需求分析:今天有人提了这么一个问题,就是在两个服务器进行文件传递,在问过没有什么特殊需求之后提供如下demo。
文件传输1_FTP
如果在服务器是支持FTP传输的那就好办了,直接使用FTP进行文件传输就行,以下提供FTP工具类,在这里就不进行演示了,都是比较简单的东西,看下就明白了。
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.net.SocketException;
import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import lombok.extern.slf4j.Slf4j;
@Slf4j(topic="文件上传/下载===ftp服务器:")
public class FtpUtil {
private static FTPClient mFTPClient = new FTPClient();
private static FtpUtil ftp = new FtpUtil();
public FtpUtil() {
// 在控制台打印操作过程
mFTPClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
}
/**
* 上传文件到ftp服务器
*/
public static boolean ftpUpload(String fileName, String ftpUrl, int ftpPort,
String ftpUsername, String ftpPassword, String ftpLocalDir, String ftpRemotePath) {
boolean result = false;
try {
boolean isConnection = ftp.openConnection(ftpUrl, ftpPort, ftpUsername, ftpPassword);
if (isConnection) {
boolean isSuccess = ftp.upload(ftpRemotePath, ftpLocalDir + "/" + fileName);
if (isSuccess) {
log.info("文件上传成功!");
result = true;
} else {
log.info("文件上传失败!");
result = false;
}
ftp.logout();
} else {
log.info("链接ftp服务器失败,请检查配置信息是否正确!");
result = false;
}
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
/**
* 从ftp服务器下载文件到本地
*/
public static boolean ftpDownload(String fileName, String ftpUrl, int ftpPort,
String ftpUsername, String ftpPassword, String ftpRemotePath, String ftpDownDir) {
boolean result = false;
try {
boolean isConnection = ftp.openConnection(ftpUrl, ftpPort, ftpUsername, ftpPassword);
if (isConnection) {
boolean isDownloadOk = ftp.downLoad(fileName, ftpDownDir);
boolean isCreateOk = ftp.createDirectory(ftpRemotePath, ftp.mFTPClient);
if (isDownloadOk && isCreateOk) {
log.info("文件下载成功!");
result = true;
} else {
log.info("文件下载失败!");
result = false;
}
ftp.logout();
} else {
log.info("链接ftp服务器失败,请检查配置信息是否正确!");
result = false;
}
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
/**
* 连接ftp服务器
*
* @param host
* ip地址
* @param port
* 端口号
* @param account
* 账号
* @param pwd
* 密码
* @return 是否连接成功
* @throws SocketException
* @throws IOException
*/
private boolean openConnection(String host, int port, String account, String pwd)
throws SocketException, IOException {
mFTPClient.setControlEncoding("UTF-8");
mFTPClient.connect(host, port);
if (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
mFTPClient.login(account, pwd);
if (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
System.err.println(mFTPClient.getSystemType());
FTPClientConfig config = new FTPClientConfig(mFTPClient.getSystemType().split(" ")[0]);
config.setServerLanguageCode("zh");
mFTPClient.configure(config);
return true;
}
}
disConnection();
return false;
}
/**
* 登出并断开连接
*/
public void logout() {
System.err.println("logout");
if (mFTPClient.isConnected()) {
System.err.println("logout");
try {
mFTPClient.logout();
disConnection();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 断开连接
*/
private void disConnection() {
if (mFTPClient.isConnected()) {
try {
mFTPClient.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 下载文件到本地地址
*
* @param remotePath
* 远程地址
* @param loacal
* 本地地址
* @throws IOException
*/
public boolean downLoad(String remotePath, String localDir) throws IOException {
// 进入被动模式
mFTPClient.enterLocalPassiveMode();
// 以二进制进行传输数据
mFTPClient.setFileType(FTP.BINARY_FILE_TYPE);
FTPFile[] ftpFiles = mFTPClient.listFiles(remotePath);
if (ftpFiles == null || ftpFiles.length == 0) {
log.info("远程文件不存在");
return false;
} else if (ftpFiles.length > 1) {
log.info("远程文件是文件夹");
return false;
}
long lRemoteSize = ftpFiles[0].getSize();
// 本地文件的地址
File localFileDir = new File(localDir);
if (!localFileDir.exists()) {
localFileDir.mkdirs();
}
File localFile = new File(localFileDir, ftpFiles[0].getName());
long localSize = 0;
FileOutputStream fos = null;
if (localFile.exists()) {
if (localFile.length() == lRemoteSize) {
System.err.println("已经下载完毕");
return true;
} else if (localFile.length() < lRemoteSize) {
// 要下载的文件存在,进行断点续传
localSize = localFile.length();
mFTPClient.setRestartOffset(localSize);
fos = new FileOutputStream(localFile, true);
}
}
if (fos == null) {
fos = new FileOutputStream(localFile);
}
InputStream is = mFTPClient.retrieveFileStream(remotePath);
byte[] buffers = new byte[1024];
