如何使这些客户端在发送端口号（java多线程套接字）后不阻塞输出
以下是所需结果的屏幕截图：（服务器在顶部，一个客户端在左下角，一个客户端在右下角） * 以下是程序当前结果的屏幕截图： （服务器在顶部，一个客户端在左下角，一个客户端在右下角）： 在上面的屏幕截图中，在左下角和右下角窗口中，命令行参数如何使这些客户端在发送端口号（java多线程套接字）后不阻塞输出,java,multithreading,sockets,Java,Multithreading,Sockets,以下是所需结果的屏幕截图：（服务器在顶部，一个客户端在左下角，一个客户端在右下角） * 以下是程序当前结果的屏幕截图： （服务器在顶部，一个客户端在左下角，一个客户端在右下角）： 在上面的屏幕截图中，在左下角和右下角窗口中，命令行参数javachatclient-l4021-p3000有两个数字（4021和3000）。数字4021是顶部窗口（服务器）的内容需要进行文件传输，因此必须以某种方式将其发送到服务器，但不幸的是，发送此号码可能会导致某些内容被阻止，这意味着您的名字是什么？的正确输出从未显
javachatclient-l4021-p3000402130004021您的名字是什么？System.out.println(“chatClient.java中的这一行在调用inputLine.readLine（）之前”）；您叫什么？输入您的消息ChatClient.javaimport java.io.*;
import java.net.*;
public class ChatClient implements Runnable
{
public static int once = 0;
private static Socket clientSocket = null;
private static Socket fileSocket = null;
private static PrintStream os = null;
private static DataInputStream is = null;
private static BufferedReader inputLine = null;
private static boolean closed = false;
public static String[] namesList = new String[10];
public int iteration = 0;
public static String[] responses = new String[50];
public int responseCount = 0;
public int filePort = 0;
public static void main(String[] args)
{
int filePort = Integer.valueOf(args[1]);
for(int i = 0; i < namesList.length; i++)
{
namesList[i] = "";
}
for(int j = 0; j < responses.length; j++)
{
responses[j] = "";
}
int portNumber = Integer.valueOf(args[3]);
String host = "localhost";
try
{
clientSocket = new Socket(host, portNumber);
os = new PrintStream(clientSocket.getOutputStream());
is = new DataInputStream(clientSocket.getInputStream());
inputLine = new BufferedReader(new InputStreamReader(System.in));
}
catch (UnknownHostException e)
{
System.err.println("Don't know about host " + host);
} catch (IOException e)
{
System.err.println("Couldn't get I/O for the connection to the host "
+ host);
}
if (clientSocket != null && os != null && is != null)
{
try
{
while (!closed)
{
if(once==0)
{
System.out.println("this line in chatClient.java is before outputstream is created");
OutputStream os2 = clientSocket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os2);
BufferedWriter bw = new BufferedWriter(osw);
bw.write("The file port is: `"+ filePort);
System.out.println("The file port is: `" + filePort);
once=3;
os.println("The file port is: `" + filePort);
os.println(inputLine.readLine() );
}
once=3;
}
new Thread(new ChatClient()).start();
os.close();
is.close();
clientSocket.close();
} catch (IOException e)
{
System.err.println("IOException: " + e);
}
}
}
@SuppressWarnings("deprecation")
public void run()
{
String responseLine = "";
try
{
while ((responseLine = is.readLine()) != null)
{
if(responseLine.equals("x") || responseLine.equals("X"))
{
System.exit(0);
}
if(responseLine.equals("Who owns the file?") && !responseLine.isEmpty() && responseLine != null)
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = "234782375920192831";
}
if(responseLine.equals("Which file do you want?"))
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
if(responseLine.equals("What is your name?"))
