day20【NIO、AIO】

其他 2020-03-31 00:01:05 阅读次数: 0

day20【NIO、AIO】

反馈和复习
NIO
1.Buffer --> ByteBuffer
    构造方法:
		public static allocate(int 字节数);
		public static allocatDirect(int 字节数);
		public static wrap(byte[] bs);
	成员方法:
		put(byte b/byte[] bs/byte[] bs,int startIndex,int len); //向缓冲区添加数据
		position([int newPosition]);//获取或者修改当前索引
		limit([int newLimit]);//获取或者修改当前限制
		capacity(); //获取缓冲区的容量
		clear();//清空缓冲区
		flip();//切换模式
		mark(); //记录当前的postion
		reset();//将当前的position更改到mark的位置
		...
2.Chanel
        FileChinnel 文件通道
        SocketChannel 客户端通道
            	SocketChannel socketChannel = SocketChannel.open();
				//默认是阻塞式连接
				//可以通过以下代码修改
				socketChannel.configureBlocking(false);//修改为非阻塞连接
				socketChannel.connect(new InetSockerAddress("服务器IP",服务器端口号));
            
        ServerSocketChannel 服务器通道  
            	ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
				serverSocketChannel.bind(new InetSocketAddress(服务器自己运行的端口号));
				//默认也是阻塞的
				//可以通过以下代码修改
				serverSocketChannel.configureBlocking(false);//修改为非阻塞连接
				SocketChannel socketChannel = serverSocketChannel.accept(); //接收客户端通道
今日内容
1.NIO的Buffer,Channel,Selector(选择器,多路复用器)
2.AIO是异步非阻塞IO

第一章 Select(选择器,多路复用器)(了解)

1.1 多路复用的概念
多路: 多个服务器分别去监听多个端口!
如果多路不复用,每个服务器都需要开启一个线程(在高并发下性能较差)
如果多路复用,可以把多个服务器注册到一个Selector(选择器)上,只需要开启一个线程即可处理这些服务器(在高并发性能较高)
1.2 选择器Selector

  • 什么是Selector

    Selector称为选择器,也叫多路复用器,他可以让多个Channel注册给他,然后监听各个Channel发生的事件

  • Selector的创建API

    a.创建Selector的方式
    Selector selector = Selector.open();

  • Channel注册到Selector的API

    b.将我们要交给选择器管理的通道注册到选择器里
    channel是一个通道,并且必须是非阻塞的通道
    SelectionKey key = channel.register(selector,SelectionKey.OP_ACCEPT);
	参数1: 该通道注册到的选择器对象
    参数2: 表示我们选择器对何种事件感兴趣(服务器通道只能写SelectionKey.OP_ACCEPT,表示有客户端连接)
        
	返回值: SelectionKey是对象,该对象中包含注册到选择器的通道

  • 代码演示

    public class SelectorDemo01 {
    public static void main(String[] args) throws IOException {
        //1.多路(多个服务器监听多个端口)
        ServerSocketChannel server1 = ServerSocketChannel.open();
        server1.configureBlocking(false); //一定要改为非阻塞
        server1.bind(new InetSocketAddress(7777));

        ServerSocketChannel server2 = ServerSocketChannel.open();
        server2.configureBlocking(false); //一定要改为非阻塞
        server2.bind(new InetSocketAddress(8888));

        ServerSocketChannel server3 = ServerSocketChannel.open();
        server3.configureBlocking(false); //一定要改为非阻塞
        server3.bind(new InetSocketAddress(9999));

        //2.获取Selector选择器对象
        Selector selector = Selector.open();

        //3.将多个server注册到同一个Selector上
        se,那么rver1.register(selector, SelectionKey.OP_ACCEPT);
        server2.register(selector, SelectionKey.OP_ACCEPT);
        server3.register(selector, SelectionKey.OP_ACCEPT);
    }
}
1.3 Selector中的常用方法
a.获取所有注册到当前选择器的通道集合
   public Set<SelectionKey> keys();
b.获取所有已经有客户端连接的通道集合
   public Set<SelectionKey> selectedKeys();
c. 如果目前没有客户端连接,那么该方法会阻塞,如果有客户端连接,会返回"本次"连接的客户端数量
   public int select();
1.4 Selector实现多路连接(上)
public class SelectorDemo02 {
    public static void main(String[] args) throws IOException {
        //1.多路(多个服务器监听多个端口)
        ServerSocketChannel server1 = ServerSocketChannel.open();
        server1.configureBlocking(false); //一定要改为非阻塞
        server1.bind(new InetSocketAddress(7777));

        ServerSocketChannel server2 = ServerSocketChannel.open();
        server2.configureBlocking(false); //一定要改为非阻塞
        server2.bind(new InetSocketAddress(8888));

        ServerSocketChannel server3 = ServerSocketChannel.open();
        server3.configureBlocking(false); //一定要改为非阻塞
        server3.bind(new InetSocketAddress(9999));

        //2.获取Selector选择器对象
        Selector selector = Selector.open();

        //3.将多个server注册到同一个Selector上
        server1.register(selector, SelectionKey.OP_ACCEPT);
        server2.register(selector, SelectionKey.OP_ACCEPT);
        server3.register(selector, SelectionKey.OP_ACCEPT);

        //4.接收客户端连接
        Set<SelectionKey> keys = selector.keys();//获取已注册通道的集合
        System.out.println("注册通道数量：" + keys.size());
        Set<SelectionKey> selectionKeys = selector.selectedKeys();//获取已连接通 道的集合
        System.out.println("已连接通道数量:" + selectionKeys.size());
        System.out.println("----------------------------------------------");
        System.out.println("【服务器】等待连接......");
        int selectedCount = selector.select();//此方法会"阻塞"
        System.out.println("本次连接数量：" + selectedCount);
        System.out.println("----------------------------------------------");
        Set<SelectionKey> keys1 = selector.keys();
        System.out.println("注册通道数量：" + keys1.size());
        Set<SelectionKey> selectionKeys1 = selector.selectedKeys();
        System.out.println("已连接的通道数量：" + selectionKeys1.size());
    }
}

public class SocketChannelDemo {
    public static void main(String[] args) {

        new Thread(() -> {
            try (SocketChannel socket = SocketChannel.open()) {
                System.out.println("7777客户端连接服务器......");
                socket.connect(new InetSocketAddress("127.0.0.1", 7777));
                System.out.println("7777客户端连接成功....");
            } catch (IOException e) {
                System.out.println("7777异常重连");
            }
        }).start();


        new Thread(() -> {
            try (SocketChannel socket = SocketChannel.open()) {
                System.out.println("8888客户端连接服务器......");
                socket.connect(new InetSocketAddress("127.0.0.1", 8888));
                System.out.println("8888客户端连接成功....");
            } catch (IOException e) {
                System.out.println("8888异常重连");
            }
        }).start();


        new Thread(() -> {
            try (SocketChannel socket = SocketChannel.open()) {
                System.out.println("9999客户端连接服务器......");
                socket.connect(new InetSocketAddress("127.0.0.1", 9999));
                System.out.println("9999客户端连接成功....");
            } catch (IOException e) {
                System.out.println("9999异常重连");
            }
        }).start();
    }
}
1.5 Selector实现多路连接(下)
public class SelectorDemo02 {
    public static void main(String[] args) throws IOException, InterruptedException {
        //1.多路(多个服务器监听多个端口)
        ServerSocketChannel server1 = ServerSocketChannel.open();
        server1.configureBlocking(false); //一定要改为非阻塞
        server1.bind(new InetSocketAddress(7777));

        ServerSocketChannel server2 = ServerSocketChannel.open();
        server2.configureBlocking(false); //一定要改为非阻塞
        server2.bind(new InetSocketAddress(8888));

        ServerSocketChannel server3 = ServerSocketChannel.open();
        server3.configureBlocking(false); //一定要改为非阻塞
        server3.bind(new InetSocketAddress(9999));

        //2.获取Selector选择器对象
        Selector selector = Selector.open();

        //3.将多个server注册到同一个Selector上
        server1.register(selector, SelectionKey.OP_ACCEPT);
        server2.register(selector, SelectionKey.OP_ACCEPT);
        server3.register(selector, SelectionKey.OP_ACCEPT);

        //4.接收客户端连接
        Set<SelectionKey> keys = selector.keys();//获取已注册通道的集合
        System.out.println("注册通道数量：" + keys.size());
        Set<SelectionKey> selectionKeys = selector.selectedKeys();//获取已连接通 道的集合
        System.out.println("已连接通道数量:" + selectionKeys.size());
        System.out.println("----------------------------------------------");
        while (true) {
            System.out.println("【服务器】等待连接......");
            int selectedCount = selector.select();//此方法会"阻塞"
            System.out.println("本次连接数量：" + selectedCount);
            System.out.println("----------------------------------------------");
            Set<SelectionKey> keys1 = selector.keys();
            System.out.println("注册通道数量：" + keys1.size());
            Set<SelectionKey> selectionKeys1 = selector.selectedKeys();
            System.out.println("已连接的通道数量：" + selectionKeys1.size());

            System.out.println("============处理被连接的服务器通道============");
            //遍历已连接通道的集合
            Iterator<SelectionKey> it = selectionKeys1.iterator();
            while (it.hasNext()) {
                //获取当前连接通道的
                SelectionKey key = it.next();
                //从SelectionKey中获取通道对象
                ServerSocketChannel channel = (ServerSocketChannel) key.channel();
                //看一下此通道是监听哪个端口的
                System.out.println("监听端口：" + channel.getLocalAddress());
                //取出连接到该服务器的客户端通道
                SocketChannel accept = channel.accept();
                System.out.println(accept);
                System.out.println("写与该客户端进行交互的代码....");
                //从连接的通道中把已经处理过的服务器通道移出
                it.remove();
            }
            System.out.println("休息5秒......");
            Thread.sleep(5000);
            System.out.println();//打印一个空行
        }
    }
}

public class SocketChannelDemo {
    public static void main(String[] args) {

        new Thread(() -> {
            try (SocketChannel socket = SocketChannel.open()) {
                System.out.println("7777客户端连接服务器......");
                socket.connect(new InetSocketAddress("127.0.0.1", 7777));
                System.out.println("7777客户端连接成功....");
            } catch (IOException e) {
                System.out.println("7777异常重连");
            }
        }).start();


        new Thread(() -> {
            try (SocketChannel socket = SocketChannel.open()) {
                System.out.println("8888客户端连接服务器......");
                socket.connect(new InetSocketAddress("127.0.0.1", 8888));
                System.out.println("8888客户端连接成功....");
            } catch (IOException e) {
                System.out.println("8888异常重连");
            }
        }).start();


        new Thread(() -> {
            try (SocketChannel socket = SocketChannel.open()) {
                System.out.println("9999客户端连接服务器......");
                socket.connect(new InetSocketAddress("127.0.0.1", 9999));
                System.out.println("9999客户端连接成功....");
            } catch (IOException e) {
                System.out.println("9999异常重连");
            }
        }).start();
    }
}
1.6 Selector多路信息接收测试
public class SelectorDemo02 {
    public static void main(String[] args) throws IOException, InterruptedException {
        //1.多路(多个服务器监听多个端口)
        ServerSocketChannel server1 = ServerSocketChannel.open();
        server1.configureBlocking(false); //一定要改为非阻塞
        server1.bind(new InetSocketAddress(7777));

        ServerSocketChannel server2 = ServerSocketChannel.open();
        server2.configureBlocking(false); //一定要改为非阻塞
        server2.bind(new InetSocketAddress(8888));

        ServerSocketChannel server3 = ServerSocketChannel.open();
        server3.configureBlocking(false); //一定要改为非阻塞
        server3.bind(new InetSocketAddress(9999));

        //2.获取Selector选择器对象
        Selector selector = Selector.open();

        //3.将多个server注册到同一个Selector上
        server1.register(selector, SelectionKey.OP_ACCEPT);
        server2.register(selector, SelectionKey.OP_ACCEPT);
        server3.register(selector, SelectionKey.OP_ACCEPT);

        //4.接收客户端连接
        Set<SelectionKey> keys = selector.keys();//获取已注册通道的集合
        System.out.println("注册通道数量：" + keys.size());
        Set<SelectionKey> selectionKeys = selector.selectedKeys();//获取已连接通 道的集合
        System.out.println("已连接通道数量:" + selectionKeys.size());
        System.out.println("----------------------------------------------");
        while (true) {
            System.out.println("【服务器】等待连接......");
            int selectedCount = selector.select();//此方法会"阻塞"
            System.out.println("本次连接数量：" + selectedCount);
            System.out.println("----------------------------------------------");
            Set<SelectionKey> keys1 = selector.keys();
            System.out.println("注册通道数量：" + keys1.size());
            Set<SelectionKey> selectionKeys1 = selector.selectedKeys();
            System.out.println("已连接的通道数量：" + selectionKeys1.size());

