1.NIO
1.1 NIO通道客户端【应用】
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客户端实现步骤
- 打开通道
- 指定IP和端口号
- 写出数据
- 释放资源
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示例代码
public class NIOClient {public static void main(String[] args) throws IOException {//1.打开通道SocketChannel socketChannel = SocketChannel.open();//2.指定IP和端口号socketChannel.connect(new InetSocketAddress("127.0.0.1",10000));//3.写出数据ByteBuffer byteBuffer = ByteBuffer.wrap("一点寒毛先制".getBytes());socketChannel.write(byteBuffer);//4.释放资源socketChannel.close();} }
1.2 NIO通道服务端【应用】
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NIO通道
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服务端通道
只负责建立建立,不负责传递数据
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客户端通道
建立建立并将数据传递给服务端
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缓冲区
客户端发送的数据都在缓冲区中
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服务端通道内部创建出来的客户端通道
相当于客户端通道的延伸用来传递数据
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服务端实现步骤
- 打开一个服务端通道
- 绑定对应的端口号
- 通道默认是阻塞的,需要设置为非阻塞
- 此时没有门卫大爷,所以需要经常看一下有没有连接发过来没?
- 如果有客户端来连接了,则在服务端通道内部,再创建一个客户端通道,相当于是客户端通道的延伸
- 获取客户端传递过来的数据,并把数据放在byteBuffer1这个缓冲区中
- 给客户端回写数据
- 释放资源
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示例代码
public class NIOServer {public static void main(String[] args) throws IOException { // 1.打开一个服务端通道ServerSocketChannel serverSocketChannel = ServerSocketChannel.open(); // 2.绑定对应的端口号serverSocketChannel.bind(new InetSocketAddress(10000)); // 3.通道默认是阻塞的,需要设置为非阻塞//如果传递true 表示通道设置为阻塞通道...默认值//如果传递false 表示通道设置为非阻塞通道serverSocketChannel.configureBlocking(false); // 4.此时没有门卫大爷,所以需要经常看一下有没有连接发过来没?while (true) { // 5.如果有客户端来连接了,则在服务端通道内部,再创建一个客户端通道,相当于是客户端通道的延伸//此时已经设置了通道为非阻塞//所以在调用方法的时候,如果有客户端来连接,那么会创建一个SocketChannel对象.//如果在调用方法的时候,没有客户端来连接,那么他会返回一个nullSocketChannel socketChannel = serverSocketChannel.accept();//System.out.println(socketChannel);if(socketChannel != null){ // 6.客户端将缓冲区通过通道传递给服务端,就到了这个延伸通道socketChannel里面 // 7.服务端创建一个空的缓冲区装数据并输出ByteBuffer byteBuffer = ByteBuffer.allocate(1024);//获取传递过来的数据,并把他们放到byteBuffer缓冲区中.//返回值://正数: 表示本次读到的有效字节个数.//0 : 表示本次没有读到有效字节.//-1 : 表示读到了末尾int len = socketChannel.read(byteBuffer);System.out.println(new String(byteBuffer.array(),0,len));//8.释放资源socketChannel.close();}}} }
1.3 NIO通道练习【应用】
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客户端
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实现步骤
- 打开通道
- 指定IP和端口号
- 写出数据
- 读取服务器写回的数据
- 释放资源
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示例代码
public class Clinet {public static void main(String[] args) throws IOException {// 1.打开通道SocketChannel socketChannel = SocketChannel.open();// 2.指定IP和端口号socketChannel.connect(new InetSocketAddress("127.0.0.1",10000));// 3.写出数据ByteBuffer byteBuffer1 = ByteBuffer.wrap("吃俺老孙一棒棒".getBytes());socketChannel.write(byteBuffer1);// 手动写入结束标记socketChannel.shutdownOutput();System.out.println("数据已经写给服务器");// 4.读取服务器写回的数据ByteBuffer byteBuffer2 = ByteBuffer.allocate(1024);int len;while((len = socketChannel.read(byteBuffer2)) != -1){byteBuffer2.flip();System.out.println(new String(byteBuffer2.array(),0,len));byteBuffer2.clear();}// 5.释放资源socketChannel.close();} }
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服务端
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实现步骤
- 打开一个服务端通道
- 绑定对应的端口号
- 通道默认是阻塞的,需要设置为非阻塞
- 此时没有门卫大爷,所以需要经常看一下有没有连接发过来没?
