利用XMLBean轻轻松松读写XML

<billingAddress>
<receiver>Ms Danielle</receiver>
<postalCode>350107</postalCode>
<addressLine1>#167</addressLine1>
<addressLine2>NORTH TOWER HARBOUR CITY</addressLine2>
</billingAddress>
</address>
</customer>
</Customers>

　　七、利用XMLBean修改XML文件

　　我们再增加一个Method:

public void updateCustomer(int id,String lastname) {
try {
File xmlFile = new File(filename);
CustomersDocument doc = CustomersDocument.Factory.parse(xmlFile);
CustomerType[] customers = doc.getCustomers().getCustomerArray();

for (int i = 0; i < customers.length; i ) {
CustomerType customer = customers[i];
if(customer.getId()==id){
customer.setLastname(lastname);
break;
}
}
doc.save(xmlFile);
} catch (Exception ex) {
ex.printStackTrace();
}
}

　　main method:

public static void main(String[] args) {
String filename = "F://JavaTest//Eclipse//XMLBean//xml//customers_new.xml";

CustomerXMLBean customerXMLBean = new CustomerXMLBean(filename);

customerXMLBean.updateCustomer(3,"last");
}

　　运行之后,我们将会看到客户编号为3的客户的lastname已经改为last.

　　八、利用XMLBean删除一个customer

　　再增加一个Method:

public void deleteCustomer(int id) {
try {
File xmlFile = new File(filename);
CustomersDocument doc = CustomersDocument.Factory.parse(xmlFile);
CustomerType[] customers = doc.getCustomers().getCustomerArray();

for (int i = 0; i < customers.length; i ) {
CustomerType customer = customers[i];
if(customer.getId()==id){
customer.setNil() ;
break;
}
}
doc.save(xmlFile);
} catch (Exception ex) {
ex.printStackTrace();
}
}

　　main method:

public static void main(String[] args) {
String filename = "F://JavaTest//Eclipse//XMLBean//xml//customers_new.xml";

CustomerXMLBean customerXMLBean = new CustomerXMLBean(filename);

customerXMLBean.deleteCustomer(3);
}

　　运行,我们将会看到客户编号为3的客户的资料已经被删除.

　　九、查询XML

　　除了本文在以上讲述的,利用XMLBean能轻轻松松完成XML的读写操作外,结合XPath和XQuery,XMLBean还能完成象SQL查询数据库一样方便地查询XML数据. 关于XML查询以及如何创建XML数据库, 我将在另一篇文章里讨论.

　　十、结束语

　　XMLBean能帮助我们轻易读写XML,这将有助于我们降低XML的学习和使用,有了这个基础,开发人员将为学习更多地XML相关技术和Web Services,JMS等其他J2EE技术打下良好地基础.

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作者:叶枫(http://blog.matrix.org.cn/page/叶枫)
原文地址:http://www.matrix.org.cn/resource/article/44/44027_XMLBean.html

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