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分享java Socket初学者问题，求教
我从书上看来的代码，
先看代码：
jdk javac 编译：
编译 ： ok [可以cmd看]
运行 ：报错，Exception in thread "main" java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at TCPEchoClient.main(TCPEchoClient.java:20)
接着，换用MyEclipse（我用的是6.5，懒得用那么新，节省资源）：
编译并运行：报错，错误一模一样 ...
-------------------------------------------
初学，真心解决不了，求教！
先看代码：
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;
public class TCPEchoClient {
public static void main(String[] arg) throws UnknownHostException, IOException{
String[] args = {
"192.168.6.196",
"i love you ",
"8"
};
if ((args.length < 2) || (args.length > 3))
throw new IllegalArgumentException("Parameter(s): <Server> <Word> [<Port>]");
String server = args[0];
byte[] data = args[1].getBytes();
int servPort = (args.length == 3) ? Integer.parseInt(args[2]) : 7;
Socket socket = new Socket(server, servPort);
System.out.println("Connected to server...sending echo string");
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
out.write(data);
int totalBytesRcvd = 0;
int bytesRcvd;
while (totalBytesRcvd < data.length) {
if ((bytesRcvd = in.read(data, totalBytesRcvd,
data.length - totalBytesRcvd)) == -1)
throw new SocketException("Connection closed prematurely");
totalBytesRcvd += bytesRcvd;
}
System.out.println("Received: " + new String(data));
socket.close();
}
}
jdk javac 编译：
编译 ： ok [可以cmd看]
运行 ：报错，Exception in thread "main" java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at TCPEchoClient.main(TCPEchoClient.java:20)
接着，换用MyEclipse（我用的是6.5，懒得用那么新，节省资源）：
编译并运行：报错，错误一模一样 ...
-------------------------------------------
初学，真心解决不了，求教！
...全文
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weidu23 2013-11-12
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谢谢
西电小楠 2013-11-06
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我初学，不懂 ？
书上就这个代码啊，然后直接测试，书上说代码通过了，还写了结果 。
可是我自己，无论是那书上的源代码，还是自己改编的代码，都抱错，都是Connection refused:connect![/quote]书上应该是有两段代码的，只有先运行服务器上那部分代码，再运行客户端上那部分代码，才能成功的……[/quote]
这些代码在书上的18 - 20 页。
可是，书上的确只有这一段，不同的是，它上面说了这段代码后，然后直接就javac编译运行。
有两个代码，可他们真的不是相关联的，不信我吧源代码发给你：
------------ TCPEchoClient -------------
import java.net.Socket;
import java.net.SocketException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class TCPEchoClient {
public static void main(String[] args) throws IOException {
if ((args.length < 2) || (args.length > 3)) // Test for correct # of args
throw new IllegalArgumentException("Parameter(s): <Server> <Word> [<Port>]");
String server = args[0]; // Server name or IP address
// Convert argument String to bytes using the default character encoding
byte[] data = args[1].getBytes();
int servPort = (args.length == 3) ? Integer.parseInt(args[2]) : 7;
// Create socket that is connected to server on specified port
Socket socket = new Socket(server, servPort);
System.out.println("Connected to server...sending echo string");
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
out.write(data); // Send the encoded string to the server
// Receive the same string back from the server
int totalBytesRcvd = 0; // Total bytes received so far
int bytesRcvd; // Bytes received in last read
while (totalBytesRcvd < data.length) {
if ((bytesRcvd = in.read(data, totalBytesRcvd,
data.length - totalBytesRcvd)) == -1)
throw new SocketException("Connection closed prematurely");
totalBytesRcvd += bytesRcvd;
} // data array is full
System.out.println("Received: " + new String(data));
socket.close(); // Close the socket and its streams
}
}
import java.net.*; // for Socket, ServerSocket, and InetAddress
import java.io.*; // for IOException and Input/OutputStream
public class TCPEchoServer {
private static final int BUFSIZE = 32; // Size of receive buffer
public static void main(String[] args) throws IOException {
if (args.length != 1) // Test for correct # of args
throw new IllegalArgumentException("Parameter(s): <Port>");
int servPort = Integer.parseInt(args[0]);
// Create a server socket to accept client connection requests
ServerSocket servSock = new ServerSocket(servPort);
int recvMsgSize; // Size of received message
byte[] receiveBuf = new byte[BUFSIZE]; // Receive buffer
while (true) { // Run forever, accepting and servicing connections
Socket clntSock = servSock.accept(); // Get client connection
SocketAddress clientAddress = clntSock.getRemoteSocketAddress();
System.out.println("Handling client at " + clientAddress);
InputStream in = clntSock.getInputStream();
OutputStream out = clntSock.getOutputStream();
// Receive until client closes connection, indicated by -1 return
while ((recvMsgSize = in.read(receiveBuf)) != -1) {
out.write(receiveBuf, 0, recvMsgSize);
}
clntSock.close(); // Close the socket. We are done with this client!
