使用Dom解析xml文件

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以前，曾经解析xml文件，仅仅为了能够实现结果而解析，觉得简单。在昨天做的项目中，需要解析xml文件，发现之前并没有深入进去。静下心来，好好的看了看书，受益匪浅。下面举几个常见的例子说明一下Dom的基本用法。

引用的xml文件（borrowed.xml）：

〈?xml version="1.0" encoding="GB2312"?>
〈NewDataSet xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:noNamespaceSchemaLocation="C:\sourcelist\borrowed.xsd">
 〈record>
  〈BDate>2001-06-1800:00:00.0〈/BDate>
 〈BPieces>0〈/BPieces>
 〈DNo>00020〈/DNo>
 〈MNo>0001〈/MNo>
  〈RDate>2001-09-1800:00:00.0〈/RDate>
 〈RNo>01    1〈/RNo>
 〈STATUS>1〈/STATUS>
 〈/record>
 〈record>
  〈BDate>2001-06-1800:00:00.0〈/BDate>
 〈BPieces>0〈/BPieces>
 〈DNo>00053〈/DNo>
 〈MNo>0001〈/MNo>
  〈RDate>2001-09-1800:00:00.0〈/RDate>
 〈RNo>01    2〈/RNo>
 〈STATUS>1〈/STATUS>
 〈/record>
 〈record>
  〈BDate>2001-06-1800:00:00.0〈/BDate>
 〈BPieces>0〈/BPieces>
 〈DNo>00086〈/DNo>
 〈MNo>0004〈/MNo>
  〈RDate>2001-09-1800:00:00.0〈/RDate>
 〈RNo>01    3〈/RNo>
 〈STATUS>1〈/STATUS>
 〈/record>
 〈record>
  〈BDate>2001-06-1800:00:00.0〈/BDate>
 〈BPieces>0〈/BPieces>
 〈DNo>00053〈/DNo>
 〈MNo>0001〈/MNo>
  〈RDate>2001-09-1800:00:00.0〈/RDate>
 〈RNo>01    2〈/RNo>
 〈STATUS>1〈/STATUS>
 〈/record>

〈/NewDataSet>

 

1.  获取xml文件的版本和字符格式

 
 public void get_versionANDencoding()
 {
  try
  {
   DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
   DocumentBuilder builder =factory.newDocumentBuilder();
   Document document =builder.parse(new File("borrowed.xml"));
  
   String version =document.getXmlVersion();
  System.out.println("xml文件的版本为："+version);
   String encoding =document.getXmlEncoding();
  System.out.println("xml文件的编码为："+encoding);
  }catch (Exceptione){e.printStackTrace();} 
 }

2.  获取xml文件的头结点

 

 public void get_rootName()
 {
  try
  {
   DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
   DocumentBuilder builder =factory.newDocumentBuilder();
   Document document =builder.parse(new File("borrowed.xml"));
  
   Element root =document.getDocumentElement();
   String rootName =root.getNodeName();
  System.out.println("xml文件根节点的名称为："+ rootName);
  }catch(Exception e){e.printStackTrace();}
 }

 

3.  获取xml文件的头结点的子节点以及子节点的相关内容

方法一：

 public void get_root_childNameAndcontent()
 {
  try
  {
   DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
   DocumentBuilder builder =factory.newDocumentBuilder();
   Document document =builder.parse(new File("borrowed.xml"));
    
   NodeList nodelist =document.getElementsByTagName_r("record");
   int size =nodelist.getLength();
   for(int i=0; i〈size;i++)
   {
    Node node =nodelist.item(i);
    String name= node.getNodeName();
    Stringcontent = node.getTextContent();
   System.out.println(name);
   System.out.println(" " + content);
   }
  }catch(Exception e){e.printStackTrace();}
 }

 

方法二：

 
 public void get_root_childNameAndContent()
 {
  try
  {
   DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
   DocumentBuilder builder =factory.newDocumentBuilder();
   Document document =builder.parse(new File("borrowed.xml"));
  
