从mysql DB检索数据后如何创建XML文件？

Question

I want to create an XML file by same like given below after getting data from db like this: any help would be appreciated as I am newbie in XML file creation by java Servlet.

My XML file which i want to be created by a servlet:

   <?xml version="1.0" encoding="UTF-8"?>
      <root>
       <expanded>true</expanded>
     <children>
     <element>
        <text>Setup</text>
        <leaf>false</leaf>
        <iconCls>x-fa fa-gears</iconCls>
        <cls>mainNav</cls>
        <children>
            <element>
                <leaf>false</leaf>
                <text>Academics</text>
                <iconCls>x-fa fa-graduation-cap</iconCls>
                <cls>mainNav</cls>
                <children>
            <element>
                <leaf>true</leaf>
                <text>Session</text>
                <iconCls>x-fa fa-star</iconCls>
                <cls>PIU.view.setup.academics.AcademicSession</cls>
            </element>
            <element>
                <leaf>true</leaf>
                <text>Faculty</text>
                <iconCls>x-fa fa-star-o</iconCls>
                <cls>PIU.view.setup.academics.AcademicFaculty</cls>
            </element>
            <element>
                <leaf>true</leaf>
                <text>Shifts</text>
                <iconCls>x-fa fa-star-o</iconCls>
                <cls>PIU.view.setup.academics.MaintainShifts</cls>
            </element>
           </children>
            </element>
            <element>
                <leaf>false</leaf>
                <text>Institution</text>
                <iconCls>x-fa fa-university</iconCls>
                <cls>mainNav</cls>
            <children>
            <element>
                <leaf>true</leaf>
                <text>Institution</text>
                <iconCls>x-fa fa-globe</iconCls>
                <cls>PIU.view.setup.institution.DefineInstitution</cls>
            </element>
            <element>
                <leaf>true</leaf>
                <text>Facilities</text>
                <iconCls>x-fa fa-building</iconCls>
                <cls>PIU.view.setup.institution.MaintainFacilities</cls>
            </element>
            <element>
                <leaf>true</leaf>
                <text>Letter Head</text>
                <iconCls>x-fa fa-info</iconCls>
            </element>
          </children>
              </element>
           </children>
          </element>
        </children> 
     </root>

So far I have tried this which is not generated the result that I want please help me out:

   protected void doGet(HttpServletRequest request, HttpServletResponse 
    response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/xml");
    String reportName =  "GenerateXML_Report_"
            +System.currentTimeMillis()+".xml";     
    response.setHeader("Content-disposition", "attachment; " +
            "filename=" + reportName);   

    try{    
        Datasource ds=new Datasource();
        ds.connect();
        java.sql.Statement s=ds.createStatement();
        ResultSet rs = s.executeQuery("Select label,action,icon_cls,leaf from common_features where is_visible=1");

    ArrayList<String> rows = new ArrayList<String>();
    rows.add("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
    rows.add("<root>"); 
    rows.add("<expanded>true</expanded>");
    rows.add("<children>");
    while(rs.next()) 
    { 
        rows.add("<element>");
        rows.add("<leaf>");
        rows.add(rs.getString(4));
        rows.add("</leaf>");
        rows.add("<text>");
        rows.add(rs.getString(1));
        rows.add("</text>");
        rows.add("<iconCls>");
        rows.add(rs.getString(3));
        rows.add("</iconCls>");
        rows.add("<cls>");
        rows.add(rs.getString(2));
        rows.add("</cls>");
        rows.add("</element>");

    }
    rows.add("</children>");
    rows.add("</root>"); 

    Iterator<String> iter = rows.iterator();
    while (iter.hasNext()){
        String outputString = (String) iter.next();
        response.getOutputStream().print(outputString);
    }
    ds.dropConnection();  
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    //out.println(jobject);
    response.getOutputStream().flush();


}

currently my generated xml file looks like this:

  <?xml version="1.0" encoding="UTF-8"?>
<root>
 <expanded>true</expanded>
  <children>
    <element>
        <leaf>true</leaf>
        <text>Institution</text>
        <iconCls>x-fa fa-globe</iconCls>
        <cls>PIU.view.setup.institution.DefineInstitution</cls>
    </element>
    <element>
        <leaf>true</leaf>
        <text>Facilities</text>
        <iconCls>x-fa fa-building</iconCls>
        <cls>PIU.view.setup.institution.MaintainFacilities</cls>
    </element>
    <element>
        <leaf>true</leaf>
        <text>Session</text>
        <iconCls>x-fa fa-star</iconCls>
        <cls>PIU.view.setup.academics.AcademicSession</cls>
    </element>
    <element>
        <leaf>true</leaf>
        <text>Faculty</text>
        <iconCls>x-fa fa-star-o</iconCls>
        <cls>PIU.view.setup.academics.AcademicFaculty</cls>
    </element>
    <element>
        <leaf>true</leaf>
        <text>Shifts</text>
        <iconCls>x-fa fa-star-o</iconCls>
        <cls>PIU.view.setup.academics.MaintainShifts</cls>
    </element>
    <element>
        <leaf>false</leaf>
        <text>Setup</text>
        <iconCls>x-fa fa-gears</iconCls>
        <cls>mainNav</cls>
    </element>
    <element>
        <leaf>false</leaf>
        <text>Academics</text>
        <iconCls>x-fa fa-graduation-cap</iconCls>
        <cls>mainNav</cls>
    </element>
    <element>
        <leaf>false</leaf>
        <text>Institution</text>
        <iconCls>x-fa fa-university</iconCls>
        <cls>mainNav</cls>
      </element>
   </children>
 </root>

Answer 1

The way you are using for creation of XML file is wrong because you hardcode every thing in your code. Suppose you want to change your XML file in future. It will take too much time it will also very tedious for you to change your XML. So follow below document link for creating XML file it will help you to generate a XML File.

https://www.mkyong.com/java/how-to-create-xml-file-in-java-dom/

If you have any query regarding implementation please let me know.