自己动手写简单的web应用服务器（3）—服务器从磁盘文件中读取文本，发送给客户端

服务器：

package serverAndClient;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * 任务目的：当有客户端进入的时候，服务器就会从磁盘文件读取一段文本，
 *              将该文本信息发送给客户端。
 * 准备工作：预先在D盘建立一个txt文件。文件路径：D:\1.txt
 */
public class Server {
    
    private ServerSocket ss;
    /**端口号*/
    private int port = 8081;
    /**利用构造方法，初始化ServerSocket*/
    public Server() {
        try {
            ss = new ServerSocket(port);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    /**服务器启动,等待客户端进去，并产生Socket对象，将该对象交给线程去执行*/
    public void start(){
        while(true){
            try {
                Socket s = ss.accept();//等待客户端进入
                Thread thread = new Thread(new Handler(s));
                thread.run();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    private class Handler implements Runnable {
        private Socket s;
        public Handler(Socket s) {
            this.s = s;
        }

        @Override
        public void run() {
            try {
                File file = new File("D:/1.txt");
                InputStream is = new FileInputStream(file);
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(is, "GBK"));
                OutputStream os = s.getOutputStream();
                PrintWriter writer = new PrintWriter(new OutputStreamWriter(os));
                String str =null;
                while(true){
                    str = reader.readLine();//循环读取文本
                    if(str==null) break;//读取到文件尾部，跳出循环
                    writer.println(str);
                    writer.flush();
                }
                is.close();
                s.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
    public static void main(String[] args) {
        Server s = new Server();
        s.start();
    }

}

客户端：

package serverAndClient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import org.xml.sax.InputSource;
/**客户端程序，接受从服务器发来的消息*/
public class Client {
    private Socket s;
    
    /**客户端程序启动*/
    public void start(){
        try {
            s = new Socket("192.168.1.103", 8081);
            InputStream is = s.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"GBK"));
            String str = null;
            while(true){
                str = reader.readLine();
                if(str==null){
                    break;
                }
                System.out.println(str);
            }
            s.close();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        Client client = new Client();
        client.start();
    }
}