JAVA BIO 服务器与客户端实现示例

朴灿烈づ我的快乐病毒、 2022-08-14 02:36 232阅读 0赞

代码只兼容JAVA 7及以上版本。

服务器端代码：

package com.stevex.app.bio;
     
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.ServerSocket;
    import java.net.Socket;
     
    import javax.net.ServerSocketFactory;
     
    public class XiaoNa {
        public static void main(String[] args){
            XiaoNa xiaona = new XiaoNa();
             
            ServerSocket serverSocket = null;
            Socket socket = null;
     
            try {
                //可以设置客户连接请求队列的长度，比如5，队列长度超过5后拒绝连接请求
                //serverSocket = ServerSocketFactory.getDefault().createServerSocket(8383, 5);      
                serverSocket = ServerSocketFactory.getDefault().createServerSocket(8383);
                 
                while(true){
                    try{
                        //监听直到接受连接后返回一个新Socket对象
                        socket = serverSocket.accept();//阻塞
                        //new一个线程处理连接请求
                        new Thread(xiaona.new Worker(socket)).start();;
                    }
                    catch (Throwable e) {    //防止发生异常搞死服务器          
                        e.printStackTrace();
                    }              
                }          
            } catch (IOException e) {              
                e.printStackTrace();
            }
            finally{               
                try {             
                    if(socket != null){
                        socket.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }  
            }
        }
         
        private static String getAnswer(String question){
            String answer = null;
             
            switch(question){
            case "who":
                answer = "我是小娜";
                break;
            case "what":
                answer = "我是来帮你解闷的";
                break;
            case "where":
                answer = "我来自外太空";
                break;
            default:
                    answer = "请输入 who， 或者what， 或者where";
            }
             
            return answer;
        }
         
        private class Worker implements Runnable{
            private Socket socket;
             
            public Worker(Socket socket){
                this.socket = socket;
            }
             
            @Override
            public void run() {
                BufferedReader reader = null;
                PrintWriter writer = null;
                 
                try {
                    reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                 
                    writer = new PrintWriter(socket.getOutputStream());
                     
                    String question = reader.readLine();//没有内容会阻塞
                     
                    while(!question.equals("OVER")){
                        String answer = getAnswer(question);
                        writer.println(answer);
                        question = reader.readLine();
                    }
                     
                    writer.println("OVER");//OVER作为操作完成暗号
                    writer.flush();
                     
                    if(writer != null){
                        writer.close();
                    }
                                         
                    if(reader != null){
                        reader.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
             
        }
    }

客户段代码：

package com.stevex.app.bio;
     
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.Socket;
     
    public class Client {
        public static void main(String[] args) {
            Client c = new Client();
             
            //种20个线程发起Socket客户端连接请求
            for(int i=0; i<20; i++){
                new Thread(c.new Worker()).start();
            }      
        }
         
        private class Worker implements Runnable{
     
            @Override
            public void run() {
                Socket socket = null;
                BufferedReader reader = null;
                PrintWriter writer = null;
     
                try {
                    //创建一个Socket并连接到指定的目标服务器
                    socket = new Socket("localhost", 8383);
     
                    reader = new BufferedReader(new InputStreamReader(
                            socket.getInputStream()));
                    writer = new PrintWriter(socket.getOutputStream());
     
                    writer.println("who");
                    writer.println("what");
                    writer.println("where");
                    writer.println("OVER");//OVER作为操作完成暗号
                    writer.flush();
     
                    String answer = reader.readLine();   //没有内容会阻塞      
                    while(! answer.equals("OVER")){               
                        System.out.println(Thread.currentThread().getId() + "---Message from server:" + answer);
                        answer = reader.readLine();
                    }
     
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    try {
                        if (writer != null) {
                            writer.close();
                        }
     
                        if (reader != null) {
                            reader.close();
                        }
     
                        if (socket != null) {
                            socket.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
             
        }
    }

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