使用Java中的HTTP套接字编程从URL读取索引文件

my problem is, i can't read the text from a given URL using HTTP sockets. For example i want to read from 88.88.8.8/text.txt and print the contents on command line yet it get stuck at the reading part without any errors:

我的问题是,我无法使用HTTP套接字从给定的URL读取文本。例如,我想从88.88.8.8/text.txt中读取并在命令行上打印内容,但它在读取部分卡住而没有任何错误:

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Base64;

public class Program {

    static final int PORT_NO = 80;

    static Socket m_socket;

    static String m_server;
    static String m_index;
    static String m_authString;

    public static void main(String[] args) throws IOException {

        try {        
            setConnectionInfoFromArgs(args);         
            m_socket = new Socket(m_server, PORT_NO);

            loginToServer();

            PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(m_socket.getOutputStream()))); 
            out.print("GET /" + m_index + " HTTP/1.1"); 
            out.print("\r\n");
            out.flush();

            BufferedReader input = new BufferedReader(new InputStreamReader(m_socket.getInputStream()));
            String line;

            while((line = input.readLine()) != null) {
                System.out.println(line); //Gets stuck here
            }
        } catch (Exception e) {
            System.out.println("Unable to connect!");
            System.out.println("Be sure to enter correct URL and authentication.");
        }
        finally {
            System.exit(0);
        }
    }

    public static void setConnectionInfoFromArgs(String[] args) {
        String[] url = args[0].split("/");
        m_server = url[0];
        m_index = url[1];

        //Encode "userName:password" to Base64
        byte[] encodedBytes = Base64.getEncoder().encode(args[1].getBytes());
        m_authString = new String(encodedBytes);
    }

    private static void loginToServer() throws IOException {       
          DataOutputStream auth = new DataOutputStream(m_socket.getOutputStream());
          auth.writeBytes("Authorization: Basic " + m_authString);
    }
}

1 个解决方案

#1

Ok i did some research and turns out both my Host header was lacking as Remy Lebeau said and also the authorization part wasn't properly included in the header. The code below fixed the issue:

好吧,我做了一些研究,结果证明我的主机标题缺乏,因为Remy Lebeau说,并且授权部分未正确包含在标题中。下面的代码修复了问题:

PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(m_socket.getOutputStream())), false);
            out.print("GET /" + m_index + " HTTP/1.1\r\n"
                    + "Host: " + m_server + "\r\n"
                    + "Authorization: Basic " + m_authString + "\r\n"
                    + "Connection: close\r\n\r\n");
            out.flush();