add jconsole plugin

src/main/java/com/alibaba/druid/support/jconsole/DruidDataSourcePanel.java

@@ -0,0 +1,7 @@
+package com.alibaba.druid.support.jconsole;
+
+public class DruidDataSourcePanel extends DruidPanel {
+
+    private static final long serialVersionUID = 1L;
+
+}

src/main/java/com/alibaba/druid/support/jconsole/DruidDriverPanel.java

@@ -0,0 +1,7 @@
+package com.alibaba.druid.support.jconsole;
+
+public class DruidDriverPanel extends DruidPanel {
+
+    private static final long serialVersionUID = 1L;
+
+}

src/main/java/com/alibaba/druid/support/jconsole/DruidPanel.java

@@ -0,0 +1,21 @@
+package com.alibaba.druid.support.jconsole;
+
+import javax.management.MBeanServerConnection;
+import javax.swing.JPanel;
+
+import com.sun.tools.jconsole.JConsoleContext;
+
+public class DruidPanel extends JPanel {
+
+    private static final long serialVersionUID = 1L;
+
+    protected Object doInBackground(JConsoleContext context) throws Exception {
+        doInBackground(context.getMBeanServerConnection());
+
+        return null;
+    }
+    
+    protected void doInBackground(MBeanServerConnection conn) throws Exception {
+        System.out.println("doInBackground");
+    }
+}

src/main/java/com/alibaba/druid/support/jconsole/DruidPlugin.java

@@ -0,0 +1,47 @@
+package com.alibaba.druid.support.jconsole;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import javax.swing.JPanel;
+import javax.swing.SwingWorker;
+
+import com.sun.tools.jconsole.JConsolePlugin;
+
+public class DruidPlugin extends JConsolePlugin {
+
+    private final Map<String, JPanel> tabs = new LinkedHashMap<String, JPanel>();
+
+    public DruidPlugin(){
+        tabs.put("Druid-Driver", new DruidDriverPanel());
+        tabs.put("Druid-DataSource", new DruidDataSourcePanel());
+        tabs.put("Druid-SQL", new DruidSQLPanel());
+    }
+
+    @Override
+    public Map<String, JPanel> getTabs() {
+        return tabs;
+    }
+
+    @Override
+    public SwingWorker<?, ?> newSwingWorker() {
+        SwingWorker<?, ?> worer = new SwingWorker<Object, Object>() {
+
+            @Override
+            protected Object doInBackground() throws Exception {
+                return DruidPlugin.this.doInBackground();
+            }
+        };
+
+        return worer;
+    }
+
+    protected Object doInBackground() throws Exception {
+        for (JPanel panel : tabs.values()) {
+            ((DruidPanel) panel).doInBackground(this.getContext());
+        }
+        
+        return null;
+    }
+
+}

src/main/java/com/alibaba/druid/support/jconsole/DruidSQLPanel.java

@@ -0,0 +1,8 @@
+package com.alibaba.druid.support.jconsole;
+
+
+public class DruidSQLPanel extends DruidPanel {
+
+    private static final long serialVersionUID = 1L;
+
+}