<?xml version="1.0" encoding="UTF-8"?>
<books>
    <!--圖書(shū)信息  這是注釋-->
    <book id="bk101">
        <author>王珊</author>
        <title>.NET高級(jí)編程</title>
        <description>包含C#框架和網(wǎng)絡(luò)編程等</description>
    </book>
    <book id="bk102">
        <author>李明明</author>
        <title>XML基礎(chǔ)編程</title>
        <description>包含XML基礎(chǔ)概念和基本作用</description>
    </book>
</books>

<Users>
    <user id="1">
        <name>張三</name>
        <age>18</age>
        <address>廣州</address>
    </user>
    <userAttribute>都是愛(ài)學(xué)習(xí)的人</userAttribute>
    <user id="2">
        <name>李四</name>
        <age>25</age>
        <address>哈爾濱</address>
    </user>

    <!--以下是帶有大于號(hào)小于號(hào)等特殊字符的寫(xiě)法-->
    <special>
        <![CDATA[
            5 > 2 && 3 < 5
        ]]>

    </special>
    <!--特殊字符用法二-->
    <special>  5 &gt; 2 &amp;&amp; 3 &lt; 5 </special>
</Users>

<!ELEMENT 書(shū)架 (書(shū)+)>
<!ELEMENT 書(shū) (書(shū)名,作者,售價(jià))>
<!ELEMENT 書(shū)名 (#PCDATA)>
<!ELEMENT 作者 (#PCDATA)>
<!ELEMENT 售價(jià) (#PCDATA)>

<!DOCTYPE 書(shū)架 SYSTEM "data.dtd">

<?xml version="1.0" encoding="UTF-8"?>
<!-- 導(dǎo)入約束格式 -->
<!DOCTYPE 書(shū)架 SYSTEM "data.dtd">
<書(shū)架>
	<!-- 只能這么寫(xiě)否則報(bào)錯(cuò) -->
    <書(shū)>
        <書(shū)名>哈利波特</書(shū)名>
        <作者>J.K.羅琳</作者>
        <!-- 售價(jià)的類(lèi)型可以是浮點(diǎn)型，字符串，也可以是任何數(shù)據(jù)類(lèi)型 -->
        <售價(jià)>49.9</售價(jià)>
    </書(shū)>
    <書(shū)>
        <書(shū)名>西游記</書(shū)名>
        <作者>吳承恩</作者>
        <售價(jià)>49.9</售價(jià)>
    </書(shū)>
</書(shū)架>

<?xml version="1.0" encoding="UTF-8"?>
<!-- xmlns: 核心命名空間聲明 -->
<!-- xmlns="http://www.w3.org/2001/XMLSchema：
聲明使用W3C XML Schema規(guī)范作為默認(rèn)命名空間，所有未加前綴的標(biāo)簽均屬于該規(guī)范。 -->
<!-- targetNamespace(目標(biāo)命名空間): 申明約束文檔的地址(命名空間) 這里的data.xsd也是被約束的 -->
<!-- elementFormDefault(元素命名空間規(guī)則): 先不用管,這是關(guān)于局部元素的命名空間歸屬的屬性-->
<schema xmlns="http://www.w3.org/2001/XMLSchema"
        targetNamespace="http://www.itcast.cn"
        elementFormDefault="qualified" >
<!--全局元素定義,作為根元素，該元素直接屬于targetNamespace命名空間-->
    <element name="書(shū)架">
        <complexType>
            <!-- maxOccurs="unbounded" 書(shū)架下的子元素可以有無(wú)窮多個(gè) -->
            <sequence maxOccurs="unbounded">
                <element name="書(shū)">
                    <!--  寫(xiě)子元素  -->
                    <complexType>
                        <sequence>
                            <element name="書(shū)名" type="string"/>
                            <element name="作者" type="string"/>
                            <element name="價(jià)格" type="double"/>
                        </sequence>
                    </complexType>
                </element>
            </sequence>
        </complexType>
    </element>
</schema>

<?xml version="1.0" encoding="UTF-8"?>
<batchCompany xmlns="http://www.Aptech_edu.ac"
    xmlns:tea="http://www.tea.org">
    <batch-list>
   	 	<!-- 下面這個(gè)命名空間屬于xmlns:tea="http://www.Aptech_edu.ac" -->
        <batch type="thirdbatch">第三批次</batch>
        <!-- 下面這個(gè)命名空間屬于xmlns:tea="http://www.tea.org" -->
        <batch tea:type="thirdbatch">第三批茶</batch>
        <!-- 下面這個(gè)命名空間屬于xmlns:tea="http://www.Aptech_edu.ac" -->
        <batch>午班批次</batch>
    </batch-list>
</batchCompany>

