java 生成xml并转为字符串的方法

如下所示：

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.commons.io.output.ByteArrayOutputStream;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class test {

private String createXml() {
String xmlString = "";

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.newDocument();
document.setXmlStandalone(true);

Element itemInfo = document.createElement("ItemInfo");
document.appendChild(itemInfo);

Element itemStatistics = document.createElement("ItemStatistics");
itemStatistics.setTextContent("商品统计");
itemInfo.appendChild(itemStatistics);

Element items = document.createElement("Items");
itemInfo.appendChild(items);
// 此处可以循环添加
Element item = document.createElement("Item");
items.appendChild(item);

Element itemName = document.createElement("ItemName");
itemName.setTextContent("iPhone");
item.appendChild(itemName);

Element itemNum = document.createElement("ItemNum");
itemNum.setTextContent("3");
item.appendChild(itemNum);

Element itemValue = document.createElement("ItemValue");
itemValue.setTextContent("1000000");
item.appendChild(itemValue);

Element remark = document.createElement("Remark");
remark.setTextContent("配送");
itemInfo.appendChild(remark);

TransformerFactory transFactory = TransformerFactory.newInstance();
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
DOMSource domSource = new DOMSource(document);

// xml transform String
ByteArrayOutputStream bos = new ByteArrayOutputStream();
transformer.transform(domSource, new StreamResult(bos));
xmlString = bos.toString();
System.out.println(xmlString);
} catch (Exception e) {
e.printStackTrace();
}

return xmlString;
}
}

结果：

<?xml version="1.0" encoding="UTF-8"?>
<ItemInfo>
<ItemStatistics>商品统计</ItemStatistics>
<Items>
<Item>
<ItemName>iPhone</ItemName>
<ItemNum>3</ItemNum>
<ItemValue>1000000</ItemValue>
</Item>
</Items>
<Remark>配送</Remark>
</ItemInfo>

去掉头文件

<?xml version="1.0" encoding="utf-8"?>

的办法暂时只能想到：

xmlString.substring(38)

来源：https://blog.csdn.net/cat_book_milk/article/details/52954637