详解Java中IO操作及异常处理实例-蒲公英云

详解Java中IO操作及异常处理实例

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：

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();
        }
    }
}