java - 使用网络类获取 url 地址

Question

我写了一个简单的代码，它是一个微型网络服务器。我想在客户端输入 loalhost:8181/pic 时显示图片但是当我 String str = in.readLine() str show only localhost:8181 我怎么能找到在客户端的浏览器中输入 localhost:8181/pic ？这是我的简单代码:

    protected void start() {
    ServerSocket s;

    System.out.println("Webserver starting up on port 80");
    System.out.println("(press ctrl-c to exit)");
    try {
        // create the main server socket
        s = new ServerSocket(8181);
    } catch (Exception e) {
        System.out.println("Error: " + e);
        return;
    }

    System.out.println("Waiting for connection");
    for (;;) {
        try {
            Socket remote = s.accept();
            System.out.println("Connection, sending data.");
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    remote.getInputStream()));
            PrintWriter out = new PrintWriter(remote.getOutputStream());
            String method = in.readLine();
            out.flush();
            remote.close();
        } catch (Exception e) {
            System.out.println("Error: " + e);
        }
    }
}

Answer 1

你需要更多这样的东西:

protected void start() {
    ServerSocket s;

    System.out.println("Webserver starting up on port 8181");
    System.out.println("(press ctrl-c to exit)");
    try {
        // create the main server socket
        s = new ServerSocket(8181);
    } catch (Exception e) {
        System.out.println("Error: " + e);
        return;
    }

    for (;;) {
        System.out.println("Waiting for connection");
        try {
            Socket remote = s.accept();
            System.out.println("Connection established.");
            BufferedReader in = new BufferedReader(new InputStreamReader(remote.getInputStream()));
            PrintWriter out = new PrintWriter(remote.getOutputStream());

            String tokens[] = in.readLine().split("\\s+") ;
            if (tokens.length != 3)
            {
                out.println("HTTP/1.0 400 Bad Request");
                out.println("Connection: close");
                out.println("");
                out.flush();
                remote.close();
                continue;
            }

            if ((tokens[2].compareToIgnoreCase("HTTP/1.0") != 0) &&
                (tokens[2].compareToIgnoreCase("HTTP/1.1") != 0))
            {
                out.println("HTTP/1.0 505 HTTP Version Not Supported");
                out.println("Connection: close");
                out.println("");
                out.flush();
                remote.close();
                continue;
            }

            if (tokens[0].compareToIgnoreCase("GET") != 0)
            {
                out.println("HTTP/1.0 405 Method Not Allowed");
                out.println("Connection: close");
                out.println("");
                out.flush();
                remote.close();
                continue;
            }

            String path = tokens[1];
            String query = null;

            int idx = path.indexOf('?');
            if (idx != -1)
            {
                query = path.substring(idx+1);
                file = path.substring(0, idx);
            }

            if (path != "/pic")
            {
                out.println("HTTP/1.0 404 Not Found");
                out.println("Connection: close");
                out.println("");
                out.flush();
                remote.close();
                continue;
            }

            out.println("HTTP/1.0 200 OK");
            out.println("Connection: close");
            out.println("Content-Type: ..."); // for you to fill in
            out.println("Content-Length: ..."); // for you to fill in
            out.println();

            // write out image data here...

            out.flush();
            remote.close();
        } catch (Exception e) {
            System.out.println("Error: " + e);
        }
    }
}