            System.out.println("============处理被连接的服务器通道============");
            //遍历已连接通道的集合
            Iterator<SelectionKey> it = selectionKeys1.iterator();
            while (it.hasNext()) {
                //获取当前连接通道的
                SelectionKey key = it.next();
                //从SelectionKey中获取通道对象
                ServerSocketChannel channel = (ServerSocketChannel) key.channel();
                //看一下此通道是监听哪个端口的
                System.out.println("监听端口：" + channel.getLocalAddress());
                //取出连接到该服务器的客户端通道
                SocketChannel accept = channel.accept();
                System.out.println("写与该客户端进行交互的代码....");
                //接收客户端发送过来的信息
                ByteBuffer inBuf = ByteBuffer.allocate(1000);
                accept.read(inBuf);
                inBuf.flip();
                String msg = new String(inBuf.array(), 0, inBuf.limit());
                System.out.println("【服务器】接收到通道【" + channel.getLocalAddress() + "】的信息：" + msg);


                //从连接的通道中把已经处理过的服务器通道移出
                it.remove();
            }
            System.out.println("休息5秒......");
            Thread.sleep(5000);
            System.out.println();//打印一个空行
        }
    }
}

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-SVu3Yh5t-1585326473505)(img/image-20200327110057985.png)]

第二章 AIO(异步、非阻塞)(了解)

2.1 AIO概述和分类
什么AIO: ASynchronized 异步非阻塞的IO
AIO的分类:
	异步的文件通道  AsynchronousFileChannel
    异步的客户端通道: AsynchronousSocketChannel
    异步的服务器通道: AsynchronousServerSocketChannel
    异步的UDP协议通道: AsynchronousDatagramChannel
AIO的异步:
	表现两个方面:
		a.连接时,可以使用异步(调用连接的方法时,非阻塞,连接成功之后会以方法回调的机制通知我们)
        b.读写数据时,可以使用异步(调用read方法时,非阻塞,等数据接收到之后以方法调用的机制通知我们)
2.2 AIO 异步非阻塞连接的建立

  • 异步非阻塞的客户端通道

    /**
 * AIO下的 异步客户端通道
 */
public class AIOSocketChannelDemo01 {
    public static void main(String[] args) throws IOException {
        //1.创建 异步的客户端通道
        AsynchronousSocketChannel socketChannel = AsynchronousSocketChannel.open();
        //2.去连接服务器,采用异步非阻塞方法
        //connect(服务器的IP和端口号,附件(null),接口);
        socketChannel.connect(new InetSocketAddress("127.0.0.1", 8888), null, new CompletionHandler<Void, Object>() {
            @Override
            public void completed(Void result, Object attachment) {
                System.out.println("连接服务器成功...");
            }

            @Override
            public void failed(Throwable exc, Object attachment) {
                System.out.println("连接服务器失败...");
            }
        });

        System.out.println("程序继续执行....");

        while (true) {

        }
    }
}

  • 异步非阻塞的服务器通道

    /**
 * AIO下的 异步服务器端通道
 */
public class AIOServerSocketChannelDemo01 {
    public static void main(String[] args) throws IOException, InterruptedException {
        //1.创建一个异步的服务器通道
        AsynchronousServerSocketChannel serverSocketChannel = AsynchronousServerSocketChannel.open();
        //2.绑定本地某个端口
        serverSocketChannel.bind(new InetSocketAddress(8888));
        //3.接收异步客户端,采用异步非阻塞方式
        //accpet(附件(nulll),接口);
        serverSocketChannel.accept(null, new CompletionHandler<AsynchronousSocketChannel, Object>() {
            @Override
            public void completed(AsynchronousSocketChannel result, Object attachment) {
                System.out.println("有客户端连接....");
            }

            @Override
            public void failed(Throwable exc, Object attachment) {
                System.out.println("客户端连接失败...");
            }
        });

