39)
at mainpackage.Main.main(Main.java:17)
Caused by: java.io.IOException: Read error
at java.io.FileInputStream.read(Native Method)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager$RewindableInputStream.read(XMLEntityManager.java:2932)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:704)
at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:186)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:772)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:200)
... 5 more
is = new FileInputStream(filename);
is.close();