在Java中处理网络异常：示例解析

原创傷城~ 2024-11-30 11:12 86阅读 0赞

在网络编程中，经常会遇到各种网络异常。以下是一个使用Java处理网络异常的简单示例：

1. 异常定义：
```java
import java.net.ConnectException;
import java.net.UnknownHostException;

// 自定义网络异常类
class CustomNetworkException extends RuntimeException {
    public CustomNetworkException(String message) {
        super(message);
    }
}
```

2. 网络访问代码，附带异常处理：

```java
public void connectToServer() {
    try {
        // 创建Socket对象
        Socket socket = new Socket("localhost", 8080); // "localhost"是你服务器的实际地址

// 开始读写操作
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()))));
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true));

// 与服务器进行交互
        System.out.println("Connected to server!");
        String inputLine;
        while ((inputLine = in.readLine()) != null)) {
            out.println(inputLine);
        }
    } catch (ConnectException e) {
        System.out.println("Failed to connect to server: " + e.getMessage());
        throw new CustomNetworkException("Connection failed", e);
    } catch (UnknownHostException e) {
        System.out.println("Failed to locate server: " + e.getMessage());
        throw new CustomNetworkException("Server not found", e);
    } catch (IOException i) {
        System.out.println("IO Error occurred while connecting to server: " + i.getMessage());
        throw new CustomNetworkException("IO error during connection", i);
    }
}
```

在这个示例中，我们定义了自己的网络异常类`CustomNetworkException`。在实际的网络访问代码中，我们对可能出现的连接失败、服务器未找到等各种网络异常进行了捕获和适当的处理。