}
/* NOT REACHED */
}
}
weidu23 2013-11-05
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先来个顶贴，以免自己的问题被沉了
weidu23 2013-11-05
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可是，根本运行不起来 ！
因为一点击运行，就报错，就是我提问的那个Connection refused:connect!
-------
无论是Eclipse还是javac-->java都这样 ...
weidu23 2013-11-04
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我初学，不懂 ？
书上就这个代码啊，然后直接测试，书上说代码通过了，还写了结果 。
可是我自己，无论是那书上的源代码，还是自己改编的代码，都抱错，都是Connection refused:connect![/quote]书上应该是有两段代码的，只有先运行服务器上那部分代码，再运行客户端上那部分代码，才能成功的……[/quote]
这些代码在书上的18 - 20 页。
可是，书上的确只有这一段，不同的是，它上面说了这段代码后，然后直接就javac编译运行。
有两个代码，可他们真的不是相关联的，不信我吧源代码发给你：
------------ TCPEchoClient -------------
import java.net.Socket;
import java.net.SocketException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class TCPEchoClient {
public static void main(String[] args) throws IOException {
if ((args.length < 2) || (args.length > 3)) // Test for correct # of args
throw new IllegalArgumentException("Parameter(s): <Server> <Word> [<Port>]");
String server = args[0]; // Server name or IP address
// Convert argument String to bytes using the default character encoding
byte[] data = args[1].getBytes();
int servPort = (args.length == 3) ? Integer.parseInt(args[2]) : 7;
// Create socket that is connected to server on specified port
Socket socket = new Socket(server, servPort);
System.out.println("Connected to server...sending echo string");
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
out.write(data); // Send the encoded string to the server
// Receive the same string back from the server
int totalBytesRcvd = 0; // Total bytes received so far
int bytesRcvd; // Bytes received in last read
while (totalBytesRcvd < data.length) {
if ((bytesRcvd = in.read(data, totalBytesRcvd,
data.length - totalBytesRcvd)) == -1)
throw new SocketException("Connection closed prematurely");
totalBytesRcvd += bytesRcvd;
} // data array is full
System.out.println("Received: " + new String(data));
socket.close(); // Close the socket and its streams
}
}
import java.net.*; // for Socket, ServerSocket, and InetAddress
import java.io.*; // for IOException and Input/OutputStream
public class TCPEchoServer {
private static final int BUFSIZE = 32; // Size of receive buffer
public static void main(String[] args) throws IOException {
if (args.length != 1) // Test for correct # of args
throw new IllegalArgumentException("Parameter(s): <Port>");
int servPort = Integer.parseInt(args[0]);
// Create a server socket to accept client connection requests
ServerSocket servSock = new ServerSocket(servPort);
int recvMsgSize; // Size of received message
byte[] receiveBuf = new byte[BUFSIZE]; // Receive buffer
while (true) { // Run forever, accepting and servicing connections
Socket clntSock = servSock.accept(); // Get client connection
SocketAddress clientAddress = clntSock.getRemoteSocketAddress();
System.out.println("Handling client at " + clientAddress);
InputStream in = clntSock.getInputStream();
OutputStream out = clntSock.getOutputStream();
// Receive until client closes connection, indicated by -1 return
while ((recvMsgSize = in.read(receiveBuf)) != -1) {
out.write(receiveBuf, 0, recvMsgSize);
}
clntSock.close(); // Close the socket. We are done with this client!
