Android 生成和Pull解析xml

概述一、单个对象生成xml生成以下xml，该怎么生成呢？ 1 123456 传说之美 2015-02-02 11:50:42先定义一个account类,属性有id、name、password、create

一、单个对象生成xml

生成以下xml，该怎么生成呢？

<?xml version='1.0' enCoding='UTF-8' standalone='yes' ?><account>  <ID>1</ID>  <password>123456</password>  <name>传说之美</name>  <createDate>2015-02-02 11:50:42</createDate></account>

先定义一个account类,属性有ID、name、password、createDate。

public class Account {    private String ID;    private String password;    private String name;    private String createDate;    public Account() {        super();    }    public Account(String ID,String password,String name,String createDate) {        super();        this.ID = ID;        this.password = password;        this.name = name;        this.createDate = createDate;    }    public String getID() {        return ID;    }    public voID setID(String ID) {        this.ID = ID;    }    public String getpassword() {        return password;    }    public voID setPassword(String password) {        this.password = password;    }    public String getname() {        return name;    }    public voID setname(String name) {        this.name = name;    }    public String getCreateDate() {        return createDate;    }    public voID setCreateDate(String createDate) {        this.createDate = createDate;    }    @OverrIDe    public String toString() {        return "Account [ID=" + ID + ",password=" + password + ",name=" + name + ",createDate=" + createDate + "]\n\n";    }}

定义好这个类，就可以利用XmlSerializer用于写xml数据了。写个方法，把生成的xml保存在xmlparser_account.xml文件。

	/**	 * 单个对象生成xml	 * @param account	 */	private static voID XmlfileCreator(Account account) {		file newxmlfile = new file(Environment.getExternalStorageDirectory() + "/xmlparser_account.xml");		try {			if (!newxmlfile.exists())				newxmlfile.createNewfile();		} catch (IOException e) {			Log.e("IOException","exception in createNewfile() method");		}		fileOutputStream fileos = null;		try {			fileos = new fileOutputStream(newxmlfile);		} catch (fileNotFoundException e) {			Log.e("fileNotFoundException","can't create fileOutputStream");		}		// XmlSerializer用于写xml数据		XmlSerializer serializer = Xml.newSerializer();		try {			// XmlSerializer 用 UTF-8 编码			serializer.setoutput(fileos,"UTF-8");			serializer.startdocument(null,Boolean.valueOf(true));			serializer.setFeature("http://xmlpull.org/v1/doc/features.HTML#indent-output",true);						serializer.startTag(null,"account");			// xml-tree，由startTag开始，endTag结束			serializer.startTag(null,"ID");			serializer.text(account.getID());			serializer.endTag(null,"ID");			serializer.startTag(null,"password");			serializer.text(account.getpassword());			serializer.endTag(null,"password");			serializer.startTag(null,"name");			serializer.text(account.getname());			serializer.endTag(null,"name");			serializer.startTag(null,"createDate");			serializer.text(account.getCreateDate());			serializer.endTag(null,"createDate");			serializer.endTag(null,"account");						serializer.enddocument();			// 写xml数据到fileOutputStream			serializer.flush();			// 关闭fileos，释放资源			fileos.close();		} catch (Exception e) {			Log.e("Exception","error occurred while creating xml file");		}	}

生成account对象，单个对象生成xml

		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");		Account account = new Account("1","123456","传说之美",sdf.format(new Date()));		XmlfileCreator(account);

查看保存的文件

二、解析单个对象组成的xml为单个对象

把生成的xmlparser_account.xml文件放在res/xml/下，将这个xml解析为Account对象。这里用XmlResourceParser，XmlResourceParser继承了xmlpullparse的类。

Pull解析和sax解析类似，都采用事件驱动进行解析的，当pull解析器，开始解析后，调用它的next()方法，获取下一个解析事件（包括4个解析事件：开始文档，结束文档，开始标签，结束标签），这里单单说一下Pull解析。

	/**	 * 解析单个对象组成的xml和xml组	 * @return	 */	private List<Account> getListData() {		List<Account> accountList = new ArrayList<Account>();		XmlResourceParser xrp = getResources().getXml(R.xml.xmlparser_account);		try {			// 直到文档的结尾处			Account account = null;			while (xrp.getEventType() != XmlResourceParser.END_document) {				String tagname = xrp.getname();								if (xrp.getEventType() == XmlResourceParser.START_document){									}				// 如果遇到了开始标签				if (xrp.getEventType() == XmlResourceParser.START_TAG) {					Log.i("",tagname);					if(tagname.equals("account")){						account = new Account();					} else if (account != null) {												if (tagname.equals("ID")) {							String ID = xrp.nextText();// 通过属性名来获取属性值							account.setID(ID);						} else if (tagname.equals("password")) {							String password = xrp.nextText();// 通过属性索引来获取属性值							account.setPassword(password);						} else if (tagname.equals("name")) {							String name = xrp.nextText();							account.setname(name);						} else if (tagname.equals("createDate")) {							String createDate = xrp.nextText();							account.setCreateDate(createDate);						}					}				}				if (xrp.getEventType() == XmlResourceParser.END_TAG) {					if (tagname.equals("account") && account !=null) {						accountList.add(account);						account = null;					}				}				xrp.next();// 获取解析下一个事件			}		} catch (XmlPullParserException e) {			e.printstacktrace();		} catch (IOException e) {			e.printstacktrace();		}		return accountList;	}

