Java 我的tcp客户端/服务器程序中没有写入值
在我的TCP套接字程序中,我必须将数据从客户端发送到服务器。在服务器端,我必须读取流并将其写入文件。但文件是创建的,里面什么也没写 要发送文件的客户端编码:Java 我的tcp客户端/服务器程序中没有写入值,java,sockets,tcp,io,Java,Sockets,Tcp,Io,在我的TCP套接字程序中,我必须将数据从客户端发送到服务器。在服务器端,我必须读取流并将其写入文件。但文件是创建的,里面什么也没写 要发送文件的客户端编码: try { Socket ss = new Socket("localhost", 5010); BufferedOutputStream put = new BufferedOutputStream(ss.getOutputStream()); BufferedReader st = new BufferedR
try
{
Socket ss = new Socket("localhost", 5010);
BufferedOutputStream put = new BufferedOutputStream(ss.getOutputStream());
BufferedReader st = new BufferedReader(new InputStreamReader(ss.getInputStream()));
File f = new File("e://read.txt");
FileInputStream fis = new FileInputStream(f);
byte buf[] = new byte[1024];
int read;
while((read = fis.read(buf, 0, 1024)) != -1)
{
put.write(buf,0,read);
put.flush();
}
//d.close();
System.out.println("File transfered");
ss.close();
}
catch(Exception e)
{
System.out.println(e);
}
读取输入流并将其写入文件的服务器:
try
{
ServerSocket ss = new ServerSocket(5010);
Socket s = ss.accept();
BufferedReader get = new BufferedReader(new InputStreamReader(s.getInputStream()));
FileWriter writedata = new FileWriter("c://write.txt");
BufferedWriter bw = new BufferedWriter(writedata);
String line=bw.toString();
while ((line = get.readLine()) != null) {
bw.write(line + "\n");
}
}
catch(Exception e)
{
System.out.println(e);
}
有什么问题吗?您忘记了bw.close和bw.flush…下面是有效的代码
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class TestServer
{
public static void main(String[] args)
{
try
{
ServerSocket ss=new ServerSocket(5010);
Socket s=ss.accept();
BufferedReader get= new BufferedReader(new InputStreamReader(s.getInputStream()));
FileWriter writedata=new FileWriter("c://Test//testoutput.txt");
BufferedWriter bw=new BufferedWriter(writedata);
String line=bw.toString();
while ((line = get.readLine()) != null) {
bw.write(line + "\n");
}
bw.flush();
bw.close();
}
catch(Exception e)
{
System.out.println(e);
}
}
}
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.net.Socket;
public class TestClient
{
public static void main(String[] args)
{
try
{
Socket ss=new Socket("localhost",5010);
BufferedOutputStream put=new BufferedOutputStream(ss.getOutputStream());
BufferedReader st=new BufferedReader(new InputStreamReader(ss.getInputStream()));
File f=new File("c://Test//testinput.txt");
FileInputStream fis=new FileInputStream(f);
byte buf[]=new byte[1024];
int read;
while((read=fis.read(buf,0,1024))!=-1)
{
put.write(buf,0,read);
put.flush();
}
//d.close();
System.out.println("File transfered");
ss.close();
ss.close();
}
catch(Exception e)
{
System.out.println(e);
}
}
}
除非您知道数据是文本,否则不要使用读卡器和写卡器。使用InputStreams和OutputStreams,并复制它们,以便:
while ((count = in.read(buffer)) > 0)
{
out.write(buffer, 0, count);
}
out.close();
in.close();
在客户端和服务器中都使用此逻辑
注:
flush()
放入该循环中会适得其反buffer
大于4096,则使用BufferedInputStream
是毫无意义的您忘记在
语句之后放置bw.close()
,而语句您是否尝试过以追加模式写入?bw=新的BufferedWriter(writedata,true)谢谢。它可以工作。但是源文件中只写了一个字符,而不是全部内容。我测试了我提到的程序的各种文件,它可以工作…请尝试运行精确的程序…@Ameer此代码只适用于文本文件,甚至对于那些可能更改行终止符的文件。它会损坏二进制文件。一般来说,除非您知道数据是文本,否则不应该使用读卡器和写卡器。将行
初始化为bw.toString()
完全没有意义。