反射+jdom+xml例子，经过一番折腾，总算知道反射是啥意思了，真的很感谢帮助我的人，不知道说啥好了，就是感动，我把我做的东西和大家分
建一个文件夹D:\some\directory
Xml类
package com.cyberobject.study;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

public class Xml {

/**
* 向指定的xml文件写数据
* @param FileName 要用到的cell文件模板名
* @param dto 传输数据对象
* @throws ClassNotFoundException
* @throws IllegalAccessException
* @throws IllegalArgumentException
* @throws InstantiationException
*/
public void writeXmlFile(DataTransaction dto) throws ClassNotFoundException, IllegalArgumentException, IllegalAccessException, InstantiationException{

Element rootElement = new Element( "WorkBook ");
Document myDocument = new Document(rootElement);

List dtoObjects = dto.getDtoObjects();

for(int i = 0 ; i < dtoObjects.size() ; i++){

Element cellFileElement = new Element( "CellFile ");
rootElement.addContent(cellFileElement);

DtoObject dtoObject = (DtoObject)dtoObjects.get(i);

cellFileElement.setAttribute( "name ",dtoObject.getCellFileName()+ ".cell ");

List objects = dtoObject.getObjects();

for(int j = 0 ;j < objects.size(); j++ ){
Object object = dtoObject.getObjects().get(j);

Element objElement = new Element( "Object ");
Field fieldList[] = object.getClass().getFields();

for(int k = 0 ; k < fieldList.length ; k++){
String fieldName = fieldList[k].getName().toString();
String fieldValue = fieldList[k].get(object).toString();
System.out.print(fieldName+ ": "+fieldValue);
objElement.setAttribute(fieldName,fieldValue.toString());
}
cellFileElement.addContent(objElement);
}

XMLOutputter output = new XMLOutputter(Format.getPrettyFormat());

try{
File mydir=new File( "d:/some/directory/ "+dto.getXmlFileName()+ ".xml ");
if(!mydir.exists()){
this.createFile( "d:/some/directory/ ",dto.getXmlFileName());
}else{
this.deleteFile( "d:/some/directory/ "+dto.getXmlFileName()+ ".xml ");

FileWriter fileWriter = new FileWriter( "d:/some/directory/ "+dto.getXmlFileName()+ ".xml ");
output.output(myDocument,fileWriter);
fileWriter.close();
}
}catch(IOException e){
e.printStackTrace();
}
}
}

/**
* 删除文件

* @param path 文件路径
*/
public void deleteFile(String path){
File f=new File(path);
try{
f.delete();
}catch(Exception e){
e.printStackTrace();
}
}

/**
* 创建文件
* @param 文件路径
* @param 文件名
* @return
* @throws IOException
*/
public boolean createFile(String _path,String _fileName)throws IOException {
boolean success = false;
String fileName = _fileName;
String filePath = _path;

try {
File file = new File(filePath);
if (!file.isDirectory()){
file.mkdirs();
}

File f = new File(filePath + File.separator + fileName + ".xml ");
success = f.createNewFile();
} catch (IOException e){
e.printStackTrace();
}
return success;
}

public static void main(String args[]) throws ClassNotFoundException, IllegalArgumentException, IllegalAccessException, InstantiationException{
Employee e1 = new Employee();
e1.setId( "2 ");
e1.setName( "a ");

Factory f1 = new Factory();
f1.setFactoryName( "b ");
f1.setFactoryId( "2 ");

Book b1 = new Book();
b1.setAuthor( "dudu ");
b1.setName( "titi ");

DataTransaction dto = new DataTransaction();
dto.setXmlFileName( "dd ");

DtoObject dtoObject1 = new DtoObject();
DtoObject dtoObject2 = new DtoObject();
DtoObject dtoObject3 = new DtoObject();

dtoObject1.getObjects().add(e1);
dtoObject2.getObjects().add(f1);
dtoObject3.getObjects().add(b1);

dtoObject1.setCellFileName( "aa ");
dtoObject2.setCellFileName( "bb ");
dtoObject3.setCellFileName( "cc ");

//dtoObject1.setClassName( "com.cyberobject.study.Employee ");
//dtoObject2.setClassName( "com.cyberobject.study.Factory ");

dto.getDtoObjects().add(dtoObject1);
dto.getDtoObjects().add(dtoObject2);
dto.getDtoObjects().add(dtoObject3);

Xml xml = new Xml();
xml.writeXmlFile(dto);

}
}


Employee类
package com.cyberobject.study;

public class Employee {

public String name = null;

public String id = null;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return name;
}

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

Factory类
package com.cyberobject.study;

public class Factory {

public String factoryName = null;

public String factoryId = null;

public String getFactoryName() {
return factoryName;
}

public void setFactoryName(String factoryName) {
this.factoryName = factoryName;
}

public String getFactoryId() {
return factoryId;
}

public void setFactoryId(String factoryId) {
this.factoryId = factoryId;
}
}

Book类
package com.cyberobject.study;

public class Book {

public String name = null;

public String author = null;

public String getAuthor() {
return author;
}

public void setAuthor(String author) {
this.author = author;
}

public String getName() {
return name;
}

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



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