dom4j 03
通过将上一篇的更改，将Java对象映射到xml文件中扩展性增强！
1、想看两个简单的实体类
public class FriendsInfo extends BasePojo{
String name ;
String gtalk;
String address;
String image;
String QQ;
String MSN;
public FriendsInfo(String name, String address) {
this.address =address;
this.name = name;
}
public FriendsInfo() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGtalk() {
return gtalk;
}
public void setGtalk(String gtalk) {
this.gtalk = gtalk;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getQQ() {
return QQ;
}
public void setQQ(String qQ) {
QQ = qQ;
}
public String getMSN() {
return MSN;
}
public void setMSN(String mSN) {
MSN = mSN;
}
}
public class BookInfo extends BasePojo{
String name = "";
String title = "";
String context ="";
String price = "";
String show = "";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContext() {
return context;
}
public void setContext(String context) {
this.context = context;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getShow() {
return show;
}
public void setShow(String show) {
this.show = show;
}
2、两个实体类的父类
public class BasePojo {
}
3、处理所需要的介面
public interface DOMExecute {
public void addInfo(BasePojo basepojo);
public void delInfo(BasePojo basepojo);
public void changeInfo(BasePojo basepojo);
public List getinfo();
public void createDocument( String dir);
}
4、用到的适配器
public class EnumerationAdapter implements Iterator {
private Enumeration enumeration;
EnumerationAdapter(Enumeration enumeration) {
this.enumeration = enumeration;
}
// 转接介面
public boolean hasNext() {
return enumeration.hasMoreElements();
}
public Object next() {
return enumeration.nextElement();
}
public void remove() {
}
}
5、处理类的父类
public abstract class baseDomHander implements DOMExecute{
ModeDocumentFactory modeDocumentFactory;
private String dir = modeDocumentFactory.getDIR();
public baseDomHander(ModeDocumentFactory modeFactory){
modeDocumentFactory = modeFactory;
}
public ModeDocumentFactory getModeDocumentFactory() {
return modeDocumentFactory;
}
public void setModeDocumentFactory(ModeDocumentFactory modeDocumentFactory) {
this.modeDocumentFactory = modeDocumentFactory;
}
public String getDir() {
return dir;
}
public void setDir(String dir) {
this.dir = dir;
}
public void saveXml(Document document,String dir){
try{
XMLWriter output = null;
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("UTF-8");
output = new XMLWriter(new FileWriter(new File(dir)),format);
output.write(document);
output.close();
}catch(Exception ex){
ex.printStackTrace();
}
}
public void addEleText(Element el, String text) {
if(text!=null)
el.addText(text);
}
6、Bookinfo的处理类
public class bookDomHander extends baseDomHander{
private String dir ;
public bookDomHander(ModeDocumentFactory modeFactory) {
super(modeFactory);
}
@Override
public void delInfo(BasePojo basepojo) {
BookInfo bi = (BookInfo)basepojo;
Document document=null;
SAXReader saxReader = new SAXReader();
try{
FileReader fr= new FileReader(new File(getDir()));
document = saxReader.read(fr);
}catch(Exception e){
e.printStackTrace();
}
List list = document.selectNodes("//books/book/name");
Iterator iter = list.iterator();
while(iter.hasNext()){
System.out.print("###########\n");
if(iter.hasNext()){
Element ownerElement = (Element)iter.next();
if(ownerElement.getText().equals(bi.getName()))
ownerElement.getParent().getParent().remove(ownerElement.getParent());
}
}
saveXml(document, getDir());
}
@Override
public List getinfo() {
return null;
}
@Override
public void createDocument( String dir) {
setDir(dir);
Document document = DocumentHelper.createDocument();
Element books = document.addElement("books");
Element book=books.addElement("book");
Element title=book.addElement("title");
title.addAttribute("show", "yes");
Element context=book.addElement("context");
Element qq=book.addElement("qq");
Element address=book.addElement("price");
try{
XMLWriter output = new XMLWriter(
new FileWriter(new File(dir)));
output.write( document );
output.close();
} catch(IOException e){System.out.println(e.getMessage());
}
saveXml(document, dir);
}
@Override
public void addInfo(BasePojo basepojo) {
