How to continue read InputStream in loop used Socket-connection?

In Server site, I use a loop to continue to read data sent from the client, but when I send data through from the client, the server site throw exception.

I debug the code that the server site can read the data from client, but when it finish read from the client, the loop can't stop, I guess the exception was cause by that!

How can I fixed such this problem, when the MAX_INPUT was smaller than the data send to the server, the Server can continue read it correctly!

As the answer say, I add the socket.close() in the client site in finally block, it fixed the Connection reset problem.

At the same time, I set the Server site MAX_INPUT = 8, that Server can continue to read the input bytes and send it back to the client. But the result is that the client can't receive the complete data:

Server's response is: This is 
Server's response is: This is 
Server's response is: This is Seq.0 request send to server!
Server's response is: This is Seq.3 request send to server!
Server's response is: This is Seq.4 request send to server!

Or sometimes server site throw exception like:

java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at com.simple.server.Server$Handler.run(Server.java:44)
at java.lang.Thread.run(Unknown Source)

The Server site code:

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;


public class Server implements Runnable {
    public final static int port = 8080;
    public final static String host = "127.0.0.1";
    public final static int MAX_INPUT = 1024;

    public void run() {
        try {
            ServerSocket serverSocket = new ServerSocket(port);
            System.out.println("Server begin to listen to port to accept!\n");
            while (!Thread.interrupted()) {
                Socket socket = serverSocket.accept();
                new Thread(new Handler(socket)).start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static class Handler implements Runnable {

        private Socket _socket;

        Handler(Socket socket) {
            _socket = socket;
        } 

        public void run() {
            try {

                InputStream in = _socket.getInputStream();
                OutputStream out = _socket.getOutputStream();

                int read;
                byte[] buf = new byte[MAX_INPUT];
                // I use a loop to continue to read 
                // data from client
                while ((read = in.read(buf)) != -1)
                    out.write(buf, 0, read);

            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    _socket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
     }

    public static void main(String args[]) {
        new Thread(new Server()).start();
    }

}

The client site code:

public class Client implements Runnable {

    public final static String host = "127.0.0.1";
    public final static int port = 8080;
    public final static int MAX_INPUT = 1024;

    private int seq;

    Client(int seq) {
        this.seq = seq;
    }

    public void run() {
        try {

            Socket client = new Socket(host, port);


            OutputStreamWriter writer = new  OutputStreamWriter(client.getOutputStream());
            InputStreamReader reader = new InputStreamReader(client.getInputStream());
            writer.write("This is Seq." + seq + " request send to server!");
            writer.flush();

            char[] buf = new char[MAX_INPUT];
            int len = reader.read(buf);
            String response = new String(buf, 0, len);

             System.out.println("Server's response is: " + response);
         } catch (IOException e) {
             e.printStackTrace();
         }
    }

    public static void main(String args[]) {

        Thread threads[] = {
            new Thread(new Client(0)), 
            new Thread(new Client(1)), 
            new Thread(new Client(2)),
            new Thread(new Client(3)), 
            new Thread(new Client(4))
         };

        for(Thread thread : threads)
            thread.start();
     }
 }

The throw Exception:

java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at com.simple.server.Server$Handler.run(Server.java:44)
at java.lang.Thread.run(Unknown Source)