- 如果有客户端来连接了,则在服务端通道内部,再创建一个客户端通道,相当于是客户端通道的延伸
- 获取客户端传递过来的数据,并把数据放在byteBuffer1这个缓冲区中
- 给客户端回写数据
- 释放资源
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示例代码
public class Sever {public static void main(String[] args) throws IOException {// 1,打开一个服务端通道ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();// 2,绑定对应的端口号serverSocketChannel.bind(new InetSocketAddress(10000));// 3,通道默认是阻塞的,需要设置为非阻塞serverSocketChannel.configureBlocking(false);// 4,此时没有门卫大爷,所以需要经常看一下有没有连接发过来没?while(true){// 5,如果有客户端来连接了,则在服务端通道内部,再创建一个客户端通道,相当于是客户端通道的延伸SocketChannel socketChannel = serverSocketChannel.accept();if(socketChannel != null){System.out.println("此时有客户端来连接了");// 6,获取客户端传递过来的数据,并把数据放在byteBuffer1这个缓冲区中ByteBuffer byteBuffer1 = ByteBuffer.allocate(1024);//socketChannel.read(byteBuffer1);int len;//针对于缓冲区来讲//如果 从添加数据 ----> 获取数据 flip//如果 从获取数据 ----> 添加数据 clearwhile((len = socketChannel.read(byteBuffer1)) != -1){byteBuffer1.flip();System.out.println(new String(byteBuffer1.array(),0,len));byteBuffer1.clear();}System.out.println("接收数据完毕,准备开始往客户端回写数据");// 7,给客户端回写数据ByteBuffer byteBuffer2 = ByteBuffer.wrap("哎哟,真疼啊!!!".getBytes());socketChannel.write(byteBuffer2);// 8,释放资源socketChannel.close();}}} }
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1.4 NIO通道练习优化【应用】
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存在问题
服务端内部获取的客户端通道在读取时,如果读取不到结束标记就会一直阻塞
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解决方案
将服务端内部获取的客户端通道设置为非阻塞的
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示例代码
// 客户端 public class Clinet {public static void main(String[] args) throws IOException {SocketChannel socketChannel = SocketChannel.open();socketChannel.connect(new InetSocketAddress("127.0.0.1",10000));ByteBuffer byteBuffer1 = ByteBuffer.wrap("吃俺老孙一棒棒".getBytes());socketChannel.write(byteBuffer1);System.out.println("数据已经写给服务器");ByteBuffer byteBuffer2 = ByteBuffer.allocate(1024);int len;while((len = socketChannel.read(byteBuffer2)) != -1){System.out.println("客户端接收回写数据");byteBuffer2.flip();System.out.println(new String(byteBuffer2.array(),0,len));byteBuffer2.clear();}socketChannel.close();} } // 服务端 public class Sever {public static void main(String[] args) throws IOException {ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();serverSocketChannel.bind(new InetSocketAddress(10000));serverSocketChannel.configureBlocking(false);while(true){SocketChannel socketChannel = serverSocketChannel.accept();if(socketChannel != null){System.out.println("此时有客户端来连接了");// 将服务端内部获取的客户端通道设置为非阻塞的socketChannel.configureBlocking(false);//获取客户端传递过来的数据,并把数据放在byteBuffer1这个缓冲区中ByteBuffer byteBuffer1 = ByteBuffer.allocate(1024);//socketChannel.read(byteBuffer1);int len;//针对于缓冲区来讲//如果 从添加数据 ----> 获取数据 flip//如果 从获取数据 ----> 添加数据 clearwhile((len = socketChannel.read(byteBuffer1)) > 0){System.out.println("服务端接收发送数据");byteBuffer1.flip();System.out.println(new String(byteBuffer1.array(),0,len));byteBuffer1.clear();}System.out.println("接收数据完毕,准备开始往客户端回写数据");ByteBuffer byteBuffer2 = ByteBuffer.wrap("哎哟,真疼啊!!!".getBytes());socketChannel.write(byteBuffer2);socketChannel.close();}}} }
1.5NIO选择器【理解】
-
概述
选择器可以监视通道的状态,多路复用
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选择器对象
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Selector
选择器对象
