问题是我需要在客户端显示聊天记录而不转移聊天文件。服务器和客户端在同一台机器上，即我的电脑。服务器从文件中读取char并将其写入套接字。客户端需要将其作为字符串读取，以获得保存在文件中的确切聊天记录。但按照我的方法，它是单行打印单个字符 import java.io。*;
class Server
{
public static void main(String dt[])
{
ServerSocket sskt=null;Socket skt=null;
InputStreamReader isrin=null,isrout=null;
BufferedReader brin=null,brout=null;PrintWriter pw=null;
FileWriter fw=null;FileReader fr=null;
DataInputStream dis=null;DataOutputStream dos=null;
try
{
sskt=new ServerSocket(1234);
System.out.println("Waiting for Client");
skt=sskt.accept();
System.out.println("Connected to client");
isrin=new InputStreamReader(skt.getInputStream());
brin=new BufferedReader(isrin);
isrout=new InputStreamReader(System.in);
brout=new BufferedReader(isrout);
pw=new PrintWriter(skt.getOutputStream(),true);
dis=new DataInputStream(skt.getInputStream());
dos=new DataOutputStream(skt.getOutputStream());
SimpleDateFormat sdf=new SimpleDateFormat("dd_MM_yy");
Date date=new Date();
String ing=sdf.format(date);
fw=new FileWriter(ing+".txt",true);
//do{
String str;
str=brin.readLine();
int c=Integer.parseInt(str);
switch(c)
{
case 1:
{
System.out.println("New Chat Stared");
String msg="";
do
{
SimpleDateFormat sdf1=new SimpleDateFormat("hh:mm:ss");
Date d=new Date();
String in=sdf1.format(d);
msg=brin.readLine();
System.out.println("Client says " + msg);
fw.write("Client "+in+" "+msg);
msg=brout.readLine();
pw.println(msg);
fw.write("Server "+in+" "+msg);
}
while(!msg.equals("bye"));
fw.close();
break;
}
case 2:
{
String d=brin.readLine();
File file=new File(d+".txt");
if(file.exists())
{
dos.writeBoolean(true);
System.out.println("Displaying Contents of File");
fr=new FileReader(d+".txt");
int z;
while((z=fr.read())!=-1)
{
pw.println((char)z);
}
fr.close();
dos.writeBoolean(true);
//it writes the contents of the file on the socket one char by char
}
else
{
dos.writeBoolean(false);
}
break;
}
case 3:
{
System.out.println("Client Exited");
System.exit(0);
break;
}
default:
{
System.out.println("Invalid choice");
break;
}
}
//}while(true);
}
catch(Exception e)
{
System.out.println(e);
}
finally
{
try
{
pw.close();
brin.close();
isrin.close();
skt.close();
sskt.close();
}
catch(Exception ex)
{
System.out.println(ex);
}
}
}
}
class Client
{
public static void main(String dt[])
{
Socket skt=null;
InputStreamReader isrout=null,isrin=null;
BufferedReader brout=null,brin=null;
PrintWriter pw=null;
DataOutputStream dos=null;
DataInputStream dis=null;
FileReader fw=null;
try
{
skt=new Socket("127.0.0.1",1234);
System.out.println("Connected to Server");
isrout=new InputStreamReader(System.in);
brout=new BufferedReader(isrout);
pw=new PrintWriter(skt.getOutputStream(),true);
isrin=new InputStreamReader(skt.getInputStream());
brin=new BufferedReader(isrin);
dos=new DataOutputStream(skt.getOutputStream());
dis=new DataInputStream(skt.getInputStream());
//do
//{
System.out.println("1. To start a chat");
System.out.println("2. To view chat history");
System.out.println("3. Exit");
String str="";
str=brout.readLine();
pw.println(str);
int a=Integer.parseInt(str);
switch(a)
{
case 1:
{
String msg="";
do
{
msg=brout.readLine();
pw.println(msg);
msg=brin.readLine();
System.out.println("Server Says " + msg);
}
while(!msg.equals("bye"));
break;
}
case 2:
{
System.out.println("Enter date of chat history");
String date=brout.readLine();
pw.println(date);
if(dis.readBoolean())
{
System.out.println("Chat Exists");
fw=new FileReader("H:\\Java Programs\\chatser\\chat\\client\\"+date+".txt");
int ab;
while((ab=fw.read())!=-1)
{
System.out.println(brin.readLine());
}
fw.close();
} //this syntax will read from the socket char by char and print one char after another in next line. i need to get chat history as string without copying the file at client side
else
{
System.out.println("Incorrect Entity");
}
break;
}
case 3:
{
System.out.println("Thank you");
System.exit(0);
break;
}
default:
{
System.out.println("Incorrect Entity");
}
}
//}while(true);
}
catch(Exception e)
{
System.out.println(e);
}
finally
{
try
{
pw.close();
brout.close();
isrout.close();
skt.close();
}
catch(Exception ex)
{
System.out.println(ex);
}
}
}
}
答案 0 :(得分：1)
请看下面的代码：
int z;
while((z=fr.read())!=-1) {
pw.println((char)z);
}
您正在将读取的整数转换为char，该char只能容纳一个字符。这不会打印您正在寻找的整个值。如果要将该整数转换为要打印的String，请尝试以下操作：
pw.println(Integer.toString(z))