java读取xml，将读到的数据存放到对象中，再按照一定条件写入xml，从而生成动态菜单

做eclipse插件开发，菜单项的配置是在plugin.xml中是写死的，现在想做成动态菜单的形式。中间写一个类，这个类可以读取一个xml配置文件，然后可以有一些方法把提取过的数据和plugin.xml联系起来，通过这个类来动态的配置eclipse的菜单。我的想法是把读到的xml文件的内容封装到java的对象中，返回值是一个集合类型，然后我就不知道怎么做了。

图片是展示效果:

下面是我们找的一些相关资源：
  [](http://dom4j.sourceforge.net/dom4j-1.6.1/guide.html "")

这是我自己写的demo：

package testforxybc;
public class UserInfo {

    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    private String password;
}


package testforxybc;

import java.beans.XMLDecoder;
import java.io.File;
import java.io.FileInputStream; 
import java.io.FileNotFoundException;  
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.List;

public class UserInfoController {

    public static void main(String args[])  
    {   
       List<UserInfo> objList = null;
       try {
        objList = UserInfoController.objectXMLDecoder("outxml.xml");
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 

       for (UserInfo userInfo : objList) {
           System.out.println(userInfo.getName());
           System.out.println(userInfo.getPassword());
       }
    }

    public static List<UserInfo> objectXMLDecoder(String objSource)    
     throws FileNotFoundException,IOException,Exception   
    {   
     List<UserInfo> objList = new ArrayList<UserInfo>();       
     File fin = new File(objSource);   
     FileInputStream fis = new FileInputStream(fin);   
     XMLDecoder decoder = new XMLDecoder(fis);   
     Object obj = null;   
     try   
     {   
      while( (obj = decoder.readObject()) != null)   
      {   
       objList.add((UserInfo) obj);
      }   
     }   
     catch (Exception e)   
     {   
      // TODO Auto-generated catch block       
     }   
     fis.close();   
     decoder.close();        
     return objList;   
    }   
}


<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>

   <extension
         point="org.eclipse.ui.commands">
      <category
            name="Inoherb Category"
            id="com.uds.inoherb.commands.category">
      </category>
      <command
            name="法规标准库"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.regulatoryStandards">
      </command>

      <command
            name="产品标准"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.productStandard">
      </command>
      <command
            name="禁限用清单"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.prohibitedList">
      </command>
      <command
            name="全成分"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.fullComposition">
      </command>

      <command
            name="原料库"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.rawMaterial">
      </command>
      <command
            name="油脂类"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.fadAndOil">
      </command>
      <command
            name="乳化剂类"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.emulsifier">
      </command>
      <command
            name="香精类"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.parfum">
      </command>
      <command
            name="活性物类"
            categoryId="com.uds.inoherb.commands.category"
            id="com.uds.inoherb.commands.actives">
      </command>
   </extension>

   <extension
         point="org.eclipse.ui.handlers">
      <handler
            commandId="com.uds.inoherb.commands.regulatoryStandards"
            class="com.uds.inoherb.handlers.SampleHandler">
      </handler>
      <handler
            commandId="com.uds.inoherb.commands.rawMaterial"
            class="com.uds.inoherb.handlers.SampleHandler">
      </handler>
      <handler
            commandId="com.uds.inoherb.commands.productStandard"
            class="com.uds.inoherb.handlers.SampleHandler">
      </handler>
      <handler
            commandId="com.uds.inoherb.commands.fadAndOil"
            class="com.uds.inoherb.handlers.SampleHandler">
      </handler>
   </extension>

   <extension
         point="org.eclipse.ui.bindings">
      <key
            commandId="com.uds.inoherb.commands.sampleCommand"
            contextId="org.eclipse.ui.contexts.window"
            sequence="M1+6"
            schemeId="org.eclipse.ui.defaultAcceleratorConfiguration">
      </key>
   </extension>

   <extension
         point="org.eclipse.ui.menus">
      <menuContribution
            locationURI="menu:org.eclipse.ui.main.menu?after=additions">
         <menu
               label="企业电子数据库"
               id="com.uds.inoherb.menus.sampleMenu">

