diff --git a/.gitignore b/.gitignore
index 84170b2..7636016 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+testDir
+testFile
+
 *.class
 
 # Mobile Tools for Java (J2ME)
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..f74504a
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,14 @@
+group 'com.githun.nizshee'
+version '1.0-SNAPSHOT'
+
+apply plugin: 'java'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+}
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e582b84
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Wed Oct 12 12:15:41 MSK 2016
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.13-bin.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..27309d9
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..f6d5974
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..f805b28
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'hw12'
+
diff --git a/src/main/java/com/github/nizshee/client/Client.java b/src/main/java/com/github/nizshee/client/Client.java
new file mode 100644
index 0000000..790d40e
--- /dev/null
+++ b/src/main/java/com/github/nizshee/client/Client.java
@@ -0,0 +1,48 @@
+package com.github.nizshee.client;
+
+
+import com.github.nizshee.shared.ListMethod;
+import com.github.nizshee.shared.Method;
+import com.github.nizshee.shared.RemoteFile;
+
+import java.io.*;
+import java.net.Socket;
+import java.util.List;
+
+@SuppressWarnings("all")
+public class Client {
+
+    private final String host;
+    private final int port;
+
+    public Client(String host, int port) throws IOException {
+        this.host = host;
+        this.port = port;
+    }
+
+    public List<RemoteFile> getList(String name) throws IOException {
+        return Method.getValue(new Socket(host, port), 1, new ListMethod(), name);
+    }
+
+    public void getFile(String name) throws IOException {
+        try (Socket socket = new Socket(host, port)) {
+            DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
+            dos.writeInt(2);
+            dos.writeUTF(name);
+            DataInputStream dis = new DataInputStream(socket.getInputStream());
+            long size = dis.readLong();
+            byte[] buffer = new byte[1024];
+            File file = new File(name);
+            try (FileOutputStream fos = new FileOutputStream(file)) {
+                long total = 0;
+                int partSize = 0;
+                while (partSize != -1 && total < size) {
+                    fos.write(buffer, 0, (int) Math.min(size - total, partSize));
+                    total += partSize;
+                    partSize = dis.read(buffer);
+                }
+                if (total != size) throw new IOException("Not enough bytes");
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/github/nizshee/client/ClientMain.java b/src/main/java/com/github/nizshee/client/ClientMain.java
new file mode 100644
index 0000000..138d9cb
--- /dev/null
+++ b/src/main/java/com/github/nizshee/client/ClientMain.java
@@ -0,0 +1,30 @@
+package com.github.nizshee.client;
+
+
+import com.github.nizshee.shared.RemoteFile;
+
+import java.util.List;
+
+public class ClientMain {
+
+    public static void main(String[] args) throws Exception {
+        Client client = new Client("localhost", 8080);
+
+        if (args.length == 2 && args[0].equals("list")) {
+            List<RemoteFile> list = client.getList(args[1]);
+            for (RemoteFile file: list) {
+                System.out.print(file + " ");
+                if (file.isDirectory) {
+                    System.out.println("<dir>");
+                } else {
+                    System.out.println();
+                }
+            }
+        } else if (args.length == 2 && args[0].equals("get")) {
+            client.getFile(args[1]);
+            System.out.println("file downloaded");
+        } else {
+            System.out.println("usage: list <path> | get <file>");
+        }
+    }
+}
diff --git a/src/main/java/com/github/nizshee/server/CopyFileHandler.java b/src/main/java/com/github/nizshee/server/CopyFileHandler.java
new file mode 100644
index 0000000..3a80eda
--- /dev/null
+++ b/src/main/java/com/github/nizshee/server/CopyFileHandler.java
@@ -0,0 +1,27 @@
+package com.github.nizshee.server;
+
+
+import java.io.*;
+
+
+@SuppressWarnings("all")
+public class CopyFileHandler implements Handler {
+    @Override
+    public void handle(DataInputStream dis, DataOutputStream dos) throws IOException {
+        String name = dis.readUTF();
+        File file = new File(name);
+        try (FileInputStream fis = new FileInputStream(file)) {
+            if (!file.exists()) {
+                dos.writeLong(0);
+                return;
+            }
+            dos.writeLong(file.length());
+            byte[] buffer = new byte[1024];
+            int size = 0;
+            while (size != -1) {
+                dos.write(buffer, 0, size);
+                size = fis.read(buffer);
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/github/nizshee/server/Handler.java b/src/main/java/com/github/nizshee/server/Handler.java
