Java标准库：IO操作示例

原创亦凉 2024-10-10 06:36 78阅读 0赞

在Java中，标准库提供了丰富的I/O（Input/Output）操作。以下是一些基本的IO操作示例：

1. **文件读写**：
   - `FileInputStream` 和 `FileOutputStream` 用于文件读写。
   ```java
   import java.io.*;

public class FileReadWrite {
       public static void main(String[] args) {
           // 写入文件
           try (FileWriter writer = new FileWriter("example.txt")) {
               writer.write("Hello, World!");
               System.out.println("File written successfully.");
           } catch (IOException e) {
               System.out.println("Error occurred while writing to file: " + e.getMessage());
           }

// 读取文件
           try (BufferedReader reader = new BufferedReader(new FileReader("example.txt")))) {
               String line;
               while ((line = reader.readLine()) != null) {
                   System.out.println(line);
               }
               System.out.println("File read successfully.");
           } catch (IOException e) {
               System.out.println("Error occurred while reading from file: " + e.getMessage());
           }
       }
   }
   ```

2. **网络通信**：
   - `Socket` 和 `ServerSocket` 用于建立客户端与服务器的连接。
   ```java
   import java.io.*;
   import java.net.*;

public class NetworkCommunication {
       public static void main(String[] args) throws IOException {
           // 客户端连接到服务器
           try (Socket client = new Socket("localhost", 1234));) {
               System.out.println("Connected to server.");

// 发送数据
               DataOutputStream out = new DataOutputStream(client.getOutputStream()));
               out.writeUTF("Hello, Server!");

// 接收数据
               DataInputStream in = new DataInputStream(client.getInputStream()));
               String receivedData = in.readUTF();
               System.out.println("Received data from server: " + receivedData);

} catch (IOException e) {
               System.out.println("Error occurred while connecting to server: " + e.getMessage());
           }
       }
   }
   ```

以上示例展示了Java标准库中IO操作的基本用法。在实际项目开发中，根据需求可能会使用更复杂的I/O处理。