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

<!-- 兩個(gè)廠家(佳能相機(jī)和尼康相機(jī))的地址 -->
<cameras xmlns:canon="http://www.canon"
    xmlns:nikon="http://www.nikon.com">
    <!-- 雖然都是相機(jī)camera  
    但是第一個(gè)是canon(佳能牌)的相機(jī) 
    第二個(gè)是nikon(尼康牌)的相機(jī) 
    -->
    <canon:camera prodID="P663" name="Camera傻瓜相機(jī)"/>
    <nikon:camera prodID=“K29B3” name=“Camera超級(jí)35毫米相機(jī)"/>
</cameras>

<?xml version="1.0" encoding="utf-8"?>
<PhoneInfo>
    <Brand name="華為">
        <Type name="U8650"/>
        <Type name="HW123"/>
        <Type name="HW321"/>
    </Brand>
    <Brand name="蘋(píng)果">
        <Type name="iPhone4"/>
    </Brand>
</PhoneInfo>

package com.hsh.exercise2;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

public class Main {
    public static void main(String[] args) throws Exception {
        // 創(chuàng)建解析器工廠對(duì)象
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        // 解析器工廠對(duì)象創(chuàng)建解析器對(duì)象
        DocumentBuilder db = factory.newDocumentBuilder();
        // 解析 XML 文件
        Document document = db.parse("./src/com/hsh/exercise2/phoneinfo.xml");

        // 獲取根元素
        Element root = document.getDocumentElement();
        // 獲取所有 Brand 元素
        NodeList brandList = root.getElementsByTagName("Brand");

        // 遍歷每個(gè) Brand 節(jié)點(diǎn)并打印 name 屬性
        for (int i = 0; i < brandList.getLength(); i++) {
            // 獲取 Brand 元素
            Element brand = (Element) brandList.item(i);
            // 獲取節(jié)點(diǎn)名稱(chēng)
            System.out.print(brand.getNodeName()+":  ");
            // 獲取 name 屬性
            System.out.print(brand.getAttribute("name")+"，");
            // 獲取節(jié)點(diǎn)文本內(nèi)容  由于是單標(biāo)簽所以為空。
            // System.out.println(brand.getTextContent());
            // 獲取Brand 元素下面的 Type 元素
            NodeList typeLists = brand.getElementsByTagName("Type");
            for (int j = 0; j < typeLists.getLength(); j++) {
                // 獲取 Type 元素
                Element type = (Element) typeLists.item(j);
                // 獲取節(jié)點(diǎn)名稱(chēng)
                System.out.print(type.getNodeName()+":  ");
                // 獲取 name 屬性
                System.out.print(type.getAttribute("name")+" ");
            }
            System.out.println();
        }
        // 輸出結(jié)果
        // Brand:  華為，Type:  U8650 Type:  HW123 Type:  HW321 
        // Brand:  蘋(píng)果，Type:  iPhone4
    }
}

package com.hsh.exercise3;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;

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

public class Main {
    public static void main(String[] args) throws Exception {
        //1. 創(chuàng)建工廠TransformerFactory對(duì)象
        TransformerFactory factory = TransformerFactory.newInstance();
        //2. 創(chuàng)建Transformer對(duì)象
        Transformer  transformer = factory.newTransformer();

        // 3. 創(chuàng)建Document對(duì)象來(lái)創(chuàng)建新的XML文件,給XML文件設(shè)置內(nèi)容，并將DOM結(jié)構(gòu)添加到DOMsource對(duì)象
        // 3.1 創(chuàng)建Document對(duì)象
        DocumentBuilderFactory documentFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder  builder = documentFactory.newDocumentBuilder();
        Document document = builder.newDocument();

        // 3.2 創(chuàng)建XML結(jié)構(gòu)（即給XML文件設(shè)置內(nèi)容）
        // 創(chuàng)建根元素
        Element root = document.createElement("root");
        // 加入到document中
        document.appendChild(root);
        // 創(chuàng)建子元素
        Element child = document.createElement("child");
        // 設(shè)置屬性名和屬性值
        child.setAttribute("name", "hsh");
        // 設(shè)置元素內(nèi)容
        child.appendChild(document.createTextNode("Text Content"));
        //加入根節(jié)點(diǎn)樹(shù)中
        root.appendChild(child);

        // 3.3 將文件添加到DOMsource對(duì)象中
        DOMSource source = new DOMSource(document);


