Java 简单套接字程序中的错误
我无法发送第二个实例的数据。服务器只是无限期地等待客户端数据 以下是我的示例服务器代码片段：Java 简单套接字程序中的错误,java,sockets,java-io,Java,Sockets,Java Io,我无法发送第二个实例的数据。服务器只是无限期地等待客户端数据 以下是我的示例服务器代码片段： ServerSocket serv = new ServerSocket(6789); Socket soc = serv.accept(); System.out.println("waiting for client's input"); BufferedReader in = new BufferedReader(new InputStreamReader(s
ServerSocket serv = new ServerSocket(6789);
Socket soc = serv.accept();
System.out.println("waiting for client's input");
BufferedReader in = new BufferedReader(new InputStreamReader(soc.getInputStream()));
DataOutputStream out = new DataOutputStream(soc.getOutputStream());
String indata=in.readLine();
System.out.println("The client says: "+indata+"\n Send them some data: ");
String datum="demodata";
out.writeBytes(datum);
System.out.println("Data sent");
ocket soc = new Socket("localhost",6789);
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedReader in = new BufferedReader(new InputStreamReader(soc.getInputStream()));
DataOutputStream out = new DataOutputStream(soc.getOutputStream());
System.out.println("Connected to: "+soc.getLocalAddress() +"\nEnter data to be sent: ");
String outdata = br.readLine(); //take input
out.writeBytes(outdata); // send
String indata=in.readLine(); //read
System.out.println("Data Sent! Now reading data from server "+indata)
请告诉我我的问题！提前感谢我想您忘记刷新输出流了
在服务器端和客户端的out.writeBytes之后添加一行：out.flush。我想您忘记刷新输出流了
在服务器端和客户端的out.writeBytes之后添加行：out.flush。您的客户端在写入的输出中没有发送换行符。您的服务器通过在BufferedReader上调用readLine来隐式地期待这个换行符，BufferedReader在通过该方法读取的数据中期待一个终止的换行符。在调出.writeBytes后，在客户端和服务器代码中添加以下内容：
或者，您也可以使用PrintWriter，只使用其println方法。您的客户机在写入的输出中没有发送换行符。您的服务器通过在BufferedReader上调用readLine来隐式地期待这个换行符，BufferedReader在通过该方法读取的数据中期待一个终止的换行符。在调出.writeBytes后，在客户端和服务器代码中添加以下内容：
或者，您也可以使用PrintWriter，只使用它的println方法。答案很简单。您希望在服务器和客户端之间交换文本行 正确的部分位于服务器端：
String indata=in.readLine();
out.writeBytes(outdata); // send
之后，服务器端的readLine将识别\n终止的行，并继续操作。答案非常简单。您希望在服务器和客户端之间交换文本行 正确的部分位于服务器端：
String indata=in.readLine();
out.writeBytes(outdata); // send
之后，服务器端的readLine将识别\n终止的行，并将继续操作。以下是一些示例代码。看看它是否适合你。您可以使用Ctrl-C停止服务器代码，客户端将等待服务器重新出现 此外，您可以停止服务器，它将等待客户端重新出现。 main方法具有语法
package test;
import java.io.*;
import java.net.*;
public class SocketIPC{
public PrintWriter out;
BufferedReader in;
Socket socket = null;
ServerSocket serverSocket = null;
StringBuffer sb;
int port;
public SocketIPC(int port) throws Exception{
this.port = port;
}
public void send(String msg){
sb.append(msg+"\n");
}
public void flush(){
out.write(sb.toString());
sb = new StringBuffer();
out.flush();
}
public String recv() throws Exception{
return in.readLine();
}
public void setIO() throws Exception{
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
sb = new StringBuffer();
}
public void serverLoop() throws Exception{
serverSocket = new ServerSocket(port);
while(true){
socket = serverSocket.accept();
setIO();
int count = 0;
System.out.println("Connected.");
while(true){
count += 1;
for(int j=0; j<100; j++)
send("+");
send(String.format(".%d", count));
flush();
Thread.sleep(1000L);
String msg = recv();
if (msg!=null)
System.out.println(msg);
else
break;// socket connection is broken
}
}
}
public void clientLoop() throws Exception{
while(true){
while(socket==null){
try{
socket = new Socket("localhost", port);
}catch(Exception e){
System.out.println("Waiting for server.");
Thread.sleep(1000L);
}
}
setIO();
System.out.println("Connected.");
while(true){
String msg = recv();
if (msg==null){
socket.close();
socket = null;
break;
}
if (msg.charAt(0)=='.'){
int idx = Integer.parseInt(msg.substring(1));
System.out.println(idx);
send(Integer.toString(idx));
Thread.sleep(2000);
flush();
}
}
}
}
public static void main(String[] args){
if (args.length != 1){
System.out.println("Server invocation: java test.SocketIPC s");
System.out.println("Client invocation: java test.SocketIPC c");
}
int port = 32000;
try{
SocketIPC fip = new SocketIPC(port);
if (args[0].equals("s")){
System.out.println("Server started");
fip.serverLoop();
}else{
System.out.println("Client started");
fip.clientLoop();
}
System.out.println("Done");
}catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
System.exit(1);
}
}
}
下面是一些示例代码。看看它是否适合你。您可以使用Ctrl-C停止服务器代码，客户端将等待服务器重新出现 此外，您可以停止服务器，它将等待客户端重新出现。 main方法具有语法
package test;
import java.io.*;
import java.net.*;
public class SocketIPC{
public PrintWriter out;
BufferedReader in;
Socket socket = null;
ServerSocket serverSocket = null;
StringBuffer sb;
int port;
public SocketIPC(int port) throws Exception{
this.port = port;
}
public void send(String msg){
sb.append(msg+"\n");
}
public void flush(){
out.write(sb.toString());
sb = new StringBuffer();
out.flush();
}
public String recv() throws Exception{
return in.readLine();
}
public void setIO() throws Exception{
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
sb = new StringBuffer();
}
public void serverLoop() throws Exception{
serverSocket = new ServerSocket(port);
while(true){
socket = serverSocket.accept();
setIO();
int count = 0;
System.out.println("Connected.");
while(true){
count += 1;
for(int j=0; j<100; j++)
send("+");
send(String.format(".%d", count));
flush();
Thread.sleep(1000L);
String msg = recv();
if (msg!=null)
System.out.println(msg);
else
break;// socket connection is broken
}
}
}
public void clientLoop() throws Exception{
while(true){
while(socket==null){
try{
socket = new Socket("localhost", port);
}catch(Exception e){
System.out.println("Waiting for server.");
Thread.sleep(1000L);
}
}
setIO();
System.out.println("Connected.");
while(true){
String msg = recv();
if (msg==null){
socket.close();
socket = null;
break;
}
if (msg.charAt(0)=='.'){
int idx = Integer.parseInt(msg.substring(1));
System.out.println(idx);
send(Integer.toString(idx));
Thread.sleep(2000);
flush();
}
}
}
}
public static void main(String[] args){
if (args.length != 1){
System.out.println("Server invocation: java test.SocketIPC s");
System.out.println("Client invocation: java test.SocketIPC c");
}
int port = 32000;
try{
SocketIPC fip = new SocketIPC(port);
if (args[0].equals("s")){
System.out.println("Server started");
fip.serverLoop();
}else{
System.out.println("Client started");
fip.clientLoop();
}
System.out.println("Done");
}catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
System.exit(1);
}
}
}