一、环境搭建
1、 所需软件列表
a、 Tomcat
b、Eclipse
c、JDK
2、环境配置
Tomcat配置、JDK安装，注意如果Eclipse中没有安装Tomcat插件(Windows-->Preferences中没有Server、Tomcat这项)，可参考 https://blog.csdn.net/suyimin2010/article/details/80050202安装 Tomcat插件。
二、项目配置
1、服务端
1.1 Eclipse中 File-->new--->Dynamic Web Project 新建一个Web Project
1.2 在Java Resources 下新建一个包和Main类，写入如下代码：
package com.chatfree.server;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class Main {
public static final int PORT = 8888;//监听的端口号
public static void main(String[] args) {
System.out.println("服务器启动...\n");
Main server = new Main();
server.init();
}
public void init() {
try {
ServerSocket serverSocket = new ServerSocket(PORT);
while (true) {
// 一旦有堵塞, 则表示服务器与客户端获得了连接
Socket client = serverSocket.accept();
// 处理这次连接
new HandlerThread(client);
}
} catch (Exception e) {
System.out.println("服务器异常: " + e.getMessage());
}
}
private class HandlerThread implements Runnable {
private Socket socket;
public HandlerThread(Socket client) {
socket = client;
new Thread(this).start();
}
public void run() {
try {
// 读取客户端数据
DataInputStream input = new DataInputStream(socket.getInputStream());
String clientInputStr = input.readUTF();//这里要注意和客户端输出流的写方法对应,否则会抛 EOFException
// 处理客户端数据
System.out.println("客户端发过来的内容:" + clientInputStr);
// 向客户端回复信息
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
System.out.print("请输入:\t");
// 发送键盘输入的一行
String s = new BufferedReader(new InputStreamReader(System.in)).readLine();
out.writeUTF(s);
out.close();
input.close();
} catch (Exception e) {
System.out.println("服务器 run 异常: " + e.getMessage());
} finally {
if (socket != null) {
try {
socket.close();
} catch (Exception e) {
socket = null;
System.out.println("服务端 finally 异常:" + e.getMessage());
}
}
}
}
}
}
1.3 在第一步环境配置中配置好Tomcat后，点击Eclipse中的Tomcat图标，运行Tomcat
1.4 在Main类上右键 Run as-->Java Application 服务即可运行
2、客户端
新建一个Android项目，在MainActivity中写入以下代码，注意修改你的IP的地址：
package com.example.zgp.chatfree;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
public class MainActivity extends ActionBarActivity {
private TextView myTextView;
private Button mBtnConnect;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myTextView = (TextView) findViewById(R.id.tv_info);
mBtnConnect=(Button)findViewById(R.id.btn_connect);
mBtnConnect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Thread(new Runnable() {
@Override
public void run() {
Socket socket = null;
try {
//创建一个流套接字并将其连接到指定主机上的指定端口号
socket = new Socket("192.168.1.91", 8888);
//读取服务器端数据
DataInputStream input = new DataInputStream(socket.getInputStream());
//向服务器端发送数据
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
String str = "I am Client";
out.writeUTF(str);
final String ret = input.readUTF();
runOnUiThread(new Runnable() {
@Override
public void run() {
myTextView.setText(ret);
Toast.makeText(MainActivity.this,ret,Toast.LENGTH_SHORT).show();
}
});
System.out.println("服务器端返回过来的是: " + ret);
out.close();
input.close();
} catch (Exception e) {
System.out.println("客户端异常:" + e.getMessage());
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
socket = null;
System.out.println("客户端 finally 异常:" + e.getMessage());
}
}
}
}
}).start();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
布局文件如下：
<RelativeLayout 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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView
android:id="@+id/tv_info"
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:layout_below="@+id/tv_info"
android:text="Connect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_connect"/>
</RelativeLayout>
运行Android项目，点击上面的Button，Eclipse 服务端控制台即可看到输出，同是在控制台输入字符，即可看到app中文本框中的内容改变。