        // 4. 給第二步 的Transformer對(duì)象設(shè)置輸出屬性
        // 4.1設(shè)置是否再XML中添加縮進(jìn)
        transformer.setOutputProperty(OutputKeys.INDENT,"yes");
        // 4.2指定輸出方法
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        // 4.3指定輸出文件編碼
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        // 5. 創(chuàng)建StreamResult對(duì)象，指定輸出文件 StreamResult對(duì)象包含了文件信息
        StreamResult result = new StreamResult("./src/com/hsh/exercise3/collection.xml");

        // 6. 將DOMsource對(duì)象和StreamResult對(duì)象作為參數(shù)傳遞給Transformer對(duì)象的transform方法進(jìn)行保存
        transformer.transform(source, result);
        System.out.println("保存成功！");
    }
}

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root>
    <child name="hsh">Text Content</child>
</root>

package com.hsh.exercise3;

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


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

public class Main {
    public static void main(String[] args) throws Exception {
        // 創(chuàng)建解析器工廠對(duì)象
        DocumentBuilderFactory  factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = factory.newDocumentBuilder();
        Document document = db.parse("./src/com/hsh/exercise3/收藏信息.xml");

        // 獲取根元素
        Element root = document.getDocumentElement();
        System.out.println(root.getNodeName());

        // 給根元素添加子元素Brand
        Element brand = document.createElement("Brand");
        brand.setAttribute("name","三星");
        // 給Brand 元素添加子元素Type
        Element type = document.createElement("Type");
        // 設(shè)置Type的屬性
        type.setAttribute("name","Note4");
        // 將Type添加到Brand中
        brand.appendChild(type);
        root.appendChild(brand);

        // 創(chuàng)建工廠進(jìn)行保存
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        // 設(shè)置格式化
        // 縮進(jìn)
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");

        // 指定輸出
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        // 指定編碼
        transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312");
        DOMSource domSource = new DOMSource(document);
        StreamResult streamResult = new StreamResult("./src/com/hsh/exercise3/收藏信息.xml");
        transformer.transform(domSource, streamResult);
        System.out.println("保存成功");
    }
}

<?xml version="1.0" encoding="GB2312"?>
<PhoneInfo>
    <Brand name="華為">
        <Type name="U8650"/>
        <Type name="HW123"/>  
        <Type name="HW321"/>
    </Brand>
    <Brand name="蘋(píng)果">   
        <Type name="iPhone4"/>
    </Brand>
    <Brand name="三星">         
        <Type name="Note4"/>  
    </Brand>
</PhoneInfo>

package com.hsh.exercise4;

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

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

public class Main {
    public static void main(String[] args) throws Exception {
        // 創(chuàng)建解析器工廠對(duì)象
        DocumentBuilderFactory  factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = factory.newDocumentBuilder();
        Document document = db.parse("./src/com/hsh/exercise4/收藏信息.xml");

        // 獲取根元素
        Element root = document.getDocumentElement();
        System.out.println(root.getNodeName());
        //  獲取root所有Brand子級(jí)標(biāo)簽
        NodeList nodeList = root.getElementsByTagName("Brand");
        for (int i = 0; i < nodeList.getLength(); i++) {
            // 給每一個(gè)Brand標(biāo)簽加屬性
            Element brand = (Element) nodeList.item(i);
            brand.setAttribute("id", (i+1)+"");
        }

        // 遍歷子級(jí)標(biāo)簽刪除 Brand的屬性為華為的標(biāo)簽
        for (int i = 0; i < nodeList.getLength(); i++) {
            Element brand = (Element) nodeList.item(i);
            if (brand.getAttribute("name").equals("華為")) {
                // 得到父元素
                Element parent = (Element) brand.getParentNode();
                // 刪除
                parent.removeChild(brand);
            }
        }
        
        // 創(chuàng)建工廠進(jìn)行保存
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        // 設(shè)置格式化
        // 縮進(jìn)
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");

        // 指定輸出
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        // 指定編碼
        transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312");
        DOMSource domSource = new DOMSource(document);
        StreamResult streamResult = new StreamResult("./src/com/hsh/exercise4/收藏信息.xml");
        transformer.transform(domSource, streamResult);
        System.out.println("保存成功");
    }
}

