diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..26d33521af10bcc7fd8cea344038eaaeb78d0ef5
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000000000000000000000000000000000000..5d8859c016a460088c8434eda6b0e6357a4770ac
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="CompilerConfiguration">
+ <annotationProcessing>
+ <profile name="Maven default annotation processors profile" enabled="true">
+ <sourceOutputDir name="target/generated-sources/annotations" />
+ <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+ <outputRelativeToContentRoot value="true" />
+ <module name="FileSharing" />
+ </profile>
+ </annotationProcessing>
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
new file mode 100644
index 0000000000000000000000000000000000000000..aa00ffab7828f4818589659c804ec2cfd99baed3
--- /dev/null
+++ b/.idea/encodings.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="Encoding">
+ <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+ <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
new file mode 100644
index 0000000000000000000000000000000000000000..712ab9d985c20018a0c97b93d2148ac1ffe588a5
--- /dev/null
+++ b/.idea/jarRepositories.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="RemoteRepositoriesConfiguration">
+ <remote-repository>
+ <option name="id" value="central" />
+ <option name="name" value="Central Repository" />
+ <option name="url" value="https://repo.maven.apache.org/maven2" />
+ </remote-repository>
+ <remote-repository>
+ <option name="id" value="central" />
+ <option name="name" value="Maven Central repository" />
+ <option name="url" value="https://repo1.maven.org/maven2" />
+ </remote-repository>
+ <remote-repository>
+ <option name="id" value="jboss.community" />
+ <option name="name" value="JBoss Community repository" />
+ <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+ </remote-repository>
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000000000000000000000000000000000000..accd6296789966b9f3392c7a4dc3a987a7532182
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="ExternalStorageConfigurationManager" enabled="true" />
+ <component name="MavenProjectsManager">
+ <option name="originalFiles">
+ <list>
+ <option value="$PROJECT_DIR$/pom.xml" />
+ </list>
+ </option>
+ </component>
+ <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+ <output url="file://$PROJECT_DIR$/out" />
+ </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000000000000000000000000000000000000..6c0b8635858dc7ad44b93df54b762707ce49eefc
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="VcsDirectoryMappings">
+ <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+ </component>
+</project>
\ No newline at end of file
diff --git a/pic1transferred.jpg b/pic1transferred.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..ef005e374f4b456eeeac7a6e297fac1bfaff2cb2
Binary files /dev/null and b/pic1transferred.jpg differ
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000000000000000000000000000000000000..7fa2bd56b9850ada0ec923c33a25233c39b608c9
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+
+ <groupId>org.example</groupId>
+ <artifactId>FileSharing</artifactId>
+ <version>1.0-SNAPSHOT</version>
+
+ <properties>
+ <maven.compiler.source>11</maven.compiler.source>
+ <maven.compiler.target>11</maven.compiler.target>
+ <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+ </properties>
+
+</project>
\ No newline at end of file
diff --git a/src/main/java/Client/Client.java b/src/main/java/Client/Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..a7a63b3900ceecb30038c1ceb723930e42122d21
--- /dev/null
+++ b/src/main/java/Client/Client.java
@@ -0,0 +1,67 @@
+package Client;
+import java.net.*;
+import java.io.*;
+import java.nio.ByteBuffer;
+
+
+public class Client {
+ public static void main(String[] args) {
+ Socket clientSocket = null;
+ try{
+ clientSocket = new Socket("localhost",4333);
+ // use readlink -f filename to find file in Ubuntu terminal
+ String filename = "/home/jiahueic/Downloads/pic1.jpg";
+ File myFile = new File(filename);
+ System.out.println(myFile.exists());
+ // create random access file read-only
+ RandomAccessFile targetFile = new RandomAccessFile(filename,"r");
+ // returns the length of the file, measured in bytes
+ int fileSize = (int)targetFile.length();
+ // get output stream returns an output stream for writing bytes to this socket
+ // An Input/ Output error occurs as this socket is closed
+ OutputStream out = clientSocket.getOutputStream();
+ InputStream in = clientSocket.getInputStream();
