本文實例講述了java實作兩台伺服器間文件複製的方法。分享給大家供大家參考。具體分析如下：
通常我們使用最多的檔案複製功能就是同伺服器之間的檔案複製功能，這裡介紹的是在普通檔案複製上功能升級，可以實現兩台伺服器實作檔案的複製，下面一起來看看程式碼。
1.伺服器端
複製程式碼如下:package sterning;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class ServerTest {
int port = 8821;
void start() {
Socket s = null;
try {
ServerSocket ss = new ServerSocket(port);
while (true) {
// 選擇進行傳輸的文件
String filePath = "D://lib.rar";
File fi = new File(filePath);
System.out.println("檔案長度:" + (int) fi.length());
// public Socket accept() throws
// IOException偵聽並接受到此套接字的連線。此方法在進行連接之前一直阻塞。
s = ss.accept();
System.out.println("建立socket連結");
DataInputStream dis = new DataInputStream(new BufferedInputStream(s.getInputStream()));
dis.readByte();
DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));
DataOutputStream ps = new DataOutputStream(s.getOutputStream());
//將檔案名稱及長度傳給客戶端。這裡要真正適用所有平台，例如中文名的處理，還需要加工，具體可以參考Think In Java 4th裡有現成的程式碼。
ps.writeUTF(fi.getName());
ps.flush();
ps.writeLong((long) fi.length());
ps.flush();
int bufferSize = 8192;
byte[] buf = new byte[bufferSize];
while (true) {
int read = 0;
if (fis != null) {
read = fis.read(buf);
}
if (read == -1) {
break;
}
ps.write(buf, 0, read);
}
ps.flush();
// 注意關閉socket連結哦，不然客戶端會等待server的資料過來，
// 直到socket逾時，導致資料不完整。
fis.close();
s.close();
System.out.println("檔案傳輸完成");
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String arg[]) {
new ServerTest().start();
}
}
2.socket的Util輔助類
複製程式碼如下:package sterning;
import java.net.*;
import java.io.*;
public class ClientSocket {
private String ip;
private int port;
private Socket socket = null;
DataOutputStream out = null;
DataInputStream getMessageStream = null;
public ClientSocket(String ip, int port) {
this.ip = ip;
this.port = port;
}
/** *//**
* 建立socket連接
*
* @throws Exception
* exception
*/
public void CreateConnection() throws Exception {
try {
socket = new Socket(ip, port);
} catch (Exception e) {
e.printStackTrace();
if (socket != null)
socket.close();
throw e;
} finally {
}
}
public void sendMessage(String sendMessage) throws Exception {
try {
out = new DataOutputStream(socket.getOutputStream());
if (sendMessage.equals("Windows")) {
out.writeByte(0x1);
out.flush();
return;
}
if (sendMessage.equals("Unix")) {
out.writeByte(0x2);
out.flush();
return;
}
if (sendMessage.equals("Linux")) {
out.writeByte(0x3);
out.flush();
} else {
out.writeUTF(sendMessage);
out.flush();
}
} catch (Exception e) {
e.printStackTrace();
if (out != null)
out.close();
throw e;
} finally {
}
}
public DataInputStream getMessageStream() throws Exception {
try {
getMessageStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
return getMessageStream;
} catch (Exception e) {
e.printStackTrace();
if (getMessageStream != null)
getMessageStream.close();
throw e;
} finally {
}
}
public void shutDownConnection() {
try {
if (out != null)
out.close();
if (getMessageStream != null)
getMessageStream.close();
if (socket != null)
socket.close();
} catch (Exception e) {
}
}
}
3.客戶端
複製程式碼如下:package sterning;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
public class ClientTest {
private ClientSocket cs = null;
private String ip = "localhost";// 設定成伺服器IP private int port = 8821;
private String sendMessage = "Windwos";
public ClientTest() {
try {
if (createConnection()) {
sendMessage();
getMessage();
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
private boolean createConnection() {
cs = new ClientSocket(ip, port);
try {
cs.CreateConnection();
System.out.print("連線伺服器成功!" + "/n");
return true;
} catch (Exception e) {
System.out.print("連線伺服器失敗!" + "/n");
return false;
}
}
private void sendMessage() {
if (cs == null)
return;
try {
cs.sendMessage(sendMessage);
} catch (Exception e) {
System.out.print("發送訊息失敗!" + "/n");
}
}
private void getMessage() {
if (cs == null)
return;
DataInputStream inputStream = null;
try {
inputStream = cs.getMessageStream();
} catch (Exception e) {
System.out.print("接收訊息快取錯誤/n");
return;
}
try {
//本機儲存路徑，檔案名稱會自動從伺服器端繼承而來。
String savePath = "E://";
int bufferSize = 8192;
byte[] buf = new byte[bufferSize];
int passedlen = 0;
長 len=0;
savePath += inputStream.readUTF();
DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(new BufferedOutputStream(new FileOutputStream(savePath))));
len = inputStream.readLong();
System.out.println("檔案的長度為:" + len + "/n");
System.out.println("開始接收檔案!" + "/n");
while (true) {
int read = 0;
if (inputStream != null) {
read = inputStream.read(buf);
}
passedlen += read;
if (read == -1) {
break;
}
//下面進度條本為圖形介面的prograssBar做的，這裡如果是打文件，可能會重複列印出一些相同的百分比
System.out.println("檔案接收了" + (passedlen * 100/ len) + "%/n");
fileOut.write(buf, 0, read);
}
System.out.println("接收完成，檔案儲存為" + savePath + "/n");
fileOut.close();
} catch (Exception e) {
System.out.println("接收訊息錯誤" + "/n");
return;
}
}
public static void main(String arg[]) {
new ClientTest();
}
}
希望本文所述對大家的java程式設計有幫助。