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
if(responseLine.equals("m") || responseLine.equals("M"))
{
responseCount++;
System.out.println("Enter your message: ");
responses[responseCount] = responseLine;
}
if(responseLine.equals("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n"))
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
if(responseLine != null && !responseLine.isEmpty() && !responseLine.equals("What is your name?") && !responseLine.equals("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n") && !responseLine.equals("Who owns the file?") && !responseLine.equals("Which file do you want?"))
{
responseCount++;
if(responses[responseCount-1].equals("234782375920192831"))
{
namesList[iteration] = responseLine;
iteration++;
}
else
{
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
}
}
closed = true;
}
catch (IOException e)
{
System.err.println("IOException: " + e);
}
}
}
import java.io.*;
import java.net.*;
import java.util.*;
public class ChatServer
{
public static List<String> listName = Collections.synchronizedList(new ArrayList<String>());
List<String> l = Collections.synchronizedList(new ArrayList<String>());
public static ServerSocket serverSocket = null;
public static ServerSocket fileSocket = null;
public static Socket clientSocket = null;
public static final int maxClientsCount = 10;
public static final ClientThreads[] threads = new ClientThreads[maxClientsCount];
public static String[] namesList = new String[10];
// public ChatClient arrayOfNames = new ChatClient;
public static int filePort = 0;
public static void main(String args[])
{
synchronized (listName)
{
//Iterator i = listName.iterator(); // Must be in synchronized block
Iterator<String> i = listName.listIterator();
}
if(args.length <3)
{
int portNumber = Integer.valueOf(args[1]).intValue();
System.out.println("waiting for connections on port " + portNumber + " ...\n ");
}
try
{
int portNumber1 = Integer.valueOf(args[1]).intValue();
serverSocket = new ServerSocket(portNumber1);
}
catch (IOException e)
{
System.out.println(e);
}
while (true)
{
try
{
clientSocket = serverSocket.accept();
int i = 0;
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String something;
System.out.println("this line is executed in chatserver.java before in.readLine()");
something = in.readLine();
String string = something;
String[] parts = string.split("`");
String part1 = parts[0];
String part2 = parts[1];
System.out.println("The file port is: " + part2);
filePort = strToInt(part2);
for (i = 0; i < maxClientsCount; i++)
{
if (threads[i] == null)
{
String name = "";
(threads[i] = new ClientThreads(clientSocket, threads, name, namesList, listName, filePort)).start();
break;
}
}
if (i == maxClientsCount)
{
PrintStream os = new PrintStream(clientSocket.getOutputStream());
os.println("Server too busy. Try later.");
os.close();
clientSocket.close();
}
}
catch (IOException e)
{
System.out.println(e);
}
}
}
public static int strToInt( String str )
{
int i = 0;
int num = 0;
boolean isNeg = false;
//Check for negative sign; if it's there, set the isNeg flag
if (str.charAt(0) == '-') {
isNeg = true;
i = 1;
}
//Process each character of the string;
while( i < str.length()) {
num *= 10;
num += str.charAt(i++) - '0'; //Minus the ASCII code of '0' to get the value of the charAt(i++).
