Android设备做服务器端 TCP连接异常
各位大侠好!
本人想将Android设备做为服务器端与PC端进行TCP通信,但客户端程序运行时总是出现如下异常:
S:Error
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:519)
at java.net.Socket.connect(Socket.java:469)
at java.net.Socket.<init>(Socket.java:366)
at java.net.Socket.<init>(Socket.java:180)
at com.client.demo.ClientDemo.main(ClientDemo.java:15)
已关闭防火墙,PC端可以ping通安卓手机的IP,怀疑是代码问题。先将代码贴出来给各位大侠看看,请多多指教!非常感谢!
MainActivity.java
/**
* 服务器端主界面
* @version 1.0
*/
package com.example.serverdemo;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
// 定义界面上的两个文本框
EditText input, show;
// 定义界面上的一个按钮
Button send;
OutputStream os;
private Handler handler;
// 定义保存所有Socket的ArrayList
static ArrayList<Socket> socketList = new ArrayList<Socket>();
@SuppressLint("HandlerLeak")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
input = (EditText) findViewById(R.id.input);
send = (Button) findViewById(R.id.send);
show = (EditText) findViewById(R.id.show);
ServerSocket ss = null;
try {
ss = new ServerSocket(12345);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Socket s;
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// 如果消息来自于子线程
if (msg.what == 0x123) {
// 将读取的内容追加显示在文本框中
show.append("\n" + msg.obj.toString());
}
}
};
try {
// 阻塞,等待连接
Socket s = ss.accept();
socketList.add(s);
// 每当客户端连接后启动一条ServerThread线程为该客户端服务
new Thread(new ServerThread(s, handler)).start();
os = s.getOutputStream();
} catch (Exception e) {
e.printStackTrace();
}
send.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
// 将用户在文本框内输入的内容写入网络
os.write((input.getText().toString() + "\r\n")
.getBytes("utf-8"));
// 清空input文本框
input.setText("");
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
ServerThread.java
/**
* 服务器端线程处理
*/
package com.example.serverdemo;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import android.os.Handler;
import android.os.Message;
public class ServerThread implements Runnable {
// 定义当前线程负责处理的Socket
private Socket s;
private Handler handler;
// 定义该线程所处理的Socket所对应的输入流
BufferedReader br = null;
public ServerThread(Socket s, Handler handler) throws IOException {
this.s = s;
this.handler = handler;
// 初始化该Socket对应的输入流
br = new BufferedReader(new InputStreamReader(s.getInputStream(),
"utf-8"));
}
public void run() {
try {
String content = null;
// 循环不断从Socket中读取客户端发送过来的数据
while ((content = readFromClient()) != null) {
// 遍历socketList中的每个Socket,
// 将读到的内容向每个Socket发送一次
// System.out.println(br.toString());
for (Socket s : MainActivity.socketList) {
OutputStream os = s.getOutputStream();
os.write((content + "\n").getBytes("utf-8"));
}
// 每当读到来自客户端的数据之后,发送消息通知程序界面显示该数据
Message msg = new Message();
msg.what = 0x123;
msg.obj = content;
handler.sendMessage(msg);
}
} catch (Exception e) {
e.printStackTrace();
}
}
// 定义读取客户端数据的方法
private String readFromClient() {
try {
return br.readLine();
}
// 如果捕捉到异常,表明该Socket对应的客户端已经关闭
catch (IOException e) {
// 删除该Socket。
MainActivity.socketList.remove(s); // ①
}
return null;
}
}
PC客户端的代码:
ClientDemo.java
package com.client.demo;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
public class ClientDemo {
public static void main(String[] args) throws UnknownHostException,
IOException {
BufferedReader br = null;
Socket s = null;
try {
s = new Socket("192.168.1.108", 12345);
System.out.println("Connected to server ..... Sending echo String");
// 将Socket对应的输入流包装成BufferedReader
br = new BufferedReader(new InputStreamReader(s.getInputStream()));
// 进行普通IO操作
String line = br.readLine();
System.out.println("Received Message from Server:" + line);
} catch (Exception e) {
System.out.println("S:Error");
e.printStackTrace();
} finally {
try {
if (br != null)
br.close();
if (s != null)
s.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}