Java針對XML檔案的操作大集合
XML是工作上常用到的資料交換格式,會需要利用JAVA進行XML資料的新增、修改或刪除,這裡把相關的方法記錄下來。
下述範例會存取在C:\Projects\Javas\中的sample.xml檔,而檔案中已經有以下的內容:
<?xml version="1.0" encoding="utf-8"?> <root> <item> <productID>10001</productID> <productName>產品名稱1</productName> <productPrice>10</productPrice> </item> <item> <productID>10002</productID> <productName>產品名稱2</productName> <productPrice>20</productPrice> </item> <item> <productID>10003</productID> <productName>產品名稱3</productName> <productPrice>30</productPrice> </item> </root>
利用Java存取XML我選用的Library是dom4j,可參考官網的介紹,以下是JAVA存取的程式範例:
package CDIT.stanley; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.Iterator; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.SAXReader; public class dom4jXMLFullSample { //新增XML Node內容 public static String XMLAppendNode(String xmlFilePath, String productID, String productName, String productPrice){ String appendStatus = "0"; try { SAXReader reader = new SAXReader(); Document document = reader.read(xmlFilePath); Element root = document.getRootElement(); Element item = root.addElement("item"); item.addElement("productID").setText(productID); item.addElement("productName").setText(productName); item.addElement("productPrice").setText(productPrice); OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("utf-8"); XMLWriter writer = new XMLWriter(new FileOutputStream(xmlFilePath),format); writer.write(document); writer.close(); appendStatus = "1"; } catch (DocumentException e) { return appendStatus; } catch (UnsupportedEncodingException e) { return appendStatus; } catch (FileNotFoundException e) { return appendStatus; } catch (IOException e) { return appendStatus; } return appendStatus; } //修改XML Node內容 public static String XMLChangeNodeValue(String xmlFilePath, String productID, String productName, String productPrice){ String updateStatus = "0"; try { SAXReader reader = new SAXReader(); Document document = reader.read(xmlFilePath); Element root = document.getRootElement(); @SuppressWarnings("rawtypes") Iterator it = root.elementIterator(); while (it.hasNext()) { Element element = (Element) it.next(); if(productID.equals(element.elementText("productID"))){ try { element.element("productName").setText(productName); element.element("productPrice").setText(productPrice); OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("utf-8"); XMLWriter writer = new XMLWriter(new FileOutputStream(xmlFilePath),format); writer.write(document); writer.close(); updateStatus = "1"; } catch (IOException e) { return updateStatus; } } } return updateStatus; } catch (DocumentException e) { return updateStatus; } } //刪除XML Node public static String XMLRemoveNode(String xmlFilePath , String productID){ String removeStatus = "0"; try { SAXReader reader = new SAXReader(); Document document = reader.read(xmlFilePath); Element root = document.getRootElement(); @SuppressWarnings("rawtypes") Iterator it = root.elementIterator(); while (it.hasNext()) { Element element = (Element) it.next(); if(productID.equals(element.elementText("productID"))){ try { element.element("item"); element.detach(); OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("utf-8"); XMLWriter writer = new XMLWriter(new FileOutputStream(xmlFilePath),format); writer.write(document); writer.close(); removeStatus = "1"; } catch (IOException e) { return removeStatus; } } } return removeStatus; } catch (DocumentException e) { return removeStatus; } } public static void main (String[] args){ String xmlFilePath = "C:\\Projects\\Javas\\sample.xml"; //新增 XMLAppendNode(xmlFilePath , "10004", "產品名稱4", "40"); //修改 XMLChangeNodeValue (xmlFilePath , "10001", "測試修改", "100"); //刪除 XMLRemoveNode (xmlFilePath , "10002"); } }
上述程式進行完後,會將原本的XML檔變成如下的內容:
<?xml version="1.0" encoding="utf-8"?> <root> <item> <productID>10001</productID> <productName>測試修改</productName> <productPrice>100</productPrice> </item> <item> <productID>10003</productID> <productName>產品名稱3</productName> <productPrice>30</productPrice> </item> <item> <productID>10004</productID> <productName>產品名稱4</productName> <productPrice>40</productPrice> </item> </root>
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