我必须使用StAX解析XML文件.

我抓住了一堆例外：

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.(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.(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.(URL.java:619)

at java.net.URL.(URL.java:482)

at java.net.URL.(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文件如何loooks：

xsi:noNamespaceSchemaLocation="newEmployee.xsd">

Carl Cracker

75000

Harry Hacker

50000

Tony Tester

40000

这是代码片段：

public class StAXParserDemo {

public static void main(String[] args) {

try {

StaxXmlParser staxXmlParser = new StaxXmlParser(EMPLOYEE_XML.getFilename());

List employees = staxXmlParser.parseEmployee();

for (Employee emp : employees) {

System.out.println(emp);

}

} catch (Throwable e) {

e.printStackTrace();

}

}

}

class StaxXmlParser {

private List 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 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：

按照我改为下一个的建议：

reader = factory.createXMLStreamReader(new FileInputStream(new File(filename)));

现在它打印下一个输出：

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？我更接近新问题.

为什么会这样？有什么建议？

解决方法:

您的问题似乎与ClassLoader#getSystemResourceAsStream()有关.此方法将查找类路径中的资源,如果找不到,则会让您的XMLStreamReader抱怨MalformedURL.

选项：

>使用FileInputStream并提供文件的路径.

reader = factory.createXMLStreamReader(new FileInputStream(PATH_TO_XML));

>将您的xml添加到您的eclipse类路径中 – 运行方式 – >运行配置 – > Classpath – >单击用户条目,然后单击高级 – >添加外部文件夹(转到包含xml的文件夹)

标签：java,xml-parsing,xml,runtimeexception,stax

来源： https://codeday.me/bug/20190624/1280325.html