客户端TCP和服务端的交互，分别向对方传输数据

客户端发起请求和服务端建立连接以后，客户端写入的数据，服务端可以读取到，服务端写入的数据客户端也可以读取到

java端代码服务端TCPServer.java

package com.ldw.socket.server;

import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

public class TCPServer {

	public static void main(String[] args) {
		int port = 10002;
		try {
			ServerSocket server = new ServerSocket(port);

			while (true) {

				// 获得客户端连接
				// 阻塞式方法
				System.out.println("准备阻塞...");
				final Socket client = server.accept();
				System.out.println("阻塞完成...");
				// 输入流，为了获取客户端发送的数据
				InputStream is = client.getInputStream();

				// 输出流,给客户端写数据
				OutputStream os = client.getOutputStream();

				byte[] buffer = new byte[1024];
				int len = -1;
				System.out.println("准备read...");
				while ((len = is.read(buffer)) != -1) {
					System.out.println("read完成...");

					String text = new String(buffer, 0, len);
					System.out.println(text);
					// 输出数据到客户端
					os.write("收到你的请求".getBytes());

				}
				}
				}).start();

			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

客户端通过Android来实现，布局文件，布局文件有几个按键，来方便触发

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
	
	<Button 
	    android:text="连接"
	    android:layout_width="match_parent"
	    android:layout_height="wrap_content"
		android:onClick="clickConnect"
	    />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="clickMessage"
        android:text="通讯" />

	<Button 
	    android:text="断开连接"
	    android:layout_width="match_parent"
	    android:layout_height="wrap_content"
		android:onClick="clickDisConnect"
	    />

</LinearLayout>

逻辑代码MainActivity.java

package org.ldw.socket.client;

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

import org.ldw.socket.client.request.AuthRequest;
import org.ldw.socket.client.request.Request;
import org.ldw.socket.client.request.TextRequest;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
	private EditText et;
	//private EditText et_auth;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		et = (EditText) findViewById(R.id.et);
		//et_auth = (EditText) findViewById(R.id.et_auth);
	}

	private String dstName = "192.168.1.100";
	private int dstPort = 10001;
	private Socket client;
	
	public void clickConnect(View v) {
		new Thread(new Runnable() {
		@Override
		public void run() {
		
			try {
				// 三次握手
				if (client == null || client.isClosed()) {
					client = new Socket(dstName, dstPort);
				}
			
				InputStream is = client.getInputStream();
				byte[] buffer = new byte[1024];
				int len = -1;
				while ((len = is.read(buffer)) != -1) {
					final String text = new String(buffer, 0, len);
					
					runOnUiThread(new Runnable() {
						public void run() {
							Toast.makeText(getApplicationContext(), text,
							Toast.LENGTH_SHORT).show();
						}
					});
				}
			
			} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
		}
		
		}
		}).start();
	}
	
	public void clickMessage(View v) {
		//获取输入框的内容
		final String content = et.getText().toString().trim();
		if (TextUtils.isEmpty(content)) {
			return;
		}
		// 数据通讯
		OutputStream os;
		try {
		os = client.getOutputStream();
		os.write(content.getBytes());
		} catch (IOException e) {
		e.printStackTrace();
		}

	}
	
	public void clickDisConnect(View v) {
		// 断开连接
		try {
			if (client != null && !client.isClosed()) {
				client.close();
				client = null;
				}
			} catch (IOException e) {
			e.printStackTrace();
		}
	}
}