}
if (isNeg)
num = -num;
return num;
}
}
import java.io.*;
import java.net.*;
import java.util.*;
class ClientThreads extends Thread
{
public int once = 0;
public String name1 = "";
private String clientName = null;
private DataInputStream is = null;
private PrintStream os = null;
private Socket clientSocket = null;
private final ClientThreads[] threads;
private int maxClientsCount;
public int position = 0;
public int filePort = 0;
public static List<String> listName = Collections.synchronizedList(new ArrayList<String>());
List<String> l = Collections.synchronizedList(new ArrayList<String>());
public String[] namesList = new String[10];
public ClientThreads(Socket clientSocket, ClientThreads[] threads,
String name, String[] namesList, List<String> listName, int filePort)
{
this.clientSocket = clientSocket;
this.threads = threads;
maxClientsCount = threads.length;
this.name1 = name;
this.namesList = namesList;
this.filePort = filePort;
}
@SuppressWarnings("deprecation")
public void run()
{
int maxClientsCount = this.maxClientsCount;
ClientThreads[] threads = this.threads;
synchronized (listName)
{
//Iterator i = listName.iterator(); // Must be in synchronized block
ListIterator<String> i = listName.listIterator();
}
try
{
if(once==0)
{
OutputStream os2 = clientSocket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os2);
BufferedWriter bw = new BufferedWriter(osw);
once=3;
}
once=3;
System.out.println("This line is executed before inputstream and output stream are created");
is = new DataInputStream(clientSocket.getInputStream());
os = new PrintStream(clientSocket.getOutputStream());
String name;
while (true)
{
os.println("What is your name?");
name = is.readLine().trim();
break;
}
if(listName != null)
{
synchronized(listName)
{
if(!listName.contains(name))
{
listName.add(name);
os.println("The name " + name + " has been added to the list. "
+ "The list now contains " + listName);
}
}
}
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null && threads[i] == this)
{
clientName = "@" + name;
break;
}
}
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null)
{
threads[i].os.println(name + " has connected.");
os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
}
}
while (true)
{
synchronized(listName)
{
if(!listName.contains(name))
{
listName.add(name);
os.println("The name " + name + " has been added to the list. "
+ "The list now contains " + listName);
}
}
String line = is.readLine();
if (line.startsWith("/quit"))
{
break;
}
else
{
//os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
if(line.equals("x") || line.equals("X"))
{
os.println("x");
System.exit(0);
}
if(line.equals("m") || line.equals("M"))
{
os.println("Enter your message: ");
}
if(line.equals("f") || line.equals("F"))
{
os.println("Who owns the file?");
boolean keep = true;
while (keep == true)
{
String fileOwner = is.readLine();
if(fileOwner !=null && !fileOwner.isEmpty())
{
os.println(fileOwner);
System.out.println(fileOwner);
System.out.println();
//namesList[position] = fileOwner;
// os.println("The client connected name: " + fileOwner +
// " has been added to position " + position +
// " in the namesList array " + namesList[position]);
//position++;
keep = false;
os.println("Which file do you want?");
boolean keep2 = true;
while(keep2==true)
{
String filename = is.readLine();
if(filename !=null && !filename.isEmpty())
{
// os.println(filename);
keep2 = false;
os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
}
}
}
}
if (line.startsWith("@"))
{
String[] words = line.split("\\s", 2);
if (words.length > 1 && words[1] != null)
{
words[1] = words[1].trim();
if (!words[1].isEmpty())
{
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null && threads[i] != this && threads[i].clientName != null && threads[i].clientName.equals(words[0]))
{
threads[i].os.println(name + ": " + words[1]);
this.os.println(name + ": " + words[1]);
this.os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
break;
}
}
}
}
}
}
else
{
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (!line.equals("x") && !line.equals("X") && !line.equals("f") && !line.equals("F") && !line.equals("m") && !line.equals("M") && threads[i] != null && threads[i].clientName != null && !threads[i].clientName.equals("m") && !threads[i].clientName.equals("M"))
{
threads[i].os.println(name + ": " + line + "\n");
this.os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
}
}
}
}
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null && threads[i] != this && threads[i].clientName != null)
{
threads[i].os.println(name + "has disconnected.");
}
}
}
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] == this)
{
threads[i] = null;
}
}
}
is.close();
os.close();
clientSocket.close();
} catch (IOException e)
{
}
}
}
ClientThreads.javaimport java.io.*;
import java.net.*;
public class ChatClient implements Runnable
{
public static int once = 0;
private static Socket clientSocket = null;
private static Socket fileSocket = null;
private static PrintStream os = null;
private static DataInputStream is = null;
private static BufferedReader inputLine = null;
private static boolean closed = false;
public static String[] namesList = new String[10];
public int iteration = 0;
public static String[] responses = new String[50];
public int responseCount = 0;
