如何将新节点附加到现有xml文件

Hello Im new in useing xml and now trying to append new nodes for existing xml file.

你好我是新的使用xml,现在尝试为现有的xml文件追加新的节点。

This is my code to write a xml

这是我写一个xml的代码

DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBulder = docFactory.newDocumentBuilder();

                //root mainElement
                Document doc = docBulder.newDocument();
                Element rootElement = doc.createElement("Books");
                doc.appendChild(rootElement);

                //root Book
                Element Book = doc.createElement("Book");
                rootElement.appendChild(Book);

                //setting ganre for a book
                Attr att = doc.createAttribute("ganre");
                att.setValue(ganre);
                Book.setAttributeNode(att);

                //book id
                Element bookId = doc.createElement("bookId");
                bookId.appendChild(doc.createTextNode(randomString(4)));
                Book.appendChild(bookId);

                //bookname element
                Element bookname = doc.createElement("bookName");
                bookname.appendChild(doc.createTextNode(name));
                Book.appendChild(bookname);

                //book author
                Element bookAuthor = doc.createElement("bookAuthor");
                bookAuthor.appendChild(doc.createTextNode(author));
                Book.appendChild(bookAuthor);

                //book year
                Element bookYear = doc.createElement("bookYear");
                bookYear.appendChild(doc.createTextNode(String.valueOf(year)));
                Book.appendChild(bookYear);

                //book available
                Element bookAvail = doc.createElement("bookAvailable");
                bookAvail.appendChild(doc.createTextNode(String.valueOf(free)));
                Book.appendChild(bookAvail);

                //write in a XMLFile
                TransformerFactory transformerFactory = TransformerFactory.newInstance();
                Transformer transformer = transformerFactory.newTransformer();
                DOMSource source = new DOMSource(doc);
                StreamResult result = new StreamResult(new File("Test/Books.xml"));

                transformer.transform(source, result);

                System.out.println("File saved!");

this is how I trying to append new nodes

这就是我尝试追加新节点的方法

     File fXmlFile = new File("Test/Books.xml");
     DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
                    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
                    Document doc = dBuilder.parse(fXmlFile);

                    Node books = doc.getFirstChild();


                    Element newBook = doc.createElement("Book");

[here the troubles comes]

what i want to do is rewrite file like this:

我想要做的是重写这样的文件:

    <Books>
    <Book ganre="fantasy">
    <bookId>7111</bookId>
    <bookName>Tron</bookName>
    <bookAuthor>Brawm</bookAuthor>
    <bookYear>15</bookYear>
    <bookAvailable>true</bookAvailable>
    </Book>

    <Book ganre="action">
    <bookId>312</bookId>
    <bookName>Corn</bookName>
    <bookAuthor>Down</bookAuthor>
    <bookYear>23</bookYear>
    <bookAvailable>false</bookAvailable>
    </Book>
    </Books>

but every time Im can only rewrite or damage the xml file. ps Im getting all my bookName's and so on from the input

但每次我只能重写或损坏xml文件。 ps我从输入中得到我所有的bookName等等

2 个解决方案

#1

I can just suggest to use the JDom library. Its very easy to use and implement, always worked for me.

我可以建议使用JDom库。它非常易于使用和实施,总是为我工作。

JDOM is, quite simply, a Java representation of an XML document. JDOM provides a way to represent that document for easy and efficient reading, manipulation, and writing. It has a straightforward API, is a lightweight and fast, and is optimized for the Java programmer. It’s an alternative to DOM and SAX, although it integrates well with both DOM and SAX.

简而言之,JDOM是XML文档的Java表示。 JDOM提供了一种表示该文档的方法,以便于阅读,操作和编写。它有一个简单的API,轻量级,快速,并针对Java程序员进行了优化。它是DOM和SAX的替代品,尽管它与DOM和SAX都很好地集成。

There are some good tutorials at mykong.com explaining how to read, modify and create xml-files :

mykong.com上有一些很好的教程,解释了如何阅读,修改和创建xml文件:

http://www.mkyong.com/java/how-to-modify-xml-file-in-java-jdom/

#2

problem was solved. My solution is:

问题解决了。我的解决方案是:

                File fXmlFile = new File("Test/Books.xml");
                DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
                DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
                Document doc = dBuilder.parse(fXmlFile);

//                doc.getDocumentElement().normalize();

                Element nList = doc.getDocumentElement();

                System.out.println("-----------------------");

                //root a new book
                Element newBook = doc.createElement("Book");

                //setting ganre for a book
                Attr att = doc.createAttribute("ganre");
                att.setValue(ganre);
                newBook.setAttributeNode(att);

                //book id
                Element bookId = doc.createElement("bookId");
                bookId.appendChild(doc.createTextNode(randomString(4)));
                newBook.appendChild(bookId);

                //bookname element
                Element bookname = doc.createElement("bookName");
                bookname.appendChild(doc.createTextNode(name));
                newBook.appendChild(bookname);

                //book author
                Element bookAuthor = doc.createElement("bookAuthor");
                bookAuthor.appendChild(doc.createTextNode(author));
                newBook.appendChild(bookAuthor);

                //book year
                Element bookYear = doc.createElement("bookYear");
                bookYear.appendChild(doc.createTextNode(String.valueOf(year)));
                newBook.appendChild(bookYear);

                //book available
                Element bookAvail = doc.createElement("bookAvailable");
                bookAvail.appendChild(doc.createTextNode(String.valueOf(free)));
                newBook.appendChild(bookAvail);

                nList.appendChild(newBook);

                Transformer transformer = TransformerFactory.newInstance().newTransformer();
                transformer.setOutputProperty(OutputKeys.INDENT, "yes");

                //initialize StreamResult with File object to save to file
                StreamResult result = new StreamResult(new File("Test/Books.xml"));
                DOMSource source = new DOMSource(doc);
                transformer.transform(source, result);
                System.out.println("DONE");