我需要使用StAX解析XML文件。
我遇到了许多异常:
javax.xml.stream.XMLStreamException: java.net.MalformedURLException
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.setInputSource(XMLStreamReaderImpl.java:217)
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.<init>(XMLStreamReaderImpl.java:189)
at com.sun.xml.internal.stream.XMLInputFactoryImpl.getXMLStreamReaderImpl(XMLInputFactoryImpl.java:262)
at com.sun.xml.internal.stream.XMLInputFactoryImpl.createXMLStreamReader(XMLInputFactoryImpl.java:129)
at com.epam.lab.StaxXmlParser.<init>(StAXParserDemo.java:46)
at com.epam.lab.StAXParserDemo.main(StAXParserDemo.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.net.MalformedURLException
at java.net.URL.<init>(URL.java:619)
at java.net.URL.<init>(URL.java:482)
at java.net.URL.<init>(URL.java:431)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:610)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1290)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDocumentEntity(XMLEntityManager.java:1242)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.setInputSource(XMLDocumentScannerImpl.java:257)
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.setInputSource(XMLStreamReaderImpl.java:204)
这是XML文件的样子:
<?xml version="1.0" encoding="UTF-8"?>
<staff xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="newEmployee.xsd">
<employee>
<name>Carl Cracker</name>
<salary>75000</salary>
<hiredate year="1987" month="12" day="15" />
</employee>
<employee>
<name>Harry Hacker</name>
<salary>50000</salary>
<hiredate year="1989" month="10" day="1" />
</employee>
<employee>
<name>Tony Tester</name>
<salary>40000</salary>
<hiredate year="1990" month="3" day="15" />
</employee>
</staff>
以下是代码片段:
public class StAXParserDemo {
public static void main(String[] args) {
try {
StaxXmlParser staxXmlParser = new StaxXmlParser(EMPLOYEE_XML.getFilename());
List<Employee> employees = staxXmlParser.parseEmployee();
for (Employee emp : employees) {
System.out.println(emp);
}
} catch (Throwable e) {
e.printStackTrace();
}
}
}
class StaxXmlParser {
private List<Employee> employeeList;
private Employee currentEmployee;
private String tagContent;
private XMLStreamReader reader;
public StaxXmlParser(String filename) {
employeeList = null;
currentEmployee = null;
tagContent = null;
try {
XMLInputFactory factory = XMLInputFactory.newFactory();
reader = factory.createXMLStreamReader(ClassLoader.getSystemResourceAsStream(filename));
parseEmployee();
} catch (XMLStreamException e) {
e.printStackTrace();
}
}
public List<Employee> parseEmployee() throws XMLStreamException {
while (reader.hasNext()) {
int event = reader.next();
switch (event) {
case XMLStreamConstants.START_ELEMENT:
if ("employee".equals(reader.getLocalName())) {
currentEmployee = new Employee();
}
if ("staff".equals(reader.getLocalName())) {
employeeList = new ArrayList<>();
}
if ("hireday".equals(reader.getLocalName())) {
int yearAttr = Integer.parseInt(reader.getAttributeValue(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI, "year"));
int monthAttr = Integer.parseInt(reader.getAttributeValue(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI, "month"));
int dayAttr = Integer.parseInt(reader.getAttributeValue(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI, "day"));
currentEmployee.setHireDay(yearAttr, monthAttr, dayAttr);
}
break;
case XMLStreamConstants.CHARACTERS:
tagContent = reader.getText().trim();
break;
case XMLStreamConstants.END_ELEMENT:
switch (reader.getLocalName()) {
case "employee":
employeeList.add(currentEmployee);
break;
case "name":
currentEmployee.setName(tagContent);
break;
case "salary":
currentEmployee.setSalary(Double.parseDouble(tagContent));
break;
}
}
}
return employeeList;
}
}
更新:
根据建议,我改成了以下内容:
reader = factory.createXMLStreamReader(new FileInputStream(new File(filename)));
现在它打印出了以下输出:
Employee { name=Carl Cracker, salary=75000.0, hireDay=null }
Employee { name=Harry Hacker, salary=50000.0, hireDay=null }
Employee { name=Tony Tester, salary=40000.0, hireDay=null }
属性提取有什么问题?我将问题更改为新问题的
为什么会发生这种情况?有什么建议吗?
System.out.println(emp);
。尝试使用System.out.println(emp.getName()); System.out.println(emp.getSalary());
等等。 - StoopidDonuttoString()
方法。 - catch23