<?xml version="1.0" encoding="GB2312" standalone="no"?>
<PhoneInfo>
        
    
    <Brand id="2" name="蘋(píng)果">
                
        <Type name="iPhone4"/>
            
    </Brand>
        
    <Brand id="3" name="三星">
                
        <Type name="Note4"/>
            
    </Brand>
    
</PhoneInfo>

<?xml version="1.0" encoding="GB2312"?>
<PhoneInfo>
    <Brand name="華為">
        <Type name="U8650"/>
        <Type name="HW123"/>
        <Type name="HW321"/>
    </Brand>
    <Brand name="蘋(píng)果">
        <Type name="iPhone4"/>
    </Brand>
</PhoneInfo>

package com.hsh.exercise5;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.util.List;

public class Main {
    public static void main(String[] args) throws Exception {
//創(chuàng)建一個(gè)dom4j提供的解析器對(duì)象
        SAXReader saxReader = new SAXReader();
        //將xml文件讀取到我們的內(nèi)存當(dāng)中,獲取到這個(gè)Document 對(duì)象之后就可以讀取里面的數(shù)據(jù)了
        Document document = saxReader.read("./src/com/hsh/exercise5/收藏信息.xml");

        System.out.println("---獲取根元素---");
        //1、獲取根元素對(duì)象里面的所有信息，下面根據(jù)這個(gè)根元素對(duì)象去獲取想要的數(shù)據(jù)
        Element rootElement = document.getRootElement();
        System.out.println(rootElement.getName());// PhoneInfo

        System.out.println("---獲取所有一級(jí)子標(biāo)簽---");
        //2、獲取根元素里面的一級(jí)子元素
        List<Element> elements = rootElement.elements();
        for (Element element : elements){
            // 獲取標(biāo)簽名
            System.out.println(element.getName());
            // 獲取屬性值
            System.out.println(element.attributeValue("name"));
            // 獲取標(biāo)簽內(nèi)容 這是空，因?yàn)闆](méi)有設(shè)置內(nèi)容。
            System.out.println(element.getText());
        }
        // Brand
        // 華為
        // Brand
        // 蘋(píng)果
        System.out.println("---獲取所有一級(jí)子標(biāo)簽中的指定標(biāo)簽---");
        //獲取節(jié)點(diǎn)名稱(chēng)為books下所有子節(jié)點(diǎn)
        List<Element> Elist = rootElement.elements("Brand");
        for (Element element : Elist){
            System.out.println(element.getName());
        }
        // Brand
        // Brand
        System.out.println("---獲取一級(jí)子標(biāo)簽中的指定標(biāo)簽---");
        // 如果重復(fù)，則獲取第一個(gè)
        Element element = rootElement.element("Brand");
        System.out.println(element.getName());// Brand

    }
}

<?xml version="1.0" encoding="GB2312"?>
<PhoneInfo> 
  <Brand name="華為"> 
    <Type name="U8650"/>  
    <Type name="HW123"/>  
    <Type name="HW321"/> 
  </Brand>  
  <Brand name="蘋(píng)果"> 
    <Type name="iPhone4"/> 
  </Brand> 
</PhoneInfo>

package com.hsh.exercise5;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import java.io.FileWriter;
import java.util.List;

public class DelUpdXml {
    public static void main(String[] args) throws Exception {
        //創(chuàng)建一個(gè)dom4j提供的解析器對(duì)象
        SAXReader saxReader = new SAXReader();
        //將xml文件讀取到我們的內(nèi)存當(dāng)中,獲取到這個(gè)Document 對(duì)象之后就可以讀取里面的數(shù)據(jù)了
        Document document = saxReader.read("./src/com/hsh/exercise5/收藏信息.xml");
        // 獲取根元素對(duì)象
        Element rootElement = document.getRootElement();
        System.out.println(rootElement.getName());
        // 獲取所有一級(jí)子標(biāo)簽
        List<Element> elements = rootElement.elements();
        for (int i = 0; i < elements.size(); i++){
            if(elements.get(i).attributeValue("name").equals("蘋(píng)果")){
                // 刪除
                elements.get(i).detach();
            }else {
                // 修改
                elements.get(i).setAttributeValue("name", "華為手機(jī)");
            }
        }

        // 設(shè)置XML文件的格式
        OutputFormat outputFormat = OutputFormat.createPrettyPrint();
        outputFormat.setEncoding("GB2312");   // 設(shè)置編碼格式

        // 寫(xiě)入XML文件的位置 以及指定的格式
        XMLWriter xmlWriter=new XMLWriter(new FileWriter("./src/com/hsh/exercise5/exercise.xml"),outputFormat);
        // 開(kāi)始寫(xiě)入XML文件   寫(xiě)入Document對(duì)象
        xmlWriter.write(document);
        xmlWriter.close();
    }
}

