如何在java中使用XML Data创建XSD文件
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我有像这样的XML数据
<Data><CustomerDetails><CustomerName>ABCD</CustomerName><CusomerACCTNumber>12121212</CusomerACCTNumber></CustomerDetails><BillDetails><BillTxDetails><BillID>121212</BillID><BillDate>12-May-2015</BillDate><Time>12:55AM</Time></BillTxDetails><BillTxDetails><BillID>121212</BillID><BillDate>12-May-2015</BillDate><Time>5:55AM</Time></BillTxDetails></BillDetails></Data>
如何使用java创建xsd文件？以及如何为上面的xml数据创建java类（pojo / bean）？我试过这种方式
public class CustomerDetails {
private String CustomerName;
private String CusomerACCTNumber;
// ==> setters and getters
}
public class BillTxDetails {
private String BillID;
private String BillDate;
private String Time;
// ==> setters and getters
}
public static void main(String ...) {
Class[] c = new Class[] { CustomerDetails.class, BillTxDetails.class };
JAXBContext jc =JAXBContext.newInstance(Data.class);
jc.generateSchema(new SchemaOutputResolver() {
@Override
public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
StreamResult result = new StreamResult(System.out);
result.setSystemId(suggestedFileName);
return result
}
});
}
但仍然没有进入XSD根元素谢谢
答案
如果你正在使用eclipse你可以做以下。
- 在任何项目中创建XML文件。
- 右键单击XML文件，单击生成模式。
- 给它起个名字
尝试从XML生成模式时，我得到以下内容
<?xml version="1.0" encoding="UTF-8"?><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="BillDetails">
<xsd:complexType>
<xsd:sequence>
<xsd:element maxOccurs="unbounded" ref="BillTxDetails"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="Data">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="CustomerDetails"/>
<xsd:element ref="BillDetails"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="CustomerDetails">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="CustomerName"/>
<xsd:element ref="CusomerACCTNumber"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="Time" type="xsd:string"/>
<xsd:element name="BillTxDetails">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="BillID"/>
<xsd:element ref="BillDate"/>
<xsd:element ref="Time"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="BillID" type="xsd:string"/>
<xsd:element name="BillDate" type="xsd:string"/>
<xsd:element name="CustomerName" type="xsd:string"/>
<xsd:element name="CusomerACCTNumber" type="xsd:string"/>
</xsd:schema>
然后右键单击xsd并选择generate java classes
另一答案
您的起点应该是XSD文件。您可以使用在线XSD生成器从XML构建一个：http://www.freeformatter.com/xsd-generator.html
您还可以使用像Trang http://www.thaiopensource.com/relaxng/trang.html这样的工具
或者，如果您想构建自己的XSD生成器，请查看此链接Generate XSD programmatically in java
最后，这里有一些可能有帮助的JAXB示例......
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.SchemaOutputResolver;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.transform.Result;
import javax.xml.transform.stream.StreamResult;
import org.xml.sax.InputSource;
import com.sun.codemodel.JCodeModel;
import com.sun.tools.xjc.api.S2JJAXBModel;
import com.sun.tools.xjc.api.SchemaCompiler;
import com.sun.tools.xjc.api.XJC;
public class Demo {
public static void buildClasses(File xsdFile) throws IOException {
SchemaCompiler sc = XJC.createSchemaCompiler();
sc.parseSchema(new InputSource(xsdFile.toURI().toString()));
S2JJAXBModel model = sc.bind();
JCodeModel cm = model.generateCode(null, null);
cm.build(new File("."));
}
public static final void printFile(File file) throws IOException {
BufferedReader reader = new BufferedReader(new FileReader(file));
String line = null;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
reader.close();
}
public static void main(String[] args) {
try {
Example example;
File xmlFile = new File("example.xml");
File xsdFile = new File("example.xsd");
JAXBContext jaxbContext = JAXBContext.newInstance(Example.class);
////////////////////////////////////////////////////////////////////////////////////
// USE THIS CODE TO BUILD YOUR XML FROM AN EXISTING INSTANTIATED JAVA CLASS
////////////////////////////////////////////////////////////////////////////////////
System.out.println("===========================================");
example = new Example();
example.id = 123;
example.name = "Constantin";
example.dob = new SimpleDateFormat("yyyy-MM-dd").parse("1971-01-13");
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.marshal(example, xmlFile);
printFile(xmlFile);
System.out.println("===========================================");
////////////////////////////////////////////////////////////////////////////////////
// USE THIS CODE TO BUILD YOUR XSD FROM AN EXISTING JAVA CLASS
////////////////////////////////////////////////////////////////////////////////////
System.out.println("===========================================");
jaxbContext.generateSchema(new SchemaOutputResolver() {
@Override
public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
StreamResult result = new StreamResult(new FileOutputStream(xsdFile));
result.setSystemId(xsdFile.getAbsolutePath());
return result;
}
});
printFile(xsdFile);
System.out.println("===========================================");
////////////////////////////////////////////////////////////////////////////////////
// USE THIS CODE TO INSTANTIATE A JAVA CLASS FROM AN EXISTING XML FILE
////////////////////////////////////////////////////////////////////////////////////
System.out.println("===========================================");
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
example = (Example) jaxbUnmarshaller.unmarshal(xmlFile);
System.out.println("[" + example.getId() + "][" + example.getName() + "][" + example.getDOB() + "]");
System.out.println("===========================================");
////////////////////////////////////////////////////////////////////////////////////
// USE THIS CODE TO BUILD JAVA CLASSES FROM EXISTING XSD FILE
////////////////////////////////////////////////////////////////////////////////////
buildClasses(xsdFile);
}
catch (JAXBException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
catch (ParseException e) {
e.printStackTrace();
}
}
}
@XmlRootElement
class Example {
int id;
String name;
Date dob;
@XmlElement
public void setId(int id) {
this.id = id;
}
public int getId() {
return id;
}
@XmlElement
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
@XmlElement
public void setDOB(Date dob) {
this.dob = dob;
}
public Date getDOB() {
return dob;
}
}
你可能需要下载一些依赖jar来使这个工作：https://jaxb.java.net/2.2.11/
另一答案
我试过这种方式公共类CustomerDetails {private String CustomerName; private String CusomerACCTNumber; ==> setters and getters} public class BillTxDetails {private String BillID; private String BillDate; private String Time; ==> setters and getters} public static void main （Sring ....）{Class [] c = {CustomerDetails.class，BillTxDetails.class}; JAXBContext jc = JAXBContext.newInstance（Data.class）; jc.generateSchema（new SchemaOutputResolver（）{@ Override public Result createOutput（ String namespaceUri，String suggestedFileName）throws IOException {StreamResult result = new StreamResult（System.out）; r
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