直接打印结果看看

Log.i("",getListData().toString());

log如下

 

三、单个对象组成的xml组

类似这样

<?xml version='1.0' enCoding='UTF-8' standalone='yes' ?><accounts>  <account>    <ID>2</ID>    <password>123456</password>    <name>传说</name>    <createDate>2015-02-02 02:54:41</createDate>  </account>  <account>    <ID>3</ID>    <password>567890</password>    <name>之美</name>    <createDate>2015-02-02 02:54:41</createDate>  </account></accounts>

生成单个对象组 组成的xml组跟单个对象xml基本差不多，写成了一个方法，把生成的xml保存在xmlparser_accounts.xml文件。

	/**	 * 生成单个对象的xml数组	 * 	 * @param data	 */	private static voID XmlfileCreator(List<Account> data) {		file newxmlfile = new file(Environment.getExternalStorageDirectory() + "/xmlparser_accounts.xml");		try {			if (!newxmlfile.exists())				newxmlfile.createNewfile();		} catch (IOException e) {			Log.e("IOException","can't create fileOutputStream");		}		XmlSerializer serializer = Xml.newSerializer();		try {			serializer.setoutput(fileos,true);			serializer.startTag(null,"accounts");			for (Account account : data) {				serializer.startTag(null,"account");				serializer.startTag(null,"ID");				serializer.text(account.getID());				serializer.endTag(null,"ID");				serializer.startTag(null,"password");				serializer.text(account.getpassword());				serializer.endTag(null,"password");				serializer.startTag(null,"name");				serializer.text(account.getname());				serializer.endTag(null,"name");				serializer.startTag(null,"createDate");				serializer.text(account.getCreateDate());				serializer.endTag(null,"createDate");				serializer.endTag(null,"account");			}			serializer.endTag(null,"accounts");			serializer.enddocument();			serializer.flush();			fileos.close();		} catch (Exception e) {			Log.e("Exception","error occurred while creating xml file");		}	}

简单地用几行代码生成

		Account account1 = new Account("2","传说",sdf.format(new Date()));		Account account2 = new Account("3","567890","之美",sdf.format(new Date()));		List<Account> accountList = new ArrayList<Account>();		accountList.add(account1);		accountList.add(account2);		XmlfileCreator(accountList);

生成的文件如下

四、解析单个对象组成的xml组

跟 二、解析单个对象组成的xml为单个对象 一样 ，请查看二

五、生成具有attribute的单个对象组成的xml组

类似如下，account里面还包含一个attribute值如何生成，其实很简单，在 三、单个对象组成的xml组 基础上修改一点就可以了

<?xml version='1.0' enCoding='UTF-8' standalone='yes' ?><accounts>  <account ID="2">    <password>123456</password>    <name>传说</name>    <createDate>2015-02-02 04:50:45</createDate>  </account>  <account ID="3">    <password>567890</password>    <name>之美</name>    <createDate>2015-02-02 04:50:45</createDate>  </account></accounts>

修改地方为

			for (Account account : data) {				serializer.startTag(null,"account");				serializer.attribute(null,"ID",account.getID());//				serializer.startTag(null,"ID");//				serializer.text(account.getID());//				serializer.endTag(null,"account");			}

六、解析具有attribute的单个对象组成的xml组

解析同理，跟四、解析单个对象组成的xml组 差不多，修改ID部分解析即可

				// 如果遇到了开始标签				if (xrp.getEventType() == XmlResourceParser.START_TAG) {					Log.i("",tagname);					if(tagname.equals("account")){						account = new Account();						String ID = xrp.getAttributeValue(null,"ID");						account.setID(ID);					} else if (account != null) {												if (tagname.equals("ID")) {//							String ID = xrp.nextText();//							account.setID(ID);						} else if (tagname.equals("password")) {							String password = xrp.nextText();							account.setPassword(password);						} else if (tagname.equals("name")) {							String name = xrp.nextText();							account.setname(name);						} else if (tagname.equals("createDate")) {							String createDate = xrp.nextText();							account.setCreateDate(createDate);						}					}				}

本文原创链接：http://www.cnblogs.com/liqw/p/4267461.html

下载地址：http://download.csdn.net/detail/lqw770737185/8417583

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