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SelectionKey
绑定的key
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SelectableChannel
能使用选择器的通道
- SocketChannel
- ServerSocketChannel
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1.6NIO选择器改写服务端【应用】
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实现步骤
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打开一个服务端通道(open)
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绑定对应的端口号
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通道默认是阻塞的,需要设置为非阻塞
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打开一个选择器(门卫大爷)
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将选择器绑定服务端通道,并监视服务端是否准备好
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如果有客户端来连接了,大爷会遍历所有的服务端通道,谁准备好了,就让谁来连接
连接后,在服务端通道内部,再创建一个客户端延伸通道 -
如果客户端把数据传递过来了,大爷会遍历所有的延伸通道,谁准备好了,谁去接收数据
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代码实现
// 客户端 public class Clinet {public static void main(String[] args) throws IOException {SocketChannel socketChannel = SocketChannel.open();socketChannel.connect(new InetSocketAddress("127.0.0.1",10000));ByteBuffer byteBuffer1 = ByteBuffer.wrap("吃俺老孙一棒棒".getBytes());socketChannel.write(byteBuffer1);System.out.println("数据已经写给服务器");ByteBuffer byteBuffer2 = ByteBuffer.allocate(1024);int len;while((len = socketChannel.read(byteBuffer2)) != -1){System.out.println("客户端接收回写数据");byteBuffer2.flip();System.out.println(new String(byteBuffer2.array(),0,len));byteBuffer2.clear();}socketChannel.close();} } // 服务端 public class Server {public static void main(String[] args) throws IOException {//1.打开服务端通道ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();//2.让这个通道绑定一个端口serverSocketChannel.bind(new InetSocketAddress(10000));//3.设置通道为非阻塞serverSocketChannel.configureBlocking(false);//4.打开一个选择器//Selector --- 选择器 // SelectionKey --- 绑定通道后返回那个令牌// SelectableChannel --- 可以使用选择器的通道Selector selector = Selector.open();//5.绑定选择器和服务端通道serverSocketChannel.register(selector,SelectionKey.OP_ACCEPT);while(true){System.out.println("11");//选择器会监视客户端通道的状态.//6.返回值就表示此时有多少个客户端来连接.int count = selector.select();System.out.println("222");if(count != 0){System.out.println("有客户端来连接了");//7.会遍历所有的服务端通道.看谁准备好了,谁准备好了,就让谁去连接.//获取所有服务端通道的令牌,并将它们都放到一个集合中,将集合返回.Set<SelectionKey> selectionKeys = selector.selectedKeys();Iterator<SelectionKey> iterator = selectionKeys.iterator();while(iterator.hasNext()){//selectionKey 依次表示每一个服务端通道的令牌SelectionKey selectionKey = iterator.next();if(selectionKey.isAcceptable()){//可以通过令牌来获取到了一个已经就绪的服务端通道ServerSocketChannel ssc = (ServerSocketChannel) selectionKey.channel();//客户端的延伸通道SocketChannel socketChannel = ssc.accept();//将客户端延伸通道设置为非阻塞的socketChannel.configureBlocking(false);socketChannel.register(selector,SelectionKey.OP_READ);//当客户端来连接的时候,所有的步骤已经全部执行完毕.}else if(selectionKey.isReadable()){//当前通道已经做好了读取的准备(延伸通道)SocketChannel socketChannel = (SocketChannel) selectionKey.channel();ByteBuffer byteBuffer1 = ByteBuffer.allocate(1024);//socketChannel.read(byteBuffer1);int len;while((len = socketChannel.read(byteBuffer1)) > 0){byteBuffer1.flip();System.out.println(new String(byteBuffer1.array(),0,len));byteBuffer1.clear();}//给客户端的回写数据socketChannel.write(ByteBuffer.wrap("哎哟喂好疼啊!!!".getBytes()));socketChannel.close();}iterator.remove();}}}} }
2.HTTP协议
