如何读取base64 xml格式的数据以及如何在Java中获取值

Question

In my table i'm maintains one xml column in that column data is in base64 xml format,so now i got this column with query.

Now how to read xml format data.

here my code:

public Object readingSqlResultedRecord(ResultSet result){

try {
Query q="select xml from empdata";
String xml = result.getString(1);
System.out.println("----xml----"+xml);
}catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

and my column is

<?xml version="1.0" encoding="UTF-8"?>
<event id="370e7324-3-85ec-63dac16aacb6">
<properties>
<property enc="BASE64" name="CHEF:description-html" value="ZmhfrtRo"/>
<property enc="BASE64" name="DAV:name" value="Q2FsZWmnmewqzRlYXI="/>
</properties>
</event>

How to read XML and how to get name value with string format.

Answer 1

this code will help you get the id attribute of event. It will work the same way for other nodes / attributes. A good start tutorial :

File fXmlFile = new File("path_to_your_xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
NodeList nList = doc.getElementsByTagName("event");
String id = nList.getAttributes().getNamedItem("id").getNodeValue();

and then the decoding is supported in Java 8 ( java.util.Base64, java.util.Base64.Encoder and java.util.Base64.Decoder ). so all you need to do is:

byte[] decode= Base64.getDecoder().decode(id); 

Answer 2

If I understood your question, your column contains a Base64 value. When you do:

String xml = result.getString(1);

Variable xml has a Base64 value . So, first you should decode xml variable value.You should use this snippet:

String decodeXmlValue = BaseEncoding.base64().decode(xml)

If decodeXmlValue contains a XML string, you should unmarshaller the XML value, take a look to Mashaller java documentation .

Base64 library can be included in your project from maven using this dependency . If you are not using maven in your project, you will be able to download the jar from here and include in your project.