问题描述

java socket 通信 服务端接收的文件大于客户端发出的文件 是什么鬼

//服务端
package Socket;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;

public class Server2User extends Thread{
private Socket socket;
private InputStream is;
private BufferedInputStream bis;
private FileOutputStream fos;
private File file;
private byte name[] = new byte[1024];
private byte transport[] = new byte[1024];
private File path;

public Server2User(Socket socket){    this.socket= socket;}public void run(){    try {        is = socket.getInputStream();        bis= new BufferedInputStream(is);        bis.read(name);        String filename = new String(name);        filename = filename.trim();        System.out.println(""得到文件名""+filename);         path = this.createFile(filename);         System.out.println(path.getName());        int length;        fos = new FileOutputStream(path);        int i = 0;        while((length=bis.read(transport))!=-1)        {                this.write2file(transport);                i++;        }        this.close();    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}private void write2file(byte[] transport){    try {         fos.write(transport);    } catch (FileNotFoundException e) {        // TODO Auto-generated catch block        e.printStackTrace();    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}private File createFile(String filename){    try {        file = new File(""f:/test/""+filename);        file.createNewFile();    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }    return file;}private void close(){        try {            if(is!=null)                is.close();            if(bis!=null)                bis.close();            if(fos!=null)                fos.close();            if(is!=null)                is.close();            if(socket!=null)                socket.close();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }}

}
//客户端
package Socket;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.net.Socket;
import java.net.UnknownHostException;

public class ClientSocket_upload {
private Socket socket;
private OutputStream os;
private BufferedOutputStream bos;
private String path;
private FileInputStream fis;
private File file;
public ClientSocket_upload(String path)
{
this.path = path;
}
public void uploadfile(){
try {
//1.创建客户端Socket，指定服务器地址和端口
socket= new Socket(""10.104.77.108"" 1080);
//2.获取输出流，向服务器端发送信息
os = socket.getOutputStream();//字节输出流
bos = new BufferedOutputStream(os);
file = new File(path);
fis= new FileInputStream(file);
String name = file.getName();
byte[] temp = name.getBytes();
byte[] bname = new byte[1024];
byte[] by = new byte[1024];
for(int i = 0 ;i<=bname.length-1;i++)
{
if(i<=temp.length-1)
{
bname[i] = temp[i];
}
else
{
bname[i]=0;
}
}
bos.write(bname);

        while((fis.read(by))!=-1)        {            bos.write(by);        }        fis.close();        bos.close();        os.close();        socket.close();    } catch (UnknownHostException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }}

}

解决方案

你的代码没有问题，我测试了你的代码，传输的文件是几k的小文件没有问题，又传输一个300MB的大文件时也没有问题。
我的测试代码是：自定义一个Server类.
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
public static void main(String[] args) {
try {
ServerSocket server = new ServerSocket(1080);
while(true){
Socket socket = server.accept();
new Server2User(socket).start();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
客户端的main方法是:

    public static void main(String[] args) {        ClientSocket_upload u = new ClientSocket_upload(""D:/WoodWang/JavaSoft/eclipse-jee-mars-R-win32-x86_64.zip"");        u.uploadfile();    }

不知道你的测试代码是怎么写的呢？

解决方案二：
文件接受处理的时候数据编码大小是否控制对了

解决方案三：
大于，大了多少？
先检查一下接收过程，统计一下接收到的大小是否正确？如果不正确，可能是发送端就出错了；如果正确，则是可能是写文件出错了。