DOM

 InputStream in=getResources().openRawResource(R.raw.book);         DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();         try {            DocumentBuilder dBuilder=dbFactory.newDocumentBuilder();             Document doc=dBuilder.parse(in);              Log.i(TAG," doc NodeType "+doc.getNodeType());             NodeList bookList=doc.getElementsByTagName("book");              for (int i=0;i<bookList.getLength();i++){                Node book=bookList.item(i);                 if (book.getNodeType()==Node.ELEMENT_NODE){                     Log.i(TAG,"-----------book-------------");                     Element bookElement=(Element)book;                     count++;                     Log.i(TAG,"count :"+count+"  "+bookElement.getAttribute("id"));                     Element nameEle=(Element)bookElement.getElementsByTagName("name").item(0);                     Log.i(TAG,"name NodeType "+nameEle.getNodeType());                     Log.i(TAG,"   ss : "+nameEle.getAttribute("ss"));                     Log.i(TAG,"  name: "+nameEle.getTextContent());                     NodeList authorList=bookElement.getElementsByTagName("author");                     for (int j=0;j<authorList.getLength();j++){                         Node authorNode=authorList.item(j);                         Log.i(TAG,"NodeType :　"+authorNode.getNodeType());                         Element authorEle=(Element)authorNode;                         Log.i(TAG,"     author "+j+" :"+authorEle.getTextContent());                     }                }            }        } catch (ParserConfigurationException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (SAXException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } 

遍历整个树

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public void loopXml() {       try{           InputStream in=getResources().openRawResource(R.raw.book);            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();             DocumentBuilder dBuilder=dbFactory.newDocumentBuilder();            Document doc=dBuilder.parse(in);           if (doc.hasChildNodes()){                printNode(doc.getChildNodes());            }       } catch(Exception e){           e.printStackTrace();        }    }     public void printNode(NodeList nodeList){        for (int i=0;i<nodeList.getLength();i++){            Node node=nodeList.item(i);             if (node.getNodeType()==Node.ELEMENT_NODE){                 Log.i(TAG,"<"+node.getNodeName()+">");                 if (node.hasAttributes()){                    NamedNodeMap nodeMap=node.getAttributes();                     for (int j=0;j<nodeMap.getLength();j++){                        Node no=nodeMap.item(j);                         Log.i(TAG, "      "+no.getNodeName()+"  "+no.getNodeValue());                     }                }                 if (node.hasChildNodes()){                    printNode(node.getChildNodes());                 } else {                    Log.i(TAG,"  "+node.getTextContent());                 }                Log.i(TAG,"<"+node.getNodeName()+"/>");             } else {                if (node.getNodeType()==Node.TEXT_NODE){                    Text text=(Text)node;                    Log.i(TAG,"    "+text.getTextContent());                 }//              Log.i(TAG,"nodetype "+node.getNodeType()+"  not Ele :"+node.getNodeName()+"   "+node.getNodeValue());             }        }    }

DOM方式下所有内容都是存在节点Node中的，<name>godlike</name> 节点的类型是Node.ELEMENT_NODE，而godlike的类型是TEXT_NODE。

生成XML文件

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Mode类

public class Mode {    String id;     String reason;     List<String> thought;     Mode(){    }    Mode(int n,String... strings){        thought=Arrays.asList(strings);    }     public List<String> getTh(){        return thought;     }    public void setId(String id){        this.id=id;     }    public String getReason(){        return reason;     }    public String getId(){        return id;     }    public void setReason(String reason){        this.reason=reason;     }    public void f(int ...f){    }}

初始化

Mode mode=new Mode(3,"lirui","hao","fan");         mode.setId("1");         mode.setReason("nonono");         list.add(mode);         mode=new Mode(1,"xxx");         mode.setId("2");         mode.setReason("sikao");         list.add(mode);         createXml(list); 

主要代码

public void createXml(List<Mode> list){          Document doc;         Element modes;         Element mode;         Element reason;         Element thought;         try{            DocumentBuilderFactory dbFactory=DocumentBuilderFactory.newInstance();             DocumentBuilder builder=dbFactory.newDocumentBuilder();              doc=builder.newDocument();             if (doc!=null){                modes=doc.createElement("modes");                 for (int i=0;i<list.size();i++){                    mode=doc.createElement("mode");                     mode.setAttribute("id", list.get(i).getId());                     reason=doc.createElement("reason");                     reason.appendChild(doc.createTextNode(list.get(i).getReason()));                    mode.appendChild(reason);                     List<String> strs=list.get(i).getTh();                     for (int j=0;j<strs.size();j++){                        thought=doc.createElement("thought");                         thought.appendChild(doc.createTextNode(strs.get(j)));                         mode.appendChild(thought);                     }                    modes.appendChild(mode);                 }                doc.appendChild(modes);                 TransformerFactory transF=TransformerFactory.newInstance();                 Transformer t=transF.newTransformer();                DOMSource source=new DOMSource(doc);                   Log.i(TAG,"thi OKKKK");                  Log.i(TAG,Environment.getExternalStorageState());                  Log.i(TAG,Environment.getExternalStorageDirectory().getPath()+"/xx.xml");                 StreamResult result=new StreamResult(Environment.getExternalStorageDirectory().getPath()+"/xx.xml");                  t.transform(source, result);                    Log.i(TAG,"OKKKK");             }        } catch(Exception e){            e.printStackTrace();             Log.i(TAG,"NOT  OKKKK");             Log.i(TAG,e.getMessage());         }    }

几点问题：

1. 如何获得外挂存储卡的位置Environment.getExternalStorageDirectory().getPath()+"/xx.xml"在小米手机上这是手机自带的存储卡的位置，不是SD卡。要想读写存储卡还需要权限<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
2. 可变参数是数组。