在 Java 中如何使用 DOM 解析器创建 XML 文件? 将 DOM 写为 XML 文件
已发表: 2019-01-11
正如我们之前学习的“在 Java 中计算 XML 元素数量的简单方法”,这里是另一个用 Java 编写 XML 文件的简单 Java 代码(DOM Parser)。
- 将 DOM 写为 XML 文件
- Java DOM 教程 – 在 Java 中使用 DOM 编写 XML
- 如何在 Java 中编写 XML 文件(DOM 解析器)
- Java:用 Java 编写 XML (DOM) 文件的简单方法
这就是我在这里所做的:
- 使用名称创建根 XML 元素:
Companies
- 创建 4 个
Company
元素 - 每个公司元素都有一个属性
id
- 每个公司元素都有 3 个元素——
Name, Type, Employee
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package crunchify . com . tutorials ; import org . w3c . dom . Document ; import org . w3c . dom . Element ; import org . w3c . dom . Node ; import javax . xml . parsers . DocumentBuilder ; import javax . xml . parsers . DocumentBuilderFactory ; import javax . xml . transform . OutputKeys ; import javax . xml . transform . Transformer ; import javax . xml . transform . TransformerFactory ; import javax . xml . transform . dom . DOMSource ; import javax . xml . transform . stream . StreamResult ; /** * @author Crunchify.com * In Java How to Create XML File using DOM parser? Writing Out a DOM as an XML File. * Version: 1.1 */ public class CrunchifyCreateXMLDOM { public static void main ( String [ ] args ) { // Defines a factory API that enables applications to obtain a parser that produces DOM object trees from XML documents. DocumentBuilderFactory crunchifyDocBuilderFactory = DocumentBuilderFactory . newInstance ( ) ; // Defines the API to obtain DOM Document instances from an XML document. DocumentBuilder crunchifyDocBuilder ; try { crunchifyDocBuilder = crunchifyDocBuilderFactory . newDocumentBuilder ( ) ; // The Document interface represents the entire HTML or XML document. Document crunchifyDoc = crunchifyDocBuilder . newDocument ( ) ; // The Element interface represents an element in an HTML or XML document. Element mainRootElement = crunchifyDoc . createElementNS ( "https://crunchify.com/CrunchifyCreateXMLDOM" , "Companies" ) ; // Adds the node newChild to the end of the list of children of this node. // If the newChild is already in the tree, it is first removed. crunchifyDoc . appendChild ( mainRootElement ) ; // append child elements to root element mainRootElement . appendChild ( getCompany ( crunchifyDoc , "1" , "Paypal" , "Payment" , "1000" ) ) ; mainRootElement . appendChild ( getCompany ( crunchifyDoc , "2" , "Amazon" , "Shopping" , "2000" ) ) ; mainRootElement . appendChild ( getCompany ( crunchifyDoc , "3" , "Google" , "Search" , "3000" ) ) ; mainRootElement . appendChild ( getCompany ( crunchifyDoc , "4" , "Crunchify" , "Java Tutorials" , "10" ) ) ; // output DOM XML to console // An instance of this abstract class can transform a source tree into a result tree. Transformer crunchifyTransformer = TransformerFactory . newInstance ( ) . newTransformer ( ) ; crunchifyTransformer . setOutputProperty ( OutputKeys . INDENT , "yes" ) ; // Acts as a holder for a transformation Source tree in the form of a Document Object Model (DOM) tree. DOMSource source = new DOMSource ( crunchifyDoc ) ; // Acts as an holder for a transformation result, which may be XML, plain Text, HTML, or some other form of markup. StreamResult console = new StreamResult ( System . out ) ; crunchifyTransformer . transform ( source , console ) ; System . out . println ( "\nTutorial by Crunchify. XML DOM Created Successfully.." ) ; } catch ( TransformerException | ParserConfigurationException e ) { e . printStackTrace ( ) ; } } // The Node interface is the primary datatype for the entire Document Object Model. // It represents a single node in the document tree. private static Node getCompany ( Document doc , String id , String name , String age , String role ) { Element crunchifyCompany = doc . createElement ( "Company" ) ; crunchifyCompany . setAttribute ( "id" , id ) ; crunchifyCompany . appendChild ( getCrunchifyCompanyElements ( doc , crunchifyCompany , "Name" , name ) ) ; crunchifyCompany . appendChild ( getCrunchifyCompanyElements ( doc , crunchifyCompany , "Type" , age ) ) ; crunchifyCompany . appendChild ( getCrunchifyCompanyElements ( doc , crunchifyCompany , "Employees" , role ) ) ; return crunchifyCompany ; } // Utility method to create text node private static Node getCrunchifyCompanyElements ( Document doc , Element element , String name , String value ) { Element node = doc . createElement ( name ) ; node . appendChild ( doc . createTextNode ( value ) ) ; return node ; } } |
文档生成器工厂:
定义一个工厂 API,使应用程序能够获得一个解析器,该解析器从 XML 文档生成 DOM 对象树。

文档生成器:
定义 API 以从 XML 文档中获取 DOM 文档实例。
附加孩子():
将节点 newChild 添加到该节点的子节点列表的末尾。 如果 newChild 已经在树中,则首先将其移除。
变压器:
此抽象类的实例可以将源树转换为结果树。
DOM来源:
充当文档对象模型 (DOM) 树形式的转换源树的持有者。
流结果:
充当转换结果的持有者,它可能是 XML、纯文本、HTML 或某种其他形式的标记。
-
The Node
接口是整个文档对象模型的主要数据类型。 它表示文档树中的单个节点。 -
The Document
接口代表整个 HTML 或 XML 文档。 -
The Element
Java 接口表示 HTML 或 XML 文档中的元素。
Eclipse 控制台输出:
将上述程序作为 Java 应用程序运行以获得类似的结果,如下所示。
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<? xml version = "1.0" encoding = "UTF-8" standalone = "no" ?> < Companies xmlns = "https://crunchify.com/CrunchifyCreateXMLDOM" > < Company id = "1" > < Name > Paypal < / Name > < Type > Payment < / Type > < Employees > 1000 < / Employees > < / Company > < Company id = "2" > < Name > Amazon < / Name > < Type > Shopping < / Type > < Employees > 2000 < / Employees > < / Company > < Company id = "3" > < Name > Google < / Name > < Type > Search < / Type > < Employees > 3000 < / Employees > < / Company > < Company id = "4" > < Name > Crunchify < / Name > < Type > Java Tutorials < / Type > < Employees > 10 < / Employees > < / Company > < / Companies > Tutorial by Crunchify . XML DOM Created Successfully . . Process finished with exit code 0 |