简单XML读写工具类

更多请参考：自定义简单XML的读与存，便捷工具类

 

import java.io.File;
import java.io.FileWriter;
import java.io.StringWriter;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

/**
 * XML工具类
 * 
 */
public class XMLUtils {

	/**
	 * 返回格式化的XML字段串
	 * 
	 * @param document
	 *            要格式化的文档
	 * @param encoding
	 *            使用的编码,如果为null刚使用默认编码(gb2312)
	 * @return 格式化的XML字段串
	 */
	public static String toXMLString(Document document, String encoding) {
		if (encoding == null) {
			encoding = "gb2312";
		}
		StringWriter writer = new StringWriter();
		OutputFormat format = OutputFormat.createPrettyPrint();
		format.setEncoding("gb2312");
		XMLWriter xmlwriter = new XMLWriter(writer, format);
		try {
			xmlwriter.write(document);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return writer.toString();
	}

	/**
	 * 返回格式化的XML字段串
	 * 
	 * @param element
	 *            要格式化的节点元素
	 * @param encoding
	 *            使用的编码,如果为null刚使用默认编码(gb2312)
	 * @return 格式化的XML字段串
	 */
	public static String toXMLString(Element element, String encoding) {
		if (encoding == null) {
			encoding = "gb2312";
		}
		StringWriter writer = new StringWriter();
		OutputFormat format = OutputFormat.createPrettyPrint();
		format.setEncoding(encoding);
		XMLWriter xmlwriter = new XMLWriter(writer, format);
		try {
			xmlwriter.write(element);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return writer.toString();
	}

	/**
	 * 格式化文档并输出到文件
	 * 
	 * @param document
	 *            要输出的文档
	 * @param filename
	 *            XML文件名
	 * @param encoding
	 *            使用的编码,如果为null刚使用默认编码(gb2312)
	 * @return true or false
	 */
	public static boolean toXMLFile(Document document, String filename,
			String encoding) {
		if (encoding == null) {
			encoding = "gb2312";
		}
		boolean returnValue = false;
		try {
			XMLWriter output = null;
			/** 格式化输出,类型IE浏览一样 */
			OutputFormat format = OutputFormat.createPrettyPrint();
			/** 指定XML字符集编码 */
			format.setEncoding(encoding);
			output = new XMLWriter(new FileWriter(new File(filename)), format);
			output.write(document);
			output.close();
			/** 执行成功,需返回1 */
			returnValue = true;
		} catch (Exception ex) {
			ex.printStackTrace();
			returnValue = false;
		}
		return returnValue;
	}

	/**
	 * 格式化XML文件并保存
	 * 
	 * @param srcFileName
	 *            源XML文件
	 * @param desFileName
	 *            格式化后的XML文件,如果为null,则使用srcFileName
	 * @param encoding
	 *            使用的编码,如果为null刚使用默认编码(gb2312)
	 * @return true or false
	 */
	public static boolean toXMLFile(String srcFileName, String desFileName,
			String encoding) {
		if (encoding == null) {
			encoding = "gb2312";
		}
		if (desFileName == null) {
			desFileName = srcFileName;
		}
		boolean returnValue = false;
		try {
			SAXReader saxReader = new SAXReader();
			Document document = saxReader.read(new File(srcFileName));
			XMLWriter output = null;
			/** 格式化输出,类型IE浏览一样 */
			OutputFormat format = OutputFormat.createPrettyPrint();
			/** 指定XML字符集编码 */
			format.setEncoding(encoding);
			output = new XMLWriter(new FileWriter(new File(desFileName)),
					format);
			output.write(document);
			output.close();
			/** 执行成功,需返回1 */
			returnValue = true;
		} catch (Exception ex) {
			ex.printStackTrace();
			returnValue = false;
		}
		return returnValue;
	}

	/**
	 * 从读取XML文件
	 * 
	 * @param fileName
	 * @return Document对象
	 */
	public static Document read(String fileName) {
		SAXReader reader = new SAXReader();
		Document document = null;
		try {
			document = reader.read(new File(fileName));
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return document;
	}

	/**
	 * 从XML字符串转换到document
	 * 
	 * @param xmlStr
	 *            XML字符串
	 * @return Document
	 */
	public static Document parseText(String xmlStr) {
		Document document = null;
		try {
			document = DocumentHelper.parseText(xmlStr);
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return document;
	}
}