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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After a dramatic start to the year, the crypto industry is settling into a new reality — one in which the White House is laying out the red carpet and promising an unprecedented level of support.
Crypto, a roughly 15-year-old industry that’s largely operated on the fringes of finance, is at a crossroads. For years, it has blamed a hostile regulatory environment for not allowing it to unleash its supposedly revolutionary technology on Americans. Now, though, their favorite bogeyman, Gary Gensler, the Securities and Exchange Commission chief under President Joe Biden, is gone. Crypto cheerleaders have been installed throughout the government.
The SEC has dropped several enforcement cases against crypto companies and, starting Friday, is hosting a series of public roundtables “to discuss key areas of interest in the regulation of crypto assets.”
Under President Donald Trump, there’s virtually nothing stopping crypto companies from creating and selling their products.
At the same time, the same White House’s chaotic trade policy is undermining financial markets’ appetite for risk, leaving bitcoin in limbo, more than 20% off from its record high in January. And while the industry is grateful for all the attention, the White House’s embrace of some of crypto’s less savory aspects, like meme coins, has given serious investors pause.
Given the enormous potential for the $3 trillion industry in this moment, I checked in with Eswar Prasad, a Cornell University professor of international trade and the author of the 2021 book “The Future of Money,” about the forces disrupting financial technologies.
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The following interview has been edited for length and clarity.
Nightcap: We just saw a pretty wild thing happen with the crypto summit — hard to imagine a scenario like that taking place under any previous administration. What were your takeaways?
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And I think we saw many of the major players in the crypto industry essentially using the opportunity to not just thank Trump, but try to make the point, which seemed to resonate with Trump, that this industry can power, in some sense, a resurgence of a certain part of the US economy.
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