<?xml version="1.0" encoding="GB2312"?>

<PhoneInfo> 
  <Brand name="華為手機(jī)"> 
    <Type name="U8650"/>  
    <Type name="HW123"/>  
    <Type name="HW321"/> 
  </Brand> 
</PhoneInfo>

package com.hsh.exercise5;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

import java.io.FileWriter;

public class WriteXML {
    public static void main(String[] args) throws Exception {
        // 創(chuàng)建根元素對(duì)象
        Element rootElement = DocumentHelper.createElement("PhoneInfo");
        // 創(chuàng)建子元素
        Element Brand = DocumentHelper.createElement("Brand");
        Brand.addAttribute("name","華為");
        Element Type  = DocumentHelper.createElement("Type");
        // 設(shè)置子元素的屬性
        Type.addAttribute("name","P10");
        Brand.add(Type);
        rootElement.add(Brand);
        
        // 創(chuàng)建Document對(duì)象
        Document document = DocumentHelper.createDocument(rootElement);

        // 設(shè)置XML文件的格式
        OutputFormat outputFormat = OutputFormat.createPrettyPrint();
        outputFormat.setEncoding("GB2312");   // 設(shè)置編碼格式

        // 寫(xiě)入XML文件的位置 以及指定的格式
        XMLWriter xmlWriter=new XMLWriter(new FileWriter("./src/com/hsh/exercise5/exercise.xml"),outputFormat);
        // 開(kāi)始寫(xiě)入XML文件   寫(xiě)入Document對(duì)象
        xmlWriter.write(document);
        xmlWriter.close();
    }
}

<?xml version="1.0" encoding="GB2312"?>

<PhoneInfo>
  <Brand name="華為">
    <Type name="P10"/>
  </Brand>
</PhoneInfo>

package com.hsh.exercise5;

public class Test {
    public static void main(String[] args) throws Exception {
        XmlServise xmlServise = new XmlServise("./src/com/hsh/exercise5/收藏信息.xml");

        xmlServise.addElemnet("小米","小米15");
        xmlServise.addElemnet("小米","小米14");
        xmlServise.addElemnet("三星","酸14");
        xmlServise.addElemnet("三星","三星14");
        xmlServise.addElemnet("三星","小米14");
        xmlServise.delType("三星","小米14");
        xmlServise.delBrand("三星");
        xmlServise.updateType("小米","小米14","小米13");
        xmlServise.updateBrand("小米","三星");
        xmlServise.updateBrand("三星","小米");
        xmlServise.save();
        xmlServise.print();
    }
}

package com.hsh.exercise5;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import java.io.FileWriter;
import java.util.List;

public class XmlServise {
    public Document document;
    public String url;
    SAXReader saxReader = new SAXReader();
    public XmlServise(String url) throws Exception {
        this.url = url;
        this.document =saxReader.read(url);
    }

    public void print(){
        // 獲取根節(jié)點(diǎn)
        Element rootElement = document.getRootElement();
        // 獲取根節(jié)點(diǎn)的所有子標(biāo)簽
        List<Element> elements = rootElement.elements();
        for (int i = 0; i < elements.size(); i++){
            System.out.print("手機(jī)品牌：");
            //  獲取屬性值
            System.out.print(elements.get(i).attributeValue("name")+",");

            System.out.print("手機(jī)型號(hào)：");
            for (int j = 0; j < elements.get(i).elements().size(); j++){
                //  獲取屬性
                System.out.print(elements.get(i).elements().get(j).attributeValue("name")+"  ");
            }
            System.out.println();
        }
    }


    public void save() throws Exception {
        // 設(shè)置XML文件的格式
        OutputFormat outputFormat = OutputFormat.createPrettyPrint();
        outputFormat.setEncoding("UTF-8");
        XMLWriter  xmlWriter=new XMLWriter(new FileWriter(url),outputFormat);
        xmlWriter.write(document);
        xmlWriter.close();
    }

    public void addElemnet(String brand, String type) throws Exception{
        // 獲取根節(jié)點(diǎn)
        Element rootElement = document.getRootElement();
        boolean isBrandExist = false;
        boolean isTypeExist = false;
        // 遍歷查找是否有brand的name屬性的名字相同的
        List<Element> elements = rootElement.elements();
        for (int i = 0; i < elements.size(); i++){
            if(elements.get(i).attributeValue("name").equals(brand)){
                isBrandExist = true;
                List<Element> elements1 = elements.get(i).elements();
                for (int j = 0; j < elements1.size(); j++){
                    if(elements1.get(j).attributeValue("name").equals(type)){
                        isTypeExist = true;
                    }
                }
            }
        }
        if(isBrandExist){
            if(isTypeExist){
                // 不添加
            }else {
                // 遍歷找到該品牌并添加
                for (int i = 0; i < elements.size(); i++){
                    if(elements.get(i).attributeValue("name").equals(brand)){
                        Element element = DocumentHelper.createElement("type");
                        element.addAttribute("name",type);
                        elements.get(i).add(element);
                    }
                }
            }
        }else {
            Element element = DocumentHelper.createElement("brand");
            element.addAttribute("name",brand);
            Element element1 = DocumentHelper.createElement("type");
            element1.addAttribute("name",type);
            element.add(element1);
            rootElement.add(element);
        }


