Java 操縱XML之修改XML文件

一、JAVA DOM PARSER

DOM interfaces
　　The DOM defines several Java interfaces. Here are the most common interfaces:
　　　　Node - The base datatype of the DOM.
　　　　Element - The vast majority of the objects you'll deal with are Elements.
　　　　Attr Represents an attribute of an element.
　　　　Text The actual content of an Element or Attr.
　　　　Document Represents the entire XML document. A Document object is often referred to as?a DOM tree.
Common DOM methods
　　When you are working with the DOM, there are several methods you'll use often:
　　　　Document.getDocumentElement() - Returns the root element of the document.
　　　　Node.getFirstChild() - Returns the first child of a given Node.
　　　　Node.getLastChild() - Returns the last child of a given Node.
　　　　Node.getNextSibling() - These methods return the next sibling of a given Node.
　　　　Node.getPreviousSibling() - These methods return the previous sibling of a given Node.
　　　　Node.getAttribute(attrName) - For a given Node, returns the attribute with the requested?name.

二、源代碼：ModifyXmlFile.java

1 package cn.com.zfc.lesson26.xml; 2 3 import java.io.File; 4 5 import javax.xml.parsers.DocumentBuilder; 6 import javax.xml.parsers.DocumentBuilderFactory; 7 import javax.xml.transform.Transformer; 8 import javax.xml.transform.TransformerFactory; 9 import javax.xml.transform.dom.DOMSource; 10 import javax.xml.transform.stream.StreamResult; 11 12 import org.w3c.dom.Document; 13 import org.w3c.dom.Element; 14 import org.w3c.dom.NamedNodeMap; 15 import org.w3c.dom.Node; 16 17 /** 18 * 使用JAVA DOM PARSER：修改 XML 文件 19 * 20 * @author zfc 21 * @date 2017年12月7日 下午8:31:55 22 */ 23 public class ModifyXmlFile { 24 public static void main(String[] args) { 25 try { 26 String filePath = "I:\\code_workspace\\JavaSE_workspace\\JavaSE\\src\\cn\\com\\zfc\\lesson26\\xml\\ModifyXmlFile.xml"; 27 // 1、創(chuàng)建 File 對(duì)象，映射 XML 文件 28 File file = new File(filePath); 29 // 2、創(chuàng)建 DocumentBuilderFactory 對(duì)象，用來(lái)創(chuàng)建 DocumentBuilder 對(duì)象 30 DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); 31 // 3、創(chuàng)建 DocumentBuilder 對(duì)象，用來(lái)將 XML 文件 轉(zhuǎn)化為 Document 對(duì)象 32 DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); 33 // 4、創(chuàng)建 Document 對(duì)象，解析 XML 文件 34 Document document = documentBuilder.parse(file); 35 // 修改第一個(gè) student 36 // 5、獲取第一個(gè) student 結(jié)點(diǎn) 37 Node student = document.getElementsByTagName("student").item(0); 38 // 獲取結(jié)點(diǎn) student 結(jié)點(diǎn)的所有屬性 39 NamedNodeMap namedNodeMap = student.getAttributes(); 40 // 獲取界定 student 的 屬性 id 41 Node id = namedNodeMap.getNamedItem("id"); 42 // 給屬性 id 重新設(shè)置值 43 id.setTextContent("student11"); 44 // 6、獲取根結(jié)點(diǎn) students 的第一個(gè)直接子結(jié)點(diǎn) student 45 student = document.getElementsByTagName("student").item(0); 46 Element studentElement = (Element) student; 47 // 7、獲取結(jié)點(diǎn) student 的直接子結(jié)點(diǎn) name、sex 48 Node name = studentElement.getElementsByTagName("name").item(0); 49 Node sex = studentElement.getElementsByTagName("sex").item(0); 50 Element nameElement = (Element) name; 51 Element sexElement = (Element) sex; 52 // 8、給節(jié)點(diǎn)進(jìn)行設(shè)置值 53 nameElement.setTextContent("TomTom"); 54 sexElement.setTextContent("FemaleFemale"); 55 // 9、創(chuàng)建 TransformerFactory 對(duì)象 56 TransformerFactory transformerFactory = TransformerFactory.newInstance(); 57 // 10、創(chuàng)建 Transformer 對(duì)象 58 Transformer transformer = transformerFactory.newTransformer(); 59 // 11、創(chuàng)建 DOMSource 對(duì)象 60 DOMSource domSource = new DOMSource(document); 61 // 12、創(chuàng)建 StreamResult 對(duì)象 62 StreamResult reStreamResult = new StreamResult(file); 63 transformer.transform(domSource, reStreamResult); 64 65 // 輸出測(cè)試結(jié)果 66 StreamResult consoleResult = new StreamResult(System.out); 67 transformer.transform(domSource, consoleResult); 68 69 } catch (Exception e) { 70 e.printStackTrace(); 71 } 72 } 73 }

ModifyXmlFile.xml

1 <?xml version="1.0" encoding="UTF-8" standalone="no"?> 2 <students> 3 <student id="student1"> 4 <name>Tom</name> 5 <sex>Female</sex> 6 </student> 7 <student id="student2"> 8 <name>Lucy</name> 9 <sex>Male</sex> 10 </student> 11 </students>

三、運(yùn)行效果：

1 <?xml version="1.0" encoding="UTF-8" standalone="no"?><students> 2 <student id="student11"> 3 <name>TomTom</name> 4 <sex>FemaleFemale</sex> 5 </student> 6 <student id="student2"> 7 <name>Lucy</name> 8 <sex>Male</sex> 9 </student> 10 </students>

轉(zhuǎn)載于:https://www.cnblogs.com/zfc-java/p/8001212.html

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