Question

我一直试图解决这个问题，但没有成功，所以最后我在这里得到专家的帮助。

我只想在两台计算机之间创建一个简单的客户端服务器程序。

服务器将驻留在我的笔记本电脑中，该笔记本电脑通过linksys路由器连接到互联网。

客户将驻留在大学计算机中。我将文件缩减到大学计算机，然后我通过ssh运行它。

现在还有两件值得注意的事情是我已经在我的计算机中禁用了防火墙以及我在我的linksys路由器中配置了端口转发，即它会将请求转发到我的ipaddress端口。我也让我的ipadddress静态。

以下是我笔记本电脑中的服务器代码。

/* EchoServer.java
 *
 * Copyright (c) 2000 Sean Walton and Macmillan Publishers.  Use may be in
 * whole or in part in accordance to the General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
*/

/*****************************************************************************/
/*** EchoServer.java                                                       ***/
/***                                                                       ***/
/*****************************************************************************/

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

public class EchoServer
{
    public EchoServer(int portnum)
    {
        try
        {
            server = new ServerSocket(portnum);
        }
        catch (Exception err)
        {
            System.out.println(err);
        }
    }

    public void serve()
    {
        try
        {
            while (true)
            {

                Socket client = server.accept();

                BufferedReader r = new BufferedReader(new InputStreamReader(client.getInputStream()));
                PrintWriter w = new PrintWriter(client.getOutputStream(), true);
                w.println("Welcome to the Java EchoServer.  Type 'bye' to close.");
                String line;
                do
                {
                    line = r.readLine();
                    if ( line != null )
                        w.println("Got: "+ line);
                }
                while ( !line.trim().equals("bye") );
                client.close();
            }
        }
        catch (Exception err)
        {
            System.err.println(err);
        }
    }

    public static void main(String[] args)
    {
        EchoServer s = new EchoServer(3000);
        s.serve();
    }

    private ServerSocket server;
}

以下是将驻留在大学计算机中的客户端代码。

/* EchoClient.java
 *
 * Copyright (c) 2000 Sean Walton and Macmillan Publishers.  Use may be in
 * whole or in part in accordance to the General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
*/

/*****************************************************************************/
/*** EchoClient.java                                                       ***/
/***                                                                       ***/
/*****************************************************************************/

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

public class EchoClient
{
    public static void main(String[] args)
    {
        try
        {
            Socket s = new Socket("my static ip address here", 3000);
            BufferedReader r = new BufferedReader(new InputStreamReader(s.getInputStream()));
            PrintWriter w = new PrintWriter(s.getOutputStream(), true);
            BufferedReader con = new BufferedReader(new InputStreamReader(System.in));
            String line;
            do
            {
                line = r.readLine();
                if ( line != null )
                    System.out.println(line);
                line = con.readLine();
                w.println(line);
            }
            while ( !line.trim().equals("bye") );
        }
        catch (Exception err)
        {
            System.err.println(err);
        }
    }
}

当我运行它（两者）。客户端程序运行并停止，没有任何错误。它只是挂起。

非常感谢你的帮助！

Answer 1

实际上，当您的客户端代码尝试连接到服务器并向服务器发送“字符串按摩”时此时服务器读取输入流（通过bufferreader）即line = r.readLine（）; //服务器代码

这里它将在String的末尾等待\ n或\ r或\ n \ r \ n（换行，回车）。

所以你需要在向服务器发送按摩时将最后一个字符附加为\ n或\ r或\ n \ r \ n，或者反之亦然..

.
.
.
    do
                {
                    line = r.readLine();
                    line = line +"\n"; // Add this line
                    if ( line != null )
                        System.out.println(line);
                    line = con.readLine();
                    w.println(line);
                }
.
.
.

@Client code

尝试在两台计算机之间创建一个简单的echo客户端服务器程序

1 个答案: