Java中IO流：read/write操作实例

原创男娘i 2024-12-06 12:39 13阅读 0赞

在Java中，IO流（Input/Output Streams）是用于处理文件、网络连接等数据的API。以下是一些读写操作的例子：

1. **File Reader** - 读取文件内容

```java
import java.io.*;

public class FileReaderExample {
    public static void main(String[] args) {
        String fileName = "example.txt"; // 文件名
        try (BufferedReader br = new BufferedReader(new FileReader(fileName)))) {
            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
```

2. **File Writer** - 写入文件内容

```java
import java.io.*;

public class FileWriterExample {
    public static void main(String[] args) {
        String fileName = "example.txt"; // 文件名
        String content = "This is a test content." + System.lineSeparator(); // 要写入的内容

try (FileWriter writer = new FileWriter(fileName)) {
            writer.write(content);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
```

3. **Socket通信** - 通过网络连接进行数据读写

```java
import java.io.*;
import java.net.*;

public class SocketExample {
    public static void main(String[] args) {
        String serverAddress = "localhost"; // 服务器地址
        int serverPort = 8080; // 服务器端口

try (Socket socket = new Socket(serverAddress, serverPort))) {
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()))));
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true));

System.out.println("Connected to the server!");

// 发送数据
            out.println("Hello from client!");

// 读取服务器响应数据
            String responseFromServer = in.readLine();
            System.out.println("Received response from server: " + responseFromServer);

} catch (IOException e) {
            e.printStackTrace();
            System.out.println("Error connecting to the server.");
        }
    }
}
```

以上实例展示了Java中IO流的读写操作，包括文件、网络连接等。