xmltools.java

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package com.vere.util;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.w3c.dom.Element;
import org.w3c.dom.DocumentType;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Comment;
import org.w3c.dom.CDATASection;

import java.io.InputStream;

public class XMLTools {

  private XMLTools() {
  }

  public static Document inputStreamToDocument(InputStream is) {
    if (is == null)
      throw new IllegalArgumentException("XMLTools类的inputStreamToDocument方法：参数为null。");
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    Document doc = null;
    try {
       DocumentBuilder db = dbf.newDocumentBuilder();
       doc = db.parse(is);
    }catch(ParserConfigurationException e){
      throw new IllegalArgumentException("XMLTools类的inputStreamToDocument方法：" + e.toString());
    }catch(Exception e){
      throw new IllegalArgumentException("XMLTools类的inputStreamToDocument方法：" + e.toString());
    }
    return doc;
  }

  public static Document stringToDocument(String s) {
    //InputStream is = StringTools.stringToInputStream(s);
    InputStream is = null;
    if (is == null)
      return null;
    else
      return inputStreamToDocument(is);
  }

    public static void nodeToString(Node node,StringBuffer result,StringBuffer indent) {
      if (node == null) return;
      switch (node.getNodeType()) {
      case Node.DOCUMENT_NODE:
              if (node.hasChildNodes()) {
                NodeList nodeList = node.getChildNodes();
          for (int i = 0; i < nodeList.getLength(); i++)
                                                nodeToString(nodeList.item(i),result,indent);
              }
        break;
      case Node.ATTRIBUTE_NODE:
        result.append(" " + node.getNodeName() + "=\"" + node.getNodeValue() +"\"");
        break;
      case Node.CDATA_SECTION_NODE:
        result.append(indent.toString() + "<![CDATA\n" + ((CDATASection)node).getData() + "\n" + indent.toString() + "]]>\n");
        break;
      case Node.COMMENT_NODE:
        result.append(indent.toString() + "<!--"+((Comment)node).getData() + " -->\n");
        break;
      case Node.DOCUMENT_FRAGMENT_NODE:
        result.append(indent.toString() + "<" + node.getNodeName());
              if (node.hasAttributes()) {
                                        NamedNodeMap nnm = node.getAttributes();
          for (int i = 0;i < nnm.getLength();i++)
                                                nodeToString(nnm.item(i),result,indent);
              }
              if (!node.hasChildNodes())
                                        result.append("/>");
              else {
                result.append(">\n");
                NodeList nl = node.getChildNodes();
                for (int i = 0;i<nl.getLength();i++)
                  nodeToString(nl.item(i),result,indent.append("  "));
                            result.append("</" + node.getNodeName() + ">\n");
              }
        break;
      case Node.DOCUMENT_TYPE_NODE:
        DocumentType docType = (DocumentType)node;
        result.append(indent.toString() + "<!DOCTYPE " + docType.getName() + " ");
              result.append((docType.getPublicId() != "" ) ? "PUBLIC \"" + docType.getPublicId() +"\">" : "");
              result.append((docType.getSystemId() != "" ) ? "SYSTEM \"" + docType.getSystemId() +"\">" : "");
        break;
      case Node.ELEMENT_NODE:
        Element element = (Element)node;
     //Node element = node;
              result.append("<" + element.getNodeName() + " ");
        if (element.hasAttributes()) { //
          NamedNodeMap nnm = element.getAttributes();
          for (int i = 0; i<nnm.getLength(); i++)
            nodeToString(nnm.item(i),result,indent);
        }
        if (!element.hasChildNodes())
          result.append("/>\n");
        else {
          result.append(">\n");
          NodeList nl = element.getChildNodes();
          for (int i = 0; i<nl.getLength(); i++)
            nodeToString(nl.item(i),result,indent.append("  "));
          result.append("</" + element.getNodeName() + ">\n");
        }
        break;
      case Node.ENTITY_NODE:
        break;
      case Node.ENTITY_REFERENCE_NODE:
        break;
      case Node.NOTATION_NODE:
        break;
      case Node.PROCESSING_INSTRUCTION_NODE:
        ProcessingInstruction pi = (ProcessingInstruction)node;
        result.append(indent.toString() + "<?" + pi.getTarget() + " " + pi.getData() + " ?>\n");
        break;
      case Node.TEXT_NODE:
        Text txt = (Text)node;
              result.append(txt.getData() + "\n");
        break;
      default:
        break;
      }
    }

    public static final String nodeToString(Node node) {
      if (node == null)
        return "";
        StringBuffer result = new StringBuffer(""),indent = new StringBuffer("");
      nodeToString(node,result,indent);
      return result.toString();
    }

}