Android 之 Socket 通信

联系一下 Socket 编程,之后需要将一个 JavaEE 项目移植到 Android,暂时现尝试写一个简单的 DEMO,理解一下 Socket

Server 端编程

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket; /**
* 测试Android客户端与PC服务器通过socket进行交互
* 服务器端:接收客户端的信息并回送给客户
* @author Dream_Kidd
* @since 2015年06月16日11:39:14
*/
public class Server implements Runnable {
public static final int SERVERPORT = 51706;
private ServerSocket serverSocket; public void run() {
try {
System.out.println("S: Connecting..."); serverSocket = new ServerSocket(SERVERPORT);
while (true) {
// 等待接受客户端请求
Socket client = serverSocket.accept(); System.out.println("S: Receiving..."); try {
// 接受客户端信息
BufferedReader in = new BufferedReader(
new InputStreamReader(client.getInputStream())); // 发送给客户端的消息
PrintWriter out = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(client.getOutputStream())),true); System.out.println("S: receive a new message");
String str = in.readLine(); // 读取客户端的信息
System.out.println("S: read message over");
if (str != null ) {
// 设置返回信息,把从客户端接收的信息再返回给客户端
out.println("You sent to server message is:" + str);
out.flush();
System.out.println("S: Received: '" + str + "'");
} else {
System.out.println("Not receiver anything from client!");
}
} catch (Exception e) {
System.out.println("S: Error 1"+e.getMessage());
e.printStackTrace();
} finally {
client.close();
System.out.println("S: Done.");
}
}
} catch (Exception e) {
System.out.println("S: Error 2"+e.getMessage());
e.printStackTrace();
}
} public static void main(String [] args ) {
Thread desktopServerThread = new Thread(new Server());
desktopServerThread.start();
}
}

在此处基本没什么问题,直接运行即可等待客户端连接

Client编程

1.修改manifest,在里面加上''

2.编写 Client 代码

package com.example.dream_kidd.testsocket;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
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;
import java.net.UnknownHostException; public class MainActivity extends Activity { private Socket socket;
private Button bt;
private TextView tx;
private EditText et; private static final String host = "192.168.50.73";
private static final int port = 51706; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt= (Button) findViewById(R.id.but1);
tx= (TextView) findViewById(R.id.tx1);
et= (EditText) findViewById(R.id.et); bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setTitle("Test Socket");
try {
socket = new Socket(host, port);
Log.d("TCP","Client...Connecting");
PrintWriter out = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream())),
true); //接受服务器信息
BufferedReader in = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
//得到服务器信息
String msg = in.readLine();
//在页面上进行显示
tx.setText(msg);
out.println(msg);
out.flush();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
} }

3.直接在 IDE 中托拉拽,生成的布局xml

<AbsoluteLayout 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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:orientation="vertical"> <TextView
android:id="@+id/tx1"
android:layout_width="match_parent"
android:layout_height="89dp"
android:layout_x="2dp"
android:layout_y="87dp"
android:text=" receive:" /> <Button
android:id="@+id/but1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="sendmsg"
android:layout_x="277dp"
android:layout_y="11dp" /> <EditText
android:id="@+id/et"
android:layout_width="253dp"
android:layout_height="wrap_content"
android:text="请输入信息" /> </AbsoluteLayout>

然后兴冲冲的运行,结果……悲剧了

报错了,NetworkOnMainThreadException,google一下,发现这个是在安卓2.3之后,google 不允许在主线程中访问网络,

那就起一个线程,修改后代码如下

## Android 之 Socket 通信
联系一下 Socket 编程,之后需要将一个 JavaEE 项目移植到 Android,暂时现尝试写一个简单的 DEMO,理解一下 Socket
### Server 端编程

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

/**

  • 测试Android客户端与PC服务器通过socket进行交互

  • 服务器端:接收客户端的信息并回送给客户

  • @author Dream_Kidd

  • @since 2015年06月16日11:39:14

    */

    public class Server implements Runnable {

    public static final int SERVERPORT = 51706;

    private ServerSocket serverSocket;

    public void run() {

    try {

    System.out.println("S: Connecting...");