    }

    public void delType(String brand, String type) {
        // 獲取根節(jié)點(diǎn)
        Element rootElement = document.getRootElement();
        for (int i = 0; i < rootElement.elements().size(); i++){
            if(rootElement.elements().get(i).attributeValue("name").equals(brand)){
                for (int j = 0; j < rootElement.elements().get(i).elements().size(); j++){
                    if(rootElement.elements().get(i).elements().get(j).attributeValue("name").equals(type)){
                        rootElement.elements().get(i).elements().remove(j);
                    }
                }
            }
        }
    }

    public void delBrand(String brand) {
        // 獲取根節(jié)點(diǎn)
        Element rootElement = document.getRootElement();
        for (int i = 0; i < rootElement.elements().size(); i++){
            if(rootElement.elements().get(i).attributeValue("name").equals(brand)){
                rootElement.elements().remove(i);
            }
        }
    }

    public void updateType(String brand, String name, String newName) {
        // 獲取根節(jié)點(diǎn)
        Element rootElement = document.getRootElement();
        for (int i = 0; i < rootElement.elements().size(); i++){
            if(rootElement.elements().get(i).attributeValue("name").equals(brand)){
                for (int j = 0; j < rootElement.elements().get(i).elements().size(); j++){
                    if(rootElement.elements().get(i).elements().get(j).attributeValue("name").equals(name)){
                        rootElement.elements().get(i).elements().get(j).addAttribute("name",newName);
                    }
                }
            }
        }
    }

    public void updateBrand(String brand, String newBrand) {
        // 獲取根節(jié)點(diǎn)
        Element rootElement = document.getRootElement();
        for (int i = 0; i < rootElement.elements().size(); i++){
            if(rootElement.elements().get(i).attributeValue("name").equals(brand)){
                rootElement.elements().get(i).addAttribute("name",newBrand);
            }
        }
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<PhoneInfo> 
  <Brand name="華為"> 
    <Type name="U8650"/>  
    <Type name="HW123"/>  
    <Type name="HW321"/> 
  </Brand>  
  <Brand name="蘋(píng)果"> 
    <Type name="iPhone4"/> 
  </Brand>  
  <brand name="小米">
    <type name="小米15"/>
    <type name="小米13"/>
  </brand>
</PhoneInfo>

<?xml version="1.0" encoding="GBK"?>
<citys>
	<city id='010'>
		<cityname>北京</cityname>
		<cityarea>華北</cityarea>
		<population>2114.8萬(wàn)人</population>
	</city>
	<city id='021'>
		<cityname>上海</cityname>
		<cityarea>華東</cityarea>
		<population>2,500萬(wàn)人</population>
	</city>
	<city id='020'>
		<cityname>廣州</cityname>
		<cityarea>華南</cityarea>
		<population>1292.68萬(wàn)人</population>
	</city>
	<city id='028'>
		<cityname>成都</cityname>
		<cityarea>華西</cityarea>
		<population>1417萬(wàn)人</population>
	</city>
</citys>

<?xml version="1.0" encoding="UTF-8"?>
<citys> 
  <city id="010"> 
    <cityname>北京</cityname>  
    <cityarea>華北</cityarea>  
    <population>2114.8萬(wàn)人</population> 
  </city>  
  <city id="021"> 
    <cityname>上海</cityname>  
    <cityarea>華東</cityarea>  
    <population>2,500萬(wàn)人</population> 
  </city>  
  <city id="020"> 
    <cityname>廣州</cityname>  
    <cityarea>華南</cityarea>  
    <population>1292.68萬(wàn)人</population> 
  </city>  
  <city id="028"> 
    <cityname>成都</cityname>  
    <cityarea>華西</cityarea>  
    <population>1417萬(wàn)人</population> 
  </city>
</citys>

package com.hsh.homework1;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public int port;
    ServerSocket s;
    Socket socket;
    OutputStream os;
    InputStream is;

    public Server(int port) {
        this.port = port;
    }

    public void start() throws Exception {
        System.out.println("服務(wù)器啟動(dòng)成功");
        s = new ServerSocket(port);
        // 每使用一次 accept 說(shuō)明一個(gè)客戶(hù)端連接
        // 再次使用就和上一次的客戶(hù)端連接斷開(kāi)
        socket = s.accept(); // 只 accept 一次
        is = socket.getInputStream();
        os = socket.getOutputStream();
        System.out.println("客戶(hù)端已連接");
    }

    public void stop() throws Exception {
        s.close();
    }

    /**
     * 發(fā)送消息 比如返回該城市的信息
     * @param msg
     * @throws Exception
     */
    public void responseMsg(String msg) throws Exception {
        System.out.println("服務(wù)器開(kāi)始發(fā)送");
        os.write((msg+"END").getBytes());
        System.out.println("服務(wù)器發(fā)送成功");
    }

