学习笔记day_5 java socket模拟B/S服务器原理

创建好项目，web目录一定要放在项目根目录，方便用相对路径查询

创建服务器获取浏览器请求

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket server=new ServerSocket(8000);
        servers(server);
        server.close();
    }

    private static void servers(ServerSocket server) throws IOException {
        Socket socket=server.accept();
        InputStream is = socket.getInputStream();
        int read=0;
        byte[] buff=new byte[1024];
        read = is.read(buff);
        System.out.println(new String(buff,0,read));
        socket.close();
    }
}

读取文件里的内容并返回给浏览器

在这里插入代码片    private static void servers(ServerSocket server) throws IOException {
        Socket socket=server.accept();
        InputStream is = socket.getInputStream();
//        int read=0;
//        byte[] buff=new byte[1024];
//        read = is.read(buff);
//        System.out.println(new String(buff,0,read));
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        String line = br.readLine(); //   GET /web/index.html HTTP/1.1
        String[] arr = line.split(" ");//  arr[0]=GET ,arr[1]=/web/index.html HTTP/1.1
        line=arr[1];  // /web/index.html HTTP/1.1
        line=line.substring(1);  //web/index.html HTTP/1.1
        System.out.println(line);
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(line));
        BufferedOutputStream bos=new BufferedOutputStream(socket.getOutputStream());
        // 写入HTTP协议响应头,固定写法
        bos.write("HTTP/1.1 200 OK\r\n".getBytes());
        bos.write("Content-Type:text/html\r\n".getBytes());
        // 必须要写入空行,否则浏览器不解析
        int read=0;
        bos.write("\r\n".getBytes());
        while( (read=bis.read())!=-1 ){
            bos.write(read);
        }

        bis.close();
        bos.close();
        br.close();
        is.close();
        socket.close();
    }

• 一次请求得不到样式链接和图片链接，浏览器得到网页内容后会根据样式链接和图片链接自动向
  浏览器发起请求，所以浏览器要加上循环。

加上循环(显示图片和样式)，加上多线程(提高效率)

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket server=new ServerSocket(8000);
        servers(server);
        server.close();
    }

    private static void servers(ServerSocket server) throws IOException {
        while(true){
            Socket socket=server.accept();
//            System.out.println(socket);
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        InputStream is = socket.getInputStream();
                        BufferedReader br = new BufferedReader(new InputStreamReader(is));
                        String line = br.readLine(); //   GET /web/index.html HTTP/1.1
                        String[] arr = line.split(" ");//  arr[0]=GET ,arr[1]=/web/index.html HTTP/1.1
                        line=arr[1];  // /web/index.html HTTP/1.1
                        line=line.substring(1);  //web/index.html HTTP/1.1
                        System.out.println(line);
                        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(line));
                        BufferedOutputStream bos=new BufferedOutputStream(socket.getOutputStream());
                        // 写入HTTP协议响应头,固定写法
                        bos.write("HTTP/1.1 200 OK\r\n".getBytes());
                        bos.write("Content-Type:text/html\r\n".getBytes());
                        // 必须要写入空行,否则浏览器不解析
                        int read=0;
                        bos.write("\r\n".getBytes());
                        while( (read=bis.read())!=-1 ){
                            bos.write(read);
                        }

                        bis.close();
                        bos.close();
                        socket.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }).start();
        }

    }