我经常浏览SO(即Stack Overflow),并发现了许多与我尝试做的相同的例子。但是我根本找不到我的代码问题所在。也许我只需要一个新鲜的眼睛来看我的代码。 因此,为了避免被标记为重复线程,这里就是我的问题。我有一段简单的Java代码。它打开一个端口,连接到一个套接字,获取输入流和输出流,并向输出流中放入一些文本,然后尝试读取输入流中的文本。当执行readLine方法时,它不会返回到代码中。它只是继续运行,永远不会回到主方法。
import java.net.*;
import java.io.*;
import java.io.ObjectInputStream.GetField;
public class echoserver {
public static void main(String[] args) {
// TODO Auto-generated method stub
String hostName = "127.0.0.1";
// InetAddress.getLocalHost()
int portNumber = 5000;
ServerSocket ss = null;
Socket echoSocket = null;
try {
ss = new ServerSocket(portNumber);
echoSocket = new Socket(hostName, portNumber);
// echoSocket = ss.accept();
System.out.println("open");
System.out.println(echoSocket.isBound());
PrintWriter writer = new PrintWriter(echoSocket.getOutputStream());
for (int i = 0; i < 100; i++) {
writer.print("test String");
}
writer.flush();
// writer.close();
System.out.println("inputstream read");
DataInputStream is = new DataInputStream(echoSocket.getInputStream());
String fromStream = is.readLine();
System.out.println(fromStream);
System.out.println("bufferreader read");
BufferedReader reader = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
String fromReader = reader.readLine();
System.out.println(fromReader);
} catch (UnknownHostException ex1) {
// TODO Auto-generated catch block
System.out.println("EX1");
ex1.printStackTrace();
}
catch (IOException ex2) {
// TODO: handle exception
System.out.println("EX2");
ex2.printStackTrace();
}
finally {
try {
echoSocket.close();
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
编辑:下面是更新的代码... 这段代码唯一的问题在于Server.Run中的while循环永远不会结束。我寻找了其他属性(我记得有类似isTextAvailable的东西),但找不到。这段代码的想法是将其转换为聊天客户端。不用说,这是一场斗争!
编辑2:我找到了问题所在。我从编写端没有关闭套接字,因此监听器一直在监听!感谢大家的帮助!
clientsocket.close();
添加了一行代码,就可以正常工作了!
import java.net.*;
import java.io.*;
import java.io.ObjectInputStream.GetField;
import java.util.*;
public class echoserver {
static echoserver echo;
public static class Client implements Runnable {
Socket clientsocket;
String hostName = "127.0.0.1";
int portNumber = 5000;
static int onesleep = 0;
public void run(){
System.out.println("Client Run " + new Date());
try {
clientsocket = new Socket(hostName,portNumber);
PrintWriter writer = new PrintWriter(clientsocket.getOutputStream());
for (int i = 0; i < 10; i++) {
writer.println("test String " + i );
}
writer.flush();
clientsocket.close();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public class Server implements Runnable {
public void run(){
System.out.println("Server Run" + new Date());
int portNumber = 5000;
ServerSocket ss = null;
Socket serversocket = null;
InputStreamReader streamReader;
try {
ss = new ServerSocket(portNumber);
serversocket = ss.accept();
System.out.println("bufferreader read " + new Date());
streamReader = new InputStreamReader(serversocket.getInputStream());
BufferedReader reader = new BufferedReader(streamReader);
String fromReader;
System.out.println(reader.ready());
System.out.println(reader.readLine());
while ((fromReader = reader.readLine()) != null) {
System.out.println(fromReader);
}
System.out.println("After While in Server Run");
} catch (IOException ex_server) {
// TODO Auto-generated catch block
System.out.println("Server Run Error " + new Date());
ex_server.printStackTrace();
}
finally {
try {
serversocket.close();
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("open" + new Date());
System.out.println(serversocket.isBound());
}
}
public void go(){
Server server = new Server();
Thread serverThread = new Thread(server);
serverThread.start();
Client client = new Client();
Thread clientThread = new Thread(client);
clientThread.start();
}
public static void main(String[] args) {
// TODO Auto-generated method stub
echo = new echoserver();
echo.go();
}
}
ss
用于什么? - adv12echoSocket
服务器应该可以通过 telnet 进行测试。 - Elliott Frisch