new file mode 100644
index 0000000..b17a800
--- /dev/null
+++ b/src/main/java/com/github/nizshee/server/Handler.java
@@ -0,0 +1,12 @@
+package com.github.nizshee.server;
+
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+public interface Handler {
+
+    void handle(DataInputStream dis, DataOutputStream dos) throws IOException;
+
+}
diff --git a/src/main/java/com/github/nizshee/server/MethodWrapper.java b/src/main/java/com/github/nizshee/server/MethodWrapper.java
new file mode 100644
index 0000000..1e5daeb
--- /dev/null
+++ b/src/main/java/com/github/nizshee/server/MethodWrapper.java
@@ -0,0 +1,23 @@
+package com.github.nizshee.server;
+
+
+import com.github.nizshee.shared.Method;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+public class MethodWrapper<Request, Response> implements Handler {
+    private final Method<Request, Response> method;
+
+    public MethodWrapper(Method<Request, Response> method) {
+        this.method = method;
+    }
+
+    @Override
+    public void handle(DataInputStream dis, DataOutputStream dos) throws IOException {
+        Request request = method.readRequest(dis);
+        Response response = method.execute(request);
+        method.writeResponse(dos, response);
+    }
+}
diff --git a/src/main/java/com/github/nizshee/server/Server.java b/src/main/java/com/github/nizshee/server/Server.java
new file mode 100644
index 0000000..d7189c0
--- /dev/null
+++ b/src/main/java/com/github/nizshee/server/Server.java
@@ -0,0 +1,82 @@
+package com.github.nizshee.server;
+
+
+import com.github.nizshee.shared.ServerNotRunningException;
+import com.github.nizshee.shared.ServerRunningException;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.*;
+import java.util.Map;
+
+public class Server {
+
+    private final InetAddress host;
+    private final Integer port;
+    private ServerSocket socket = null;
+
+    public Server(InetAddress host, Integer port) {
+        this.host = host;
+        this.port = port;
+    }
+
+    public synchronized void start(Map<Integer, Handler> handlers) throws IOException, ServerRunningException {
+        if (socket != null) throw new ServerRunningException();
+        socket = new ServerSocket(port, 50, host);
+        Thread thread = new Thread(new ServerRunnable(socket, handlers));
+        thread.start();
+    }
+
+    @SuppressWarnings("all")
+    public void startSync(Map<Integer, Handler> handlers)
+            throws IOException, ServerRunningException {
+        synchronized (this) {
+            if (socket != null) throw new ServerRunningException();
+            socket = new ServerSocket(port, 50, host);
+        }
+        (new ServerRunnable(socket, handlers)).run();
+    }
+
+    public synchronized void stop() throws IOException, ServerNotRunningException {
+        if (socket == null) throw new ServerNotRunningException();
+        socket.close();
+        socket = null;
+    }
+
+    private static class ServerRunnable implements Runnable {
+
+        private final ServerSocket serverSocket;
+        private final Map<Integer, Handler> handlers;
+
+        ServerRunnable(ServerSocket serverSocket, Map<Integer, Handler> handlers) {
+            this.serverSocket = serverSocket;
+            this.handlers = handlers;
+        }
+
+        public void run() {
+            try {
+                System.out.println("Server started.");
+                //noinspection InfiniteLoopStatement
+                while (true) {
+                    Socket socket = serverSocket.accept();
+                    try {
+                        DataInputStream dis = new DataInputStream(socket.getInputStream());
+                        DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
+                        Integer key = dis.readInt();
+                        if (handlers.containsKey(key)) {
+                            Handler wrapper = handlers.get(key);
+                            wrapper.handle(dis, dos);
+                        }
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    } finally {
+                        socket.close();
+                    }
+                }
+            } catch (IOException e) {
+                System.err.println(e.getMessage());
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/github/nizshee/server/ServerMain.java b/src/main/java/com/github/nizshee/server/ServerMain.java
new file mode 100644
index 0000000..d55c772
--- /dev/null
+++ b/src/main/java/com/github/nizshee/server/ServerMain.java
@@ -0,0 +1,25 @@
+package com.github.nizshee.server;
+
+
+import com.github.nizshee.shared.ListMethod;
+
+import java.net.InetAddress;
+import java.util.HashMap;
+import java.util.Map;
+
+@SuppressWarnings("all")
+public class ServerMain {
+
+    private final static Map<Integer, Handler> HANDLERS;
+
+    static {
+        HANDLERS = new HashMap<>();
+        HANDLERS.put(1, new MethodWrapper(new ListMethod()));
+        HANDLERS.put(2, new CopyFileHandler());
+    }
+