BookInfo bi = (BookInfo)basepojo;
Document document=null;
SAXReader saxReader = new SAXReader();
try{
FileReader fr= new FileReader(new File(this.getDir()));
document = saxReader.read(fr);
}catch(Exception e){
e.printStackTrace();
}
Element catalogElement = document.getRootElement();
Element book=catalogElement.addElement("book");
Element name=book.addElement("name");
addEleText(name,bi.getName());
Element title=book.addElement("title");
addEleText(title,bi.getTitle());
Element show = title.addAttribute("show", bi.getShow());
Element context = book.addElement("context");
addEleText(context,bi.getContext());
saveXml(document, this.getDir());
}
public String getDir() {
return dir;
}
public void setDir(String dir) {
this.dir = dir;
}
@Override
public void changeInfo(BasePojo basepojo) {
}
}
7、friendinfo的处理类
public class friendDomHander extends baseDomHander{
public friendDomHander(ModeDocumentFactory modeFactory) {
super(modeFactory);
}
public void addInfo(FriendsInfo fi) {
org.dom4j.Document document=null;
org.dom4j.io.SAXReader saxReader = new org.dom4j.io.SAXReader();
try{
FileReader fr= new FileReader(new File(getDir()));
document = saxReader.read(fr);
}catch(Exception e){
e.printStackTrace();
}
Element catalogElement = document.getRootElement();
Element fmessage=catalogElement.addElement("message");
Element name=fmessage.addElement("name");
addEleText(name,fi.getName());
Element gtalk=fmessage.addElement("gtalk");
addEleText(gtalk,fi.getGtalk());
Element msn=fmessage.addElement("msn");
addEleText(msn,fi.getMSN());
Element qq=fmessage.addElement("qq");
addEleText(qq,fi.getQQ());
Element address=fmessage.addElement("address");
addEleText(address,fi.getAddress());
Element image=fmessage.addElement("image");
addEleText(image,fi.getImage());
saveXml(document, getDir());
}
public void changeInfo(BasePojo basepojo){
delInfo(basepojo);
addInfo(basepojo);
}
@Override
public void delInfo(BasePojo basepojo) {
FriendsInfo fi = (FriendsInfo)basepojo;
Document document=null;
SAXReader saxReader = new SAXReader();
try{
FileReader fr= new FileReader(new File(getDir()));
document = saxReader.read(fr);
}catch(Exception e){
e.printStackTrace();
}
List list = document.selectNodes("//friends/message/name");
Iterator iter = list.iterator();
while(iter.hasNext()){
System.out.print("###########\n");
if(iter.hasNext()){
Element ownerElement = (Element)iter.next();
if(ownerElement.getText().equals(fi.getName()))
ownerElement.getParent().getParent().remove(ownerElement.getParent());
}
}
saveXml(document, getDir());
}
@Override
public List getinfo() {
return null;
}
@Override
public void createDocument( String dir) {
setDir(dir);
Document document = DocumentHelper.createDocument();
Element catalogElement = document.addElement("friends");
Element fmessage=catalogElement.addElement("message");
Element image=fmessage.addElement("image");
Element name=fmessage.addElement("name");
Element gtalk=fmessage.addElement("gtalk");
Element msn=fmessage.addElement("msn");
Element qq=fmessage.addElement("qq");
Element address=fmessage.addElement("address");
fmessage=catalogElement.addElement("message");
try{
XMLWriter output = new XMLWriter(
new FileWriter(new File(dir)));
output.write( document );
output.close();
} catch(IOException e){System.out.println(e.getMessage());
}
saveXml(document, dir);
}
@Override
public void addInfo(BasePojo basePojo) {
delInfo( basePojo);
FriendsInfo fi = (FriendsInfo)basePojo;
Document document=null;
SAXReader saxReader = new SAXReader();
try{
FileReader fr= new FileReader(new File(this.getDir()));
document = saxReader.read(fr);
}catch(Exception e){
e.printStackTrace();
}
Element catalogElement = document.getRootElement();
Element fmessage=catalogElement.addElement("message");
Element name=fmessage.addElement("name");
addEleText(name,fi.getName());
Element gtalk=fmessage.addElement("gtalk");
addEleText(gtalk,fi.getGtalk());
Element msn=fmessage.addElement("msn");
addEleText(msn,fi.getMSN());
Element qq=fmessage.addElement("qq");
addEleText(qq,fi.getQQ());
Element address=fmessage.addElement("address");
