Java利用TCP协议发送文件(三)--客户端设计

    由于项目的需要，需要在手机平台上面进行传输，但是，由于android平台的开发环境比较容易使用，而且免费，同时，因为在编写数据包的时候，已经在数据包中加入了发送数据包和接收数据包的函数，因此，考虑到开发投入的情况下，选择了使用Android平台。
    由于在Android的应用大部分是使用Java进行开发的，而在Android中，并没有特殊的TCP的API，Android使用的TCP就是标准的Java的TCP的类，因此对于Android客户端来说，只需要将服务器版本的数据包代码中使用到TCP进行传输的代码，也就是Transfer.java进行简单的修改即可。

    具体的代码如下：

/** *  */package edu.pkusz.sheng;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.net.Socket;/** * @author sheng * */public class Transfer{private static Socket ClientSocket = null;private static BufferedOutputStream SocketOutputStream = null;private static BufferedInputStream  SocketInputStream  = null;private static void CreateSocket(){try {ClientSocket = new Socket(CONSTANT.IP, CONSTANT.PORT);}catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}private static void CreateSocketOutputStream(){if (ClientSocket == null){CreateSocket();}try {SocketOutputStream = new BufferedOutputStream(ClientSocket.getOutputStream());}catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}private static void CreateSocketInputStream(){if (ClientSocket == null){CreateSocket();}try {SocketInputStream = new BufferedInputStream(ClientSocket.getInputStream());}catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static boolean SendPackage(DataPackage PackageOfData){if (SocketOutputStream == null){CreateSocketOutputStream();}return PackageOfData.Send(SocketOutputStream);}public static boolean SendPackage(BufferedInputStream InputFile, PackageType Type, int LenOfData) throws IOException{final int LENOFCONTENT = BufferSize.BUFFERSIZE - BufferSize.PACKAGEHEADERSIZE;// The number of packages.int NumberOfPackages = LenOfData / LENOFCONTENT;if ((LenOfData % LENOFCONTENT) != 0){NumberOfPackages++;}DataPackage PackageOfData = new DataPackage(false);// set the type and the number of packages.PackageOfData.SetType(Type);PackageOfData.SetNumberOfPackages(NumberOfPackages);boolean result = false;byte[] TmpBuffer = new byte[LENOFCONTENT];int Len = 0;int IndexOfPackages = 1;while ((Len = InputFile.read(TmpBuffer)) != -1){PackageOfData.SetIndexOfPackages(IndexOfPackages);PackageOfData.SetSizeOfData(Len);// set contentPackageOfData.SetContent(TmpBuffer);// send dataresult = SendPackage(PackageOfData);IndexOfPackages++;}return result;}public static boolean SendString(PackageType Type, String InputString){if (InputString.length() > BufferSize.BUFFERSIZE){return false;}DataPackage PackageOfData = new DataPackage(false);// set the package headerPackageOfData.SetType(Type);PackageOfData.SetNumberOfPackages(1);PackageOfData.SetIndexOfPackages(1);PackageOfData.SetSizeOfData(InputString.length());// set the contentPackageOfData.SetContent(InputString.getBytes());return SendPackage(PackageOfData);}public static boolean SendUserName(String UserName){PackageType Type = PackageType.USERNAME;return SendString(Type, UserName);}public static boolean SendAuthorisztionRequest(){PackageType Type = PackageType.REQUESTAUTHORIZATION;String Request = new String("RequestAuthorization");return SendString(Type, Request);}public static boolean SendRequest(){PackageType Type = PackageType.REQUESTRESULT;String Request = new String("Request");return SendString(Type, Request);}public static boolean SendTextRequest(){PackageType Type = PackageType.REQUESTTEXT;String Request = new String("TextRequest");return SendString(Type, Request);}public static boolean SendClosedRequest(){PackageType Type = PackageType.CLOSED;String Request = new String("Closed");boolean result = SendString(Type, Request);try {result = Close();}catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return result;}public static boolean SendFile(String FileName) throws IOException{File RawFile = null;BufferedInputStream InputFile = null;try {RawFile = new File(FileName);InputFile = new BufferedInputStream(new FileInputStream(RawFile));}catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}int Len = (int) RawFile.length();PackageType Type = PackageType.FILEDATA;boolean result = false;result = SendPackage(InputFile, Type, Len);InputFile.close();return result;}public static boolean Close() throws IOException{if (SocketInputStream != null){SocketInputStream.close();}if (SocketOutputStream != null){SocketOutputStream.close();}if (ClientSocket != null){ClientSocket.close();}return true;}public static String ReceiveString(PackageType Type){DataPackage Data = new DataPackage(true);boolean run = true;if (SocketInputStream == null){CreateSocketInputStream();}while (run){int Len = 0;if ((Len = Data.Receive(SocketInputStream)) != -1){if (Data.GetType() == Type){run = false;}}}return new String(Data.Content, 0, Data.SizeOfData);}public static String ReceiveText(){PackageType Type = PackageType.REPLAYTEXT;return ReceiveString(Type);}public static String ReceiveUserName(){PackageType Type = PackageType.USERNAME;return ReceiveString(Type);}public static String ReceiveAuthorizen(){PackageType Type = PackageType.REPLAYAUTHORIZATION;return ReceiveString(Type);}public static String ReceiveResult(){PackageType Type = PackageType.REPLAYRESULT;return ReceiveString(Type);}}