public int filePort = 0;
public static void main(String[] args)
{
int filePort = Integer.valueOf(args[1]);
for(int i = 0; i < namesList.length; i++)
{
namesList[i] = "";
}
for(int j = 0; j < responses.length; j++)
{
responses[j] = "";
}
int portNumber = Integer.valueOf(args[3]);
String host = "localhost";
try
{
clientSocket = new Socket(host, portNumber);
os = new PrintStream(clientSocket.getOutputStream());
is = new DataInputStream(clientSocket.getInputStream());
inputLine = new BufferedReader(new InputStreamReader(System.in));
}
catch (UnknownHostException e)
{
System.err.println("Don't know about host " + host);
} catch (IOException e)
{
System.err.println("Couldn't get I/O for the connection to the host "
+ host);
}
if (clientSocket != null && os != null && is != null)
{
try
{
while (!closed)
{
if(once==0)
{
System.out.println("this line in chatClient.java is before outputstream is created");
OutputStream os2 = clientSocket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os2);
BufferedWriter bw = new BufferedWriter(osw);
bw.write("The file port is: `"+ filePort);
System.out.println("The file port is: `" + filePort);
once=3;
os.println("The file port is: `" + filePort);
os.println(inputLine.readLine() );
}
once=3;
}
new Thread(new ChatClient()).start();
os.close();
is.close();
clientSocket.close();
} catch (IOException e)
{
System.err.println("IOException: " + e);
}
}
}
@SuppressWarnings("deprecation")
public void run()
{
String responseLine = "";
try
{
while ((responseLine = is.readLine()) != null)
{
if(responseLine.equals("x") || responseLine.equals("X"))
{
System.exit(0);
}
if(responseLine.equals("Who owns the file?") && !responseLine.isEmpty() && responseLine != null)
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = "234782375920192831";
}
if(responseLine.equals("Which file do you want?"))
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
if(responseLine.equals("What is your name?"))
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
if(responseLine.equals("m") || responseLine.equals("M"))
{
responseCount++;
System.out.println("Enter your message: ");
responses[responseCount] = responseLine;
}
if(responseLine.equals("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n"))
{
responseCount++;
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
if(responseLine != null && !responseLine.isEmpty() && !responseLine.equals("What is your name?") && !responseLine.equals("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n") && !responseLine.equals("Who owns the file?") && !responseLine.equals("Which file do you want?"))
{
responseCount++;
if(responses[responseCount-1].equals("234782375920192831"))
{
namesList[iteration] = responseLine;
iteration++;
}
else
{
System.out.println(responseLine);
responses[responseCount] = responseLine;
}
}
}
closed = true;
}
catch (IOException e)
{
System.err.println("IOException: " + e);
}
}
}
import java.io.*;
import java.net.*;
import java.util.*;
public class ChatServer
{
public static List<String> listName = Collections.synchronizedList(new ArrayList<String>());
List<String> l = Collections.synchronizedList(new ArrayList<String>());
public static ServerSocket serverSocket = null;
public static ServerSocket fileSocket = null;
public static Socket clientSocket = null;
public static final int maxClientsCount = 10;
public static final ClientThreads[] threads = new ClientThreads[maxClientsCount];
public static String[] namesList = new String[10];
// public ChatClient arrayOfNames = new ChatClient;
public static int filePort = 0;
public static void main(String args[])
{
synchronized (listName)
{
//Iterator i = listName.iterator(); // Must be in synchronized block
Iterator<String> i = listName.listIterator();
}
if(args.length <3)
{
int portNumber = Integer.valueOf(args[1]).intValue();
System.out.println("waiting for connections on port " + portNumber + " ...\n ");
}
try
{
int portNumber1 = Integer.valueOf(args[1]).intValue();
serverSocket = new ServerSocket(portNumber1);
}
catch (IOException e)
{
System.out.println(e);
}
while (true)
{
try
{
clientSocket = serverSocket.accept();
int i = 0;
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String something;
System.out.println("this line is executed in chatserver.java before in.readLine()");
something = in.readLine();
String string = something;
String[] parts = string.split("`");
String part1 = parts[0];
String part2 = parts[1];
System.out.println("The file port is: " + part2);
filePort = strToInt(part2);
for (i = 0; i < maxClientsCount; i++)
{
if (threads[i] == null)
{
String name = "";
(threads[i] = new ClientThreads(clientSocket, threads, name, namesList, listName, filePort)).start();
break;
}
}
if (i == maxClientsCount)
{
PrintStream os = new PrintStream(clientSocket.getOutputStream());
os.println("Server too busy. Try later.");
os.close();
clientSocket.close();
}
}
catch (IOException e)
{
System.out.println(e);
}
}
}
public static int strToInt( String str )
{
int i = 0;
int num = 0;
boolean isNeg = false;
//Check for negative sign; if it's there, set the isNeg flag
if (str.charAt(0) == '-') {
isNeg = true;
i = 1;
}
//Process each character of the string;
while( i < str.length()) {
num *= 10;
num += str.charAt(i++) - '0'; //Minus the ASCII code of '0' to get the value of the charAt(i++).