addEleText(address,fi.getAddress());
Element image=fmessage.addElement("image");
addEleText(image,fi.getImage());
saveXml(document, this.getDir());
}
}
8、单例工厂
public class ModeDocumentFactory{
public static HashMap<String, baseDomHander> infoClassNameAndHandlerPool ;
private static ResourceBundle resource;
//默认xml路径
private static String DIR;
//处理bean对象到xml的类
private static baseDomHander hander = null;
static{
//将bean的classname作为key，处理bean的类作为value
infoClassNameAndHandlerPool = new HashMap<String, baseDomHander>();
}
public static ModeDocumentFactory instance = null;
// private ThreadLocal perThreadCacheDir = new ThreadLocal();
private ModeDocumentFactory(){
try {
init();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public static ModeDocumentFactory getInstance(){
if(instance != null ){
return instance;
}else{
instance = new ModeDocumentFactory();
}
return instance;
}
private void init() throws InstantiationException, IllegalAccessException, ClassNotFoundException{
//获得配置文件对应的key -- value
resource = ResourceBundle.getBundle("property");
Enumeration infoCN = resource.getKeys();
// Enumeration转换为Iterator 的对象适配器（这里纯粹是练习适配器模式）
EnumerationAdapter enumerationAdapter= new EnumerationAdapter(infoCN);
while( enumerationAdapter.hasNext() ) {
String CN = (String) enumerationAdapter.next();
System.out.println(CN);
String handerType = getHanderCN(CN);
System.out.println(handerType);
Class<?> classObject = Class.forName(handerType);
//Class classObject = Thread.currentThread().getContextClassLoader().loadClass(handerType);
Constructor<?> constructor = null;
try {
constructor = classObject.getConstructor(new Class[]{ModeDocumentFactory.class} );
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
try {
//使用反射将value实例化，将ModeDocumentFactory传给实例
hander = (baseDomHander)constructor.newInstance(this);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
//将处理对象放进内存里
infoClassNameAndHandlerPool.put(CN, hander );
}
}
public static String getDIR() {
return DIR;
}
public String getHanderCN(String key){
return resource.getString(key);
}
public static baseDomHander createDocument(Class c,String dir){
baseDomHander bdHander = getHandlerFromPool( c);
if(dir!=""&&dir!=null){
DIR=dir;
}
bdHander.createDocument(DIR);
return bdHander;
}
public static baseDomHander createDocument(BasePojo basepojo ){
baseDomHander bdHander = getHandlerFromPool( basepojo.getClass());
bdHander.createDocument(DIR);
return bdHander;
}
public static void addInfo(BasePojo basepojo ){
baseDomHander bdHander = getHandlerFromPool( basepojo.getClass());
bdHander.addInfo(basepojo);
}
public static void main(String[] args) {
String filename = "d:/friends.xml";
String bookfilename = "d:/books.xml";
ModeDocumentFactory instance = ModeDocumentFactory.getInstance();
BookInfo finfo = creatbookinfo(); //createtmepinfo();
instance.createDocument(BookInfo.class,bookfilename);
instance.addInfo(finfo);
//instance.addInfo(finfo);
//instance.delInfo(finfo);
}
public static baseDomHander getHandlerFromPool(Class c){
String key = c.getName();
String[] keys = key.split("\\.");
String lastKey = keys[keys.length-1];
baseDomHander bdHander = (baseDomHander)infoClassNameAndHandlerPool.get(lastKey);
return bdHander ;
}
public static void delInfo(BasePojo basepojo) {
baseDomHander bdHander = getHandlerFromPool( basepojo.getClass());
bdHander.delInfo(basepojo);
}
public static void changeInfos(BasePojo basepojo) {
baseDomHander bdHander = getHandlerFromPool( basepojo.getClass());
bdHander.changeInfo(basepojo);
}
public static List getinfo() {
return null;
}
public static FriendsInfo createtmepinfo(){
FriendsInfo friendsinfo=new FriendsInfo("gao","lanyungang");
friendsinfo.setQQ("120316879");
friendsinfo.setImage("/images/text.png");
return friendsinfo;
}
public static BookInfo creatbookinfo(){
BookInfo bookInfo=new BookInfo();
bookInfo.setName("java");
bookInfo.setTitle("java_title");
bookInfo.setContext("内容");
bookInfo.setPrice("1000");
bookInfo.setShow("yes");
return bookInfo;
}
}
9.
BookInfo=com.ysen.dom02.bookDomHander FriendsInfo=com.ysen.dom02.friendDomHander