2.1概述【理解】
超文本传输协议(关于超文本的概念JavaWeb在进行学习),是建立在TCP/IP协议基础上,是网络应用层的协议。
由请求和响应构成,是一个标准的客户端和服务器模型
2.2URL【理解】
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概述
统一资源定位符,常见的如http://bbs.itxxx.com/forum.php
完整的格式为 http://bbs.itxxx.com:80/forum.php
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详解
2.3抓包工具的使用【应用】
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使用步骤
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在谷歌浏览器网页中按F12 或者网页空白处右键,点击检查,可以调出工具
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点击network,进入到查看网络相关信息界面
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这时在浏览器中发起请求,进行访问,工具中就会显示出请求和响应相关的信息
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2.4请求信息【理解】
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组成
- 请求行
- 请求头
- 请求空行
- 请求体
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请求行
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格式
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请求方式
GET,POST,HEAD,PUT,DELETE,CONNECT,OPTIONS,TRACE,PATCH
其中用的比较多的是GET和POST
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URI
请求资源路径,统一资源标识符
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协议版本
- HTTP1.0: 每次请求和响应都需要建立一个单独的连接
- HTTP1.1:支持长连接
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请求头
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格式
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请求头名称
- Host: 用来指定请求的服务端地址
- Connection: 取值为keep-alive表示需要持久连接
- User-Agent: 客户端的信息
- Accept: 指定客户端能够接收的内容类型
- Accept-Encoding: 指定浏览器可以支持的服务器返回内容压缩编码类型
- Accept-Language: 浏览器可接受的语言
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小结
2.5响应信息【理解】
-
组成
- 响应行
- 响应头
- 响应空行
- 响应体
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响应行
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格式
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协议版本
- HTTP1.0: 每次请求和响应都需要建立一个单独的连接
- HTTP1.1: 支持长连接
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响应状态码
- 1xx: 指示信息(表示请求已接收,继续处理)
- 2xx: 成功(表示请求已被成功接收、理解、接受)
- 3xx: 请求重定向(要完成请求必须进行更进一步的操作)
- 4xx: 客户端错误(请求有语法错误或请求无法实现)
- 5xx: 服务器端错误(服务器未能实现合法的请求)
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状态信息
- 200 ok
- 404 Not Found
- 500 Internal Server Error
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响应头
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响应头名称
- Content-Type: 告诉客户端实际返回内容的网络媒体类型(互联网媒体类型,也叫做MIME类型)
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响应头值
- text/html ----> 文本类型
- image/png ----> png格式文件
- image/jpeg ----> jpg格式文件
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-
小结
3.HTTP服务器
3.1需求【理解】
- 编写服务器端代码,实现可以解析浏览器的请求,给浏览器响应数据
3.2环境搭建【理解】
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实现步骤
- 编写HttpServer类,实现可以接收浏览器发出的请求
- 其中获取连接的代码可以单独抽取到一个类中
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代码实现
// 服务端代码 public class HttpServer {public static void main(String[] args) throws IOException {//1.打开服务端通道ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();//2.让这个通道绑定一个端口serverSocketChannel.bind(new InetSocketAddress(10000));//3.设置通道为非阻塞serverSocketChannel.configureBlocking(false);//4.打开一个选择器Selector selector = Selector.open();//5.绑定选择器和服务端通道serverSocketChannel.register(selector,SelectionKey.OP_ACCEPT);while(true){//6.选择器会监视通道的状态.int count = selector.select();if(count != 0){//7.