实现链接数据库端的朋友信息展示以及Socket通信学习
链接数据库的朋友信息并展示
package com.example.newbsh.UI.friends;
import androidx.lifecycle.ViewModelProviders;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;
import com.example.newbsh.HttpUtil.HttpUtil;
import com.example.newbsh.MainActivity;
import com.example.newbsh.R;
import com.example.newbsh.UI.friends.list.SideBar;
import com.example.newbsh.UI.friends.list.SortAdapter;
import com.example.newbsh.UI.friends.list.User;
import org.json.JSONArray;
import org.json.JSONException;
import java.util.ArrayList;
import java.util.Collections;
public class FriendFragment extends Fragment {
private FriendViewModel mViewModel;
private View view;
private ListView listView;
private SideBar sideBar;
private ArrayList<User> list;
private Handler handler;
private String getUsername(){
return MainActivity.getUserName();
}
public static FriendFragment newInstance() {
return new FriendFragment();
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
view=inflater.inflate(R.layout.friend_fragment, container, false);
return view;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mViewModel = ViewModelProviders.of(this).get(FriendViewModel.class);
// TODO: Use the ViewModel
initView();
getThreadData();
handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(@NonNull Message msg) { //线程回调更新数据
if (msg.what == 200)
{
list=new ArrayList<>();
JSONArray jsonArray=(JSONArray)msg.obj;
for(int i=0;i<jsonArray.length();i++)
{
try {
String friendname= (String) jsonArray.getJSONObject(i).get("friendname");
String friendurl= (String) jsonArray.getJSONObject(i).get("friendurl");
User bean=new User(friendname,friendurl);
list.add(bean);
} catch (JSONException e) {
e.printStackTrace();
}
}
Collections.sort(list); // 对list进行排序，需要让User实现Comparable接口重写compareTo方法
SortAdapter adapter = new SortAdapter(view.getContext(), list);
listView.setAdapter(adapter);
}
return true;
}
});
}
private void initView() {
listView = (ListView) view.findViewById(R.id.listView);
sideBar = (SideBar) view.findViewById(R.id.side_bar);
sideBar.setOnStrSelectCallBack(new SideBar.ISideBarSelectCallBack() {
@Override
public void onSelectStr(int index, String selectStr) {
for (int i = 0; i < list.size(); i++) {
if (selectStr.equalsIgnoreCase(list.get(i).getFirstLetter())) {
listView.setSelection(i); // 选择到首字母出现的位置
return;
}
}
}
});
}
private void getThreadData() { //线程封装网络请求
new Thread(new Runnable() {
@Override
public void run() {
String reqdata = "";
String address="http://39.97.181.86/BaiXiaoSheng/myfriend?username="+getUsername();
try {
final JSONArray json = new JSONArray(String.valueOf(HttpUtil.sendPost(address, reqdata)));
Log.d("tag", json.toString());
Message msg = new Message();
msg.what = 200;
msg.obj = json;
handler.sendMessage(msg);
} catch (JSONException e) {
e.printStackTrace();
}
}
}).start();
}
}
Socket通信与本地服务器端链接
服务器端：
package servlet;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.security.Provider;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class Server {
private static final int PORT=12345;
private List<Socket> mlist=new ArrayList<>();
private ServerSocket server=null;
private ExecutorService myExecutorService=null;
public static void main(String[] args){
new Server();
}
public Server()
{
try {
server=new ServerSocket(PORT);
//创建线程池
myExecutorService=Executors.newCachedThreadPool();
System.out.println("服务端运行中...\n");
Socket client=null;
while(true)
{
client=server.accept();
mlist.add(client);
myExecutorService.execute(new Service(client));
}
}catch (Exception e){
e.printStackTrace();
}
}
class Service implements Runnable
{
private Socket socket;
private BufferedReader in = null;
private String msg = "";
public Service(Socket socket) {
this.socket = socket;
try
{
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
msg = "用户:" +this.socket.getInetAddress() + "~加入了聊天室"
+"当前在线人数:" +mlist.size();
this.sendmsg();
}catch(IOException e){e.printStackTrace();}
}
@Override
public void run() {
try{
while (true)
{
if((msg=in.readLine())!=null)
{
if(msg.equals("bye"))
{
System.out.println("~~~~~~~~~~~");
mlist.remove(socket);
in.close();
msg = "用户:" + socket.getInetAddress()
+ "退出:" +"当前在线人数:"+mlist.size();
socket.close();
this.sendmsg();
break;
}
else
{
msg=socket.getInetAddress()+" 说："+msg;
this.sendmsg();
}
}
}
}catch (Exception e){
e.printStackTrace();
}
}
//为连接上服务端的每个客户端发送信息
public void sendmsg()
{
System.out.println(msg);
int num = mlist.size();
for(int index = 0;index < num;index++)
{
Socket mSocket = mlist.get(index);
PrintWriter pout = null;
try {
pout = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(mSocket.getOutputStream(),"UTF-8")),true);
pout.println(msg);
}catch (IOException e) {e.printStackTrace();}
}
}
}
}
安卓端：
package com.example.sockettest;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.StrictMode;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
public class SocketActivity extends AppCompatActivity implements Runnable {
//定义相关变量,完成初始化
private TextView txtshow;
private EditText editsend;
private Button btnsend;
private static final String HOST = "192.168.137.1";
private static final int PORT = 12345;
private Socket socket = null;
private BufferedReader in = null;
private PrintWriter out = null;
private String content = "";
private StringBuilder sb = null;
//定义一个handler对象,用来刷新界面
public Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 0x123) {
sb.append(content);
txtshow.setText(sb.toString());
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_socket);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
sb = new StringBuilder();
txtshow = (TextView) findViewById(R.id.txtshow);
editsend = (EditText) findViewById(R.id.editsend);
btnsend = (Button) findViewById(R.id.btnsend1);
//当程序一开始运行的时候就实例化Socket对象,与服务端进行连接,获取输入输出流
//因为4.0以后不能再主线程中进行网络操作,所以需要另外开辟一个线程
new Thread() {
public void run() {
try {
socket = new Socket(HOST, PORT);
in = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
socket.getOutputStream())), true);
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
new Thread(new Runnable() {
@Override
public void run() {
btnsend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String msg = editsend.getText().toString();
if (socket.isConnected()) {
if (!socket.isOutputShutdown()) {
out.println(msg);
}
}
}
});
}
}).start();
//为发送按钮设置点击事件
new Thread(SocketActivity.this).start();
}
//重写run方法,在该方法中输入流的读取
@Override
public void run() {
try {
while (true) {
if (socket.isConnected()) {
if (!socket.isInputShutdown()) {
if ((content = in.readLine()) != null) {
content += "\n";
handler.sendEmptyMessage(0x123);
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
