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、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 ListgetListData() { List accountList = new ArrayList (); 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
2 123456 传说 2015-02-02 02:54:41 3 567890 之美 2015-02-02 02:54:41
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(Listdata) { 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"); } }
简单地用几行代码生成
Account account1 = new Account("2", "123456", "传说", sdf.format(new Date()));
Account account2 = new Account("3", "567890", "之美", sdf.format(new Date()));
List accountList = new ArrayList();
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
123456 传说 2015-02-02 04:50:45 567890 之美 2015-02-02 04:50:45
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, "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
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