socket未接收任何内容的java BufferedReader
我正在尝试为我的电脑做一个遥控器，在我的电脑上使用安卓应用程序和java程序。 我在端口8000上使用了一个socket，它连接起来没有问题，但是当我阅读安卓手机发送的信息时，它什么都不做。代码如下： pc/Main。爪哇
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.*;
import static java.lang.Thread.sleep;
public class Main {
private static String SERVER_IP;
private static final int SERVER_PORT = 8000;
private static HashSet<String> addr = new HashSet<>(Collections.emptySet());
public static void main(String[] args) {
if (args[0].equals("fast")) {
addr.add("192.168.1.13");
} else {
for (int i = 1; i < 256; i++) {
System.out.print(((i % 4) == 0 ? (i / 4 % 5 == 0 ? i / 4 + "%\n" : "") : ""));
SERVER_IP = "192.168.1." + i;
Socket socket = new Socket();
boolean b = false;
try {
socket.connect(new InetSocketAddress(SERVER_IP, SERVER_PORT), 200);
socket.close();
if (!SERVER_IP.equals("192.168.1.100")) addr.add(SERVER_IP);
b = true;
} catch (IOException ignored) {
}
if (b) {
System.out.println("\u001B[32m" + SERVER_IP + " is on the network !" + "\u001B[0m");
}
}
}
new Thread(new Init()).start();
}
private static BufferedReader input;
static class Init implements Runnable {
Socket socket;
@Override
public void run() {
addr.forEach(addr -> {
try {
socket = new Socket(addr, SERVER_PORT);
input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
System.out.println("connected hehe to " + addr);
new Thread(new MessageReader()).start();
} catch (IOException e) {
e.printStackTrace();
}
});
}
}
static class MessageReader implements Runnable {
@Override
public void run() {
while (true) {
System.out.println("aaaa");
try {
String msg;
System.out.println(msg = input.readLine());
System.out.println("ive read the line yeet");
if (msg != null) {
System.out.println(msg);
} else {
new Thread(new Init()).start();
return;
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
安卓/Main。爪哇
package net.uku3lig.gameapi;
import 安卓.net.wifi.WifiManager;
import 安卓.os.Bundle;
import 安卓.view.View;
import 安卓.widget.Button;
import 安卓.widget.TextView;
import 安卓x.appcompat.app.AppCompatActivity;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.*;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
public class Main extends AppCompatActivity {
public static String ip = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = findViewById(R.id.button);
TextView t = findViewById(R.id.textView);
//get ip
WifiManager wm = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
assert wm != null;
try {
ip = InetAddress.getByAddress(ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN)
.putInt(wm.getConnectionInfo().getIpAddress()).array()).getHostAddress();
} catch (UnknownHostException e) { e.printStackTrace(); }
assert ip != null;
t.setText(ip);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Thread(new Sender(Arrays.asList("ah","shit","here","we","go","again").get((int) Math.round(Math.random()*5)))).start();
}
});
}
private PrintWriter output;
class Sender implements Runnable {
private String msg;
Sender(String msg) {
this.msg = msg;
}
@Override
public void run() {
Socket socket;
ServerSocket ss;
try {
ss = new ServerSocket(8000);
ss.setReuseAddress(true);
socket = ss.accept();
output = new PrintWriter(socket.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
output.write("yeet");
output.flush();
}
}
}
安卓/main。xml（应用程序布局）
<?xml version="1.0" encoding="utf-8"?>
<安卓x.constraintlayout.widget.ConstraintLayout
xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:tools="http://schemas.安卓.com/tools"
xmlns:app="http://schemas.安卓.com/apk/res-auto"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent"
tools:context=".Main">
<Button
安卓:text="lick me"
安卓:layout_width="wrap_content"
安卓:layout_height="wrap_content"
安卓:id="@+id/button"
app:layout_constraintBottom_toBottomOf="parent"
安卓:layout_marginBottom="340dp" app:layout_constraintStart_toStartOf="parent"
安卓:layout_marginLeft="160dp" 安卓:layout_marginStart="160dp"
/>
<Button
安卓:text="Button"
安卓:layout_width="wrap_content"
安卓:layout_height="wrap_content"
安卓:id="@+id/button2"
app:layout_constraintBottom_toBottomOf="parent" 安卓:layout_marginBottom="388dp"
app:layout_constraintStart_toStartOf="parent" 安卓:layout_marginLeft="160dp"
安卓:layout_marginStart="160dp"/>
<TextView
安卓:text="TextView"
安卓:layout_width="wrap_content"
安卓:layout_height="wrap_content"
安卓:id="@+id/textView" 安卓:layout_marginBottom="24dp"
app:layout_constraintBottom_toTopOf="@+id/button2" app:layout_constraintStart_toStartOf="parent"
安卓:layout_marginLeft="175dp" 安卓:layout_marginStart="175dp"/>
</安卓x.constraintlayout.widget.ConstraintLayout>
安卓/AndroidManifest。xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
package="net.uku3lig.gameapi">
<uses-permission 安卓:name="安卓.permission.ACCESS_WIFI_STATE"/>
<uses-permission 安卓:name="安卓.permission.INTERNET"/>
<application
安卓:allowBackup="true"
安卓:icon="@mipmap/ic_launcher"
安卓:label="@string/app_name"
安卓:roundIcon="@mipmap/ic_launcher_round"
安卓:supportsRtl="true"
安卓:theme="@style/AppTheme">
<activity 安卓:name=".Main">
<intent-filter>
<action 安卓:name="安卓.intent.action.MAIN" />
<category 安卓:name="安卓.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
基于：https://www.tutorialspoint.com/how-to-send-data-through-wifi-in-安卓-programmatically 希望你能帮助我，Uku3lig
PS：执行软件的部分缺失，这是正常的，我现在只关注数据发送部分
# 1 楼答案
改变
到
这应该行得通。问题是BufferedReader。readLine（）在等待换行符时被阻止