        System.out.println("程序继续执行..");

        while (true) {

        }

    }
}

  • 异步非阻塞建立连接

    见AIO异步客户端和AIO异步服务器端建立
2.3 AIO同步读写数据
/**
 * AIO下的 异步客户端通道
 */
public class AIOSocketChannelDemo01 {
    public static void main(String[] args) throws IOException, InterruptedException {
        //1.创建 异步的客户端通道
        AsynchronousSocketChannel socketChannel = AsynchronousSocketChannel.open();
        //2.去连接服务器,采用异步非阻塞方法
        //connect(服务器的IP和端口号,附件(null),接口);
        socketChannel.connect(new InetSocketAddress("127.0.0.1", 8888), null, new CompletionHandler<Void, Object>() {
            @Override
            public void completed(Void result, Object attachment) {
                System.out.println("连接服务器成功...");
                //客户端给服务器发送数据
                ByteBuffer buffer = ByteBuffer.allocate(1024);
                buffer.put("你好我是AIO客户端...".getBytes());
                //切换读写模式
                buffer.flip();
                socketChannel.write(buffer);
                //释放资源
                try {
                    socketChannel.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void failed(Throwable exc, Object attachment) {
                System.out.println("连接服务器失败...");
            }
        });

        System.out.println("程序继续执行....");
    }
}
/**
 * AIO下的 异步服务器端通道
 */
public class AIOServerSocketChannelDemo01 {
    public static void main(String[] args) throws IOException, InterruptedException {
        //1.创建一个异步的服务器通道
        AsynchronousServerSocketChannel serverSocketChannel = AsynchronousServerSocketChannel.open();
        //2.绑定本地某个端口
        serverSocketChannel.bind(new InetSocketAddress(8888));
        //3.接收异步客户端,采用异步非阻塞方式
        //accpet(附件(nulll),接口);
        serverSocketChannel.accept(null, new CompletionHandler<AsynchronousSocketChannel, Object>() {
            @Override
            public void completed(AsynchronousSocketChannel socketChannel, Object attachment) {
                System.out.println("有客户端连接....");
                //去读客户端发送来的数据
                ByteBuffer buffer = ByteBuffer.allocate(1024);
                Future<Integer> future = socketChannel.read(buffer);
//            
                try {
                    byte[] array = buffer.array();
                    System.out.println(Arrays.toString(array));

                    Integer len = future.get();
                    System.out.println(len);
					//当调用future的get方法时,数据才写入到buffer中
                    //所以我们不能在调用get方法之前,调用flip,否则数据将无法写入
                    buffer.flip();
                    System.out.println(new String(array,0,len));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void failed(Throwable exc, Object attachment) {
                System.out.println("客户端连接失败...");
            }
        });

        System.out.println("程序继续执行..");
    }
}
2.4 AIO异步读写数据
/**
 * AIO下的 异步客户端通道
 */
public class AIOSocketChannelDemo01 {
    public static void main(String[] args) throws IOException, InterruptedException {
        //1.创建 异步的客户端通道
        AsynchronousSocketChannel socketChannel = AsynchronousSocketChannel.open();
        //2.去连接服务器,采用异步非阻塞方法
        //connect(服务器的connectIP和端口号,附件(null),接口);
        socketChannel.connect(new InetSocketAddress("127.0.0.1", 8888), null, new CompletionHandler<Void, Object>() {
            @Override
            public void completed(Void result, Object attachment) {
                System.out.println("连接服务器成功...");
                //给服务器发送数据
                ByteBuffer buffer = ByteBuffer.allocate(1000);
                buffer.put("你好我是AIO客户端..".getBytes());
                buffer.flip();
                //异步的write(缓冲区,超时时间,时间单位,附件(null),回调接口);
                socketChannel.write(buffer, 10, TimeUnit.SECONDS, null, new CompletionHandler<Integer, Object>() {
                    @Override
                    public void completed(Integer result, Object attachment) {
                        System.out.println("数据成功发送...");
                        //释放资源
                        try {
                            socketChannel.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void failed(Throwable exc, Object attachment) {
                        System.out.println("数据发送失败...");
                    }
                });


            }

            @Override
            public void failed(Throwable exc, Object attachment) {
                System.out.println("连接服务器失败...");
            }
        });

