练习android网络知识。先介绍一下大概流程。首先是建立一个java工程,并创建两个java类,一个用于接收到客户端的连接,并把连接添加list中,第二类实现线程runnable接口,专门用来接收发送客户发送的信息。其次,建立android工程,并创建两个类,一个用于显示聊天界面,另一个负责接收服务器端返回的信息。这个例子肯定会有考虑不周的地方但是只是为了学习android中网络相关api的使用,所以请大家谨慎拍砖。
首先还是android的内容
<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" >
<EditText
android:id="@+id/et_show"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:lines="5"
android:hint="所有聊天信息"
android:gravity="center"
/>
<EditText
android:id="@+id/et_input"
android:layout_below="@+id/et_show"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="输入聊天信息"
android:gravity="center"
/>
<Button
android:id="@+id/bt_send"
android:layout_below="@+id/et_input"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="发送信息"
/>
< /RelativeLayout>
接着是MainAvitvity.java
[java]
public class MainActivity extends Activity {
private EditText et_show,et_input;
private Button bt_send;
private OutputStream os;
private Handler handler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_input = (EditText) this.findViewById(R.id.et_input);
et_show = (EditText) this.findViewById(R.id.et_show);
bt_send = (Button) this.findViewById(R.id.bt_send);
try {
//定义客户连接的socket
Socket socket = new Socket("本机IP",30000);
//启动客户端监听线程
new Thread(new ClinetThread(socket,handler)).start();
os = socket.getOutputStream();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
bt_send.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
//得到输入框中的内容,写入到输入流中
os.write((et_input.getText().toString()+"\r\n").getBytes("utf-8"));
et_input.setText("");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if(msg.what == 1){
//得到服务器返回的信息
et_show.append("\n"+msg.obj.toString());
}
}
};
}
}
第三是客户端的线程类
[java]
public class ClinetThread implements Runnable{
Socket socket = null;
Handler handler = null;
BufferedReader br = null;
public ClinetThread(Socket socket,Handler handler) {
this.socket = socket;
this.handler = handler;
try {
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void run() {
String content = null;
try {
while((content = br.readLine())!=null){
Message msg = new Message();
msg.what = 1;
msg.obj = content;
handler.sendMessage(msg);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
接下来是Java工程中的主类
[java]
public class SimpleServer {
//定义保存所有Socket的ArrayList
public static ArrayList<Socket> socketList = new ArrayList<Socket>();
public static void main(String[] args) {
try {
ServerSocket ss = new ServerSocket(30000);
while (true) {
Socket s = ss.accept();
socketList.add(s);
new Thread(new ServerThead(s)).start();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
其次java工程中的线程类
[java]
public class ServerThead implements Runnable {
//定义当前线程处理的socket
Socket s = null;
//该线程所处理的socket对应的输入流
BufferedReader br = null;
public ServerThead(Socket s) throws IOException {
this.s = s;
br = new BufferedReader(new InputStreamReader(s.getInputStream()));
}
@Override
public void run() {
String conntent = null;
while((conntent=readFromClient())!=null){
//遍历socket中的每一个socket
for(Socket s:SimpleServer.socketList){
try {
OutputStream os = s.getOutputStream();
os.write((conntent+"\n").getBytes("utf-8"));
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
private String readFromClient() {
try {
return br.readLine();
} catch (IOException e) {
e.printStackTrace();
SimpleServer.socketList.remove(s);
}
return null;
}
}