ZOOKEEPER-4464: zooinspector display "Ephemeral Owner" in hex for easy match to jmx session

zooinspector now show "Ephemeral Owner" in 10 base number while JMX connections show in hex format. this makes it a little hard to match them.

It will be much better if hex format is shown too, I will create a pr add hex format just beside the 10 based one.

Author: 67 <67@gd67.com>

Reviewers: Enrico Olivelli <eolivelli@apache.org>, Mohammad Arshad <arshad@apache.org>, Mate Szalay-Beko <symat@apache.org>

Closes #1813 from iamgd67/ZOOKEEPER-4464

zookeeper-contrib/zookeeper-contrib-zooinspector/src/main/java/org/apache/zookeeper/inspector/gui/nodeviewer/NodeViewerMetaData.java

@@ -118,7 +118,7 @@ public class NodeViewerMetaData extends ZooInspectorNodeViewer {
                     for (Map.Entry<String, String> entry : data.entrySet()) {
                         rowPos = 2 * i + 1;
                         JLabel label = new JLabel(entry.getKey());
-                        JTextField text = new JTextField(entry.getValue());
+                        JTextField text = new JTextField(formatValByKeyType(entry.getKey(),entry.getValue()));
                         text.setEditable(false);
                         GridBagConstraints c1 = new GridBagConstraints();
                         c1.gridx = 0;
@@ -164,6 +164,21 @@ public class NodeViewerMetaData extends ZooInspectorNodeViewer {
                     NodeViewerMetaData.this.metaDataPanel.revalidate();
                     NodeViewerMetaData.this.metaDataPanel.repaint();
                 }
+
+                private String formatValByKeyType(String key, String value) {
+                    if(key==null) return value;
+                    String formatedVal=value;
+                    switch (key){
+                        case "Ephemeral Owner":
+                            try{
+                                formatedVal = String.format("0x%x", Long.parseLong(value));
+                            }catch (NumberFormatException e){
+                                LoggerFactory.getLogger().warn("parse {}'s value {} to hex fail",key,value,e);
+                            }
+                            break;
+                    }
+                    return formatedVal;
+                }
             };
             worker.execute();
         }