会遍历所有的服务端通道.看谁准备好了,谁准备好了,就让谁去连接.//获取所有服务端通道的令牌,并将它们都放到一个集合中,将集合返回.Set<SelectionKey> selectionKeys = selector.selectedKeys();Iterator<SelectionKey> iterator = selectionKeys.iterator();while(iterator.hasNext()){//selectionKey 依次表示每一个服务端通道的令牌SelectionKey selectionKey = iterator.next();if(selectionKey.isAcceptable()){//获取连接AcceptHandler acceptHandler = new AcceptHandler();acceptHandler.connSocketChannel(selectionKey);}else if(selectionKey.isReadable()){}//任务处理完毕以后,将SelectionKey从集合中移除iterator.remove();}}}} } // 将获取连接的代码抽取到这个类中 public class AcceptHandler {public SocketChannel connSocketChannel(SelectionKey selectionKey){try {//获取到已经就绪的服务端通道ServerSocketChannel ssc = (ServerSocketChannel) selectionKey.channel();SocketChannel socketChannel = ssc.accept();//设置为非阻塞状态socketChannel.configureBlocking(false);//把socketChannel注册到选择器上socketChannel.register(selectionKey.selector(), SelectionKey.OP_READ);return socketChannel;} catch (IOException e) {e.printStackTrace();}return null;} }
3.3获取请求信息并解析【理解】
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实现步骤
- 将请求信息封装到HttpRequest类中
- 在类中定义方法,实现获取请求信息并解析
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代码实现
/*** 用来封装请求数据的类*/ public class HttpRequest {private String method; //请求方式private String requestURI; //请求的uriprivate String version; //http的协议版本private HashMap<String,String> hm = new HashMap<>();//所有的请求头//parse --- 获取请求数据 并解析public void parse(SelectionKey selectionKey){try {SocketChannel socketChannel = (SocketChannel) selectionKey.channel();StringBuilder sb = new StringBuilder();//创建一个缓冲区ByteBuffer byteBuffer = ByteBuffer.allocate(1024);int len;//循环读取while((len = socketChannel.read(byteBuffer)) > 0){byteBuffer.flip();sb.append(new String(byteBuffer.array(),0,len));//System.out.println(new String(byteBuffer.array(),0,len));byteBuffer.clear();}//System.out.println(sb);parseHttpRequest(sb);} catch (IOException e) {e.printStackTrace();}}//解析http请求协议中的数据private void parseHttpRequest(StringBuilder sb) {//1.需要把StringBuilder先变成一个字符串String httpRequestStr = sb.toString();//2.获取每一行数据String[] split = httpRequestStr.split("\r\n");//3.获取请求行String httpRequestLine = split[0];//GET / HTTP/1.1//4.按照空格进行切割,得到请求行中的三部分String[] httpRequestInfo = httpRequestLine.split(" ");this.method = httpRequestInfo[0];this.requestURI = httpRequestInfo[1];this.version = httpRequestInfo[2];//5.操作每一个请求头for (int i = 1; i < split.length; i++) {String httpRequestHeaderInfo = split[i];//Host: 127.0.0.1:10000String[] httpRequestHeaderInfoArr = httpRequestHeaderInfo.split(": ");hm.put(httpRequestHeaderInfoArr[0],httpRequestHeaderInfoArr[1]);}}public String getMethod() {return method;}public void setMethod(String method) {this.method = method;}public String getRequestURI() {return requestURI;}public void setRequestURI(String requestURI) {this.requestURI = requestURI;}public String getVersion() {return version;}public void setVersion(String version) {this.version = version;}public HashMap<String, String> getHm() {return hm;}public void setHm(HashMap<String, String> hm) {this.hm = hm;}@Overridepublic String toString() {return "HttpRequest{" +"method='" + method + '\'' +", requestURI='" + requestURI + '\'' +", version='" + version + '\'' +", hm=" + hm +'}';} }
3.4给浏览器响应数据【理解】
-
实现步骤
- 将响应信息封装HttpResponse类中
