w3c document中节点名字的简单替换

简单的替换操作，基本不需引jar包。

首先写一个工具类。

package xuzs.servlet;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public final class DomUtils {

    public static Document file2Dom(String fileName) {
        String strXml = file2Str(fileName);
        Document doc = str2Dom(strXml);
        return doc;
    }

    public static String dom2Str(Document doc) {
        ByteArrayOutputStream bos = null;
        try {
            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer t = tf.newTransformer();
            t.setOutputProperty("encoding", "utf-8");
            bos = new ByteArrayOutputStream();
            t.transform(new DOMSource(doc), new StreamResult(bos));
        } catch (TransformerException e) {
            e.printStackTrace();
        }
        return bos.toString();
    }

    public static Document str2Dom(String xmlStr) {
        StringReader sr = new StringReader(xmlStr); 
        InputSource is = new InputSource(sr); 
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 
        DocumentBuilder builder;
        Document doc = null;
        try {
            builder = factory.newDocumentBuilder();
            doc = builder.parse(is);
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } 
        return doc; 
    }

    public static String file2Str(String fileName) {
        StringBuilder sb = new StringBuilder();
        BufferedReader br = null;
        try {
            FileReader fr = new FileReader(fileName);
            br = new BufferedReader(fr);
            String tmp = "";
            while ((tmp = br.readLine()) != null) {
                sb.append(tmp);
                sb.append("\n");
            }
            br.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sb.toString();
    }
}

简单的测试类。

package xuzs.servlet;

import org.apache.soap.SOAPException;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

public class DomTest {

    private static final String DEFAULT_DATA_FILENAME = "D:/AuthzTestQuery.xml";

    public static void main(String[] args) throws SOAPException {
        Document doc = DomUtils.file2Dom(DEFAULT_DATA_FILENAME);
        System.out.println(DomUtils.dom2Str(doc));
        Node node = doc.getElementsByTagName("samlp:AuthzDecisionQuery").item(0);
        // 获取指定属性
        String namespaceURI = node.getAttributes().getNamedItem("xmlns:samlp").getNodeValue();
        System.out.println(namespaceURI);
        doc.renameNode(node, namespaceURI, "samlp:activateRequest");
        System.out.println(DomUtils.dom2Str(doc));
    }

}

被处理的文件。

<?xml version="1.0" encoding="UTF-8" ?>

<samlp:AuthzDecisionQuery
  xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
  ID="AuthzQuery12345789"
  IssueInstant="2009-08-14T15:22:03.250Z"
  Resource="http://mycom.com/Repository/Private"
  Version="2.0">
  <saml:Issuer
    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
  >http://somecom.com/SomeJavaRelyingParty</saml:Issuer>
  <saml:Subject
    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">
    <saml:NameID>harold_dt</saml:NameID>
  </saml:Subject>
  <saml:Action
    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
    Namespace="urn:oasis:names:tc:SAML:1.0:action:rwedc">read</saml:Action>
</samlp:AuthzDecisionQuery>