stream如何让服务器以多行响应?(爪哇)
我想从文件中提取文本,然后将其发送到服务器,以便在将其发送回打印出来的客户机之前对其进行资本化。我如何做到这一点
我可以读取一行并将其发送回客户端,我已经成功地将多行写入输出流(供服务器读取),但我不知道现在该怎么做
我有一个从文件中读取文本的客户端:
import java.io.*;
import java.net.*;
import java.util.Date;
public class Client
{
public static void main(String[] args)
{
try
{
// First create the input from keyboard
BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Client Program");
// Next we need to find out the IP address and port number of the server
System.out.print("Enter IP Address of server: ");
String ip = input.readLine();
System.out.print("Enter port number of server: ");
String port_string = input.readLine();
// The port number needs to be an int, so convert the string to an int
int port = Integer.parseInt(port_string);
// Connect to the server
Socket sock = new Socket(ip, port);
// Create the incoming stream to read messages from
DataInputStream network = new DataInputStream(sock.getInputStream());
//Create the output stream to the client
DataOutputStream message = new DataOutputStream(sock.getOutputStream());
//Send message
//message.writeUTF("some text");
FileReader file = new FileReader("text.dat");
BufferedReader input_file = new BufferedReader(file);
// Loop until EOF
while (input_file.ready()){
// Read next line from the file
String line = input_file.readLine();
// Write line to server
message.writeUTF(line + "\n");
//System.out.println(line);
}
// Display our address
System.out.println("Address: " + sock.getInetAddress());
String line;
// Loop until the connection closes, reading from the network
while ((line = network.readUTF()) != null)
{
// Display the received message
System.out.println(line);
}
}
catch (IOException ioe)
{
// This is expected when the server closes the network connection
System.err.println("Error in I/O");
System.err.println(ioe.getMessage());
System.exit(-1);
}
}
}
然后是一个服务器,它应该获取这些字符串并将其大写:
import java.io.*;
import java.net.*;
import java.util.*;
public class Server
{
public static void main(String[] args)
{
try
{
// First create the input from the keyboard
BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Server Program");
// Get the port to listen on
System.out.print("Enter port number to listen on: ");
String port_string = input.readLine();
// The port number needs to be an int, so convert the String to an int
int port = Integer.parseInt(port_string);
// Create a ServerSocket to listen on this address
ServerSocket server = new ServerSocket(port);
// Accept an incoming client connection on the server socket
Socket sock = server.accept();
// Create the output stream to the client
DataOutputStream network = new DataOutputStream(sock.getOutputStream());
//Create the incoming stream to read messages from
DataInputStream message = new DataInputStream(sock.getInputStream());
String newLine = inFromClient.readLine();
//Line to read
String line;
line = message.readUTF();
line = line.toUpperCase();
// Send message
network.writeUTF(newLine);
// Close sockets. This will cause the client to exit
sock.close();
server.close();
}
catch (IOException ioe)
{
System.err.println("Error in I/O");
System.err.println(ioe.getMessage());
System.exit(-1);
}
}
}
# 1 楼答案
最简单的方法是使用Apache Commons中的IOUtils。尤蒂尔斯。readLines将返回字符串列表
完全相同的问题:Read/convert an InputStream to a String
# 2 楼答案
问题是您的服务器只读取了一次流并关闭了套接字连接。 您的服务器如何知道您已将客户端数据发送到服务器套接字? 您应该修改服务器以监听端口,直到发送完全文。为此,你可以这样做:
并在发送完所有行后从客户端发送“结束”