- 定义方法,封装响应信息,给浏览器响应数据
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代码实现
public class HttpResponse {private String version; //协议版本private String status; //响应状态码private String desc; //状态码的描述信息//响应头数据private HashMap<String, String> hm = new HashMap<>();private HttpRequest httpRequest; //我们后面要根据请求的数据,来进行一些判断//给浏览器响应数据的方法public void sendStaticResource(SelectionKey selectionKey) {//1.给响应行赋值this.version = "HTTP/1.1";this.status = "200";this.desc = "ok";//2.将响应行拼接成一个单独的字符串 // HTTP/1.1 200 okString responseLine = this.version + " " + this.status + " " + this.desc + "\r\n";//3.给响应头赋值hm.put("Content-Type", "text/html;charset=UTF-8");//4.将所有的响应头拼接成一个单独的字符串StringBuilder sb = new StringBuilder();Set<Map.Entry<String, String>> entries = hm.entrySet();for (Map.Entry<String, String> entry : entries) {sb.append(entry.getKey()).append(": ").append(entry.getValue()).append("\r\n");}//5.响应空行String emptyLine = "\r\n";//6.响应行,响应头,响应空行拼接成一个大字符串String responseLineStr = responseLine + sb.toString() + emptyLine;try {//7.将上面三个写给浏览器SocketChannel socketChannel = (SocketChannel) selectionKey.channel();ByteBuffer byteBuffer1 = ByteBuffer.wrap(responseLineStr.getBytes());socketChannel.write(byteBuffer1);//8.单独操作响应体//因为在以后响应体不一定是一个字符串//有可能是一个文件,所以单独操作String s = "哎哟,妈呀,终于写完了.";ByteBuffer byteBuffer2 = ByteBuffer.wrap(s.getBytes());socketChannel.write(byteBuffer2);//9.释放资源socketChannel.close();} catch (IOException e) {e.printStackTrace();}}public String getVersion() {return version;}public void setVersion(String version) {this.version = version;}public String getStatus() {return status;}public void setStatus(String status) {this.status = status;}public String getDesc() {return desc;}public void setDesc(String desc) {this.desc = desc;}public HashMap<String, String> getHm() {return hm;}public void setHm(HashMap<String, String> hm) {this.hm = hm;}public HttpRequest getHttpRequest() {return httpRequest;}public void setHttpRequest(HttpRequest httpRequest) {this.httpRequest = httpRequest;}@Overridepublic String toString() {return "HttpResponse{" +"version='" + version + '\'' +", status='" + status + '\'' +", desc='" + desc + '\'' +", hm=" + hm +", httpRequest=" + httpRequest +'}';} }
3.5代码优化【理解】
-
实现步骤
- 根据请求资源路径不同,响应不同的数据
- 服务端健壮性处理
- 访问不存在的资源处理
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代码实现
/*** 接收连接的任务处理类*/ public class AcceptHandler {public SocketChannel connSocketChannel(SelectionKey selectionKey){try {//获取到已经就绪的服务端通道ServerSocketChannel ssc = (ServerSocketChannel) selectionKey.channel();SocketChannel socketChannel = ssc.accept();//设置为非阻塞状态socketChannel.configureBlocking(false);//把socketChannel注册到选择器上socketChannel.register(selectionKey.selector(), SelectionKey.OP_READ);return socketChannel;} catch (IOException e) {e.printStackTrace();}return null;} } /*** 接收客户端请求的类*/ public class HttpServer {public static void main(String[] args) throws IOException {//1.打开服务端通道ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();//2.让这个通道绑定一个端口serverSocketChannel.bind(new InetSocketAddress(10000));//3.设置通道为非阻塞serverSocketChannel.configureBlocking(false);//4.打开一个选择器Selector selector = Selector.open();//5.绑定选择器和服务端通道serverSocketChannel.register(selector,SelectionKey.OP_ACCEPT);while(true){//6.