Here is the code that can help you out:
public String getJSONFromResultSet(ResultSet rs,String keyName) {
Map json = new HashMap();
List list = new ArrayList();
if(rs!=null)
{
try {
ResultSetMetaData metaData = rs.getMetaData();
while(rs.next())
{
Map<String,Object> columnMap = new HashMap<String, Object>();
for(int columnIndex=1;columnIndex<=metaData.getColumnCount();columnIndex++)
{
if(rs.getString(metaData.getColumnName(columnIndex))!=null)
columnMap.put(metaData.getColumnLabel(columnIndex), rs.getString(metaData.getColumnName(columnIndex)));
else
columnMap.put(metaData.getColumnLabel(columnIndex), "");
}
list.add(columnMap);
}
} catch (SQLException e) {
e.printStackTrace();
}
json.put(keyName, list);
}
return JSONValue.toJSONString(json);
}
Pass the resultset and your keyname into argument and get the Json String in response.