Android socket如何实现文件列表动态访问

为了防止代码量上升可能带来的结构杂乱，我们对服务端架构进行优化，server包负责socket服务基础实现，data包负责处理各种安卓端的命令。

将readSocketMsg，writeBackMsg方法单独拿出，创建一个SocketMsg方法类，专门负责数据流的读取与写入。

SocketMsg.java

package lrz.server;import java.io.*;import java.net.Socket;import java.util.ArrayList;public class SocketMsg { public static ArrayList<String> readSocketMsg(Socket socket) throws IOException {ArrayList<String> msgList=new ArrayList<String>();InputStream inputStream = socket.getInputStream();InputStreamReader reader = new InputStreamReader(inputStream, 'utf-8');BufferedReader bufferedReader=new BufferedReader(reader);String lineNumStr = bufferedReader.readLine();int lineNum=Integer.parseInt(lineNumStr);for(int i=0;i<lineNum;i++){ String str = bufferedReader.readLine(); msgList.add(str);}//读取结束后，输入流不能关闭，此时关闭，会将socket关闭，从而导致后续对socket写操作无法实现return msgList; } public static void writeBackMsg(Socket socket, ArrayList<String> msgBackList) throws IOException {BufferedOutputStream os = new BufferedOutputStream(socket.getOutputStream());OutputStreamWriter writer=new OutputStreamWriter(os,'UTF-8');writer.write(''+msgBackList.size()+'n'); //未真正写入的输出流，仅仅在内存中writer.flush(); //写入输出流，真正将数据传输出去for(int i=0;i<msgBackList.size();i++){ writer.write(msgBackList.get(i)+'n'); writer.flush();} }}

创建NetFileData.java作为文件夹访问的方法类，将exeDir（）方法放入其中。

NetFileData.java

package lrz.data;import java.io.File;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;public class NetFileData { public static ArrayList<String> exeDir(String cmdBody) throws Exception {// TODO Auto-generated method stubArrayList<String> backList=new ArrayList<String>();File file = new File(cmdBody);File[] listFiles = file.listFiles();for(File mfile:listFiles){ String fileName = mfile.getName(); long lastModified = mfile.lastModified();//获取文件修改时间 SimpleDateFormat dateFormat = new SimpleDateFormat('yyyy-MM-dd HH:mm:ss');//给时间格式，例如：2018-03-16 09:50:23 String fileDate = dateFormat.format(new Date(lastModified));//取得文件最后修改时间，并按格式转为字符串 String fileSize='0'; String isDir='1'; if(!mfile.isDirectory()){//判断是否为目录isDir='0';fileSize=''+mfile.length(); } backList.add(fileName+'>'+fileDate+'>'+fileSize+'>'+isDir+'>');}return backList; }}

ServerSocket01.java主函数则将以上方法移除，改为调用

package lrz.server;import lrz.data.NetFileData;import java.io.*;import java.net.InetAddress;import java.net.NetworkInterface;import java.net.ServerSocket;import java.net.Socket;import java.util.ArrayList;import java.util.Enumeration;public class ServerSocket01 { int port = 8019;// 自定义一个端口，端口号尽可能挑选一些不被其他服务占用的端口，祥见http://blog.csdn.net/hsj521li/article/details/7678880 static int connect_count = 0;// 连接次数统计 ArrayList<String> msgBackList; public ServerSocket01() {// TODO Auto-generated constructor stub } public ServerSocket01(int port) {super();this.port = port; } private void printLocalIp(ServerSocket serverSocket) {// 枚举打印服务端的IPtry { System.out.println('服务端命令端口prot=' + serverSocket.getLocalPort()); Enumeration<NetworkInterface> interfaces = null; interfaces = NetworkInterface.getNetworkInterfaces(); while (interfaces.hasMoreElements()) {NetworkInterface ni = interfaces.nextElement();Enumeration<InetAddress> addresss = ni.getInetAddresses();while (addresss.hasMoreElements()) { InetAddress nextElement = addresss.nextElement(); String hostAddress = nextElement.getHostAddress(); System.out.println('本机IP地址为：' + hostAddress);} }} catch (Exception e) { e.printStackTrace();} } public void work() throws IOException {// 注意：由于Socket的工作是阻塞式，Android端Socket的工作必须在新的线程中实现，若在UI主线程中工作会报错ServerSocket serverSocket = new ServerSocket(port);printLocalIp(serverSocket);while (true) {// 无限循环，使之能结束当前socket服务后，准备下一次socket服务 System.out.println('Waiting client to connect.....'); Socket socket = serverSocket.accept();// 阻塞式，直到有客户端连接进来，才会继续往下执行，否则一直停留在此代码 System.out.println('Client connected from: ' + socket.getRemoteSocketAddress().toString()); ArrayList<String> cmdList= SocketMsg.readSocketMsg(socket); cmdList.forEach(s -> System.out.println(s)); String cmdbody=cmdList.get(0); try {msgBackList= NetFileData.exeDir(cmdbody); } catch (Exception e) {e.printStackTrace(); } msgBackList.forEach(s -> System.out.println(s)); SocketMsg.writeBackMsg(socket,msgBackList); socket.close(); System.out.println('当前Socket服务结束');} } /** * @param args */ public static void main(String[] args) {// TODO Auto-generated method stubtry { new ServerSocket01().work();} catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace();} }}安卓端更新