+    public static void main(String[] args) throws Exception {
+        Server server = new Server(InetAddress.getByName("localhost"), 8080);
+        server.startSync(HANDLERS);
+    }
+}
diff --git a/src/main/java/com/github/nizshee/shared/ListMethod.java b/src/main/java/com/github/nizshee/shared/ListMethod.java
new file mode 100644
index 0000000..839e9c8
--- /dev/null
+++ b/src/main/java/com/github/nizshee/shared/ListMethod.java
@@ -0,0 +1,56 @@
+package com.github.nizshee.shared;
+
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.*;
+
+public class ListMethod implements Method<String, List<RemoteFile>> {
+
+    @Override
+    public List<RemoteFile> execute(String name) {
+        Path dir = Paths.get(name);
+        File[] files = dir.toFile().listFiles();
+        if (files == null) return Collections.emptyList();
+        List<RemoteFile> list = new LinkedList<>();
+        for (File file: files) {
+            list.add(new RemoteFile(file.getName(), file.isDirectory()));
+        }
+        return list;
+    }
+
+    @Override
+    public void writeRequest(DataOutputStream dos, String s) throws IOException {
+        dos.writeUTF(s);
+    }
+
+    @Override
+    public String readRequest(DataInputStream dis) throws IOException {
+        return dis.readUTF();
+    }
+
+    @Override
+    public void writeResponse(DataOutputStream dos, List<RemoteFile> remoteFiles) throws IOException {
+        dos.writeInt(remoteFiles.size());
+        for (RemoteFile file: remoteFiles) {
+            dos.writeUTF(file.name);
+            dos.writeBoolean(file.isDirectory);
+        }
+    }
+
+    @Override
+    public List<RemoteFile> readResult(DataInputStream dis) throws IOException {
+        int size = dis.readInt();
+        List<RemoteFile> list = new LinkedList<>();
+        for (int i = 0; i < size; ++i) {
+            String name = dis.readUTF();
+            boolean isDirectory = dis.readBoolean();
+            list.add(new RemoteFile(name, isDirectory));
+        }
+        return list;
+    }
+}
diff --git a/src/main/java/com/github/nizshee/shared/Method.java b/src/main/java/com/github/nizshee/shared/Method.java
new file mode 100644
index 0000000..4a6fd2a
--- /dev/null
+++ b/src/main/java/com/github/nizshee/shared/Method.java
@@ -0,0 +1,30 @@
+package com.github.nizshee.shared;
+
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.Socket;
+
+public interface Method<Request, Response> {
+    Response execute(Request request);
+
+    void writeRequest(DataOutputStream dos, Request request) throws IOException;
+
+    Request readRequest(DataInputStream dis) throws IOException;
+
+    void writeResponse(DataOutputStream dos, Response response) throws IOException;
+
+    Response readResult(DataInputStream dis) throws IOException;
+
+    static <Request, Response> Response getValue(Socket socket, int code, Method<Request, Response> method, Request request)
+            throws IOException {
+        DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
+        DataInputStream dis = new DataInputStream(socket.getInputStream());
+        dos.writeInt(code);
+        method.writeRequest(dos, request);
+        Response response = method.readResult(dis);
+        socket.close();
+        return response;
+    }
+}
diff --git a/src/main/java/com/github/nizshee/shared/RemoteFile.java b/src/main/java/com/github/nizshee/shared/RemoteFile.java
new file mode 100644
index 0000000..839ef60
--- /dev/null
+++ b/src/main/java/com/github/nizshee/shared/RemoteFile.java
@@ -0,0 +1,29 @@
+package com.github.nizshee.shared;
+
+
+@SuppressWarnings("all")
+public class RemoteFile {
+
+    public final boolean isDirectory;
+    public final String name;
+
+    public RemoteFile(String name, boolean isDirectory) {
+        this.isDirectory = isDirectory;
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        return Boolean.hashCode(isDirectory) + name.hashCode() % 34;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        return o instanceof RemoteFile && ((RemoteFile) o).name.equals(name) && ((RemoteFile) o).isDirectory == isDirectory;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+}
diff --git a/src/main/java/com/github/nizshee/shared/ServerNotRunningException.java b/src/main/java/com/github/nizshee/shared/ServerNotRunningException.java
new file mode 100644
index 0000000..581c8a2
--- /dev/null
+++ b/src/main/java/com/github/nizshee/shared/ServerNotRunningException.java
@@ -0,0 +1,8 @@
+package com.github.nizshee.shared;
+
+
+public class ServerNotRunningException extends Exception {
+    public ServerNotRunningException() {
+        super("Server not running.");
+    }
+}
diff --git a/src/main/java/com/github/nizshee/shared/ServerRunningException.java b/src/main/java/com/github/nizshee/shared/ServerRunningException.java
new file mode 100644
index 0000000..0abd8e9
--- /dev/null
+++ b/src/main/java/com/github/nizshee/shared/ServerRunningException.java
@@ -0,0 +1,8 @@
+package com.github.nizshee.shared;
+
+
+public class ServerRunningException extends Exception {
