关于XML字符串和XML Document之间的转换

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xml格式字符串与java对象互转

import java.lang.reflect.Field;
import java.util.List;

import com.thoughtworks.xstream.XStream;

public class XmlUtil {
	// 所有需要注册的类的配置,public static final String CONFIGFILE = new GetClassPath()
			.getMyConfigPath()
			+ "/xml.prop";
	
	private static XStream xs = null;
	
	private static XmlUtil xmlUtil = null;

	private XmlUtil() {
		try {
			// 获取所有需要与处理的java完整名
			List list = FileUtil.readFile(CONFIGFILE);
			
			//初始化xs
			xs = alias(list);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 获得实例
	 * @return
	 */
	public static synchronized XmlUtil getInstance() {
		
		if(null == xmlUtil){
			xmlUtil = new XmlUtil();
		}
		
		return xmlUtil;
	}

	/**
	 * 根据类名做反射
	 * 
	 * @param list
	 *            类完整名
	 * @return
	 * @throws ClassNotFoundException
	 */
	public XStream alias(List list) throws ClassNotFoundException {
		XStream xs = new XStream();
		for (int i = 0; i < list.size(); i++) {
			Object obj;
			try {
				obj = Class.forName((String) list.get(i)).newInstance();
				Class zz = obj.getClass();
				aliasAtt(xs,zz);
			} catch (InstantiationException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			}
		}
		return xs;
	}

	/**
	 * 对类进行xml解析配置
	 * 
	 * @param xs
	 * @param z
	 *            class对象
	 */
	public void aliasAtt(XStream xs,Class z) {
		if (null == z) {
			return;
		}

		// 类名注册
		xs.alias(z.getSimpleName(),z);
		Field[] field = z.getDeclaredFields();
		// 类中成员变量注册,继承的不注册
		for (int i = 0; i < field.length; i++) {
			xs.aliasField(field[i].getName(),field[i].getName());
		}
	}
	
	/**
	 * xml 格式字符串转换为对象
	 * @param str
	 * @return
	 */
	public Object xmlToObject(String str) {
		return xs.fromXML(str);
	}
	
	/**
	 * 对象转换为xml格式字符串
	 * @param obj
	 * @return
	 */
	public String objToXml(Object obj) {
		return xs.toXML(obj);
	}
}

FileUtil.readFile()方法如下

/**
	 * 读取文件
	 * 
	 * @param filePath
	 *            文件完整名
	 * @return 文件内容
	 * @throws IOException
	 */
	public static List readFile(String filePath) {

		List list = new ArrayList();

		FileInputStream fs = null;
		InputStreamReader isr = null;
		BufferedReader br = null;

		try {
			fs = new FileInputStream(filePath);

			isr = new InputStreamReader(fs);

			br = new BufferedReader(isr);

			String data = "";
			while ((data = br.readLine()) != null) {
				list.add(data.trim());
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (br != null)
					br.close();
				if (isr != null)
					isr.close();

				if (fs != null)
					fs.close();

			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return list;
	}

Test
         Printdata pd = new Printdata();
	pd.setPrintFileList(printFileList);
	pd.setAuto("1");
	pd.setBillReceiver("billReceiver");
	pd.setCustId("cust_id");
	pd.setYear("2011");
	pd.setMonth("11");
	List list = FileUtil.readFile(XmlUtil.CONFIGFILE);
	XmlUtil xmlUtil = XmlUtil.getInstance();
	String xml = xmlUtil.objToXml(pd);//对象至xml
	System.out.println(xml);
         Printdata obj = (Printdata)xmlUtil.xmlToObject(xml);//xml至对象

需要的jar包见附件

（编辑：李大同）

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