Rahul/socket/read/pr4 (#6575)

* Making examples simple

* Changing variable names

* Modificatons in naming

* Review changes

core-java-networking/src/main/java/com/baeldung/socket/read/Client.java

@@ -1,35 +1,27 @@
 package com.baeldung.socket.read;
 
 import java.net.*;
+import java.nio.charset.StandardCharsets;
 import java.io.*; 
 
 public class Client {
     
-    //Initialize socket, input and output stream
-    private Socket socket = null;
-    private DataInputStream in = null;
-    private DataOutputStream out = null;
-    
     public void runClient(String ip, int port) {
         try {
-            socket = new Socket(ip, port);
+            Socket socket = new Socket(ip, port);
             System.out.println("Connected to server ...");
-            in = new DataInputStream(System.in);
+            DataInputStream in = new DataInputStream(System.in);
-            out = new DataOutputStream(socket.getOutputStream());
+            DataOutputStream out = new DataOutputStream(socket.getOutputStream());
-        } catch(Exception e) {
+            
-            e.printStackTrace();
-        }
             char type = 's'; // s for string
             int length = 29;
             String data = "This is a string of length 29";
-        byte[] dataInBytes = data.getBytes();         
+            byte[] dataInBytes = data.getBytes(StandardCharsets.UTF_8);         
             //Sending data in TLV format        
-        try {
             out.writeChar(type);
             out.writeInt(length);
             out.write(dataInBytes);
         } catch (IOException e) {
-            // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

core-java-networking/src/main/java/com/baeldung/socket/read/Server.java

@@ -1,48 +1,46 @@
 package com.baeldung.socket.read;
 
 import java.net.*;
+import java.nio.charset.StandardCharsets;
 import java.io.*; 
 
 public class Server {
     
-    //Socket and input stream
-    private Socket socket = null;
-    private ServerSocket server = null;
-    private DataInputStream in = null;
-    
     public void runServer(int port) {
         //Start the server and wait for connection
         try {
-            server = new ServerSocket(port);
+            ServerSocket server = new ServerSocket(port);
             System.out.println("Server Started. Waiting for connection ...");
-            socket = server.accept();
+            Socket socket = server.accept();
             System.out.println("Got connection from client.");
             //Get input stream from socket variable and convert the same to DataInputStream
-            in = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
+            DataInputStream in = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
             //Read type and length of data
             char dataType = in.readChar();
             int length = in.readInt();
             System.out.println("Type : "+dataType);
             System.out.println("Lenght :"+length);
+            if(dataType == 's') {
                 //Read String data in bytes
                 byte[] messageByte = new byte[length];
                 boolean end = false;
-            String dataString = "";
+                StringBuilder dataString = new StringBuilder(length);
                 int totalBytesRead = 0;
                 //We need to run while loop, to read all data in that stream
                 while(!end) {
                     int currentBytesRead = in.read(messageByte);
                     totalBytesRead = currentBytesRead + totalBytesRead;
                     if(totalBytesRead <= length) {
-                    dataString += new String(messageByte,0,currentBytesRead);   
+                        dataString.append(new String(messageByte,0,currentBytesRead,StandardCharsets.UTF_8));
                     } else {
-                    dataString += new String(messageByte,0,length - totalBytesRead + currentBytesRead); 
+                        dataString.append(new String(messageByte,0,length - totalBytesRead + currentBytesRead,StandardCharsets.UTF_8));
                     }
                     if(dataString.length()>=length) {
                         end = true;
                     }
                 }
-            System.out.println("Read "+length+" bytes of message from client. Message = "+dataString);;
+                System.out.println("Read "+length+" bytes of message from client. Message = "+dataString);
+            }
         } catch (Exception e) {
             e.printStackTrace();
         }