   Element root =document.getDocumentElement();
   NodeList nodelist =root.getChildNodes();
   int size =nodelist.getLength();
  System.out.println(size);
   for(int i=0; i〈size;i++)
   {
    Node node =nodelist.item(i);
    if(node.getNodeType()== Node.ELEMENT_NODE)
    {
    Element elementNode = (Element)node;
    String name = elementNode.getNodeName();
    String content = elementNode.getTextContent();
    System.out.println(name + "\n" + content);
    }
   }
  }catch(Exception e){e.printStackTrace();}
 }

 

4.  获取xml文件头结点的子节点名称

 

 public void get_root_childName()
 {
  try
  {
   DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
   DocumentBuilder builder =factory.newDocumentBuilder();
   Document document =builder.parse(new File("borrowed.xml"));
  
   Element root =document.getDocumentElement();
   NodeList nodelist =root.getChildNodes();
   int size =nodelist.getLength();
  System.out.println(size);
   for(int i=0; i〈size;i++)
   {
    Node node =nodelist.item(i);
    if(node.getNodeType()== Node.ELEMENT_NODE)
    {
    Element elementNode = (Element)node;
    String name = elementNode.getNodeName();
    System.out.println(name);
    }
   }
  }catch(Exception e){e.printStackTrace();}
 }

 

5. 获取孙子节点的名称和值，生成xml格式的字符串，便于表格显示

 
 public Stringget_root_childName_childName()
 {
  String child_childname="";
  StringBuffer nodename = newStringBuffer();
  try
  {
   DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
   DocumentBuilder builder =factory.newDocumentBuilder();
   Document document =builder.parse(new File("borrowed.xml"));
 
   Element root =document.getDocumentElement();
   NodeList child =root.getElementsByTagName_r("record");
   int size =child.getLength();
  System.out.println(size);
   nodename.append("〈?xmlversion="1.0" encoding="GB2312"?>");
   nodename.append("\n〈tableborder=1>"); 
   Node node =child.item(1);
   if (node.getNodeType()==Node.ELEMENT_NODE)
   {    
    Element elementNode = (Element)node.getChildNodes();
    NodeList elementNodeChild = elementNode.getChildNodes();
    int size1 = elementNodeChild.getLength();
    nodename.append("\n〈tr>");
    for (int j=0; j〈size1;j++)
    {
     Node node1 = elementNodeChild.item(j);
     if (node1.getNodeType()==Node.ELEMENT_NODE)
     {
      Element elementNode1 = (Element)node1.getChildNodes();
      String name = elementNode1.getNodeName();

      nodename.append("\n  〈th>");
      nodename.append(name);
      nodename.append("〈/th>");
     }
    }
    nodename.append("\n〈/tr>");
    }
   Stringvalues=GetNodue(root);
   nodename.append(values);
  nodename.append("\n〈/table>");
   child_childname =nodename.toString();
  }catch(Exception e){e.printStackTrace();}
  return child_childname;
 }

 

 public String GetNodue(Element root)
 {
  String nodue="";
  StringBuffer nodues = newStringBuffer();
  NodeList child =root.getElementsByTagName_r("record");
  int size = child.getLength();
  System.out.println(size);

  for(int i=0; i〈size; i++)
  {
   Node node =child.item(i);
   if (node.getNodeType()==Node.ELEMENT_NODE)
   {
    ElementelementNode = (Element)node.getChildNodes();
    NodeListelementNodeChild = elementNode.getChildNodes();
    int size1 =elementNodeChild.getLength();
   nodues.append("\n〈tr>");
    for (intj=0; j〈size1;j++)
    {
    Node node1 = elementNodeChild.item(j);
    if (node1.getNodeType()==Node.ELEMENT_NODE)
    {
     Element elementNode1 = (Element)node1.getChildNodes();
     String content = elementNode1.getTextContent();
     nodues.append("\n 〈td>");
     nodues.append(content);
     nodues.append("〈/td>");
    }
    }
   nodues.append("\n〈/tr>");
   }
  }
  nodue = nodues.toString();
  return nodue;
 }

 

   以上只是列举了几个xml文件的简单操作