        System.out.println("程序继续执行....");
        Thread.sleep(5000);
    }
}


/**
 * AIO下的 异步服务器端通道
 */
public class AIOServerSocketChannelDemo01 {
    public static void main(String[] args) throws IOException, InterruptedException {
        //1.创建一个异步的服务器通道
        AsynchronousServerSocketChannel serverSocketChannel = AsynchronousServerSocketChannel.open();
        //2.绑定本地某个端口
        serverSocketChannel.bind(new InetSocketAddress(8888));
        //3.接收异步客户端,采用异步非阻塞方式
        //accpet(附件(nulll),接口);
        serverSocketChannel.accept(null, new CompletionHandler<AsynchronousSocketChannel, Object>() {
            @Override
            public void completed(AsynchronousSocketChannel socketChannel, Object attachment) {
                System.out.println("有客户端连接....");
                //从客户端中读取数据
                //异步的read(字节缓冲区,超时时间,时间单位,附件(null),回调接口)
                ByteBuffer buffer = ByteBuffer.allocate(1000);
                socketChannel.read(buffer, 10, TimeUnit.SECONDS, null, new CompletionHandler<Integer, Object>() {
                    @Override
                    public void completed(Integer result, Object attachment) {
                        System.out.println("数据读取完毕..");
                        System.out.println("接收到数据的长度:"+result);
                        System.out.println("接收到的数据是:" + new String(buffer.array(), 0, result));
                        //释放资源
                        try {
                            socketChannel.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void failed(Throwable exc, Object attachment) {
                        System.out.println("读取数据失败...");
                    }
                });
            }

            @Override
            public void failed(Throwable exc, Object attachment) {
                System.out.println("客户端连接失败...");
            }
        });

        System.out.println("程序继续执行..");
        while (true) {
            Thread.sleep(1000);
        }

    }
}
总结
能够说出Selector选择器的作用
    Selector可以让多个服务器注册到它上,完成多路复用的功能!!
能够使用Selector选择器
    注册:
		通道.register(selector,SelectionKey.OP_ACCEPT);
	方法:
		Set<SelectionKey> keys = selector.selectedKeys(); //获取被连接的服务器通道的集合
		Set<SelectionKey> keys = selector.keys();//获取所有注册到选择器的服务器通道集合

		int count = selector.select();//获取本次被客户端通道连接的服务器通道的数量
能够说出AIO的特点
    特点:
	a.支持异步非阻塞连接 connect accept
    b.支持异步非阻塞的读写数据
        		socketChannel.write(....);
				socketChannel.read(....);

今日没有作业:
	a.前面知识学得不好的,复习前面的内容(Map遍历,斗地主案例,学生管理系统,TCP双向通信)
    b.前面知识嗷嗷的,没问题,你可以研究NIO和AIO
编程叮当猫
发布了23 篇原创文章 · 获赞 0 · 访问量 1131
私信 关注

猜你喜欢

转载自blog.csdn.net/qq_44845814/article/details/105154144
今日推荐
基于大语言模型的开源知识库问答系统 MaxKB GitHub Star 数量突破 5,000 个！
美国拟限制 AI 大模型出口中国和俄罗斯
苹果将与 OpenAI 达成协议，将 ChatGPT 应用于 iPhone
openKylin 社区生态委员会第六次会议圆满召开
阿里云正式发布通义千问 2.5
Python 3.13 发布首个 Beta：实验性自由线程模式和 JIT、改进交互式解释器
Stack Overflow 拿我的代码去训练 AI 大模型，还封了我的账号
Pop!_OS 的 COSMIC 桌面完成 App Store 上架工作
《2024 年一季度互联网投融资运行情况》研究报告
报告：Django 仍然是 74% 开发者的首选
15 年前上了“FFmpeg 耻辱柱”，今天他还得谢谢咱——腾讯QQPlayer一雪前耻？
TIOBE 5 月榜单：Fortran “复活”进入 Top 10
周排行
记一下去大梅沙的准备（2018-05-26）
Spring 注解 事务
基于HTTP协议的客户端缓存
阿里云rds 备份和还原
[PHP] 几个拖慢 PHP 程序/API 运行速度的点
python 代码风格------------PEP8规则
js控制json生成菜单——自制菜单（一）
将字符串: 'k:1|k1:2|k2:3|k3:4 ' ,处理成 python 字典: {'k':1, 'k1':2, ...}
微信小程序转支付宝小程序
Qt551.窗口滚动条
每日归档
更多
2024-05-13(18)
2024-05-12(0)
2024-05-11(38)
2024-05-10(38)
2024-05-09(35)
2024-05-08(42)
2024-05-07(14)
2024-05-06(40)
2024-05-05(0)
2024-05-04(7)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022