选择器会监视通道的状态.int count = selector.select();if(count != 0){//7.会遍历所有的服务端通道.看谁准备好了,谁准备好了,就让谁去连接.//获取所有服务端通道的令牌,并将它们都放到一个集合中,将集合返回.Set<SelectionKey> selectionKeys = selector.selectedKeys();Iterator<SelectionKey> iterator = selectionKeys.iterator();while(iterator.hasNext()){//selectionKey 依次表示每一个服务端通道的令牌SelectionKey selectionKey = iterator.next();if(selectionKey.isAcceptable()){//获取连接AcceptHandler acceptHandler = new AcceptHandler();acceptHandler.connSocketChannel(selectionKey);}else if(selectionKey.isReadable()){//读取数据HttpRequest httpRequest = new HttpRequest();httpRequest.parse(selectionKey);System.out.println("http请求的数据为 ---->" + httpRequest);if(httpRequest.getRequestURI() == null || "".equals(httpRequest.getRequestURI())){selectionKey.channel();continue;}System.out.println("...数据解析完毕,准备响应数据....");//响应数据HttpResponse httpResponse = new HttpResponse();httpResponse.setHttpRequest(httpRequest);httpResponse.sendStaticResource(selectionKey);}//任务处理完毕以后,将SelectionKey从集合中移除iterator.remove();}}}} } /*** 用来封装请求数据的类*/ public class HttpRequest {private String method; //请求方式private String requestURI; //请求的uriprivate String version; //http的协议版本private HashMap<String,String> hm = new HashMap<>();//所有的请求头//parse --- 获取请求数据 并解析public void parse(SelectionKey selectionKey){try {SocketChannel socketChannel = (SocketChannel) selectionKey.channel();StringBuilder sb = new StringBuilder();//创建一个缓冲区ByteBuffer byteBuffer = ByteBuffer.allocate(1024);int len;//循环读取while((len = socketChannel.read(byteBuffer)) > 0){byteBuffer.flip();sb.append(new String(byteBuffer.array(),0,len));//System.out.println(new String(byteBuffer.array(),0,len));byteBuffer.clear();}//System.out.println(sb);parseHttpRequest(sb);} catch (IOException e) {e.printStackTrace();}}//解析http请求协议中的数据private void parseHttpRequest(StringBuilder sb) {//1.需要把StringBuilder先变成一个字符串String httpRequestStr = sb.toString();if(!(httpRequestStr == null || "".equals(httpRequestStr))){//2.获取每一行数据String[] split = httpRequestStr.split("\r\n");//3.获取请求行String httpRequestLine = split[0];//GET / HTTP/1.1//4.按照空格进行切割,得到请求行中的三部分String[] httpRequestInfo = httpRequestLine.split(" ");this.method = httpRequestInfo[0];this.requestURI = httpRequestInfo[1];this.version = httpRequestInfo[2];//5.操作每一个请求头for (int i = 1; i < split.length; i++) {String httpRequestHeaderInfo = split[i];//Host: 127.0.0.1:10000String[] httpRequestHeaderInfoArr = httpRequestHeaderInfo.split(": ");hm.put(httpRequestHeaderInfoArr[0],httpRequestHeaderInfoArr[1]);}}}public String getMethod() {return method;}public void setMethod(String method) {this.method = method;}public String getRequestURI() {return requestURI;}public void setRequestURI(String requestURI) {this.requestURI = requestURI;}public String getVersion() {return version;}public void setVersion(String version) {this.version = version;}public HashMap<String, String> getHm() {return hm;}public void setHm(HashMap<String, String> hm) {this.hm = hm;}@Overridepublic String toString() {return "HttpRequest{" +"method='" + method + '\'' +", requestURI='" + requestURI + '\'' +", version='" + version + '\'' +", hm=" + hm +'}';} } /*** 用来封装响应数据的类*/ public class HttpResponse {private String version; //协议版本private String status; //响应状态码private String desc; //状态码的描述信息//响应头数据private HashMap<String, String> hm = new HashMap<>();private HttpRequest httpRequest; //我们后面要根据请求的数据,来进行一些判断//给浏览器响应数据的方法public void sendStaticResource(SelectionKey selectionKey) {//1.