java - 如何使用java套接字编程获取网站的内容（单个文本文件）

Question

Socket sock = new Socket(HOST, 80);
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(sock.getOutputStream()));
writer.write("GET "+"......txt "+"HTTP/1.1\r\n"
            + "Host: HOST\r\n"
            + "Connection: keep-alive\r\n"
            + "\r\n");
writer.flush();
BufferedReader reader = new BufferedReader(new InputStreamReader(sock.getInputStream()));

String serverMsg = reader.readLine();
String line = "";
while((line = reader.readLine()) != null)
    System.out.println("answer: " + serverMsg);

Answer 1

URL当然，使用套接字是可行的，使用(and URLConnection) 代替更方便：

URL url = new URL("http://url.of.your.webpage");
try (InputStream is = url.openStream()) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    String line = reader.readLine();
    while (line != null) {
        System.out.println(line);
        line = reader.readLine();
    }
}

此示例仅使用URL#openStream(). 如果您需要对连接进行更多控制，请URL#openConnection()改用：

URL url = new URL("http://url.of.your.webpage");
URLConnection connection = url.openConnection();
// configure connection
connection.connect();
try (InputStream is = connection.getInputStream()) {
    // ...
}

Answer 2

只是猜测，因为您的问题非常不清楚，但请尝试更改：

while((line = reader.readLine()) != null)
    System.out.println("answer: " + serverMsg);

至

while((line = reader.readLine()) != null)
    System.out.println("answer: " + line);

在您发布的代码中，您一直分配给line，但实际上并没有打印它。