+ // read from the random access file from a certain position with a predefined buffer size
+ // before commencing with file sending, send the size of the target file first
+ System.out.println("The file size of target file is: " + fileSize);
+ out.write(ByteBuffer.allocate(4).putInt(fileSize).array());
+ byte[] recogBuff = new byte[1000];
+ in.read(recogBuff);
+ // convert recognition byte array into String
+ System.out.println("Server says: " + new String(recogBuff));
+ long pos = 0;
+ while(pos < fileSize){
+ // initialize the byte array that will be returned from reading the random access file
+ byte[] bytesToRead = new byte[1000];
+ targetFile.seek(pos);
+ targetFile.read(bytesToRead);
+ // write the bytes array read from the random access file
+ out.write(bytesToRead);
+ pos += 1000;
+ }
+ System.out.println("File transfer point is reached");
+ // remember to close the random access file after the transfer is complete
+ targetFile.close();
+
+ }
+ catch(UnknownHostException e){
+ System.out.println("Client Host: " + e.getMessage());
+ }
+ catch(IOException e){
+ e.printStackTrace();
+ }finally {
+ // close the client socket after everything is complete
+ if(clientSocket != null){
+ try{
+ clientSocket.close();
+ }
+ catch(IOException e){
+ e.printStackTrace();
+ }
+ }
+ }
+ }
+
+
+
+}
diff --git a/src/main/java/Server/Connection.java b/src/main/java/Server/Connection.java
new file mode 100644
index 0000000000000000000000000000000000000000..ef75b930c144a4c49c10aa8d0c9b972e1d0a8a65
--- /dev/null
+++ b/src/main/java/Server/Connection.java
@@ -0,0 +1,63 @@
+package Server;
+
+import java.nio.ByteBuffer;
+import java.net.*;
+import java.io.*;
+
+
+public class Connection extends Thread{
+ // how does the server save the bytes of the file read bit by bit?
+ InputStream in;
+ OutputStream out;
+ Socket clientSocket;
+ public Connection(Socket clientSocket){
+ try{
+ this.clientSocket = clientSocket;
+ in = clientSocket.getInputStream();
+ out = clientSocket.getOutputStream();
+ this.start();
+ }
+ catch(IOException e){
+ e.printStackTrace();
+ }
+ }
+ public void run(){
+ // since the file is to be transferred from client to server, we should create a new file with
+ // the same filename
+ try{
+ File newFile = new File("/home/jiahueic/Downloads/pic1transferred.jpg");
+ boolean created = newFile.createNewFile();
+ System.out.println("The new file is created: " + created);
+ RandomAccessFile fileTransferred = new RandomAccessFile(newFile,"rw");
+ // receive the filesize from the client
+ byte[] fileSizeInput = new byte[4];
+ in.read(fileSizeInput);
+ // need to send recognition to client that filesize is received
+ String recogMess = "Filesize received";
+ out.write(recogMess.getBytes());
+ int targetFileSize = ByteBuffer.wrap(fileSizeInput).getInt();
+ System.out.println("Target file size is: " + targetFileSize);
+ long pos = 0;
+ while(pos < targetFileSize){
+ // initialise a buffer array to store the data obtained from input stream
+ byte[] bufferInput = new byte[1000];
+ in.read(bufferInput);
+ // write the bufferInput into the RandomAccessFile
+ fileTransferred.seek(pos);
+ fileTransferred.write(bufferInput);
+ pos += 1000;
+ }
+ // remember to close the fileTransferred after writing everything
+ fileTransferred.close();
+ // server needs to tell client that the file is received
+ String finalMess = "Target file successfully transferred";
+ out.write(finalMess.getBytes());
+
+ }
+ catch(IOException e){
+ e.printStackTrace();
+ }
+
+
+ }
+}
diff --git a/src/main/java/Server/Server.java b/src/main/java/Server/Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..a13b279c38cf9dda80a7a4648a88584c5b231077
--- /dev/null
+++ b/src/main/java/Server/Server.java
@@ -0,0 +1,25 @@
+package Server;
+import java.net.*;
+import java.io.*;
+public class Server {
+ public static void main(String[] args) {
+ try{
+ ServerSocket serverSocket = new ServerSocket(4333);
+ int i = 0;
+ while(true){
+ System.out.println("Server listening on: " + serverSocket.getInetAddress() + ":" + serverSocket.getLocalPort());
+ Socket client = serverSocket.accept();
+ // establish new Connection
+ Connection c = new Connection(client);
+ i++;
+ System.out.println("Received connection " + i + " from"+client.getInetAddress()+":"+client.getPort());
+
+ }
+ }
+ catch(IOException e){
+ e.printStackTrace();
+ }
+
+
+ }
+}
diff --git a/src/pic1.jpg b/src/pic1.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..4b86b6cfad16b8dd577589b91b3b59f45f1fc689
Binary files /dev/null and b/src/pic1.jpg differ