无法在 Stax 中使用 XMLEventReader 检查 XML 中的 CDATA
Unable to check CDATA in XML using XMLEventReader in Stax
我无法在 XML 中检查 CDATA 并使用 XMLEventReader 读取它。
示例如下:
<name>HEADERS</name>
<data>
<![CDATA[ Sat Nov 19 18:50:15 2016 (1672822)
]]>
<![CDATA[Sat, 19 Nov 2016 18:50:14 -0800 (PST)
]]>
</data>
我使用的Stax api的XMLEventReader如下:
while (eventReader.hasNext()) {
XMLEvent event = eventReader.nextEvent();
if (event.isCharacters()) {
System.out.println(event.asCharacters().isCData());
System.out.println(event.asCharacters().getData());
}
}
所以,当我读取字符的数据标签时,我得到 event.asCharacters().isCData() 的错误信息。想知道如何在 EventReader 中检查 CDATA 并获取 CDATA。
使用以下模式:
switch (EventType) {
case XMLStreamConstants.CHARACTERS:
case XMLStreamConstants.CDATA:
System.out.println(r.getText());
break;
default:
break;
}
完整示例:
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
public void readCDATAFromXMLUsingStax() {
String yourSampleFile = "/path/toYour/sample/file.xml";
XMLStreamReader r = null;
try (InputStream in =
new BufferedInputStream(new FileInputStream(yourSampleFile));) {
XMLInputFactory factory = XMLInputFactory.newInstance();
r = factory.createXMLStreamReader(in);
while (r.hasNext()) {
switch (r.getEventType()) {
case XMLStreamConstants.CHARACTERS:
case XMLStreamConstants.CDATA:
System.out.println(r.getText());
break;
default:
break;
}
r.next();
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (r != null) {
try {
r.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}
和/path/toYour/sample/file.xml
<data>
<![CDATA[ Sat Nov 19 18:50:15 2016 (1672822)]]>
<![CDATA[Sat, 19 Nov 2016 18:50:14 -0800 (PST)]]>
</data>
给出:
Sat Nov 19 18:50:15 2016 (1672822)
Sat, 19 Nov 2016 18:50:14 -0800 (PST)
设置属性,否则reader忽略CDATA的事件类型。
XMLInputFactory factory = XMLInputFactory.newInstance();
factory.setProperty(Constants.ZEPHYR_PROPERTY_PREFIX + Constants.STAX_REPORT_CDATA_EVENT,Boolean.TRUE);
参见 com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl,行:3027
我无法在 XML 中检查 CDATA 并使用 XMLEventReader 读取它。
示例如下:
<name>HEADERS</name>
<data>
<![CDATA[ Sat Nov 19 18:50:15 2016 (1672822)
]]>
<![CDATA[Sat, 19 Nov 2016 18:50:14 -0800 (PST)
]]>
</data>
我使用的Stax api的XMLEventReader如下:
while (eventReader.hasNext()) {
XMLEvent event = eventReader.nextEvent();
if (event.isCharacters()) {
System.out.println(event.asCharacters().isCData());
System.out.println(event.asCharacters().getData());
}
}
所以,当我读取字符的数据标签时,我得到 event.asCharacters().isCData() 的错误信息。想知道如何在 EventReader 中检查 CDATA 并获取 CDATA。
使用以下模式:
switch (EventType) {
case XMLStreamConstants.CHARACTERS:
case XMLStreamConstants.CDATA:
System.out.println(r.getText());
break;
default:
break;
}
完整示例:
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
public void readCDATAFromXMLUsingStax() {
String yourSampleFile = "/path/toYour/sample/file.xml";
XMLStreamReader r = null;
try (InputStream in =
new BufferedInputStream(new FileInputStream(yourSampleFile));) {
XMLInputFactory factory = XMLInputFactory.newInstance();
r = factory.createXMLStreamReader(in);
while (r.hasNext()) {
switch (r.getEventType()) {
case XMLStreamConstants.CHARACTERS:
case XMLStreamConstants.CDATA:
System.out.println(r.getText());
break;
default:
break;
}
r.next();
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (r != null) {
try {
r.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}
和/path/toYour/sample/file.xml
<data>
<![CDATA[ Sat Nov 19 18:50:15 2016 (1672822)]]>
<![CDATA[Sat, 19 Nov 2016 18:50:14 -0800 (PST)]]>
</data>
给出:
Sat Nov 19 18:50:15 2016 (1672822)
Sat, 19 Nov 2016 18:50:14 -0800 (PST)
设置属性,否则reader忽略CDATA的事件类型。
XMLInputFactory factory = XMLInputFactory.newInstance();
factory.setProperty(Constants.ZEPHYR_PROPERTY_PREFIX + Constants.STAX_REPORT_CDATA_EVENT,Boolean.TRUE);
参见 com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl,行:3027