    /**
     * 接收指令
     * @return
     * @throws Exception
     */
    public String receiveMsg() throws Exception {
        System.out.println("服務(wù)器開(kāi)始接收");
        byte[] b = new byte[1024];
        int len;
        String str = "";
        boolean receivedEnd = false;
        while (!receivedEnd && (len = is.read(b)) != -1) {
            str += new String(b, 0, len);
            if (str.contains("END")) {
                str = str.replace("END", ""); // 去掉結(jié)束符
                receivedEnd = true;
            }
        }
        return str;
    }

}

package com.hsh.homework1;

public class ServerTest {
    public static void main(String[] args) throws Exception {
        Server server = new Server(9999);
        server.start();
        XmlServise xmlServise = new XmlServise("src/com/hsh/homework1/citys.xml");

        while (true) {
            String msg = server.receiveMsg();
            System.out.println("收到客戶(hù)端指令: " + msg);
            switch (msg){
                case "1":
                    // 接收要查詢(xún)的省份id
                    String provinceId = server.receiveMsg();
                    System.out.println("查詢(xún)省份id: " + provinceId);

                    String cityInfo = xmlServise.getCityInfo(provinceId);
                    server.responseMsg(cityInfo);
                    System.out.println();
                    break;
                case "2":
                    String addCityInfo =server.receiveMsg();
                    System.out.println("添加城市信息: " + addCityInfo);
                    String[] arr = Utils.split(addCityInfo);
                    xmlServise.addCity(arr[0], arr[1], arr[2], arr[3]);
                    xmlServise.save();
                    break;
                default:
                    server.responseMsg("無(wú)效指令");
                    break;
            }
        }
    }
}

package com.hsh.homework1;

import java.io.OutputStream;
import java.lang.reflect.Array;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class Client {
    String url;
    int port;
    Socket socket;
    OutputStream os;

    public Client(String url, int port) {
        this.url = url;
        this.port = port;
    }

    public void start() throws Exception {
        socket = new Socket(url, port);
        System.out.println("客戶(hù)端啟動(dòng)成功");
    }
    /**
     * 接收消息
     * @return
     * @throws Exception
     */
    public String receiveMsg() throws Exception {
        System.out.println("客戶(hù)端開(kāi)始接收");
        socket.getInputStream();
        byte[] b = new byte[1024];
        int len;
        String str = "";
        // 循環(huán)讀取，直到讀取到結(jié)束符,不然可能會(huì)卡在這不往下走。
        boolean receivedEnd = false;
        while (!receivedEnd && (len = socket.getInputStream().read(b)) != -1) {
            str += new String(b, 0, len);
            if (str.contains("END")) {
                str = str.replace("END", ""); // 去掉結(jié)束符
                receivedEnd = true;
            }
        }
        System.out.println("客戶(hù)端接收成功");

        return str;
    }

    /**
     * 關(guān)閉
     *
     * @throws Exception
     */
    public void stop() throws Exception {
        os.close();
        socket.close();
    }

    /**
     * 發(fā)送消息
     *
     * @param instructions
     * @throws Exception
     */
    public void sendInstructions(String instructions) throws Exception {
        System.out.println("客戶(hù)端開(kāi)始發(fā)送");
        os = socket.getOutputStream();
        os.write((instructions + "END").getBytes());
        System.out.println("客戶(hù)端發(fā)送成功");
    }
}

package com.hsh.homework1;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class ClientTest {
    public static void main(String[] args) throws Exception {
        Client client = new Client("127.0.0.1", 9999);
        client.start();
        Scanner sc = new Scanner(System.in);

