feat(新增): 🚀 nio编程

.idea/compiler.xml

@@ -2,6 +2,7 @@
 <project version="4">
   <component name="CompilerConfiguration">
     <annotationProcessing>
+      <profile default="true" name="Default" enabled="true" />
       <profile name="Maven default annotation processors profile" enabled="true">
         <sourceOutputDir name="target/generated-sources/annotations" />
         <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,8 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="AutoCloseableResource" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="METHOD_MATCHER_CONFIG" value="java.util.Formatter,format,java.io.Writer,append,com.google.common.base.Preconditions,checkNotNull,org.hibernate.Session,close,java.io.PrintWriter,printf,java.io.PrintStream,printf,java.nio.channels.ServerSocketChannel,open" />
+    </inspection_tool>
+  </profile>
+</component>

.idea/misc.xml

@@ -8,7 +8,7 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_X" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

demo1/pom.xml

@@ -9,8 +9,28 @@
     <version>1.0-SNAPSHOT</version>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.source>22</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.target>22</maven.compiler.target>
+        <lombok.version>1.18.32</lombok.version>
     </properties>
 
+    <dependencies>
+        <!-- lombok -->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>${lombok.version}</version>
+        </dependency>
+        <!-- hu tool -->
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+            <version>5.8.27</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>2.0.13</version>
+        </dependency>
+    </dependencies>
 </project>

demo1/src/main/java/cn/bunny/file_dir/ClientDemo.java

@@ -0,0 +1,17 @@
+package cn.bunny.file_dir;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.channels.SocketChannel;
+
+@Slf4j
+public class ClientDemo {
+    public static void main(String[] args) throws IOException {
+        SocketChannel socketChannel = SocketChannel.open();
+        socketChannel.connect(new InetSocketAddress("localhost", 8080));
+        // socketChannel.write(Charset.defaultCharset().encode("hello"))
+        System.out.println("等待。。。");
+    }
+}

demo1/src/main/java/cn/bunny/file_dir/Server2Demo.java

@@ -0,0 +1,61 @@
+package cn.bunny.file_dir;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.Selector;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+import java.util.Iterator;
+
+public class Server2Demo {
+    public static void main(String[] args) throws IOException {
+        // 创建Selector
+        Selector selector = Selector.open();
+
+        // 创建服务器
+        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
+        serverSocketChannel.configureBlocking(false);
+        SelectionKey selectionKey = serverSocketChannel.register(selector, 0, null);
+
+        // 只关注channel
+        selectionKey.interestOps(SelectionKey.OP_ACCEPT);
+        System.out.println(STR."注册时的key：\{selectionKey}");
+
+        // 模拟监听端口
+        serverSocketChannel.bind(new InetSocketAddress(8080));
+
+        while (true) {
+            selector.select();
+            Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
+            while (iterator.hasNext()) {
+                SelectionKey key = iterator.next();
+                // 需要移出key，在事件集合中需要移出
+                iterator.remove();
+                if (key.isAcceptable()) {
+                    ServerSocketChannel cancel = (ServerSocketChannel) key.channel();
+                    SocketChannel accept = cancel.accept();
+                    accept.configureBlocking(false);
+                    SelectionKey scKey = accept.register(selector, 0, null);
+                    scKey.interestOps(SelectionKey.OP_READ);
+                    System.out.println(STR."accept的key\{accept}");
+                    System.out.println(STR."scKey\{scKey}");
+                } else if (key.isReadable()) {
+                    try {
+                        SocketChannel channel = (SocketChannel) key.channel();
+                        ByteBuffer buffer = ByteBuffer.allocate(16);
+                        // 如果客户端断开，这里会报错
+                        channel.read(buffer);
+                        buffer.flip();
+                    } catch (IOException exception) {
+                        exception.printStackTrace();
+                        // 断开后会进行删除
+                        key.cancel();
+                    }
+
+                }
+            }
+        }
+    }
+}

demo1/src/main/java/cn/bunny/file_dir/ServerDemo.java

@@ -0,0 +1,76 @@
+package cn.bunny.file_dir;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.Selector;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+@Slf4j
+public class ServerDemo {
+    // 阻塞模式下只能接受一个连接
+    public static void main(String[] args) throws IOException {
+        // 创建Selector
+        Selector selector = Selector.open();
+
+        // 创建服务器
+        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
+        serverSocketChannel.configureBlocking(false);
+        SelectionKey selectionKey = serverSocketChannel.register(selector, 0, null);
+
+        // 只关注channel时间
+        selectionKey.interestOps(SelectionKey.OP_ACCEPT);
+        System.out.println(STR."注册时的key:\{selectionKey}");
+
+        // 模拟监听端口
+        serverSocketChannel.bind(new InetSocketAddress(8080));
+
+        while (true) {
+            selector.select();
+            // 处理事件
+            Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
+            while (iterator.hasNext()) {
+                SelectionKey key = iterator.next();
+                System.out.println(STR."key的值为\{key}");
+                ServerSocketChannel channel = (ServerSocketChannel) key.channel();
+                SocketChannel accept = channel.accept();
+                System.out.println(STR."接受到的值\{accept}");
+            }
+        }
+    }
+
+    private static void m1() throws IOException {
+        // 使用 ByteBuffer
+        ByteBuffer buffer = ByteBuffer.allocate(16);
+        // 创建服务器
+        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
+        serverSocketChannel.configureBlocking(false);
+        // 模拟监听端口
+        serverSocketChannel.bind(new InetSocketAddress(8080));
+        // 连接集合
+        ArrayList<SocketChannel> channels = new ArrayList<>();
+        while (true) {
+            SocketChannel accept = serverSocketChannel.accept();
+            if (accept != null) {
+                accept.configureBlocking(false);
+                channels.add(accept);
+            }
+            for (SocketChannel channel : channels) {
+                int read = channel.read(buffer);
+                // 当read大于0时才去读
+                if (read > 0) {
+                    buffer.flip();
+                    System.out.println((STR."读取到的内容：\{StandardCharsets.UTF_8.decode(buffer)}"));
+                    buffer.clear();
+                }
+            }
+        }
+    }
+}