fix:和string互转

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_003_Test_put.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+
+import static com.kwan.shuyu.until.ByteBufferUtil.debugAll;
+
+/**
+ * ByteBuffer放入数据并读取数据
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_003_Test_put {
+    public static void main(String[] args) {
+        ByteBuffer buffer = ByteBuffer.allocate(10);
+        buffer.put((byte) 0x61);
+        debugAll(buffer);
+        buffer.put(new byte[]{0x62, 0x63, 0x64});
+        buffer.flip();
+        System.out.println(buffer.get());
+        debugAll(buffer);
+    }
+}

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_004_Test_flip.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+
+import static com.kwan.shuyu.until.ByteBufferUtil.debugAll;
+
+/**
+ * ByteBuffer放入数据并读取数据
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_004_Test_flip {
+    public static void main(String[] args) {
+        ByteBuffer buffer = ByteBuffer.allocate(10);
+        buffer.put((byte) 0x61);
+        debugAll(buffer);
+        buffer.put(new byte[]{0x62, 0x63, 0x64});
+        buffer.flip();
+        System.out.println(buffer.get());
+        debugAll(buffer);
+        buffer.compact();
+        debugAll(buffer);
+        buffer.put(new byte[]{0x65, 0x6f});
+        debugAll(buffer);
+    }
+}

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_005_Test_compact.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+
+import static com.kwan.shuyu.until.ByteBufferUtil.debugAll;
+
+/**
+ * ByteBuffer放入数据并读取数据
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_005_Test_compact {
+    public static void main(String[] args) {
+        ByteBuffer buffer = ByteBuffer.allocate(10);
+        buffer.put((byte) 0x61);
+        debugAll(buffer);
+        buffer.put(new byte[]{0x62, 0x63, 0x64});
+        buffer.flip();
+        System.out.println(buffer.get());
+        debugAll(buffer);
+        buffer.compact();
+        debugAll(buffer);
+        buffer.put(new byte[]{0x65, 0x6f});
+        debugAll(buffer);
+    }
+}

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_006_Test_allocate.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+
+/**
+ * ByteBuffer放入数据并读取数据
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_006_Test_allocate {
+    public static void main(String[] args) {
+        System.out.println(ByteBuffer.allocate(16).getClass().getSimpleName());
+        System.out.println(ByteBuffer.allocateDirect(16).getClass().getSimpleName());
+    }
+}

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_007_Test_read.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import com.kwan.shuyu.until.ByteBufferUtil;
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+
+/**
+ * ByteBuffer放入数据并读取数据
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_007_Test_read {
+    public static void main(String[] args) {
+        ByteBuffer buffer = ByteBuffer.allocate(10);
+        buffer.put(new byte[]{'a', 'b', 'c', 'd'});
+        buffer.flip();
+        buffer.get(new byte[4]);
+        ByteBufferUtil.debugAll(buffer);
+        buffer.rewind();//恢复到起始位置
+        System.out.println((char) buffer.get());
+    }
+}

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_008_Test_mark.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+
+/**
+ * ByteBuffer放入数据并读取数据
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_008_Test_mark {
+    public static void main(String[] args) {
+        ByteBuffer buffer = ByteBuffer.allocate(10);
+        buffer.put(new byte[]{'a', 'b', 'c', 'd'});
+        buffer.flip();
+        System.out.println((char) buffer.get());
+        System.out.println((char) buffer.get());
+        buffer.mark();// 加标记，泰列2的位置
+        System.out.println((char) buffer.get());
+        System.out.println((char) buffer.get());
+        buffer.reset();//将position 重置到泰列 2
+        System.out.println((char) buffer.get());
+        System.out.println((char) buffer.get());
+    }
+}

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_009_Test_get.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+
+/**
+ * ByteBuffer放入数据并读取数据
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_009_Test_get {
+    public static void main(String[] args) {
+        ByteBuffer buffer = ByteBuffer.allocate(10);
+        buffer.put(new byte[]{'a', 'b', 'c', 'd'});
+        buffer.flip();
+        System.out.println((char) buffer.get());
+        System.out.println((char) buffer.get());
+        buffer.mark();// 加标记，泰列2的位置
+        System.out.println((char) buffer.get());
+        System.out.println((char) buffer.get());
+        buffer.reset();//将position 重置到泰列 2
+        System.out.println((char) buffer.get());
+        System.out.println((char) buffer.get());
+
+        //get(i）不会改交读索引的位骂
+       System.out.println((char) buffer.get(3));
+       System.out.println((buffer));
+    }
+}

src/main/java/com/kwan/shuyu/heima/bytebuffer/ByteBuffer_010_Test_String.java

+package com.kwan.shuyu.heima.bytebuffer;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+
+import static com.kwan.shuyu.until.ByteBufferUtil.debugAll;
+
+/**
+ * 字符串放入到ByteBuffer中
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/18 17:15
+ */
+@Slf4j
+public class ByteBuffer_010_Test_String {
+    public static void main(String[] args) {
+        //方式一,不会自动切换到读模式
+        ByteBuffer buffer1 = ByteBuffer.allocate(16);
+        buffer1.put("hello".getBytes());
+        debugAll(buffer1);
+        //方式二,自动切换到读模式
+        ByteBuffer buffer2 = StandardCharsets.UTF_8.encode("hello");
+        debugAll(buffer2);
+        //方式三,自动切换到读模式
+        final ByteBuffer buffer3 = ByteBuffer.wrap("hello".getBytes());
+        debugAll(buffer3);
+        //转为字符串
+        final String s2 = StandardCharsets.UTF_8.decode(buffer2).toString();
+        System.out.println(s2);
+        final String s1 = StandardCharsets.UTF_8.decode(buffer1).toString();
+        System.out.println(s1);//解码失败
+        final String s3 = StandardCharsets.UTF_8.decode(buffer3).toString();
+        System.out.println(s3);
+    }
+}