+    public ServerRunningException() {
+        super("Server already running.");
+    }
+}
diff --git a/src/test/java/com/github/nizshee/ClientServerTest.java b/src/test/java/com/github/nizshee/ClientServerTest.java
new file mode 100644
index 0000000..4016896
--- /dev/null
+++ b/src/test/java/com/github/nizshee/ClientServerTest.java
@@ -0,0 +1,71 @@
+package com.github.nizshee;
+
+import com.github.nizshee.client.Client;
+import com.github.nizshee.server.MethodWrapper;
+import com.github.nizshee.server.Server;
+import com.github.nizshee.server.Handler;
+import com.github.nizshee.shared.Method;
+import org.junit.Test;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.Assert.*;
+
+@SuppressWarnings("all")
+public class ClientServerTest {
+
+    private final static int code = 0;
+    private final static AtomicBoolean trigger = new AtomicBoolean(false);
+    public static final Method<String, String> method = new Method<String, String>() {
+        @Override
+        public String execute(String s) {
+            trigger.set(true);
+            return s + s;
+        }
+
+        @Override
+        public void writeRequest(DataOutputStream dos, String s) throws IOException {
+            dos.writeUTF(s);
+        }
+
+        @Override
+        public String readRequest(DataInputStream dis) throws IOException {
+            return dis.readUTF();
+        }
+
+        @Override
+        public void writeResponse(DataOutputStream dos, String s) throws IOException {
+            dos.writeUTF(s);
+        }
+
+        @Override
+        public String readResult(DataInputStream dis) throws IOException {
+            return dis.readUTF();
+        }
+    };
+    private static final Map<Integer, Handler> handlers;
+    static {
+        handlers = new HashMap<>();
+        handlers.put(code, new MethodWrapper(method));
+    }
+
+    @Test
+    public void clientServerTest() throws Exception {
+        Server server = new Server(InetAddress.getByName("localhost"), 8080);
+        server.start(handlers);
+        Thread.sleep(500);
+        Client client = new Client("localhost", 8080);
+        Socket socket = new Socket("localhost", 8080);
+        String result = Method.getValue(socket, code, method, "abcd");
+        assertEquals("abcdabcd", result);
+        socket.close();
+        server.stop();
+    }
+}
diff --git a/src/test/java/com/github/nizshee/shared/ListMethodTest.java b/src/test/java/com/github/nizshee/shared/ListMethodTest.java
new file mode 100644
index 0000000..452866e
--- /dev/null
+++ b/src/test/java/com/github/nizshee/shared/ListMethodTest.java
@@ -0,0 +1,64 @@
+package com.github.nizshee.shared;
+
+import org.junit.Test;
+
+import java.io.*;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class ListMethodTest {
+
+    private final static ListMethod method = new ListMethod();
+
+    @Test
+    public void applyTest() throws Exception {
+
+        @SuppressWarnings("ConstantConditions")
+        List<RemoteFile> result = method.execute(getClass().getClassLoader().getResource("test/").getPath());
+        assertEquals(Arrays.asList(
+                new RemoteFile("a", false),
+                new RemoteFile("b", false),
+                new RemoteFile("c", true)
+        ), result);
+
+    }
+
+    @Test
+    public void valueTest() throws Exception {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream dos = new DataOutputStream(bos);
+
+        method.writeRequest(dos, "testString1");
+        method.writeRequest(dos, "testString2");
+
+        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
+        DataInputStream dis = new DataInputStream(bis);
+
+        assertEquals("testString1", method.readRequest(dis));
+        assertEquals("testString2", method.readRequest(dis));
+    }
+
+    @Test
+    public void resultTest() throws Exception {
+        List<RemoteFile> list1 = new LinkedList<>();
+        List<RemoteFile> list2 = Arrays.asList(
+                new RemoteFile("1", true),
+                new RemoteFile("2", false),
+                new RemoteFile("3", true)
+        );
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream dos = new DataOutputStream(bos);
+
+        method.writeResponse(dos, list1);
+        method.writeResponse(dos, list2);
+
+        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
+        DataInputStream dis = new DataInputStream(bis);
+
+        assertEquals(list1, method.readResult(dis));
+        assertEquals(list2, method.readResult(dis));
+    }
+}
diff --git a/src/test/resources/test/a b/src/test/resources/test/a
new file mode 100644
index 0000000..d800886
--- /dev/null
+++ b/src/test/resources/test/a
@@ -0,0 +1 @@
+123
\ No newline at end of file
diff --git a/src/test/resources/test/b b/src/test/resources/test/b
new file mode 100644
index 0000000..bd41cba
--- /dev/null
+++ b/src/test/resources/test/b
@@ -0,0 +1 @@
+12345
\ No newline at end of file
diff --git a/src/test/resources/test/c/c b/src/test/resources/test/c/c
new file mode 100644
index 0000000..e69de29