java 【socket 连接】 【读取本地文件】 |
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使用Java的Socket实现客户端和服务器端之间的连接，实现客户端重复发送数据到服务器端的功能。即，用户可以在控制台不断输入内容，并将内容逐一发送给服务端。并在服务端显示。 使用到的知识：Socket, Input/OutputStream, Scanner, try...catch, Class，serverSocket 客户端 package TCPUDP; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.Socket; import java.util.Scanner; public class Client { private Socket socket; public Client(){ try { socket = new Socket("localhost", 8088); } catch (Exception e) { e.printStackTrace(); } } public void start(){ try{ OutputStream out = socket.getOutputStream(); //OutputStreamWriter osw = new OutputStreamWriter(out, true); OutputStreamWriter osw = new OutputStreamWriter(out, "UTF-8"); PrintWriter pw = new PrintWriter(osw, true); //pw.println("你好！服务器！"); //创建Scanner读取用户输入内容 Scanner scanner = new Scanner(System.in); while(true){ //scan.nextLine(); pw.println(scanner.nextLine()); } }catch(Exception e){ e.printStackTrace(); }finally{ if(socket != null){ try{ socket.close(); }catch(Exception e){ e.printStackTrace(); } } } } public static void main(String[] args) { // TODO Auto-generated method stub Client client = new Client(); client.start(); } }服务端 package TCPUDP; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.ServerSocket; import java.net.Socket; public class Server { private ServerSocket serverSocket; public Server(){ try{ serverSocket = new ServerSocket(8088); }catch(Exception e){ e.printStackTrace(); } } public void start(){ try{ System.out.println("等待客户端连接。。。"); //方法会产生阻塞，直到某个Socket连接，返回请求连接的Socket Socket socket = serverSocket.accept(); System.out.println("客户端已连接！"); InputStream in = socket.getInputStream(); InputStreamReader isr = new InputStreamReader(in, "UTF-8"); BufferedReader br = new BufferedReader(isr); //System.out.println("客户端说：" + br.readLine()); //不断读取客户端数据 while(true){ System.out.println("客户端说：" + br.readLine()); } }catch(Exception e){ e.printStackTrace(); } } public static void main(String[] args) { // TODO Auto-generated method stub Server server = new Server(); server.start(); } }https://blog.csdn.net/m0_37355722/article/details/79604340 要实现数据传输,首先要建立一个Socket对象,它需要两个参数,要连接的服务器地址和端口.然后获取Socket的输入输出流对象,直接对它们进行读写操作即可.值得注意的是要等用户结束写之后才能关闭Socket,所以需要等待WriteThread结束才进行后续操作.而且很显然发送消息和接受消息是不同步的,因此要用到多线程. IO流使用到的知识：IO、异常 http://baijiahao.baidu.com/s?id=1600804371267182499&wfr=spider&for=pc package hello; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; public class Test { public static void main(String[] args) { File file = new File("C:/Users/admin/Desktop/hi.txt"); try { FileInputStream fis = new FileInputStream(file); int b; try { while ((b = fis.read()) != -1) { System.out.println((char) b); } fis.close(); } catch (IOException e) { System.out.println(e); } } catch (FileNotFoundException e) { System.out.println(e); } } }
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