1.1. 1.NIO
1.1.1. 1.1 NIO通道客户端【应用】
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
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(); } }
1.1.2. 1.2 NIO通道服务端【应用】
NIO通道
服务端通道
只负责建立建立,不负责传递数据
客户端通道
建立建立并将数据传递给服务端
缓冲区
客户端发送的数据都在缓冲区中
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
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
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null SocketChannel 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(); } } } }
1.1.3. 1.3 NIO通道练习【应用】
客户端
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
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(); } }
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
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 clear while((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(); } } } }
1.1.4. 1.4 NIO通道练习优化【应用】
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
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
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 clear while((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(); } } } }
1.1.5. 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
选择器对象
Selector
选择器对象
SelectionKey
绑定的key
SelectableChannel
能使用选择器的通道
- SocketChannel
- ServerSocketChannel
1.1.6. 1.6NIO选择器改写服务端【应用】
实现步骤
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(); } } } } }
1.2. 2.HTTP协议
1.2.1. 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
1.2.2. 2.2URL【理解】
概述
统一资源定位符,常见的如http://bbs.itheima.com/forum.php
详解
1.2.3. 2.3抓包工具的使用【应用】
使用步骤
1.2.4. 2.4请求信息【理解】
- 组成
- 请求行
- 请求头
- 请求空行
- 请求体
请求行
请求头
小结
1.2.5. 2.5响应信息【理解】
- 组成
- 响应行
- 响应头
- 响应空行
- 响应体
响应行
响应头
小结
1.3. 3.HTTP服务器
1.3.1. 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
1.3.2. 3.2环境搭建【理解】
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
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; } }
1.3.3. 3.3获取请求信息并解析【理解】
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
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uri private 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: 127.0.0.1:10000 String[] 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; } @Override public String toString() { return "HttpRequest{" + "method='" + method + '\'' + ", requestURI='" + requestURI + '\'' + ", version='" + version + '\'' + ", hm=" + hm + '}'; } }
1.3.4. 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
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 ok String 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; } @Override public String toString() { return "HttpResponse{" + "version='" + version + '\'' + ", status='" + status + '\'' + ", desc='" + desc + '\'' + ", hm=" + hm + ", httpRequest=" + httpRequest + '}'; } }
1.3.5. 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
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uri private 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: 127.0.0.1:10000 String[] 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; } @Override public 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URI String 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 ok String 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URI String 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; } @Override public String toString() { return "HttpResponse{" + "version='" + version + '\'' + ", status='" + status + '\'' + ", desc='" + desc + '\'' + ", hm=" + hm + ", httpRequest=" + httpRequest + '}'; } }