Android 生成和Pull解析xml

一、單個對象生成xml

生成以下xml，該怎么生成呢？

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<account>
  <id>1</id>
  <password>123456</password>
  <name>傳說之美</name>
  <createDate>2015-02-02 11:50:42</createDate>
</account>

先定義一個account類,屬性有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";
    }
}

定義好這個類，就可以利用XmlSerializer用於寫xml數據了。寫個方法，把生成的xml保存在xmlparser_account.xml文件。

	/**
	 * 單個對象生成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用於寫xml數據
		XmlSerializer serializer = Xml.newSerializer();
		try {
			// XmlSerializer 用 UTF-8 編碼
			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開始，endTag結束
			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();
			// 寫xml數據到FileOutputStream
			serializer.flush();

			// 關閉fileos，釋放資源
			fileos.close();
		} catch (Exception e) {
			Log.e("Exception", "error occurred while creating xml file");
		}
	}

生成account對象，單個對象生成xml

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

查看保存的文件

二、解析單個對象組成的xml為單個對象

把生成的xmlparser_account.xml文件放在res/xml/下，將這個xml解析為Account對象。這里用XmlResourceParser，XmlResourceParser繼承了xmlpullparse的類。

Pull解析和sax解析類似，都采用事件驅動進行解析的，當pull解析器，開始解析后，調用它的next()方法，獲取下一個解析事件（包括4個解析事件：開始文檔，結束文檔，開始標簽，結束標簽），這里單單說一下Pull解析。

	/**
	 * 解析單個對象組成的xml和xml組
	 * @return
	 */
	private List<Account> getListData() {
		List<Account> accountList = new ArrayList<Account>();
		XmlResourceParser xrp = getResources().getXml(R.xml.xmlparser_account);
		try {
			// 直到文檔的結尾處
			Account account = null;
			while (xrp.getEventType() != XmlResourceParser.END_DOCUMENT) {
				String tagName = xrp.getName();
				
				if (xrp.getEventType() == XmlResourceParser.START_DOCUMENT){
					
				}

				// 如果遇到了開始標簽
				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();// 通過屬性名來獲取屬性值
							account.setId(id);
						} else if (tagName.equals("password")) {
							String password = xrp.nextText();// 通過屬性索引來獲取屬性值
							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();// 獲取解析下一個事件
			}
		} catch (XmlPullParserException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return accountList;
	}

直接打印結果看看

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

log如下

 

三、單個對象組成的xml組

類似這樣

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<accounts>
  <account>
    <id>2</id>
    <password>123456</password>
    <name>傳說</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>

生成單個對象組 組成的xml組跟單個對象xml基本差不多，寫成了一個方法，把生成的xml保存在xmlparser_accounts.xml文件。

	/**
	 * 生成單個對象的xml數組
	 * 
	 * @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", "exception in createNewFile() method");
		}
		FileOutputStream fileos = null;
		try {
			fileos = new FileOutputStream(newxmlfile);
		} catch (FileNotFoundException e) {
			Log.e("FileNotFoundException", "can't create FileOutputStream");
		}
		XmlSerializer serializer = Xml.newSerializer();
		try {
			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, "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");
		}
	}

簡單地用幾行代碼生成

		Account account1 = new Account("2", "123456", "傳說", 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、解析單個對象組成的xml組

跟 二、解析單個對象組成的xml為單個對象 一樣 ，請查看二

五、生成具有attribute的單個對象組成的xml組

類似如下，account里面還包含一個attribute值如何生成，其實很簡單，在 三、單個對象組成的xml組 基礎上修改一點就可以了

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<accounts>
  <account id="2">
    <password>123456</password>
    <name>傳說</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>

修改地方為

			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, "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");
			}

六、解析具有attribute的單個對象組成的xml組

解析同理，跟四、解析單個對象組成的xml組 差不多，修改id部分解析即可

				// 如果遇到了開始標簽
				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);
						}
					}
				}

本文原創鏈接：http://www.cnblogs.com/liqw/p/4267461.html

下載地址：http://download.csdn.net/detail/lqw770737185/8417583