nio 尚硅谷

ゞ浴缸里的玫瑰 2022-10-08 16:16 224阅读 0赞

# java nio和io的区别 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70]

# 通道和缓冲区 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 1]

# 缓冲区 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][20210622162703621.png]

@Test
      public void test3(){ 
    
        //1. 分配一个指定大小的非直接缓冲区
        ByteBuffer buf1 = ByteBuffer.allocate(1024);
        //2.分配直接缓冲区
        ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    
        System.out.println(buf.isDirect());
      }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 3]

@Test
      public void test1(){ 
        String str = "abcde";
    
        //1. 分配一个指定大小的缓冲区
        ByteBuffer buf = ByteBuffer.allocate(1024);
    
        System.out.println("-----------------allocate()----------------");
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.capacity());
    
        //2. 利用 put() 存入数据到缓冲区中
        buf.put(str.getBytes());
    
        System.out.println("-----------------put()----------------");
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.capacity());
    
        //3. 切换读取数据模式,将position的值设为0
        buf.flip();
    
        System.out.println("-----------------flip()----------------");
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.capacity());
    
        //4. 利用 get() 读取缓冲区中的数据
        byte[] dst = new byte[buf.limit()];
        buf.get(dst);
        System.out.println(new String(dst, 0, dst.length));
    
        System.out.println("-----------------get()----------------");
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.capacity());
    
        //5. rewind() : 可重复读
        buf.rewind();
    
        System.out.println("-----------------rewind()----------------");
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.capacity());
    
        //6. clear() : 清空缓冲区. 但是缓冲区中的数据依然存在，但是处于“被遗忘”状态
        buf.clear();
    
        System.out.println("-----------------clear()----------------");
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.capacity());
    
        System.out.println((char)buf.get());
    
      }

-----------------allocate()----------------
    0
    1024
    1024
    -----------------put()----------------
    5
    1024
    1024
    -----------------flip()----------------
    0
    5
    1024
    abcde
    -----------------get()----------------
    5
    5
    1024
    -----------------rewind()----------------
    0
    5
    1024
    -----------------clear()----------------
    0
    1024
    1024
    a

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 5]

### 缓冲区的基本属性 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 7]

### Buffer 的常用方法 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 8]

### 缓冲区的数据操作 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 9]

### 直接与非直接缓冲区 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 10]  
非直接缓冲区  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 11]

直接缓冲区  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 12]

## 通道（Channel） ##

**通道不存储数据，需要配合缓冲区也能传输数据，类似铁道需要火车才能运送乘客**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 13]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 14]  
![在这里插入图片描述][2021062216364646.png]

package com.nio.demo;
    
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.RandomAccessFile;
    import java.nio.ByteBuffer;
    import java.nio.CharBuffer;
    import java.nio.MappedByteBuffer;
    import java.nio.channels.FileChannel;
    import java.nio.channels.FileChannel.MapMode;
    import java.nio.charset.CharacterCodingException;
    import java.nio.charset.Charset;
    import java.nio.charset.CharsetDecoder;
    import java.nio.charset.CharsetEncoder;
    //import java.nio.file.Paths;
    //import java.nio.file.StandardOpenOption;
    import java.nio.file.Paths;
    import java.nio.file.StandardOpenOption;
    import java.util.Map;
    import java.util.Map.Entry;
    import java.util.Set;
    
    import org.junit.Test;
    
    /** * 一、通道（Channel）：用于源节点与目标节点的连接。在 Java NIO 中负责缓冲区中数据的传输。Channel 本身不存储数据，因此需要配合缓冲区进行传输。 * * 二、通道的主要实现类 * java.nio.channels.Channel 接口： * |--FileChannel * |--SocketChannel * |--ServerSocketChannel * |--DatagramChannel * * 三、获取通道 * 1. Java 针对支持通道的类提供了 getChannel() 方法 * 本地 IO： * FileInputStream/FileOutputStream * RandomAccessFile * * 网络IO： * Socket * ServerSocket * DatagramSocket * * 2. 在 JDK 1.7 中的 NIO.2 针对各个通道提供了静态方法 open() * 3. 在 JDK 1.7 中的 NIO.2 的 Files 工具类的 newByteChannel() * * 四、通道之间的数据传输 * transferFrom() * transferTo() * * 五、分散(Scatter)与聚集(Gather) * 分散读取（Scattering Reads）：将通道中的数据分散到多个缓冲区中 * 聚集写入（Gathering Writes）：将多个缓冲区中的数据聚集到通道中 * * 六、字符集：Charset * 编码：字符串 -> 字节数组 * 解码：字节数组 -> 字符串 * */
    public class TestChannel { 
      //使用直接缓冲区完成文件的复制(内存映射文件)
      @Test
      public void test2() throws IOException{ //2127-1902-1777
        long start = System.currentTimeMillis();
    
        FileChannel inChannel = FileChannel.open(Paths.get("d:/1.mkv"), StandardOpenOption.READ);
        FileChannel outChannel = FileChannel.open(Paths.get("d:/2.mkv"), StandardOpenOption.WRITE, StandardOpenOption.READ, StandardOpenOption.CREATE);
    