long step = lRemoteSize / 10;
long process = localSize / step;
int len = -1;
while ((len = is.read(buffers)) != -1) {
fos.write(buffers, 0, len);
localSize += len;
long newProcess = localSize / step;
if (newProcess > process) {
process = newProcess;
System.err.println("下载进度:" + process);
}
}
is.close();
fos.close();
boolean isDo = mFTPClient.completePendingCommand();
if (isDo) {
System.err.println("下载成功");
} else {
System.err.println("下载失败");
}
return isDo;
}
/**
* 创建远程目录
*
* @param remote
* 远程目录
* @param ftpClient
* ftp客户端
* @return 是否创建成功
* @throws IOException
*/
public boolean createDirectory(String remote, FTPClient ftpClient) throws IOException {
String dirctory = remote.substring(0, remote.lastIndexOf("/") + 1);
if (!dirctory.equalsIgnoreCase("/") && !ftpClient.changeWorkingDirectory(dirctory)) {
int start = 0;
int end = 0;
if (dirctory.startsWith("/")) {
start = 1;
}
end = dirctory.indexOf("/", start);
while (true) {
String subDirctory = remote.substring(start, end);
if (!ftpClient.changeWorkingDirectory(subDirctory)) {
if (ftpClient.makeDirectory(subDirctory)) {
ftpClient.changeWorkingDirectory(subDirctory);
} else {
System.err.println("创建目录失败");
return false;
}
}
start = end + 1;
end = dirctory.indexOf("/", start);
if (end <= start) {
break;
}
}
}
return true;
}
/**
* 上传的文件
*
* @param remotePath
* 上传文件的路径地址(文件夹地址)
* @param localPath
* 本地文件的地址
* @throws IOException
* 异常
*/
public boolean upload(String remotePath, String localPath) throws IOException {
// 进入被动模式
mFTPClient.enterLocalPassiveMode();
// 以二进制进行传输数据
mFTPClient.setFileType(FTP.BINARY_FILE_TYPE);
File localFile = new File(localPath);
if (!localFile.exists()) {
System.err.println("本地文件不存在");
return false;
}
String fileName = localFile.getName();
if (remotePath.contains("/")) {
boolean isCreateOk = createDirectory(remotePath, mFTPClient);
if (!isCreateOk) {
System.err.println("文件夹创建失败");
return false;
}
}
// 列出ftp服务器上的文件
FTPFile[] ftpFiles = mFTPClient.listFiles(remotePath);
long remoteSize = 0l;
String remoteFilePath = remotePath + "/" + fileName;
if (ftpFiles.length > 0) {
FTPFile mFtpFile = null;
for (FTPFile ftpFile : ftpFiles) {
if (ftpFile.getName().endsWith(fileName)) {
mFtpFile = ftpFile;
break;
}
}
if (mFtpFile != null) {
remoteSize = mFtpFile.getSize();
if (remoteSize == localFile.length()) {
System.err.println("文件已经上传成功");
return true;
}
if (remoteSize > localFile.length()) {
if (!mFTPClient.deleteFile(remoteFilePath)) {
System.err.println("服务端文件操作失败");
} else {
boolean isUpload = uploadFile(remoteFilePath, localFile, 0);
System.err.println("是否上传成功:" + isUpload);
}
return true;
}
if (!uploadFile(remoteFilePath, localFile, remoteSize)) {
System.err.println("文件上传成功");
return true;
} else {
// 断点续传失败删除文件,重新上传
if (!mFTPClient.deleteFile(remoteFilePath)) {
System.err.println("服务端文件操作失败");
} else {
boolean isUpload = uploadFile(remoteFilePath, localFile, 0);
System.err.println("是否上传成功:" + isUpload);
}
return true;
}
}
}
boolean isUpload = uploadFile(remoteFilePath, localFile, remoteSize);
System.err.println("是否上传成功:" + isUpload);
return isUpload;
}
/**
* 上传文件
*
* @param remoteFile
* 包含文件名的地址
* @param localFile
* 本地文件
* @param remoteSize
* 服务端已经存在的文件大小
* @return 是否上传成功
* @throws IOException
*/
private boolean uploadFile(String remoteFile, File localFile, long remoteSize) throws IOException {
long step = localFile.length() / 10;
long process = 0;
long readByteSize = 0;
RandomAccessFile randomAccessFile = new RandomAccessFile(localFile, "r");
OutputStream os = mFTPClient.appendFileStream(remoteFile);
if (remoteSize > 0) {
// 已经上传一部分的时候就要进行断点续传
process = remoteSize / step;
readByteSize = remoteSize;
randomAccessFile.seek(remoteSize);
mFTPClient.setRestartOffset(remoteSize);
}
byte[] buffers = new byte[1024];
int len = -1;
while ((len = randomAccessFile.read(buffers)) != -1) {
os.write(buffers, 0, len);
readByteSize += len;
long newProcess = readByteSize / step;
if (newProcess > process) {
process = newProcess;
System.err.println("当前上传进度为:" + process);
}
}
os.flush();
randomAccessFile.close();
os.close();
boolean result = mFTPClient.completePendingCommand();
return result;
}
}
文件传输2_socket
在没有FTP的情况下呢,可以开启一个socket服务进行文件传输,提供以下demo。
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.Socket;