     	serverSocket = new ServerSocket(SERVERPORT);
    while (true) {
    // 等待接受客户端请求
    Socket client = serverSocket.accept(); System.out.println("S: Receiving..."); try {
    // 接受客户端信息
    BufferedReader in = new BufferedReader(
    new InputStreamReader(client.getInputStream())); // 发送给客户端的消息
    PrintWriter out = new PrintWriter(new BufferedWriter(
    new OutputStreamWriter(client.getOutputStream())),true); System.out.println("S: receive a new message");
    String str = in.readLine(); // 读取客户端的信息
    System.out.println("S: read message over");
    if (str != null ) {
    // 设置返回信息,把从客户端接收的信息再返回给客户端
    out.println("You sent to server message is:" + str);
    out.flush();
    System.out.println("S: Received: '" + str + "'");
    } else {
    System.out.println("Not receiver anything from client!");
    }
    } catch (Exception e) {
    System.out.println("S: Error 1"+e.getMessage());
    e.printStackTrace();
    } finally {
    client.close();
    System.out.println("S: Done.");
    }
    }
    } catch (Exception e) {
    System.out.println("S: Error 2"+e.getMessage());
    e.printStackTrace();
    }

    }

    public static void main(String [] args ) {

    Thread desktopServerThread = new Thread(new Server());

    desktopServerThread.start();

    }

    }


在此处基本没什么问题,直接运行即可等待客户端连接
### Client编程 1.修改manifest,在里面加上'<uses-permission android:name="android.permission.INTERNET"/>'
2.编写 Client 代码

package com.example.dream_kidd.testsocket;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

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;

import java.net.UnknownHostException;

public class MainActivity extends Activity {

private Socket socket;
private Button bt;
private TextView tx;
private EditText et; private static final String host = "192.168.50.73";
private static final int port = 51706; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt= (Button) findViewById(R.id.but1);
tx= (TextView) findViewById(R.id.tx1);
et= (EditText) findViewById(R.id.et); bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setTitle("Test Socket");
try {
socket = new Socket(host, port);
Log.d("TCP","Client...Connecting");
PrintWriter out = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream())),
true); //接受服务器信息
BufferedReader in = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
//得到服务器信息
String msg = in.readLine();
//在页面上进行显示
tx.setText(msg);
out.println(msg);
out.flush();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
}

}

3.直接在 IDE 中托拉拽,生成的布局xml
<TextView
android:id="@+id/tx1"
android:layout_width="match_parent"
android:layout_height="89dp"
android:layout_x="2dp"
android:layout_y="87dp"
android:text=" receive:" /> <Button
android:id="@+id/but1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="sendmsg"
android:layout_x="277dp"
android:layout_y="11dp" /> <EditText
android:id="@+id/et"
android:layout_width="253dp"
android:layout_height="wrap_content"
android:text="请输入信息" />

```
然后兴冲冲的运行,结果……悲剧了
报错了,`NetworkOnMainThreadException`,google一下,发现这个是在安卓2.3之后,google 不允许在主线程中访问网络,
那就起一个线程,修改后代码如下

package com.example.dream_kidd.testsocket;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
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;
import java.net.UnknownHostException; public class MainActivity extends Activity { private Socket socket;
private Button bt;
private TextView tx;
private EditText et; private static final String host = "192.168.50.73";
private static final int port = 51706; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt= (Button) findViewById(R.id.but1);
tx= (TextView) findViewById(R.id.tx1);
et= (EditText) findViewById(R.id.et); final Thread t = new Thread(new Runnable() {
@Override
public void run() {
try { socket = new Socket(host, port);
Log.d("TCP","Client...Connecting");
PrintWriter out = new PrintWriter(new BufferedWriter(
new OutputStreamWriter(socket.getOutputStream())),
true); //接受服务器信息
BufferedReader in = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
//得到服务器信息
String msg = in.readLine();
//在页面上进行显示
tx.setText(msg);
out.println(msg);
out.flush();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}); bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setTitle("Test Socket");
t.start();
}
});
} }

这样即可与 Service 建立连接了,但是问题很多,也仅仅只能建立连接而已,需要修改

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