java使用jdom向现有xml添加内容

Question

package xml.dierenshop.flaming.v1;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.output.XMLOutputter;
import org.jdom2.output.Format;
import java.io.FileWriter;
import java.io.IOException;

public class Writer {

    public void Writer(String categorie, String code, String naamartikel, String beschrijvingartikel, double prijz, String imgurl, String imgurl2, String imgurl3, String imgurl4, String imgurl5) {
        String prijs = String.valueOf(prijz);
        Document document = new Document();
        Element root = new Element("productlist");
        String naamelement = "naam";
        String categorieelement = "category";
        String descriptionelement = "description";
        Element child = new Element("product");
        child.addContent(new Element(categorieelement).setText(categorie));
        child.addContent(new Element("code").setText(code));
        child.addContent(new Element(naamelement).setText(naamartikel));
        child.addContent(new Element(descriptionelement).setText(beschrijvingartikel));
        child.addContent(new Element("price").setText(prijs));
        child.addContent(new Element("image").setText(imgurl));
        child.addContent(new Element("image").setText(imgurl2));
        child.addContent(new Element("image").setText(imgurl3));
        child.addContent(new Element("image").setText(imgurl4));
        child.addContent(new Element("image").setText(imgurl5));
        root.addContent(child);
        document.setContent(root);
        try {
            FileWriter writer = new FileWriter("products.xml");
            XMLOutputter outputter = new XMLOutputter();
            outputter.setFormat(Format.getPrettyFormat());
            outputter.output(document, writer);
            outputter.output(document, System.out);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这是我的类，用于使用主类中的变量编写xml文件。 这里的输出是：

http://pastebin.com/nFtiv2b8

现在我有一个问题，下次运行这个java应用程序时，我希望它添加一个新产品，但保留旧产品。但是，每次我尝试此操作时，它都会用新数据替换旧数据

Answer 1

用替换root=document.getRootElement();

root = document.detachRootElement();

因为一个元素只能与jdom中的一个文档关联

Answer 2

基本上，您需要加载一个现有的xml文件，并通过解析它并从中获取根元素来对其进行Document。如果文件不存在，则创建一个新文档和一个新的根元素。之后，您可以继续使用显示的代码

创建一个类Product来保存产品数据。将产品数据作为参数传递给方法是不可能的

Product类（为了简单起见，所有字段都是公共的，这不是一个好的实践，您至少应该使它们受到保护，并且对于每个字段都有一个getter和setter方法）

public class Product {
    public String categorie;
    public String code;
    public String naamartikel;
    public String beschrijvingartikel;
    public double prijz;
    public String imgurl;
    public String imgurl2;
    public String imgurl3; 
    public String imgurl4;
    public String imgurl5;
}

书写方法

public static void Writer(Product product) throws JDOMException, IOException {

    Document document = null;
    Element root = null;

    File xmlFile = new File("products.xml");
    if(xmlFile.exists()) {
        // try to load document from xml file if it exist
        // create a file input stream
        FileInputStream fis = new FileInputStream(xmlFile);
        // create a sax builder to parse the document
        SAXBuilder sb = new SAXBuilder();
        // parse the xml content provided by the file input stream and create a Document object
        document = sb.build(fis);
        // get the root element of the document
        root = document.getRootElement();
        fis.close();
    } else {
        // if it does not exist create a new document and new root
        document = new Document();
        root = new Element("productlist");
    }


    String prijs = String.valueOf(product.prijz);
    String naamelement = "naam";
    String categorieelement = "category";
    String descriptionelement = "description";
    Element child = new Element("product");
    child.addContent(new Element(categorieelement).setText(product.categorie));
    child.addContent(new Element("code").setText(product.code));
    child.addContent(new Element(naamelement).setText(product.naamartikel));
    child.addContent(new Element(descriptionelement).setText(product.beschrijvingartikel));
    child.addContent(new Element("price").setText(prijs));
    child.addContent(new Element("image").setText(product.imgurl));
    child.addContent(new Element("image").setText(product.imgurl2));
    child.addContent(new Element("image").setText(product.imgurl3));
    child.addContent(new Element("image").setText(product.imgurl4));
    child.addContent(new Element("image").setText(product.imgurl5));
    root.addContent(child);
    document.setContent(root);
    try {
        FileWriter writer = new FileWriter("products.xml");
        XMLOutputter outputter = new XMLOutputter();
        outputter.setFormat(Format.getPrettyFormat());
        outputter.output(document, writer);
        outputter.output(document, System.out);
        writer.close(); // close writer
    } catch (IOException e) {
        e.printStackTrace();
    }
}

最后是一个小测试

public static void main(String[] args) throws JDOMException, IOException {
    Product product = null;

    product = new Product();
    product.categorie = "cat1";
    product.code = "code1";
    product.naamartikel = "naam1";
    product.beschrijvingartikel = "beschrijving1";
    product.prijz = 100d;
    product.imgurl = "http://localhost/img1.png";
    product.imgurl2 = "http://localhost/img2.png";
    product.imgurl3 = "http://localhost/img3.png";
    product.imgurl4 = "http://localhost/img5.png";
    product.imgurl5 = "http://localhost/img5.png";
    Writer(product);

    product = new Product();
    product.categorie = "cat2";
    product.code = "code2";
    product.naamartikel = "naam2";
    product.beschrijvingartikel = "beschrijving2";
    product.prijz = 200d;
    product.imgurl = "http://localhost/img21.png";
    product.imgurl2 = "http://localhost/img22.png";
    product.imgurl3 = "http://localhost/img23.png";
    product.imgurl4 = "http://localhost/img25.png";
    product.imgurl5 = "http://localhost/img25.png";
    Writer(product);

    product = new Product();
    product.categorie = "cat3";
    product.code = "code3";
    product.naamartikel = "naam3";
    product.beschrijvingartikel = "beschrijving3";
    product.prijz = 300d;
    product.imgurl = "http://localhost/img31.png";
    product.imgurl2 = "http://localhost/img32.png";
    product.imgurl3 = "http://localhost/img33.png";
    product.imgurl4 = "http://localhost/img35.png";
    product.imgurl5 = "http://localhost/img35.png";
    Writer(product);
}

此外，文件名products.xml不应硬编码到java文件中；而是在运行程序时将其作为参数传递

Answer 3

在将根目录设置为文档使用的内容之前：

root = root.detach();

因为一个元素只能与jdom中的一个文档关联