        //内存映射文件
        MappedByteBuffer inMappedBuf = inChannel.map(MapMode.READ_ONLY, 0, inChannel.size());
        MappedByteBuffer outMappedBuf = outChannel.map(MapMode.READ_WRITE, 0, inChannel.size());
    
        //直接对缓冲区进行数据的读写操作
        byte[] dst = new byte[inMappedBuf.limit()];
        inMappedBuf.get(dst);
        outMappedBuf.put(dst);
    
        inChannel.close();
        outChannel.close();
    
        long end = System.currentTimeMillis();
        System.out.println("耗费时间为：" + (end - start));
      }
    
      //利用通道完成文件的复制（非直接缓冲区）
      @Test
      public void test1(){ //10874-10953
        long start = System.currentTimeMillis();
    
        FileInputStream fis = null;
        FileOutputStream fos = null;
        //①获取通道
        FileChannel inChannel = null;
        FileChannel outChannel = null;
        try { 
          fis = new FileInputStream("e:/apps/1.txt");
          fos = new FileOutputStream("e:/apps/2.txt");
    
          inChannel = fis.getChannel();
          outChannel = fos.getChannel();
    
          //②分配指定大小的缓冲区
          ByteBuffer buf = ByteBuffer.allocate(1024);
    
          //③将通道中的数据存入缓冲区中
          while(inChannel.read(buf) != -1){ 
            buf.flip(); //切换读取数据的模式
            //④将缓冲区中的数据写入通道中
            outChannel.write(buf);
            buf.clear(); //清空缓冲区
          }
        } catch (IOException e) { 
          e.printStackTrace();
        } finally { 
          if(outChannel != null){ 
            try { 
              outChannel.close();
            } catch (IOException e) { 
              e.printStackTrace();
            }
          }
    
          if(inChannel != null){ 
            try { 
              inChannel.close();
            } catch (IOException e) { 
              e.printStackTrace();
            }
          }
    
          if(fos != null){ 
            try { 
              fos.close();
            } catch (IOException e) { 
              e.printStackTrace();
            }
          }
    
          if(fis != null){ 
            try { 
              fis.close();
            } catch (IOException e) { 
              e.printStackTrace();
            }
          }
        }
    
        long end = System.currentTimeMillis();
        System.out.println("耗费时间为：" + (end - start)+ "ms");
    
      }
    
      //字符集
      @Test
      public void test6() throws IOException{ 
        Charset cs1 = Charset.forName("GBK");
    
        //获取编码器
        CharsetEncoder ce = cs1.newEncoder();
    
        //获取解码器
        CharsetDecoder cd = cs1.newDecoder();
    
        CharBuffer cBuf = CharBuffer.allocate(1024);
        cBuf.put("尚硅谷威武！");
        cBuf.flip();
    
        //编码
        ByteBuffer bBuf = ce.encode(cBuf);
    
        for (int i = 0; i < 12; i++) { 
          System.out.println(bBuf.get());
        }
    
        //解码
        bBuf.flip();
        CharBuffer cBuf2 = cd.decode(bBuf);
        System.out.println(cBuf2.toString());
    
        System.out.println("------------------------------------------------------");
    
        Charset cs2 = Charset.forName("GBK");
        bBuf.flip();
        CharBuffer cBuf3 = cs2.decode(bBuf);
        System.out.println(cBuf3.toString());
      }
    
      @Test
      public void test5(){ 
        Map<String, Charset> map = Charset.availableCharsets();
    
        Set<Entry<String, Charset>> set = map.entrySet();
    
        for (Entry<String, Charset> entry : set) { 
          System.out.println(entry.getKey() + "=" + entry.getValue());
        }
      }
    
      //分散和聚集
      @Test
      public void test4() throws IOException{ 
        RandomAccessFile raf1 = new RandomAccessFile("1.txt", "rw");
    
        //1. 获取通道
        FileChannel channel1 = raf1.getChannel();
    
        //2. 分配指定大小的缓冲区
        ByteBuffer buf1 = ByteBuffer.allocate(100);
        ByteBuffer buf2 = ByteBuffer.allocate(1024);
    
        //3. 分散读取
        ByteBuffer[] bufs = { buf1, buf2};
        channel1.read(bufs);
    
        for (ByteBuffer byteBuffer : bufs) { 
          byteBuffer.flip();
        }
    
        System.out.println(new String(bufs[0].array(), 0, bufs[0].limit()));
        System.out.println("-----------------");
        System.out.println(new String(bufs[1].array(), 0, bufs[1].limit()));
    
        //4. 聚集写入
        RandomAccessFile raf2 = new RandomAccessFile("2.txt", "rw");
        FileChannel channel2 = raf2.getChannel();
    
        channel2.write(bufs);
      }
    
      //通道之间的数据传输(直接缓冲区)
      @Test
      public void test3() throws IOException{ 
        FileChannel inChannel = FileChannel.open(Paths.get("d:/1.mkv"), StandardOpenOption.READ);
        FileChannel outChannel = FileChannel.open(Paths.get("d:/2.mkv"), StandardOpenOption.WRITE, StandardOpenOption.READ, StandardOpenOption.CREATE);
    
