dom4j將xml轉換成物件

package test;

import java.lang.reflect.Field;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
  
import org.dom4j.Document;  
import org.dom4j.DocumentHelper;  
import org.dom4j.Element; 
import org.dom4j.tree.DefaultAttribute;

public class XmlUtil {
    
    /** 
     * xml字串轉換成bean物件 
     *  
     * @param xmlStr xml字串 
     * @param clazzMap 待轉換的class包括物件屬性的class 
     * @return 轉換後的物件 
     */  
    public static Object xmlStrToBean(String xmlStr,Map<String,Class>  clazzMap) {  
        Object obj = null;  
        try {  
            // 將xml格式的資料轉換成Map物件  

        	   Map<String, Object> map = new HashMap<String, Object>();  
               //將xml格式的字串轉換成Document物件  
               Document doc = DocumentHelper.parseText(xmlStr);  
               //獲取根節點  
               Element root = doc.getRootElement();  
              
              //將map物件的資料轉換成Bean物件  
               obj = mapToBean(root, clazzMap);  
        } catch(Exception e) {  
            e.printStackTrace();  
        }  
        return obj;  
    }  
      

   
    
      
    /** 
     * 將Map物件通過反射機制轉換成Bean物件 
     *  
     * @param clazzMap 待轉換的class包括物件屬性的class 
     * @return 轉換後的Bean物件 
     * @throws Exception 異常 
     */  
    public static Object mapToBean( Element root,Map<String,Class> clazzMap) throws Exception { 
    	 //獲取根節點下的所有元素  
        List children = root.elements();
        List<DefaultAttribute> attrs= root.attributes();
      
    	 Map<String, Object> map = new HashMap<String, Object>(); 
    	   if(children != null && children.size() > 0) {  
               for(int i = 0; i < children.size(); i++) {              	
                  Element child = (Element)children.get(i);            
                  if(!child.isTextOnly()){               	  
                	 Object ob= mapToBean(child,clazzMap);
               	     map.put(child.getName(),ob);
                  }else{
               	   map.put(child.getName(), child.getTextTrim());  
                  }
                  
               }  
           }    	   
    	   for(DefaultAttribute att:attrs){
    		   map.put(att.getName(),att.getText());  
    	   }
    	   
    	Class clazz=clazzMap.get(root.getName());   
        Object obj = clazz.newInstance();  
        if(map != null && map.size() > 0) {  
            for(Map.Entry<String, Object> entry : map.entrySet()) {  
                String propertyName = entry.getKey();  
                Object value = entry.getValue();  
                String setMethodName = "set"  
                        + propertyName.substring(0, 1).toUpperCase()  
                        + propertyName.substring(1);  
                Field field = getClassField(clazz, propertyName);  
                Class fieldTypeClass = field.getType();  
                value = convertValType(value, fieldTypeClass);  
                clazz.getMethod(setMethodName, field.getType()).invoke(obj, value);  
            }  
        }  
        return obj;  
    }  
      
    /** 
     * 將Object型別的值，轉換成bean物件屬性裡對應的型別值 
     *  
     * @param value Object物件值 
     * @param fieldTypeClass 屬性的型別 
     * @return 轉換後的值 
     */  
    private static Object convertValType(Object value, Class fieldTypeClass) {  
        Object retVal = null;  
        if(Long.class.getName().equals(fieldTypeClass.getName())  
                || long.class.getName().equals(fieldTypeClass.getName())) {  
            retVal = Long.parseLong(value.toString());  
        } else if(Integer.class.getName().equals(fieldTypeClass.getName())  
                || int.class.getName().equals(fieldTypeClass.getName())) {  
            retVal = Integer.parseInt(value.toString());  
        } else if(Float.class.getName().equals(fieldTypeClass.getName())  
                || float.class.getName().equals(fieldTypeClass.getName())) {  
            retVal = Float.parseFloat(value.toString());  
        } else if(Double.class.getName().equals(fieldTypeClass.getName())  
                || double.class.getName().equals(fieldTypeClass.getName())) {  
            retVal = Double.parseDouble(value.toString());  
        } else {  
            retVal = value;  
        }  
        return retVal;  
    }  
  
    /** 
     * 獲取指定欄位名稱查詢在class中的對應的Field物件(包括查詢父類) 
     *  
     * @param clazz 指定的class 
     * @param fieldName 欄位名稱 
     * @return Field物件 
     */  
    private static Field getClassField(Class clazz, String fieldName) {  
        if( Object.class.getName().equals(clazz.getName())) {  
            return null;  
        }  
        Field []declaredFields = clazz.getDeclaredFields();  
        for (Field field : declaredFields) {  
            if (field.getName().equals(fieldName)) {  
                return field;  
            }  
        }  
  
        Class superClass = clazz.getSuperclass();  
        if(superClass != null) {// 簡單的遞迴一下  
            return getClassField(superClass, fieldName);  
        }  
        return null;  
    }   
    
    public static String getXML(){
    	StringBuffer sb=new StringBuffer();
    	sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
    	sb.append("<note name=\"xian\">");
    	sb.append("<to>George</to>");
    	sb.append("<Student>");
    	sb.append("<name>xian</name>");
    	sb.append("<classRoom>");
    	sb.append("<name>Ap111111</name>");
    	sb.append("</classRoom>");
    	sb.append("<age>13</age>");
    	sb.append("</Student>");
    	sb.append("<from>John</from>");
    	sb.append("<heading>Reminder</heading>");
    	sb.append("<Body>Don't forget the meeting!</Body>");
    	sb.append("</note>");
    	return sb.toString();
    }
    
    public static void main(String[] args){
      Map<String ,Class> mapClass=new HashMap<String,Class>();
      mapClass.put("note", Note.class);
      mapClass.put("Student", Student.class);
      mapClass.put("classRoom", ClassRoom.class);
      Note note=(Note)xmlStrToBean(getXML(),mapClass);
      System.out.println(note.getName()+"--"+note.getTo()+"--"/*+note.getStudent().getAge()+note.getStudent().getClassRoom().getName()*/);
    }

}
 

package test;


public class Note {
public String to;
public String from;
public String heading;
public String Body;
public String name;
public Student Student;
public String getTo() {
return to;
}
public void setTo(String to) {
this.to = to;
}
public String getFrom() {
return from;
}
public void setFrom(String from) {
this.from = from;
}
public String getHeading() {
return heading;
}
public void setHeading(String heading) {
this.heading = heading;
}

public String getBody() {
return Body;
}
public void setBody(String body) {
Body = body;
}



public Student getStudent() {
return Student;
}
public void setStudent(Student student) {
Student = student;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}






}

package test;


public class Student {
public String name;
public String age;
public ClassRoom classRoom;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public ClassRoom getClassRoom() {
return classRoom;
}
public void setClassRoom(ClassRoom classRoom) {
this.classRoom = classRoom;
}





}

package test;


public class ClassRoom {
public String name;



public String getName() {
return name;
}


public void setName(String name) {
this.name = name;
}



}