Question

I have a huge text file and I wanted to write a program which can extract only the XMLs from the file and save it.

Is there a direct API or better solution than splitting/trimming the string read from the file.

Example:
small part of the file:

#---------- #1 :  ----------#
<MSG_INFO>
<message type="TextMessage" messageSelector="" originationTimestamp="" receiveTime="" jmsServerTimestamp="" jmsMsgExpiration="">
    <header JMSDestinationType="Generic" JMSDeliveryMode="2" />
    <properties>
        <property name="messageTopic" type="String">xyz</property>
    </properties>
</message>

 BodyLength=1476
<?xml version="1.0"?>
<catalog>
<book id="bk101">
  <author>Gambardella, Matthew</author>
  <title>XML Developer's Guide</title>
  <genre>Computer</genre>
  <price>44.95</price>
  <publish_date>2000-10-01</publish_date>
  <description>An in-depth look at creating applications 
  with XML.</description>
</book>
<book id="bk102">
  <author>Ralls, Kim</author>
  <title>Midnight Rain</title>
  <genre>Fantasy</genre>
  <price>5.95</price>
  <publish_date>2000-12-16</publish_date>
  <description>A former architect battles corporate zombies, 
  an evil sorceress, and her own childhood to become queen 
  of the world.</description>
</book>

Answer 1

Regular expression was the answer.

String[] newXml = xml.split("\\<\\?");
    ArrayList<String> xmlList = new ArrayList<>(Arrays.asList(newXml));
    for(int i = 0; i<xmlList.size();i++){
        if(!xmlList.get(i).contains("xml version=\"1.0\" encoding=\"UTF-8\"")){
            xmlList.remove(i);
        }

    }
    for(int j = 0;j<xmlList.size();j++){
        xmlList.set(j, "<?"+xmlList.get(j));
        xmlList.set(j,xmlList.get(j).split("\\#")[0]);
    }


    return xmlList;