        while (true){
            System.out.println("請(qǐng)選擇操作");
            System.out.println("1.輸入城市ID查看城市信息");
            System.out.println("2.輸入城市id，省份，省份歸屬地，人口數(shù)");
            System.out.println("3.退出");
            switch (sc.next()){
                case "1":
                    client.sendInstructions("1");
                    System.out.println("請(qǐng)輸入城市ID");
//                    client.sendID(sc.next());
                    client.sendInstructions(sc.next());
                    System.out.println(client.receiveMsg());
                    break;
                case "2":
                    client.sendInstructions("2");
                    System.out.println("請(qǐng)輸入城市ID");
                    String id =sc.next();
                    System.out.println("請(qǐng)輸入省份");
                    String province =sc.next();
                    System.out.println("請(qǐng)輸入省份歸屬地");
                    String area =sc.next();
                    System.out.println("請(qǐng)輸入人口數(shù)");
                    String population =sc.next();
                    List<String> list = new ArrayList<>();
                    list.add(id);
                    list.add(province);
                    list.add(area);
                    list.add(population);
                    client.sendInstructions(list.toString());
//                    client.sendCityInfo(id,province,area,population);
                    break;
                case "3":
                    System.out.println("退出");
                    client.stop();
                    return;
                default:
                    System.out.println("請(qǐng)輸入正確的選項(xiàng)");
                    break;
            }
        }

    }
}

?
package com.hsh.homework1;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import java.io.FileWriter;

public class XmlServise {
    public Document document;
    public String url;
    SAXReader saxReader = new SAXReader();
    public XmlServise(String url) throws Exception {
        this.url = url;
        this.document =saxReader.read(url);
    }
    public String printXml() {
        // 直接輸出xml內(nèi)容
        return document.asXML();
    }
    public void print() {
        // 直接輸出xml內(nèi)容
        // System.out.println(document.asXML());
        // System.out.println();
        Element rootElement = document.getRootElement();
        for (int i = 0; i < rootElement.elements().size(); i++){
            Element element = rootElement.elements().get(i);
            System.out.println(element.attributeValue("id"));
            for (int j = 0; j < element.elements().size(); j++){
                Element element1 = element.elements().get(j);
                System.out.println("    "+element1.getText());
            }
        }
    }


    public void addCity(String number, String cityname, String cityarea, String population) {
        Element rootElement = document.getRootElement();
        // 創(chuàng)建city元素
        Element city = DocumentHelper.createElement("city");
        city.addAttribute("id",number);
        // 創(chuàng)建cityname元素
        Element citynameElement = DocumentHelper.createElement("cityname");
        citynameElement.setText(cityname);
        // 創(chuàng)建cityarea元素
        Element cityareaElement = DocumentHelper.createElement("cityarea");
        cityareaElement.setText(cityarea);
        // 創(chuàng)建population元素
        Element populationElement = DocumentHelper.createElement("population");
        populationElement.setText(population);
        city.add(citynameElement);
        city.add(cityareaElement);
        city.add(populationElement);
        rootElement.add(city);

    }

    /**
     * 獲取城市信息
     * @param provinceId
     * @return
     */
    public String getCityInfo(String provinceId) {
        Element rootElement = document.getRootElement();
        for (int i = 0; i < rootElement.elements().size(); i++){
            Element element = rootElement.elements().get(i);
            if(element.attributeValue("id").equals(provinceId)){
                StringBuilder stringBuilder = new StringBuilder();
                for (int j = 0; j < element.elements().size(); j++){
                    Element element1 = element.elements().get(j);
                    stringBuilder.append(element1.getText());
                    stringBuilder.append(" ");
                }
                return stringBuilder.toString();
            }
        }
        return "沒(méi)有此城市";
    }

    public void save() throws Exception{
        OutputFormat outputFormat = OutputFormat.createPrettyPrint();
        outputFormat.setEncoding("UTF-8");
        XMLWriter  xmlWriter=new XMLWriter(new FileWriter(url),outputFormat);
        xmlWriter.write(document);
        xmlWriter.close();
    }
}

?

package com.hsh.homework1;

public class Utils {
    public static String[] split(String str) {
        String[] arr = str.substring(1, str.length() - 1).split(",");
        for (int i = 0; i < arr.length; i++) {
            arr[i] = arr[i].trim();
            System.out.println(arr[i]);
        }
        return arr;
    }
}

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

<citys> 
  <city id="010"> 
    <cityname>北京</cityname>  
    <cityarea>華北</cityarea>  
    <population>2114.8萬(wàn)人</population> 
  </city>  
  <city id="021"> 
    <cityname>上海</cityname>  
    <cityarea>華東</cityarea>  
    <population>2,500萬(wàn)人</population> 
  </city>  
  <city id="020"> 
    <cityname>廣州</cityname>  
    <cityarea>華南</cityarea>  
    <population>1292.68萬(wàn)人</population> 
  </city>  
  <city id="028"> 
    <cityname>成都</cityname>  
    <cityarea>華西</cityarea>  
    <population>1417萬(wàn)人</population> 
  </city>  
  <city id="035">
    <cityname>河南</cityname>
    <cityarea>華中</cityarea>
    <population>1234萬(wàn)人</population>
  </city>
</citys>