}
/* NOT REACHED */
}
}
西电小楠 2013-11-04
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我初学，不懂 ？
书上就这个代码啊，然后直接测试，书上说代码通过了，还写了结果 。
可是我自己，无论是那书上的源代码，还是自己改编的代码，都抱错，都是Connection refused:connect![/quote]建议楼主先把理论学一下，再开始写代码吧，理论是铺垫啊……
西电小楠 2013-11-04
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我初学，不懂 ？
书上就这个代码啊，然后直接测试，书上说代码通过了，还写了结果 。
可是我自己，无论是那书上的源代码，还是自己改编的代码，都抱错，都是Connection refused:connect![/quote]书上应该是有两段代码的，只有先运行服务器上那部分代码，再运行客户端上那部分代码，才能成功的……
sliwey 2013-11-04
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把客户端和服务端的代码都运行起来 这样才能连通
weidu23 2013-11-04
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我初学，不懂 ？
书上就这个代码啊，然后直接测试，书上说代码通过了，还写了结果 。
可是我自己，无论是那书上的源代码，还是自己改编的代码，都抱错，都是Connection refused:connect!
weidu23 2013-11-04
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没有报这个JVM_Bind错误 ！ 这个是端口占用错误，没报 。
问题，报的错误在我 new Socket(server,port)这里就错了！！！
求指教 ？
weidu23 2013-11-04
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没有啊 ！
我看书上，只有TCPEchoClient.java这个代码，就可以直接运行了，可是我自己写的就是不行。
这是书上源代码，你看看：
import java.net.Socket;
import java.net.SocketException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class TCPEchoClient {
public static void main(String[] args) throws IOException {
if ((args.length < 2) || (args.length > 3)) // Test for correct # of args
throw new IllegalArgumentException("Parameter(s): <Server> <Word> [<Port>]");
String server = args[0]; // Server name or IP address
// Convert argument String to bytes using the default character encoding
byte[] data = args[1].getBytes();
int servPort = (args.length == 3) ? Integer.parseInt(args[2]) : 7;
// Create socket that is connected to server on specified port
Socket socket = new Socket(server, servPort);
System.out.println("Connected to server...sending echo string");
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
out.write(data); // Send the encoded string to the server
// Receive the same string back from the server
int totalBytesRcvd = 0; // Total bytes received so far
int bytesRcvd; // Bytes received in last read
while (totalBytesRcvd < data.length) {
if ((bytesRcvd = in.read(data, totalBytesRcvd,
data.length - totalBytesRcvd)) == -1)
throw new SocketException("Connection closed prematurely");
totalBytesRcvd += bytesRcvd;
} // data array is full
System.out.println("Received: " + new String(data));
socket.close(); // Close the socket and its streams
}
}
小行星0906 2013-10-16
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再补一句，如果是端口占用了不是报那个错误，是这个：
java.net.BindException: Address already in use: JVM_Bind
at java.net.TwoStacksPlainSocketImpl.socketBind(Native Method)
at java.net.TwoStacksPlainSocketImpl.socketBind(Unknown Source)
at java.net.AbstractPlainSocketImpl.bind(Unknown Source)
at java.net.TwoStacksPlainSocketImpl.bind(Unknown Source)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
小行星0906 2013-10-16
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自己改下对应的端口号
猜测应该是80，常用WEB端口号
String[] args = { "192.168.6.196", "i love you ", "80" };ServerSocket serverSocket = new ServerSocket(5000);
鸿蒙道尊 2013-10-15
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不知道服务，连不上服务，看一下端口是否有问题，
西电小楠 2013-10-15
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嗯，目测你本机ip是192.168.6.196。
因此应该编写另外一个服务端程序，监听本机ip，然后先运行那个程序，再运行本程序。
oh_Maxy 2013-10-15
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socket都是成对出现的，而且启动顺序是先启动服务端代码（ServerSocket说：我在这儿等着你到来），然后启动客户端代码（Socket：留下来~）。
仔细看看书，应该还有个ServerSocket的实例的。
wang530279 2013-10-15
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你的服务器端代码呢？刚才说错了，不好意思
wang530279 2013-10-15
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你的客户端的代码呢?
无聊找乐 2013-10-15
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没有server当然连不上。