    // inChannel.transferTo(0, inChannel.size(), outChannel);
        outChannel.transferFrom(inChannel, 0, inChannel.size());
    
        inChannel.close();
        outChannel.close();
      }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 16]

### 通道（Channel）最主要实现类 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 17]

### 获取通道方法 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 18]

### 通道的数据传输 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 19]

# NIO 的非阻塞式网络通信 #

## 阻塞与非阻塞区别 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 20]

## 选择器（Selector） ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 21]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 22]

### 选择器（Selector）的应用 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 23]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 24]

#### SelectionKey ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 25]

### Selector 的常用方法 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 26]

## SocketChannel ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 27]  
![在这里插入图片描述][20210622145327298.png]

## DatagramChannel ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 28]

### 非阻塞模式NIO代码示例 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbmdzaGVuZ3dlaTIzMDYxMg_size_16_color_FFFFFF_t_70 29]

#### tcp ####

package com.nio.demo;
    
    import org.junit.Test;
    
    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.Date;
    import java.util.Iterator;
    import java.util.Scanner;
    import java.util.concurrent.TimeUnit;
    
    /** * 一、使用 NIO 完成网络通信的三个核心： * * 1. 通道（Channel）：负责连接 * * java.nio.channels.Channel 接口： * |--SelectableChannel * |--SocketChannel * |--ServerSocketChannel * |--DatagramChannel * * |--Pipe.SinkChannel * |--Pipe.SourceChannel * * 2. 缓冲区（Buffer）：负责数据的存取 * * 3. 选择器（Selector）：是 SelectableChannel 的多路复用器。用于监控 SelectableChannel 的 IO 状况 * */
    public class TestNonBlockingNIO { 
    	
    	//客户端
    	@Test
    	public void client() throws IOException, InterruptedException { 
    		//1. 获取通道
    		SocketChannel sChannel = SocketChannel.open(new InetSocketAddress("127.0.0.1", 9898));
    		
    		//2. 切换非阻塞模式
    		sChannel.configureBlocking(false);
    		
    		//3. 分配指定大小的缓冲区
    		ByteBuffer buf = ByteBuffer.allocate(1024);
    		
    		//4. 发送数据给服务端
    
    		int i=0;
    		while(i<100){ 
    			//数据写入缓冲区
    			buf.put((new Date().toString() + "\n" + " client "+i).getBytes());
    			//缓冲区切换为读模式
    			buf.flip();
    			//写入缓冲区并发送到服务端
    			sChannel.write(buf);
    			buf.clear();
    			i++;
    			TimeUnit.SECONDS.sleep(1);
    		}
    		
    		//5. 关闭通道
    		sChannel.close();
    	}
    
    	//服务端
    	@Test
    	public void server() throws IOException{ 
    		//1. 获取通道
    		ServerSocketChannel ssChannel = ServerSocketChannel.open();
    		
    		//2. 切换非阻塞模式
    		ssChannel.configureBlocking(false);
    		
    		//3. 绑定连接
    		ssChannel.bind(new InetSocketAddress(9898));
    		
    		//4. 获取选择器
    		Selector selector = Selector.open();
    		
    		//5. 将通道注册到选择器上, 并且指定“监听接收事件”
    		ssChannel.register(selector, SelectionKey.OP_ACCEPT);
    		
    		//6. 轮询式的获取选择器上已经“准备就绪”的事件
    		while(selector.select() > 0){ 
    			
    			//7. 获取当前选择器中所有注册的“选择键(已就绪的监听事件)”
    			Iterator<SelectionKey> it = selector.selectedKeys().iterator();
    			
    			while(it.hasNext()){ 
    				//8. 获取准备“就绪”的是事件
    				SelectionKey sk = it.next();
    				
    				//9. 判断具体是什么事件准备就绪
    				if(sk.isAcceptable()){ 
    					//10. 若“接收就绪”，获取客户端连接
    					SocketChannel sChannel = ssChannel.accept();
    					
    					//11. 切换非阻塞模式
    					sChannel.configureBlocking(false);
    					
    					//12. 将该通道注册到选择器上，并监控读就绪状态
    					sChannel.register(selector, SelectionKey.OP_READ);
    				}else if(sk.isReadable()){ 
    					//13. 获取当前选择器上“读就绪”状态的通道
    					SocketChannel sChannel = (SocketChannel) sk.channel();
    					
    					//14. 读取数据
    					ByteBuffer buf = ByteBuffer.allocate(1024);
    					
    					int len = 0;
    					while((len = sChannel.read(buf)) > 0 ){ 
    						buf.flip();
    						System.out.println(new String(buf.array(), 0, len));
    						buf.clear();
    					}
    				}
    				
    				//15. 取消选择键 SelectionKey
    				it.remove();
    			}
    		}
    	}
    }

#### udp ####

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