69期JavaSE029_XML解析

### 综合练习使用 Socket 和多线程编写一个简单的聊天小程序&＃xff0c;要求客户端和服务端交替发送消息&＃xff0c;在客户端和服务端都能看到彼此的聊天记录。Server&＃96;&＃96;&＃96;java
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;public class Server {public static void main(String[] args) {ServerSocket serverSocket &＃61; null;Socket socket &＃61; null;try {serverSocket &＃61; new ServerSocket(8080);System.out.println("服务端已启动");while(true) {socket &＃61; serverSocket.accept();new Thread(new SocketThread(socket)).start();;}} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}}
}
&＃96;&＃96;&＃96;ServerThread&＃96;&＃96;&＃96;java
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Scanner;public class SocketThread implements Runnable {private Socket socket;public SocketThread(Socket socket) {this.socket &＃61; socket;}&＃64;Overridepublic void run() {// TODO Auto-generated method stubInputStream inputStream &＃61; null;DataInputStream dataInputStream &＃61; null;Scanner scanner &＃61; new Scanner(System.in);String message &＃61; null;OutputStream outputStream &＃61; null;DataOutputStream dataOutputStream &＃61; null;try {while(true) {//读inputStream &＃61; socket.getInputStream();dataInputStream &＃61; new DataInputStream(inputStream);message &＃61; dataInputStream.readUTF();System.out.println("客户端&＃xff1a;"&＃43;message);//写System.out.print("服务器&＃xff1a;");message &＃61; scanner.next();outputStream &＃61; socket.getOutputStream();dataOutputStream &＃61; new DataOutputStream(outputStream);dataOutputStream.writeUTF(message);}} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}finally {try {dataOutputStream.close();outputStream.close();dataInputStream.close();inputStream.close();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}}}
}
&＃96;&＃96;&＃96;Client&＃96;&＃96;&＃96;java
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;public class Client {public static void main(String[] args) {Socket socket &＃61; null;InputStream inputStream &＃61; null;DataInputStream dataInputStream &＃61; null;OutputStream outputStream &＃61; null;DataOutputStream dataOutputStream &＃61; null;System.out.println("客户端已启动...");try {socket &＃61; new Socket("127.0.0.1", 8080);Scanner scanner &＃61; new Scanner(System.in);String message &＃61; null;while(true) {//写System.out.print("客户端&＃xff1a;");message &＃61; scanner.next();outputStream &＃61; socket.getOutputStream();dataOutputStream &＃61; new DataOutputStream(outputStream);dataOutputStream.writeUTF(message);//读inputStream &＃61; socket.getInputStream();dataInputStream &＃61; new DataInputStream(inputStream);message &＃61; dataInputStream.readUTF();System.out.println("服务器&＃xff1a;"&＃43;message);}} catch (UnknownHostException e) {// TODO Auto-generated catch block
e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}finally {try {dataInputStream.close();inputStream.close();dataOutputStream.close();outputStream.close();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}}}
}
&＃96;&＃96;&＃96;### XML 解析XML&＃xff1a;Extensible Markup Language 可扩展标记语言特点&＃xff1a;XML 与操作系统无关、与编程语言无关&＃xff0c;可以实现不同系统之间的数据交换。XML 文档内容由一系列标签元素组成<标签名 属性名&＃61;"属性值">元素内容- 属性值用双引号包裹
- 一个元素可以包含多个属性
- 属性值中不能直接包含<、>、"、&、&＃39;

&＃96;&＃96;&＃96;xml

张三Java高级编程Java是一门面向对象高级编程语言

&＃96;&＃96;&＃96;注意事项- 所有 XML 元素都必须有结束标签
- XML 标签对大小写敏感
- XML 必须有正确的嵌套
- 同级标签以缩进对齐
- 元素名称可以包含字母、数字或其他字符
- 元素名称不能以数字或标点符号开头
- 元素名称不能包含空格XML 的转义字符特殊字符&＃xff1a;<> " &＃39; &

转义符&＃xff1a;&＃96;&＃96;&＃96;
<> " ' &amp;
&＃96;&＃96;&＃96;衣服型号 对应身高S <165M 165-170L 170-175XL 175-180XXL 180-185&＃96;&＃96;&＃96;xml

165">SMLXLXXL

&＃96;&＃96;&＃96;考生姓名 预计得分 实际得分张三 75 80李四 75 88&＃96;&＃96;&＃96;xml



&＃96;&＃96;&＃96;### 解析XML用 Java 程序读取、操作 XML 文件中的数据dom4j 主流的 Java XML API&＃xff0c;性能优异&＃xff0c;功能强大。&＃96;&＃96;&＃96;xml



