android socket程式設計例項
轉自:http://blog.csdn.net/wuchuanpingstone/article/details/6617276
Android客戶端通過socket與伺服器進行通訊可以分為以下幾步:
應用程式與伺服器通訊可以採用兩種模式:TCP可靠通訊 和UDP不可靠通訊。
(1)通過IP地址和埠例項化Socket,請求連線伺服器:
socket = new Socket(HOST, PORT); //host:為伺服器的IP地址 port:為伺服器的埠號
(2)獲取Socket流以進行讀寫,並把流包裝進BufferWriter或者PrintWriter:
PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
這裡涉及了三個類:socket.getOutputStream得到socket的輸出位元組流,OutputStreamWriter是位元組流向字元流轉換的橋樑,BufferWriter是字元流,然後再包裝進PrintWriter。
(3)對Socket進行讀寫
if (socket.isConnected()) {
if (!socket.isOutputShutdown()) {
out.println(msg);
}
}
(4)關閉開啟的流
out.close();
在寫程式碼的過程中一定要注意對socket 輸入流 輸出流的關閉
下面是一個簡單的例子:
main.xml
[html] view plain copy print?- <?xmlversion="1.0"encoding="utf-8"?>
- <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
-
android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- <TextView
- android:id="@+id/TextView"
- android:singleLine="false"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"/>
- <EditTextandroid:hint="content"
- android:id="@+id/EditText01"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- </EditText>
- <Button
- android:text="send"
- android:id="@+id/Button02"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- </Button>
- </LinearLayout>
下面是android客戶端的原始碼:
[java] view plain copy print?- package com.android.SocketDemo;
- 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 android.app.Activity;
- import android.app.AlertDialog;
- import android.content.DialogInterface;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.Message;
- import android.view.View;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.TextView;
- publicclass SocketDemo extends Activity implements Runnable {
- private TextView tv_msg = null;
- private EditText ed_msg = null;
- private Button btn_send = null;
- // private Button btn_login = null;
- privatestaticfinal String HOST = "192.168.1.223";
- privatestaticfinalint PORT = 9999;
- private Socket socket = null;
- private BufferedReader in = null;
- private PrintWriter out = null;
- private String content = "";
- /** Called when the activity is first created. */
- @Override
- publicvoid onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- tv_msg = (TextView) findViewById(R.id.TextView);
- ed_msg = (EditText) findViewById(R.id.EditText01);
- // btn_login = (Button) findViewById(R.id.Button01);
- btn_send = (Button) findViewById(R.id.Button02);
- try {
- socket = new Socket(HOST, PORT);
- in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
- out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
- socket.getOutputStream())), true);
- } catch (IOException ex) {
- ex.printStackTrace();
- ShowDialog("login exception" + ex.getMessage());
- }
- btn_send.setOnClickListener(new Button.OnClickListener() {
- @Override
- publicvoid onClick(View v) {
- // TODO Auto-generated method stub
- String msg = ed_msg.getText().toString();
- if (socket.isConnected()) {
- if