简略的解析xml

简单的解析xml

1、实现将文件读取。

2、然后使用xpath进行解析。

import java.io.BufferedReader;import java.io.FileInputStream;import java.io.InputStream;import java.io.InputStreamReader;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.DocumentHelper;import org.dom4j.Node;import org.dom4j.XPath;public class ParseXML {/** * 根据xpath表达式解析 xml * @param document * @param xpathExp * @return */    public static String xpath(String xml, String xpathExp) {Document document=null;System.out.println(xml);try {document = DocumentHelper.parseText(xml);} catch (DocumentException e) {e.printStackTrace();}        XPath xpath = document.createXPath(xpathExp);        Node node = xpath.selectSingleNode(document);        if (node != null) {        //取值             String val = node.getStringValue();          //  System.out.println(node.asXML());            return node.asXML();        }        return null;    }        /**     * 读取文件     * @param fileName     * @return     */    public static String readFile(String fileName) {    StringBuilder sb = new StringBuilder();    InputStream f=null;    BufferedReader br=null;     try {f = new FileInputStream(fileName);br = new BufferedReader(new InputStreamReader(f));String line="";while ((line = br.readLine()) != null) {sb.append(line);}if(sb.length()>0) {return sb.toString();}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally {try {if(br!=null)br.close();if(br!=null)f.close();} catch(Exception e) {e.printStackTrace();}}return null;    }        public static void main(String[] args) {    //将String str = readFile("signpay.xml");//获取signpay.xml中head的值System.out.println(xpath(str,"/*/head"));}}