}
if (isNeg)
num = -num;
return num;
}
}
import java.io.*;
import java.net.*;
import java.util.*;
class ClientThreads extends Thread
{
public int once = 0;
public String name1 = "";
private String clientName = null;
private DataInputStream is = null;
private PrintStream os = null;
private Socket clientSocket = null;
private final ClientThreads[] threads;
private int maxClientsCount;
public int position = 0;
public int filePort = 0;
public static List<String> listName = Collections.synchronizedList(new ArrayList<String>());
List<String> l = Collections.synchronizedList(new ArrayList<String>());
public String[] namesList = new String[10];
public ClientThreads(Socket clientSocket, ClientThreads[] threads,
String name, String[] namesList, List<String> listName, int filePort)
{
this.clientSocket = clientSocket;
this.threads = threads;
maxClientsCount = threads.length;
this.name1 = name;
this.namesList = namesList;
this.filePort = filePort;
}
@SuppressWarnings("deprecation")
public void run()
{
int maxClientsCount = this.maxClientsCount;
ClientThreads[] threads = this.threads;
synchronized (listName)
{
//Iterator i = listName.iterator(); // Must be in synchronized block
ListIterator<String> i = listName.listIterator();
}
try
{
if(once==0)
{
OutputStream os2 = clientSocket.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os2);
BufferedWriter bw = new BufferedWriter(osw);
once=3;
}
once=3;
System.out.println("This line is executed before inputstream and output stream are created");
is = new DataInputStream(clientSocket.getInputStream());
os = new PrintStream(clientSocket.getOutputStream());
String name;
while (true)
{
os.println("What is your name?");
name = is.readLine().trim();
break;
}
if(listName != null)
{
synchronized(listName)
{
if(!listName.contains(name))
{
listName.add(name);
os.println("The name " + name + " has been added to the list. "
+ "The list now contains " + listName);
}
}
}
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null && threads[i] == this)
{
clientName = "@" + name;
break;
}
}
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null)
{
threads[i].os.println(name + " has connected.");
os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
}
}
while (true)
{
synchronized(listName)
{
if(!listName.contains(name))
{
listName.add(name);
os.println("The name " + name + " has been added to the list. "
+ "The list now contains " + listName);
}
}
String line = is.readLine();
if (line.startsWith("/quit"))
{
break;
}
else
{
//os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
if(line.equals("x") || line.equals("X"))
{
os.println("x");
System.exit(0);
}
if(line.equals("m") || line.equals("M"))
{
os.println("Enter your message: ");
}
if(line.equals("f") || line.equals("F"))
{
os.println("Who owns the file?");
boolean keep = true;
while (keep == true)
{
String fileOwner = is.readLine();
if(fileOwner !=null && !fileOwner.isEmpty())
{
os.println(fileOwner);
System.out.println(fileOwner);
System.out.println();
//namesList[position] = fileOwner;
// os.println("The client connected name: " + fileOwner +