/**
* 文件传输Client端<br>
* 功能说明:
*
* @version 1.0
*/
public class FileTransferClient extends Socket {
private static final String SERVER_IP = "127.0.0.1"; // 服务端IP
private static final int SERVER_PORT = 8899; // 服务端端口
private Socket client;
private FileInputStream fis;
private DataOutputStream dos;
/**
* 构造函数<br/>
* 与服务器建立连接
* @throws Exception
*/
public FileTransferClient() throws Exception {
super(SERVER_IP, SERVER_PORT);
this.client = this;
System.out.println("Cliect[port:" + client.getLocalPort() + "] 成功连接服务端");
}
/**
* 向服务端传输文件
* @throws Exception
*/
public void sendFile() throws Exception {
try {
File file = new File("D:\\tools\\jd-gui-windows-1.6.5.zip");
if(file.exists()) {
fis = new FileInputStream(file);
dos = new DataOutputStream(client.getOutputStream());
// 文件名和长度
dos.writeUTF(file.getName());
dos.flush();
dos.writeLong(file.length());
dos.flush();
// 开始传输文件
System.out.println("======== 开始传输文件 ========");
byte[] bytes = new byte[1024];
int length = 0;
long progress = 0;
while((length = fis.read(bytes, 0, bytes.length)) != -1) {
dos.write(bytes, 0, length);
dos.flush();
progress += length;
System.out.print("| " + (100*progress/file.length()) + "% |");
}
System.out.println();
System.out.println("======== 文件传输成功 ========");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(fis != null)
fis.close();
if(dos != null)
dos.close();
client.close();
}
}
/**
* 入口
* @param args
*/
public static void main(String[] args) {
try {
FileTransferClient client = new FileTransferClient(); // 启动客户端连接
client.sendFile(); // 传输文件
} catch (Exception e) {
e.printStackTrace();
}
}
}
import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.math.RoundingMode;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.DecimalFormat;
/**
* 文件传输Server端<br>
* 功能说明:
*
* @author 大智若愚的小懂
* @Date 2016年09月01日
* @version 1.0
*/
public class FileTransferServer extends ServerSocket {
private static final int SERVER_PORT = 8899; // 服务端端口
private static DecimalFormat df = null;
static {
// 设置数字格式,保留一位有效小数
df = new DecimalFormat("#0.0");
df.setRoundingMode(RoundingMode.HALF_UP);
df.setMinimumFractionDigits(1);
df.setMaximumFractionDigits(1);
}
public FileTransferServer() throws Exception {
super(SERVER_PORT);
}
/**
* 使用线程处理每个客户端传输的文件
* @throws Exception
*/
public void load() throws Exception {
while (true) {
// server尝试接收其他Socket的连接请求,server的accept方法是阻塞式的
Socket socket = this.accept();
/**
* 我们的服务端处理客户端的连接请求是同步进行的, 每次接收到来自客户端的连接请求后,
* 都要先跟当前的客户端通信完之后才能再处理下一个连接请求。 这在并发比较多的情况下会严重影响程序的性能,
* 为此,我们可以把它改为如下这种异步处理与客户端通信的方式
*/
// 每接收到一个Socket就建立一个新的线程来处理它
new Thread(new Task(socket)).start();
}
}
/**
* 处理客户端传输过来的文件线程类
*/
class Task implements Runnable {
private Socket socket;
private DataInputStream dis;
private FileOutputStream fos;
public Task(Socket socket) {
this.socket = socket;
}
@Override
public void run() {
try {
dis = new DataInputStream(socket.getInputStream());
// 文件名和长度
String fileName = dis.readUTF();
long fileLength = dis.readLong();
File directory = new File("D:\\FTCache");
if(!directory.exists()) {
directory.mkdir();
}
File file = new File(directory.getAbsolutePath() + File.separatorChar + fileName);
fos = new FileOutputStream(file);
// 开始接收文件
byte[] bytes = new byte[1024];
int length = 0;
while((length = dis.read(bytes, 0, bytes.length)) != -1) {
fos.write(bytes, 0, length);
fos.flush();
}
System.out.println("======== 文件接收成功 [File Name:" + fileName + "] [Size:" + getFormatFileSize(fileLength) + "] ========");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if(fos != null)
fos.close();
if(dis != null)
dis.close();
socket.close();
} catch (Exception e) {}
}
}
}
/**
* 格式化文件大小
* @param length
* @return
*/
private String getFormatFileSize(long length) {
double size = ((double) length) / (1 << 30);
if(size >= 1) {
return df.format(size) + "GB";
}
size = ((double) length) / (1 << 20);
if(size >= 1) {
return df.format(size) + "MB";
}
size = ((double) length) / (1 << 10);
if(size >= 1) {
return df.format(size) + "KB";
}
return length + "B";
}
/**
* 入口
* @param args
*/
public static void main(String[] args) {
try {
FileTransferServer server = new FileTransferServer(); // 启动服务端
server.load();
} catch (Exception e) {
e.printStackTrace();
}
}
}
今天就推荐着两种方案。