               <menu 
               label="法规标准库"
               id="com.uds.inoherb.menus.sampleMenu2">
               <command
                  commandId="com.uds.inoherb.commands.productStandard"
                  id="com.uds.inoherb.menus.productStandard">
               </command>
               <command
                  commandId="com.uds.inoherb.commands.prohibitedList"
                  id="com.uds.inoherb.menus.prohibitedList">
               </command>
               <command
                  commandId="com.uds.inoherb.commands.fullComposition"
                  id="com.uds.inoherb.menus.fullComposition">
               </command>
               </menu>

               <menu 
               label="原料库"
               id="com.uds.inoherb.menus.sampleMenu3"> 
               <command
                  commandId="com.uds.inoherb.commands.fadAndOil"
                  id="com.uds.inoherb.menus.fadAndOil">
               </command>
               <command
                  commandId="com.uds.inoherb.commands.emulsifier"
                  id="com.uds.inoherb.menus.emulsifier">
               </command>
               <command
                  commandId="com.uds.inoherb.commands.parfum"
                  id="com.uds.inoherb.menus.parfum">
               </command>
               <command
                  commandId="com.uds.inoherb.commands.actives"
                  id="com.uds.inoherb.menus.actives">
               </command>
               </menu>
         </menu>
      </menuContribution>
   </extension>
</plugin>

http://sheikharaf.me/gsoc16/dynamic-menu-with-click-listener.html
http://stackoverflow.com/questions/14783424/how-to-make-a-dynamic-context-menu-for-an-eclipse-plug-in

XML小试

XML应用

这上面的两个小例子应该对你这个需求很有帮助，代码注释也非常清晰，希望对你有所帮助 :-)

xml文件读取

 import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import excel.Student;

public class Js {
    public static void main(String[] args) {
        // 读取创建file对象
        File file = new File("F://data.xml");
        SAXReader reader = new SAXReader();
        Document xmlDoc = null;
        try {
             //创建Document对象
            xmlDoc = reader.read(file);
        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Element root = xmlDoc.getRootElement();
        List<Element> data = root.elements();
        List<Student> list = new ArrayList<Student>();
        for (int i = 0; i < data.size(); i++) {
            Student student = new Student(data.get(i).elementText("name"),
                    Integer.parseInt(data.get(i).elementText("id")));
            list.add(student);
        }
        System.out.println(list);
    }
}

xml文件写入

 import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;

public class CreateXML {
public static void main(String[] args) throws Exception {
  //实例化解析器
   DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
   DocumentBuilder builder = factory.newDocumentBuilder();
    //创建Document对象
   Document doc = builder.newDocument();

   //创建XML文件所需的各种对象并序列化
   Element data = doc.createElement("data");
   Element student = doc.createElement("student");
   Element name = doc.createElement("name");
   Element id = doc.createElement("id");
   Text nameText = doc.createTextNode("张三");
   Text idText    = doc.createTextNode("123456");
   doc.appendChild(data);
   data.appendChild(student);
   student.appendChild(name);
   student.appendChild(id); 
   name.appendChild(nameText);
   id.appendChild(idText);
   student.setAttribute("isbn", "00001");
   doc2XmlFile(doc,"F://test.xml");

}

public static boolean doc2XmlFile(Document document, String filename) {
   boolean flag = true;
   try {
    TransformerFactory tFactory = TransformerFactory.newInstance();
    Transformer transformer = tFactory.newTransformer();
    transformer.setOutputProperty(OutputKeys.ENCODING, "UFT-8");
    DOMSource source = new DOMSource(document);
    StreamResult result = new StreamResult(new File(filename));
    transformer.transform(source, result);
   } catch (Exception ex) {
    flag = false;
    ex.printStackTrace();
   }
   return flag;
}
}

data.dtd

 <?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT data (student+)>
<!ELEMENT student (name,id)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT id (#PCDATA)>
<!ATTLIST student isbn ID #REQUIRED aaa CDATA #IMPLIED>

data.xml

 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE note SYSTEM "data.dtd">

<data>
    <student isbn="A001">
        <name>张三</name>
        <id>1234567</id>
    </student>
</data>