详解Java中IO操作及异常处理实例

原创「爱情、让人受尽委屈。」 2024-10-08 14:12 134阅读 0赞

在Java中，I/O（Input/Output）操作主要用于与文件、网络、设备等进行数据交换。以下是一些主要的I/O操作和异常处理的例子：

1. **文件读写**：
```java
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

try {
    // 文件写入
    File file = new File("example.txt");
    FileWriter writer = new FileWriter(file);
    writer.write("Hello, World!");
    writer.close();

// 文件读取
    FileReader reader = new FileReader(file);
    String content = new String(reader.readAll()));
    System.out.println(content);  // 输出 "Hello, World!"
} catch (IOException e) {
    System.err.println("An error occurred during I/O operation: " + e.getMessage());
    e.printStackTrace();
}
```

2. **网络编程**：
```java
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class NetworkServer {
    public static void main(String[] args) {
        try (ServerSocket server = new ServerSocket(8000))) {
            System.out.println("Server is listening on port 8000...");

while (true) {
                Socket client = server.accept();
                System.out.println("New connection from " + client.getRemoteSocketAddress()));

// 实际的业务逻辑，这里只是简单接收数据
                try (Socket socket = new Socket("localhost", 9000));) {
                    String message = "Hello, Client! This is the Server's response.";
                    byte[] data = message.getBytes();

System.out.println("Sending data to client...");

// 发送数据到客户端
                    socket.getOutputStream().write(data);
                }
            }
        } catch (IOException e) {
            System.err.println("An error occurred during network communication: " + e.getMessage());
            e.printStackTrace();
        }
    }
}
```

这些例子展示了Java中基本的I/O操作，以及如何处理可能出现的异常。