关于XML字符串和XML Document之间的转换

在web项目中，XML作为一种重要的数据存储和传输介质，被广泛使用。XML文件，XML字符串和XML Document对象是XML存在的三种形式，XML文件无需多言，和普通的文本并无二致；倒是在做一般的XML数据交换过程中，经常要使用XML字符串和XML Document对象，因此在这两种形式之间进行转化成为了使用XML的必备技术。在所有操控XML的技术中，都提供了这两种形式XML之间的转换方法。

  下面我就各种XML技术对此问题的解决方法做个总结，和大家分享，也方便自己今后查阅。

一，使用JDOM(这是我最常使用的一种技术)

  1.字符串转Document对象

String xmlStr = ".....";
StringReader sr = new StringReader(xmlStr);
InputSource is = new InputSource(sr);
Document doc = ( new SAXBuilder()).build(is);

  2.Document对象转字符串

Format format = Format.getPrettyFormat();
format.setEncoding( "gb2312"); //设置xml文件的字符为gb2312，解决中文问题
XMLOutputter xmlout = new XMLOutputter(format);
ByteArrayOutputStream bo = new ByteArrayOutputStream();
xmlout.output(doc,bo);
String xmlStr = bo.toString();

 注：Document为org.jdom.Document

二，使用最原始的javax.xml.parsers，标准的jdk api

  1.字符串转Document对象

String xmlStr = "......";
StringReader sr = new StringReader(xmlStr);
InputSource is = new InputSource(sr);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
Document doc = builder.parse(is);

  2.Document对象转字符串

TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = tf.newTransformer();
t.setOutputProperty( "encoding", "GB23121"); //解决中文问题，试过用GBK不行
ByteArrayOutputStream bos = new ByteArrayOutputStream();
t.transform( new DOMSource(doc), new StreamResult(bos));
String xmlStr = bos.toString();

 注：Document为org.w3c.dom.Document

三，使用dom4j(这是最简单的方法)

  1.字符串转Document对象

String xmlStr = "......";
Document document = DocumentHelper.parseText(xmlStr);

  2.Document对象转字符串

Document document = ...;
String text = document.asXML();

 注：Document为org.dom4j.Document

四，在JavaScript中的处理

 1.字符串转Document对象

var xmlStr = ".....";
var xmlDoc = new ActiveXObject( "Microsoft.XMLDOM");
xmlDoc.async= false;
xmlDoc.loadXML(xmlStr);
//可以处理这个xmlDoc了
var name = xmlDoc.selectSingleNode( "/person/name");
alert(name.text);

  2.Document对象转字符串

var xmlDoc = ......;
var xmlStr = xmlDoc.xml

 注：Document为javaScript版的XMLDOM

本文出自 “夜狼” 博客，请务必保留此出处http://yangfei520.blog.51cto.com/1041581/382977

 

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(), z, 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

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(), z, 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

• xpp3_min-1.1.4c.jar (24.4 KB)
• 下载次数: 51

• xstream-1.3.jar (401.5 KB)
• 下载次数: 52