解析

1.引入依賴

<!-- dom4j -->
<dependency>
  <groupId>org.dom4j</groupId>
  <artifactId>dom4j</artifactId>
  <version>2.1.0</version>
</dependency>

2.需要解析的xml檔案

<?xml version="1.0" encoding="UTF-8"?>
<books>
    <book id="imooc-001" category="歷史">
        <name>三國演義</name>
        <author>羅貫中</author>
        <price>1030</price>
    </book>
    <book id="imooc-002" category="程式設計">
        <name>Oracle開發實戰經典</name>
        <author>李興華</author>
        <price>60</price>
    </book>
</books>
 

3.該xml檔案所對應的JavaBean

public class Book {
    private String id;
    private String category;
    private String name;
    private String author;
    private int price;
    //get和set方法
}

4.編寫讀取Dom物件的工具類Dom4jReaderUtils

public class Dom4jReaderUtils {
    public static Document getDocument() {
        String resource = "/Volumes/TOSHIBA EXT/1.學習/程式碼/6.SSM/springmvc/springMVC_demo/src/main/resources/file/books.xml";
        Document document = null;
        SAXReader reader = new SAXReader();
        try {
            document = reader.read(new File(resource));
        } catch (DocumentException e) {
            e.printStackTrace();
        }
        return document;
    }
}
 

5.編寫寫入DOM物件的工具類Dom4jWriterUtils

//編寫寫入DOM物件的工具類Dom4jWriterUtils
public class Dom4jWriterUtils {
    public static void writeDom(Document document) throws IOException {
        //建立檔案輸出的時候，自動縮排的格式
        OutputFormat format = OutputFormat.createPrettyPrint();
        XMLWriter writer = null;
        try {
            //設定編碼
            format.setEncoding("UTF-8");
            //建立XMLWriter物件的時候,為防止亂碼最好傳入FileOutStream作為引數
            writer = new XMLWriter(new FileOutputStream(new File("/Volumes/TOSHIBA EXT/1.學習/程式碼/6.SSM/springmvc/springMVC_demo/src/main/resources/file/Mapper.xml")), format);
            writer.write(document);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
 

6.編寫Dom4jCRUD實現對books.xml進行讀取並進行測試

public class Dom4jCURD {
    public static void main(String[] args) {
        //讀取books檔案中的內容
        Document document = Dom4jReaderUtils.getDocument();
        List<Book> bookList=getBookListFromXML(document);
        Iterator<Book> iterator = bookList.iterator();
        while(iterator.hasNext()){
            Book book = iterator.next();
            System.out.println("id:"+book.getId());
            System.out.println("category:"+book.getCategory());
            System.out.println("author:"+book.getAuthor());
            System.out.println("name:"+book.getName());
            System.out.println("price:"+book.getPrice());
        }
    }
    /**
     * 讀取xml檔案中所有的book子節點並將其封裝成Book物件放在List中返回。
     * @param document XML文件物件
     * @return 存放Book物件的List
     */
    public static List<Book> getBookListFromXML(Document document) {
        List<Book> bookList = new ArrayList<Book>();
        Element root = document.getRootElement();
        Iterator<Element> bookIterator = root.elementIterator();
        while (bookIterator.hasNext()) {
            Element element = bookIterator.next();
            Book book = new Book();
            book.setName(element.elementText("name"));
            book.setPrice(Integer.parseInt(element.elementText("price")));
            book.setAuthor(element.elementText("author"));
            Iterator<Attribute> bookAttr = element.attributeIterator();
            while (bookAttr.hasNext()) {
                Attribute attribute = bookAttr.next();
                String attributeName = attribute.getName();
                if (attributeName.equals("id")) {
                    book.setId(attribute.getValue());
                } else {
                    book.setCategory(attribute.getValue());
                }
            }
            bookList.add(book);
        }
        return bookList;
    }
}

生成

1.引入依賴

<!-- dom4j -->
<dependency>
  <groupId>org.dom4j</groupId>
  <artifactId>dom4j</artifactId>
  <version>2.1.0</version>
</dependency>

2.編寫生成xml檔案內容的程式碼

class Dom4JTest {

    public static void main(String[] args) throws FileNotFoundException {
        createXMLFile();
    }

    /**
     *使用Dom4J建立一個新的XML文件
     */
    public static void createXMLFile() throws FileNotFoundException {
        //1.建立一個xml文件
        Document document = DocumentHelper.createDocument();
        //2.建立一個根元素，併為其設定屬性
        Element root = DocumentHelper.createElement("mapper");
        root.addAttribute("namespace","com.steven.ssm.mapper.ItemsMapperCustom");
        //3.為根元素建立子節點，並設定屬性和值
        document.setRootElement(root);
        Element select = DocumentHelper.createElement("select");
        select.addAttribute("id","getItemsList").addAttribute("resultMap","queryItems").addText("select *  from items");
        root.add(select);
        Element resultMap = DocumentHelper.createElement("resultMap");
        resultMap.addAttribute("id","queryItems").addAttribute("type","items");
        root.add(resultMap);
        
        Element id = resultMap.addElement("id");
        id.addAttribute("column","item_id").addAttribute("property","itemId");
        Element itemName = resultMap.addElement("itemName");
        itemName.addAttribute("column","item_name").addAttribute("property","itemName");

        //4.將文件內容寫入指定的xml檔案中
        Dom4jWriterUtils.writeDom(document);
    }
}

3.生成的xml檔案

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

<mapper namespace="com.steven.ssm.mapper.ItemsMapperCustom">
  <select id="getItemsList" resultMap="queryItems">select * from items</select>
  <resultMap id="queryItems" type="items">
    <id column="item_id" property="itemId"/>
    <itemName column="item_name" property="itemName"/>
  </resultMap>
</mapper>