Java中IO流的读写操作示例-蒲公英云

Java中IO流的读写操作示例

在Java中，IO流主要用于文件、网络等设备的输入输出。以下是一些读写操作示例：

文件读写：

读取文件：

try (BufferedReader br = new BufferedReader(new FileReader("example.txt")))) {
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException e) {
    e.printStackTrace();
}

写入文件：

try (PrintWriter writer = new PrintWriter(new FileWriter("example.txt", true)))) {
    writer.println("Hello, World!");
    writer.println("New Line 1");
    writer.println("New Line 2");
} catch (IOException e) {
    e.printStackTrace();
}

网络读写：

使用Socket进行读写：

import java.io.*;
import java.net.*;
public class SocketExample {
    public static void main(String[] args) throws IOException {
        // 创建Socket对象
        Socket socket = new Socket("localhost", 1234)); // replace with the correct IP and port
        // 获取输入输出流
        InputStream inStream = socket.getInputStream();
        OutputStream outStream = socket.getOutputStream();
        // 读写操作
        byte[] buffer = new byte[1024]; // buffer size can be adjusted as needed
        String readMessage;
        // 读取数据
        while ((readMessage = new String(inStream.read(buffer), "UTF-8")) != null) {
            System.out.println("Received: " + readMessage);
        }
        // 写入数据
        String writeMessage = "Hello, Server!";
        outStream.write(writeMessage.getBytes("UTF-8")));
        // 关闭流
        inStream.close();
        outStream.close();
        socket.close();
    }
}