将字符串从服务器发送到客户端 - 将其保存为文本文件

Question

我知道如何将文件从服务器发送到客户端，但如何将文本字符串发送到客户端，客户端将字符串保存为文件？我应该使用 PrintWriter 来解决这个问题吗？

这是从服务器向客户端发送文件的代码： Sending files through sockets

我想做的是（而不是发送文件），从服务器发送一个String让客户端接收并保存为文件。

public class SocketFileExample {
    static void server() throws IOException {
        ServerSocket ss = new ServerSocket(3434);
        Socket socket = ss.accept();
        InputStream in = new FileInputStream("send.jpg");
        OutputStream out = socket.getOutputStream();
        copy(in, out);
        out.close();
        in.close();
    }

    static void client() throws IOException {
        Socket socket = new Socket("localhost", 3434);
        InputStream in = socket.getInputStream();
        OutputStream out = new FileOutputStream("recv.jpg");
        copy(in, out);
        out.close();
        in.close();
    }

    static void copy(InputStream in, OutputStream out) throws IOException {
        byte[] buf = new byte[8192];
        int len = 0;
        while ((len = in.read(buf)) != -1) {
            out.write(buf, 0, len);
        }
    }

    public static void main(String[] args) throws IOException {
        new Thread() {
            public void run() {
                try {
                    server();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();

        client();
    }
}

Answer 1

在这种情况下，在服务器端使用 ObjectOutputStream 写入字符串并在客户端使用 ObjectInputStream 读取来自服务器的字符串..

因此您的 server() 方法将如下所示..

static void server() throws IOException {
    ServerSocket ss = new ServerSocket(3434);
    Socket socket = ss.accept();
    OutputStream out = socket.getOutputStream();
    ObjectOutputStream oout = new ObjectOutputStream(out);
    oout.writeObject("your string here");
    oout.close();
}

和 client() 方法将如下所示..

static void client() throws IOException, ClassNotFoundException {
    Socket socket = new Socket("localhost", 3434);
    InputStream in = socket.getInputStream();
    ObjectInputStream oin = new ObjectInputStream(in);
    String stringFromServer = (String) oin.readObject();
    FileWriter writer = new FileWriter("received.txt");
    writer.write(stringFromServer);
    in.close();
    writer.close();
}

也在main方法中抛出ClassNotFoundException。

public static void main(String[] args) throws IOException, ClassNotFoundException {.......}

完成...

将字符串从服务器发送到客户端 - 将其保存为文本文件

Send String from server to client - save it as textfile

java

sockets

fileoutputstream

printwriter