as3 與java 都提供了Socket類用於網絡通信, 但兩者的使用也有較大的不同. 爲了方便兩者的通信, 我在做了一些實驗的基礎上, 寫下獲得的經驗,以免忘記.
as3 的socket 讀寫數據方法常用的有四個: readUTF, writeUTF, readUTFBytes, writeUTFBytesjava 的socket 輸入輸出流常用BufferedReader 和 DataOutputStream 包裝, 以提高讀寫效率
如:
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
DataOutputStream writer = new DataOutputStream(socket.getOutputStream());
as3 方寫數據時用writeUTFBytes 方法, 此時java 方讀數據用reader.readLine() 阻塞式方法.
as3 方寫數據時用writeUTF方法, 此時java 方應改用DataInputStream 類包裝輸入流, 因爲BufferedReader 不提供讀取UTF數據的方法.
java 方寫數據時用writeUTF方法, 此時as3 方讀數據用readUTF方法, 但此種模式有個弊端, 就是如果java方連續調用了n(n >= 2)次writeUTF方法,而as3方因來不及讀取, 則最後只是第一次寫入的數據被讀取.
java 方寫數據時用writeBytes, 此時as3 方讀數據用readUTFBytes方法讀取數據, 可以這樣讀取: msg = socket.readUTFBytes(socket.bytesAvailable).
一個簡單的例子:
// as3 寫的客戶端
package test
{
import flash.display.MovieClip;
import flash.net.Socket;
import flash.events.ProgressEvent;
import flash.events.IOErrorEvent;
public class TestSocket extends MovieClip
{
private var socket:Socket;
private var msg:String;
public function TestSocket() {
init();
}
private function init() {
socket = new Socket("localhost", 60000);
socket.addEventListener(ProgressEvent.SOCKET_DATA, readMsg);
socket.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
}
private function readMsg(e:ProgressEvent) {
msg = socket.readUTF();
trace("message:" + msg);
}
private function errorHandler(e:IOErrorEvent) {
trace(e.toString);
}
}
}
//java 寫的服務器端
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class TestSocket {
private ServerSocket socketServer;
private Socket client;
private DataOutputStream writer;
private BufferedReader reader;
public static void main(String[] args) {
int socketPort = 60000;
TestSocket test1 = new TestSocket(socketPort);
}
public TestSocket(int socketPort) {
try {
socketServer = new ServerSocket(socketPort);
System.out.println("server is setted up");
while (true) {
client = socketServer.accept();
//wrap input and output stream
writer = new DataOutputStream(client.getOutputStream());
reader = new BufferedReader(newInputStreamReader(client.getInputStream()));
//send message to client
writer.writeUTF("hello client");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}