1.首先要写工具类，处理读取和写入xml文件使用的工具。XMLUtil.java

import java.io.FileInputStream;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.StringReader;

import java.io.StringWriter;

import javax.xml.bind.JAXBContext;

import javax.xml.bind.JAXBException;

import javax.xml.bind.Marshaller;

import javax.xml.bind.Unmarshaller;

/**

* 封装了XML转换成object，object转换成XML的代码

*

* @author mscall

*

*/

public class XMLUtil {

/**

* 将对象直接转换成String类型的 XML输出

*

* @param obj

* @return

*/

public static String convertToXml(Object obj) {

// 创建输出流

StringWriter sw = new StringWriter();

try {

// 利用jdk中自带的转换类实现

JAXBContext context = JAXBContext.newInstance(obj.getClass());

Marshaller marshaller = context.createMarshaller();

// 格式化xml输出的格式

marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,

Boolean.TRUE);

marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");

// 将对象转换成输出流形式的xml

marshaller.marshal(obj, sw);

} catch (JAXBException e) {

e.printStackTrace();

}

return sw.toString();

}

/**

* 将对象根据路径写入指定的xml文件里

*

* @param obj

* @param path

* @return

*/

public static void convertToXml(Object obj, String path) {

try {

// 利用jdk中自带的转换类实现

JAXBContext context = JAXBContext.newInstance(obj.getClass());

Marshaller marshaller = context.createMarshaller();

// 格式化xml输出的格式

marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,

Boolean.TRUE);

marshaller.setProperty(Marshaller.JAXB_ENCODING, "GBK");

// 将对象转换成输出流形式的xml

// 创建输出流

FileWriter fw = null;

try {

fw = new FileWriter(path);

} catch (IOException e) {

e.printStackTrace();

}

marshaller.marshal(obj, fw);

} catch (JAXBException e) {

e.printStackTrace();

}

}

/**

* 将String类型的xml转换成对象

*/

public static Object convertXmlStrToObject(Class> clazz, String xmlStr) {

Object xmlObject = null;

try {

JAXBContext context = JAXBContext.newInstance(clazz);

// 进行将Xml转成对象的核心接口

Unmarshaller unmarshal = context.createUnmarshaller();

StringReader sr = new StringReader(xmlStr);

xmlObject = unmarshal.unmarshal(sr);

} catch (Exception e) {

e.printStackTrace();

}

return xmlObject;

}

/**

* 将file类型的xml转换成对象

*/

public static Object convertXmlFileToObject(Class> clazz, String xmlPath) {

Object xmlObject = null;

try {

JAXBContext context = JAXBContext.newInstance(clazz);

Unmarshaller unmarshaller = context.createUnmarshaller();

InputStreamReader isr=new InputStreamReader(new FileInputStream(xmlPath),"GBK");

xmlObject = unmarshaller.unmarshal(isr);

} catch (Exception e) {

e.printStackTrace();

}

return xmlObject;

}

}

2.测试写入

public static void Tea(){

Tea tea = new Tea();

tea.set_unit(1);

tea.set_e("e1");

try {

XMLUtil.convertToXml(tea, "C:/XML/tea.xml");

} catch (Exception e1) {

e1.printStackTrace();

}

}

3.测试读

Tea tea = (Tea) XMLUtil.convertXmlFileToObject(Tea.class, "C:/XML/tea.xml");