XML JAVA解析 -- DOM

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    dom ： document object model 文档对象模型
java dom就是基于w3c dom规范的一套实现,面向接口编程。
 
1. class diagram

其中： entittyresolver 和 errorhandler 来自于 sax api
 
2. 实例
 
domtest.java
 
package com.siyuan.xml;
import java.io.ioexception;
import javax.xml.parsers.documentbuilder;
import javax.xml.parsers.documentbuilderfactory;
import javax.xml.parsers.parserconfigurationexception;
import javax.xml.transform.source;
import javax.xml.transform.transformer;
import javax.xml.transform.transformerconfigurationexception;
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.attr;
import org.w3c.dom.document;
import org.w3c.dom.element;
import org.w3c.dom.namednodemap;
import org.w3c.dom.node;
import org.w3c.dom.nodelist;
import org.w3c.dom.text;
import org.xml.sax.saxexception;
import org.xml.sax.helpers.defaulthandler;
public class domtest {
 
 public static void printelement(element e) {
  system.out.println("element : " + e.getnodename() + "---------------");
  namednodemap attrs = e.getattributes();
  for (int i = 0; i < attrs.getlength(); i++) {
   attr attr = (attr) attrs.item(i);
   system.out.println("attribute[" + i + "] : " + attr.getname() + "=" + attr.getvalue());
  }
  nodelist children = e.getchildnodes();
  for (int i = 0; i < children.getlength(); i++) {
   node node = children.item(i);
   if (node instanceof text) {
    system.out.println("text node : " + ((text) node).getwholetext());
   } else {
    printelement((element) children.item(i));
   }
  }
 }
 
 /**
  * @param args
  * @throws parserconfigurationexception
  * @throws ioexception
  * @throws saxexception
  * @throws transformerexception
  */
 public static void main(string[] args) throws parserconfigurationexception, saxexception, ioexception, transformerexception {
  // todo auto-generated method stub
  documentbuilderfactory factory = documentbuilderfactory.newinstance();
  documentbuilder builder = factory.newdocumentbuilder();
  defaulthandler handler = new workershandler();
  builder.setentityresolver(handler);
  builder.seterrorhandler(handler);
  document document = builder.parse("src/com/siyuan/xml/workers.xml");
  printelement(document.getdocumentelement());
  
  transformerfactory transformerfactory = transformerfactory.newinstance();
  transformer transformer = transformerfactory.newtransformer();
  transformer.transform(new domsource(document.getdocumentelement()), new streamresult("src/com/siyuan/xml/workers1.xml"));
 }
}