使用listview显示文件夹内容，并且实现动态访问。

MainActivity.java更新了简单的listview显示，设立互动事件，在点击某个列表部分时向服务端发动指定命令，返回结果后更新列表，实现互动效果。

package com.example.android_app;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import androidx.annotation.NonNull;import android.os.Build;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;public class MainActivity extends AppCompatActivity { public static final String KEY_SERVER_ACK_MSG = 'KEY_SERVER_ACK_MSG'; private Handler handler = null; EditText url,way,dir; ListView lv; Button submit; SocketClient socketClient=null; String here; ArrayList<String> data; int port; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);url=findViewById(R.id.url);way=findViewById(R.id.way);dir=findViewById(R.id.dir);lv=findViewById(R.id.listview);submit=findViewById(R.id.submit);handler=new Handler(new Handler.Callback() { @Override public boolean handleMessage(@NonNull Message msg) {Bundle data_bundle = msg.getData();data=data_bundle.getStringArrayList(KEY_SERVER_ACK_MSG);data=dataMaker();printAdapter(data);return false; }});submit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) {port=Integer.parseInt(way.getText().toString());here=dir.getText().toString();getdata(); }});lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) {here=here+'/'+data.get(position);getdata(); }}); } private void getdata() {socketClient=new SocketClient(url.getText().toString(),port,handler);socketClient.work(here); } private ArrayList<String> dataMaker() {ArrayList<String> dataResult=new ArrayList<>();int i=data.size();for (int j = 0; j <i ; j++) { String str=data.get(j); str=str.substring(0,str.indexOf('>')); dataResult.add(str);}return dataResult; } private void printAdapter(ArrayList<String> data) {ArrayAdapter<String> arrayAdapter=new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,data);lv.setAdapter(arrayAdapter); }}

SocketClient.java无变动

activity_main.xml布局添加listview，代替原先的textview

<?xml version='1.0' encoding='utf-8'?><LinearLayout xmlns:android='http://schemas.android.com/apk/res/android' xmlns:app='http://schemas.android.com/apk/res-auto' android:orientation='vertical' android:layout_width='match_parent' android:layout_height='match_parent'> <LinearLayoutandroid:layout_width='match_parent'android:layout_height='wrap_content'android:orientation='horizontal'><EditText android:layout_width='0dp' android:layout_height='wrap_content' android:layout_weight='3' android: android:text='服务端ip'/><EditText android:layout_width='0dp' android:layout_height='wrap_content' android:layout_weight='3' android: android:text='8019'/> </LinearLayout> <EditTextandroid:layout_width='match_parent'android:layout_height='wrap_content'android: android:text='d://'/> <Buttonandroid:layout_width='match_parent'android:layout_height='wrap_content'android:text='submit'android: /> <ListViewandroid:layout_width='match_parent'android:layout_height='wrap_content'android: /></LinearLayout>

补充一点：

安卓端访问的ip在服务端中查看，ip为服务端网络ip，我是红色圈中的，可以都试一下，一般都是倒数第二个长得像ip的这个，port在服务端主函数中设置，可以是任何数，8019为常用端

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