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java Xpath 小例

Posted on 2007-08-03 15:46 G_G 阅读(4620) 评论(0)  编辑  收藏 所属分类: xml Related
java
package test;

import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.opensymphony.xwork2.ActionSupport;

public class TAction extends ActionSupport {
    private String xml1;
    public String getXml1() {
        return xml1;
    }
    public void setXml1(String xml1) {
        this.xml1 = xml1;
    }
    {
        
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory
                    .newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();

            // 创建
            Document document = builder.newDocument();
            Element root = document.createElement("root");
            document.appendChild(root);
            Element name = document.createElement("name");
            name.setAttribute("type", "ok");
            name.appendChild(document.createTextNode("liu!k>a^i!@$^*><{}yi"));
            root.appendChild(name);

            // 从数据库提取
            // String xmlstr= "<beans><name>liu</name><pass>123</pass></beans>";
            // builder.parse(new ByteArrayInputStream(str.getBytes()));

            // save to mysql
            StringWriter output = new StringWriter();
            TransformerFactory.newInstance().newTransformer().transform(
                    new DOMSource(document), new StreamResult(output));
            //System.out.println(output.toString());

            // 对内展现
            XPathFactory factoryXpah = XPathFactory.newInstance();
            XPath xpath = factoryXpah.newXPath();
            XPathExpression expr = xpath.compile("//name");
            System.out.println(expr.evaluate(document));
            expr = xpath.compile("//name/@type");
            //System.out.println(expr.evaluate(document));

            // 对jsp jstl xml
            // 参考 http://www.java2s.com/Code/Java/JSP/XML.htm

            this.xml1 = output.toString().replaceAll("<\\?.*\\?>", "");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        System.out.println(new TAction().getXml1());
    }
    

}


jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jstl/xml_rt" prefix="x"%>
<%@taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
    <c:import url="http://127.0.0.1:38080/ljw_svn2/test/data.do" var="webXml" />
    <x:parse xml="${webXml}" var="doc" />
     <x:out select="$doc//name"/><br />
</body>
</html>



<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jstl/xml_rt" prefix="x"%>
<%@taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>

    <c:set var="basepath" value="<%=request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/" %>"></c:set>
    <c:import url="${basepath}/infoPublishing.do?c=showXmlData&bid=63" var="webXml" />
    <x:parse xml="${webXml}" var="doc" />
     类型：<x:out select="$doc//typeFlag"/><br />
     qq：<x:out select="$doc//qq"/><br />
     msn：<x:out select="$doc//msn"/><br />


</body>
</html>