&＃96;&＃96;&＃96;&＃96;&＃96;&＃96;java
import java.util.Iterator;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;public class Test {public static void main(String[] args) {SAXReader saxReader &＃61; new SAXReader();try {Document document &＃61; saxReader.read("src/phone.xml");//获取根节点Element root &＃61; document.getRootElement();Iterator rootIter &＃61; root.elementIterator();while(rootIter.hasNext()) {Element ele &＃61; rootIter.next();String name &＃61; ele.attributeValue("name");System.out.println(name);Iterator eleIter &＃61; ele.elementIterator();while(eleIter.hasNext()) {Element type &＃61; eleIter.next();String typeName &＃61; type.attributeValue("name");System.out.println(typeName);}}} catch (DocumentException e) {// TODO Auto-generated catch block
e.printStackTrace();}}
}
&＃96;&＃96;&＃96;&＃96;&＃96;&＃96;java
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;public class Test2 {public static void main(String[] args) {SAXReader saxReader &＃61; new SAXReader();try {Document document &＃61; saxReader.read("src/phone.xml");Element root &＃61; document.getRootElement();Element newEle &＃61; root.addElement("brand");newEle.addAttribute("name", "Vivo");Element type &＃61; newEle.addElement("type");type.addAttribute("name", "型号1");OutputFormat format &＃61; OutputFormat.createPrettyPrint();format.setEncoding("UTF-8");Writer fileWriter &＃61; new FileWriter("src/phone.xml");XMLWriter writer &＃61; new XMLWriter(fileWriter,format);writer.write(document);writer.close();} catch (DocumentException e) {// TODO Auto-generated catch block
e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}}
}
&＃96;&＃96;&＃96;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;public class Client {public static void main(String[] args) {Socket socket &＃61; null;InputStream inputStream &＃61; null;DataInputStream dataInputStream &＃61; null;OutputStream outputStream &＃61; null;DataOutputStream dataOutputStream &＃61; null;System.out.println("客户端已启动...");try {socket &＃61; new Socket("127.0.0.1", 8080);Scanner scanner &＃61; new Scanner(System.in);String message &＃61; null;while(true) {//写System.out.print("客户端&＃xff1a;");message &＃61; scanner.next();outputStream &＃61; socket.getOutputStream();dataOutputStream &＃61; new DataOutputStream(outputStream);dataOutputStream.writeUTF(message);//读inputStream &＃61; socket.getInputStream();dataInputStream &＃61; new DataInputStream(inputStream);message &＃61; dataInputStream.readUTF();System.out.println("服务器&＃xff1a;"&＃43;message);}} catch (UnknownHostException e) {// TODO Auto-generated catch block
e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}finally {try {dataInputStream.close();inputStream.close();dataOutputStream.close();outputStream.close();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}}}
}

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?>
<cloth><size range&＃61;"height>165">Ssize><size range&＃61;"165>Msize><size range&＃61;"170>Lsize><size range&＃61;"175>XLsize><size range&＃61;"180>XXLsize>
cloth>

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?><phoneinfo id&＃61;"1"> <brand name&＃61;"华为"> <type name&＃61;"U8650"/> <type name&＃61;"HW123"/> <type name&＃61;"HW321"/> brand> <brand name&＃61;"苹果"> <type name&＃61;"iPhone"/> brand> <brand name&＃61;"三星"> <type name&＃61;"Note4"/> brand> <brand name&＃61;"Vivo"/> <brand name&＃61;"Vivo"><type name&＃61;"型号1"/>brand>
phoneinfo>

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?>
<students><student name&＃61;"张三" expected_score&＃61;"75" score&＃61;"80">student><student name&＃61;"李四" expected_score&＃61;"75" score&＃61;"88">student>
students>

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;public class Server {public static void main(String[] args) {ServerSocket serverSocket &＃61; null;Socket socket &＃61; null;try {serverSocket &＃61; new ServerSocket(8080);System.out.println("服务端已启动");while(true) {socket &＃61; serverSocket.accept();new Thread(new SocketThread(socket)).start();;}} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}}
}

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Scanner;public class SocketThread implements Runnable {private Socket socket;public SocketThread(Socket socket) {this.socket &＃61; socket;}&＃64;Overridepublic void run() {// TODO Auto-generated method stubInputStream inputStream &＃61; null;DataInputStream dataInputStream &＃61; null;Scanner scanner &＃61; new Scanner(System.in);String message &＃61; null;OutputStream outputStream &＃61; null;DataOutputStream dataOutputStream &＃61; null;try {while(true) {//读inputStream &＃61; socket.getInputStream();dataInputStream &＃61; new DataInputStream(inputStream);message &＃61; dataInputStream.readUTF();System.out.println("客户端&＃xff1a;"&＃43;message);//写System.out.print("服务器&＃xff1a;");message &＃61; scanner.next();outputStream &＃61; socket.getOutputStream();dataOutputStream &＃61; new DataOutputStream(outputStream);dataOutputStream.writeUTF(message);}} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}finally {try {dataOutputStream.close();outputStream.close();dataInputStream.close();inputStream.close();} catch (IOException e) {// TODO Auto-generated catch block
e.printStackTrace();}}}}

import java.util.Iterator;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;public class Test {public static void main(String[] args) {SAXReader saxReader &＃61; new SAXReader();try {Document document &＃61; saxReader.read("src/phone.xml");//获取根节点Element root &＃61; document.getRootElement();Iterator rootIter &＃61; root.elementIterator();while(rootIter.hasNext()) {Element ele &＃61; rootIter.next();String name &＃61; ele.attributeValue("name");System.out.println(name);Iterator eleIter &＃61; ele.elementIterator();while(eleIter.hasNext()) {Element type &＃61; eleIter.next();String typeName &＃61; type.attributeValue("name");System.out.println(typeName);}}} catch (DocumentException e) {// TODO Auto-generated catch block
e.printStackTrace();}}
}

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?>
<books><book id&＃61;"001"><author>张三author><name>Java高级编程name><description>Java是一门面向对象高级编程语言description>book><book id&＃61;"002" author&＃61;"李四" name&＃61;"C#" description&＃61;"面向对象">book>
books>

import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;public class Test2 {public static void main(String[] args) {SAXReader saxReader &＃61; new SAXReader();try {Document document &＃61; saxReader.read("src/phone.xml");Element root &＃61; document.getRootElement();Element newEle &＃61; root.addElement("brand");newEle.addAttribute("name", "Vivo");Element type &＃61; newEle.addElement("type");type.addAttribute("name", "型号1");OutputFormat format &＃61; OutputFormat.createPrettyPrint();format.setEncoding("UTF-8");Writer fileWriter &＃61; new FileWriter("src/phone.xml");XMLWriter writer &＃61; new XMLWriter(fileWriter,format);writer.write(document);writer.close();} catch (DocumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}