给响应行赋值this.version = "HTTP/1.1";this.status = "200";this.desc = "ok";//3.给响应头赋值//先获取浏览器请求的URIString requestURI = this.getHttpRequest().getRequestURI();if(requestURI != null){File file = new File(WEB_APP_PATH + requestURI);//判断这个路径是否存在if(!file.exists()){this.status = "404";this.desc = "NOT FOUNG";}if("200".equals(this.status)){if("/".equals(requestURI)){hm.put("Content-Type", "text/html;charset=UTF-8");}else if("/favicon.ico".equals(requestURI)){hm.put("Content-Type", "image/x-icon");}else if("/a.txt".equals(requestURI)){hm.put("Content-Type", "text/html;charset=UTF-8");}else if("/1.jpg".equals(requestURI)){hm.put("Content-Type", "image/jpeg");}else if("/1.png".equals(requestURI)){hm.put("Content-Type", "image/png");}}else{hm.put("Content-Type", "text/html;charset=UTF-8");}}//2.将响应行拼接成一个单独的字符串 // HTTP/1.1 200 okString responseLine = this.version + " " + this.status + " " + this.desc + "\r\n";//4.将所有的响应头拼接成一个单独的字符串StringBuilder sb = new StringBuilder();Set<Map.Entry<String, String>> entries = hm.entrySet();for (Map.Entry<String, String> entry : entries) {sb.append(entry.getKey()).append(": ").append(entry.getValue()).append("\r\n");}//5.响应空行String emptyLine = "\r\n";//6.响应行,响应头,响应空行拼接成一个大字符串String responseLineStr = responseLine + sb.toString() + emptyLine;try {//7.将上面三个写给浏览器SocketChannel socketChannel = (SocketChannel) selectionKey.channel();ByteBuffer byteBuffer1 = ByteBuffer.wrap(responseLineStr.getBytes());socketChannel.write(byteBuffer1);//8.单独操作响应体//因为在以后响应体不一定是一个字符串//有可能是一个文件,所以单独操作// String s = "哎哟,妈呀,终于写完了.";byte [] bytes = getContent();ByteBuffer byteBuffer2 = ByteBuffer.wrap(bytes);socketChannel.write(byteBuffer2);//9.释放资源socketChannel.close();} catch (IOException e) {e.printStackTrace();}}public static final String WEB_APP_PATH = "mynio\\webapp";private byte[] getContent() {try {//1.获取浏览器请求的URIString requestURI = this.getHttpRequest().getRequestURI();if(requestURI != null){if("200".equals(this.status)){//2.判断一下请求的URI,根据不同的URI来响应不同的东西if("/".equals(requestURI)){String s = "哎哟,妈呀,终于写完了.";return s.getBytes();}else/* if("/favicon.ico".equals(requestURI))*/{//获取一个ico文件FileInputStream fis = new FileInputStream(WEB_APP_PATH + requestURI);//把ico文件变成一个字节数组返回return IOUtils.toByteArray(fis);}}else{return "访问的资源不存在".getBytes();}}} catch (IOException e) {e.printStackTrace();}return new byte[0];}public String getVersion() {return version;}public void setVersion(String version) {this.version = version;}public String getStatus() {return status;}public void setStatus(String status) {this.status = status;}public String getDesc() {return desc;}public void setDesc(String desc) {this.desc = desc;}public HashMap<String, String> getHm() {return hm;}public void setHm(HashMap<String, String> hm) {this.hm = hm;}public HttpRequest getHttpRequest() {return httpRequest;}public void setHttpRequest(HttpRequest httpRequest) {this.httpRequest = httpRequest;}@Overridepublic String toString() {return "HttpResponse{" +"version='" + version + '\'' +", status='" + status + '\'' +", desc='" + desc + '\'' +", hm=" + hm +", httpRequest=" + httpRequest +'}';} }