Apache的xstream解析XML工具类

更新日期20151012

package hrhx.dhm.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Component;

import com.thoughtworks.xstream.XStream;
/**
 * @version 20150902
 * @author duhongming
 *
 */
@Component
public class XmlUtil {
    private static XmlUtil instance = null;
    private XStream xs = null;
 
    private XmlUtil() {
        this.xs = new XStream();
    }
 
    /**
     * 初始化XmlUtil
     * @return
     */
    public static synchronized XmlUtil getInstance() {
        if (instance == null) {
            System.out.println("正在初始化XML处理对象.............");
            instance = new XmlUtil();
        }
 
        return instance;
    }
 
    /**
     * 将Object转化为XML字符串
     * @param obj
     * @return
     * @throws Exception
     */
    public String toXML(Object obj) throws Exception {
        if (obj == null)
            return null;
        return this.xs.toXML(obj);
    }
     
    /**
     * 对toXML方法重载，修改<节点名称>
     * @param obj
     * @param aliasMap
     * @return
     * @throws Exception
     */
    @SuppressWarnings("rawtypes")
    public String toXML(Object obj,Map aliasMap) throws Exception {
        if (obj == null)
            return null;
        for(Map.Entry entry:aliasMap.entrySet()){    
            this.xs.alias(entry.getKey(), entry.getValue()); 
        }   
        return this.xs.toXML(obj);
    }
 
    /**
     * 将Object转化为XML文件
     * @param obj
     * @param strFile
     * @throws Exception
     */
    public void toXMLFile(Object obj, String strFile) throws Exception {
        if (obj == null)
            return;
        if ((strFile == null) || (strFile.equals("")))
            throw new Exception("XML保存的文件名不能为空！");
        String str = strFile;
        str = str.replaceAll("//", "/");
 
        File f = new File(str.substring(  0, str.lastIndexOf("/")));
        if (!f.exists())
            f.mkdirs();
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(new File(str));
            this.xs.toXML(obj, fos);
            fos.close();
        } catch (Exception e) {
            if (fos != null)
                fos.close();
            e.printStackTrace();
            throw new Exception("将对象写到文件" + str + "失败！" + e.getMessage());
        }
    }
 
    /**
     * 将XML字符串转成Object
     * @param xml
     * @return
     * @throws Exception
     */
    public Object fromXML(String xml) throws Exception {
        if ((xml == null) || (xml.equals("")))
            return null;
 
        return this.xs.fromXML(xml);
    }
 
    /**
     * 将XML文件转成Object
     * @param strFile
     * @return
     * @throws Exception
     */
    public Object fromXMLFile(String strFile) throws Exception {
        if ((strFile == null) || (strFile.equals("")))
            return null;
        FileInputStream fis = null;
        Object obj = null;
        String str = strFile;
        str = str.replaceAll("//", "/");
        File f = new File(str);
        if (!f.exists())
            return null;
        try {
            fis = new FileInputStream(f);
            obj = this.xs.fromXML(fis).toString();
            fis.close();
        } catch (Exception e) {
            if (fis != null)
                fis.close();
            e.printStackTrace();
            throw new Exception("从文件" + str + "读取内容进行对象转换时失败！" + e.getMessage());
        }
        return obj;
    }
 
    public static void main(String[] args) throws Exception {
        String begin = "2002-10-21 23:12:34";
        begin = begin.substring(  5,   7) + "月" + begin.substring(  8,  10) + "日";
        List list = new ArrayList();
        list.add("duhongming");
        list.add("24");
        list.add(begin);
        String listXml = getInstance().toXML(list);
        System.out.println("将List数据转成XML："+listXml);
        System.out.println("将XML数据转成List："+getInstance().fromXML(listXml));
         
        String templateFileName = System.getProperty("user.dir")+"/target/demo.xml";
        getInstance().toXMLFile(list, templateFileName);
        System.out.println("将XML文件数据转成List："+getInstance().fromXMLFile(templateFileName));
         
        Map map = new HashMap();
        map.put("name", "duhongming");
        map.put("age", "24");
        map.put("birthday", "7月26日");
        String mapXml = getInstance().toXML(map);
        System.out.println("将Map数据转成XML："+mapXml);
        System.out.println(("将XML数据转成Map："+getInstance().fromXML(mapXml)));
    }
}

附Java平台自带的注解功能：

package com.hrhx.db;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlRootElement;

import com.sun.xml.internal.txw2.annotation.XmlElement;

@XmlRootElement
public class TestMenu {

	private String menuName;
	private String menuUrl;
	private String userName;
	private String timestamp;

	@XmlElement
	public String getMenuName() {
		return menuName;
	}

	public void setMenuName(String menuName) {
		this.menuName = menuName;
	}

	@XmlElement
	public String getMenuUrl() {
		return menuUrl;
	}

	public void setMenuUrl(String menuUrl) {
		this.menuUrl = menuUrl;
	}

	@XmlElement
	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}

	@XmlElement
	public String getTimestamp() {
		return timestamp;
	}

	public void setTimestamp(String timestamp) {
		this.timestamp = timestamp;
	}

	public static void main(String[] args) {
		JAXBContext jc;
		try {
			jc = JAXBContext.newInstance(TestMenu.class);
			Marshaller ms = jc.createMarshaller();
			TestMenu t = new TestMenu();
			t.setMenuName("baidu");
			t.setMenuUrl("http://www.baidu.com");
			t.setTimestamp("2015-10-1");
			t.setUserName("zhangsan");
			// System.out.println(t);
			ms.marshal(t, System.out);
		} catch (JAXBException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
}

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