[网络协议]HTTP 简易服务器--返回请求的文件

package network;

import java.io.*;
import java.net.*;
import java.util.*;

public class HTTPServerV2 {
    public static void main(String[] args) {
        int port;
        ServerSocket serverSocket;

        // 设置服务器使用的端口
        try {
            port = Integer.parseInt(args[0]);
        } catch (Exception e) {
            System.out.println("port = 8080 (默认)");
            port = 8080; //默认端口为8080
        }

        try {
            serverSocket = new ServerSocket(port);
            System.out.println("服务器正在监听端口：" + serverSocket.getLocalPort());

            while (true) { //服务器在一个无限循环中不断接收来自客户的TCP连接请求
                try {
                    //等待客户的TCP连接请求
                    final Socket socket = serverSocket.accept();
                    System.out.println("建立了与客户的一个新的TCP连接，该客户的地址为：" + socket.getInetAddress() + ":" + socket.getPort());

                    service(socket);  //响应客户请求

                } catch (Exception e) {
                    System.out.println("客户端请求的资源不存在");
                }
            } //#while
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 响应客户的HTTP请求
     */
    public static void service(Socket socket) throws Exception {

        /*读取HTTP请求信息*/
        InputStream socketIn = socket.getInputStream(); //获得输入流
        Thread.sleep(500);  //睡眠500毫秒，等待 HTTP 请求

        //在进行网络操作时往往出错，因为你调用 available()方法时，对方发送的数据可能还没有到达，你得到的count是0 。
        int size = socketIn.available();
        byte[] requestBuffer = new byte[size];

        socketIn.read(requestBuffer);
        String request = new String(requestBuffer);
        System.out.println("---------------------请求内容-----------------------");
        System.out.println(request); //打印HTTP请求数据
        System.out.println("--------------------------------------------");

        /*解析HTTP请求*/
        //获得 HTTP 请求的第一行
        int endIndex = request.indexOf("\r\n");
        if (endIndex == -1)
            endIndex = request.length();
        String firstLineOfRequest = request.substring(0, endIndex);

        //解析 HTTP 请求的第一行
        String[] parts = firstLineOfRequest.split(" ");
        String uri = "";
        if (parts.length >= 2) {
            uri = parts[1]; //获得 HTTP 请求中的 uri
            System.out.println(uri);
        }

        /*决定HTTP响应正文的类型*/
        String contentType;
        if (uri.contains("html") || uri.contains("htm"))
            contentType = "text/html";
        else if (uri.indexOf("jpg") != -1 || uri.indexOf("jpeg") != -1)
            contentType = "image/jpeg";
        else if (uri.indexOf("gif") != -1)
            contentType = "image/gif";
        else if (uri.indexOf("ico") != -1)
            contentType = "image/x-icon";
        else
            contentType = "application/octet-stream";


        /*创建HTTP响应结果 */
        //HTTP响应的第一行
        String responseFirstLine = "HTTP/1.1 200 OK\r\n";
        //HTTP响应头
        String responseHeader = "Content-Type:" + contentType + "\r\n\r\n";
        //获得读取响应正文数据的输入流

        FileInputStream in = new FileInputStream("webapps/root/" + uri);
        InputStreamReader inputStreamReader = new InputStreamReader(in);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

        /*发送HTTP响应结果 */
        OutputStream socketOut = socket.getOutputStream(); //获得输出流
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(socketOut);
        BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);

        bufferedWriter.write(responseFirstLine);
        bufferedWriter.write(responseHeader);
        bufferedWriter.flush();
        String line = null;

        while (null!= (line = bufferedReader.readLine())){
            bufferedWriter.write(line);
            bufferedWriter.newLine();
            bufferedWriter.flush();
        }

        Thread.sleep(1000);  //睡眠1秒，等待客户接收HTTP响应结果
        socket.close(); //关闭TCP连接
    }
}

默认情况下，需要指定请求的文件内容，而不是默认的资源“/”。例如在浏览器中输入的网址为：http://127.0.0.1:8080/index.htm 或者?http://127.0.0.1:8080/index.html。

还可以将网站的图标存放到资源的文件夹（webapps/root）中，这样就可以在浏览器中显示当前网站的图标了。http://127.0.0.1:8080/index.htm 或者?

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