// " has been added to position " + position +
// " in the namesList array " + namesList[position]);
//position++;
keep = false;
os.println("Which file do you want?");
boolean keep2 = true;
while(keep2==true)
{
String filename = is.readLine();
if(filename !=null && !filename.isEmpty())
{
// os.println(filename);
keep2 = false;
os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
}
}
}
}
if (line.startsWith("@"))
{
String[] words = line.split("\\s", 2);
if (words.length > 1 && words[1] != null)
{
words[1] = words[1].trim();
if (!words[1].isEmpty())
{
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null && threads[i] != this && threads[i].clientName != null && threads[i].clientName.equals(words[0]))
{
threads[i].os.println(name + ": " + words[1]);
this.os.println(name + ": " + words[1]);
this.os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
break;
}
}
}
}
}
}
else
{
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (!line.equals("x") && !line.equals("X") && !line.equals("f") && !line.equals("F") && !line.equals("m") && !line.equals("M") && threads[i] != null && threads[i].clientName != null && !threads[i].clientName.equals("m") && !threads[i].clientName.equals("M"))
{
threads[i].os.println(name + ": " + line + "\n");
this.os.println("Enter an option: 'm' = message, 'f' = file request, 'x' = exit\n");
}
}
}
}
}
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] != null && threads[i] != this && threads[i].clientName != null)
{
threads[i].os.println(name + "has disconnected.");
}
}
}
synchronized (this)
{
for (int i = 0; i < maxClientsCount; i++)
{
if (threads[i] == this)
{
threads[i] = null;
}
}
}
is.close();
os.close();
clientSocket.close();
} catch (IOException e)
{
}
}
}
import java.io.*；
导入java.net。*；
导入java.util.*；
类ClientThreads扩展线程
{
公共int一次=0；
公共字符串名称1=“”；
私有字符串clientName=null；
私有DataInputStream为空；
私有PrintStream os=null；
私有套接字clientSocket=null；
私有最终客户端线程[]个线程；
私有int MaxClientScont；
公共int位置=0；
公共int filePort=0；
public static List listName=Collections.synchronizedList（新的ArrayList（））；
List l=Collections.synchronizedList（新的ArrayList（））；
公共字符串[]名称列表=新字符串[10]；
公共ClientThreads（套接字clientSocket，ClientThreads[]线程，
字符串名称，字符串[]名称列表，列表名称，int文件端口）
{
this.clientSocket=clientSocket；
this.threads=线程；
MaxClientScont=threads.length；
this.name1=名称；
this.namesList=namesList；
this.filePort=filePort；
}
@抑制警告（“弃用”）
公开募捐
{
int MaxClientScont=this.MaxClientScont；
ClientThreads[]threads=this.threads；
已同步（列表名）
{
//迭代器i=listName.Iterator（）；//必须在同步块中
ListIterator i=listName.ListIterator（）；
}
尝试
{
如果（一次==0）
{
OutputStream os2=clientSocket.getOutputStream（）；
OutputStreamWriter osw=新的OutputStreamWriter（os2）；
BufferedWriter bw=新的BufferedWriter（osw）；
一次=3；
}
一次=3；
System.out.println（“在创建inputstream和output stream之前执行此行”）；
is=新的DataInputStream（clientSocket.getInputStream（））；
os=新的打印流（clientSocket.getOutputStream（））；
字符串名；
while（true）
{
println（“你叫什么名字？”）；
name=is.readLine（）.trim（）；
打破
}
if（listName！=null）
{
已同步（列表名）
{
如果（！listName.contains（name））
{
listName.add（name）；
println（“名称“+name+”已添加到列表中。”
+“列表现在包含”+列表名）；
}
}
}
已同步（此）
{
对于（int i=0；i