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>