Java学习笔记--网络联机----使用Socket读取数据，写入数据

• 使用BufferReader从Socke上读取数据
  步骤：
  ①建立对服务器的Socket的连接，注意这里的127.0.0.1指的是本机，4242是指端口

Socket s = new Socket("127.0.0.1", 4242);

②建立连接到Socket的低层输入串流的InputStreamReader

InputStreamReader streamread = new InputStreamReader(s.getInputStream());

③建立BufferedReader来读取

BufferedReader read = new BufferedReader(streamread);
String advice = read.readLine();

查看代码：

void go() {
		try {
			Socket s = new Socket("127.0.0.1", 4242);
			InputStreamReader streamread = new InputStreamReader(s.getInputStream());
			BufferedReader read = new BufferedReader(streamread);
			String advice = read.readLine();
			System.out.println(advice);
			read.close();
		}catch(Exception ex) {
			ex.printStackTrace();
		}
	}

• 编写简单的服务器程序
  ①服务器应用程序对特定的端口创建ServerSocket
  ②服务器创建出与客户端连接的新版本的Socket

• 简单的客户端程序：

package Java;

import java.io.BufferedReader;

import java.io.InputStreamReader;
import java.net.Socket;

public class DailyAdviceClient {
	void go() {
		try {
			Socket s = new Socket("127.0.0.1", 4242);
			InputStreamReader streamread = new InputStreamReader(s.getInputStream());
			BufferedReader read = new BufferedReader(streamread);
			String advice = read.readLine();
			System.out.println(advice);
			read.close();
		}catch(Exception ex) {
			ex.printStackTrace();
		}
	}
	
	public static void main(String[] agrs) {
		DailyAdviceClient dailyadviceclient = new DailyAdviceClient();
		dailyadviceclient.go();
	}

}

• 简单的服务器端程序：

package Java;

import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class DailyAdviceServer {
	String[] adviceList = {"a","b","c","d"};
	void go() {
		try {
			ServerSocket serversocket = new ServerSocket(4242);
			while(true) {
				//Socket socket = new Socket("127.0.0.1",4242);
				Socket socket = serversocket.accept();
				PrintWriter printwriter = new PrintWriter(socket.getOutputStream());
				String advice = getAdvice();
				printwriter.print(advice);
				printwriter.close();
				System.out.println(advice);
			}
			
		} catch(Exception ex) {
			ex.printStackTrace();
		}
	}
	String getAdvice() {
		int random = (int)(Math.random()*5);
		return adviceList[random];
		
	}
	public static void main(String[] agrs) {
		DailyAdviceServer server = new DailyAdviceServer();
		server.go();
	}
}