Java 如何处理UnresolvedAddressException异常

当在 Java 程序中遇到 UnresolvedAddressException 异常时，可从异常捕获、异常日志记录、输入验证、重试机制、备用地址处理等方面进行处理，下面为你详细介绍：

1. 捕获并处理异常

在代码里使用 try-catch 块捕获 UnresolvedAddressException 异常，然后依据具体状况进行处理。比如，输出错误信息或者采取其他恢复措施。

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.UnresolvedAddressException;public class ExceptionHandlingExample {public static void main(String[] args) {try {DatagramChannel channel = DatagramChannel.open();// 假设这里是一个可能未解析的地址InetSocketAddress address = new InetSocketAddress("invalidaddress", 8080);ByteBuffer buffer = ByteBuffer.wrap("Hello".getBytes());channel.send(buffer, address);} catch (UnresolvedAddressException e) {System.err.println("地址解析失败: " + e.getMessage());// 可以在这里添加更多的处理逻辑，如提示用户检查地址} catch (Exception e) {e.printStackTrace();}}
}

2. 记录异常日志

使用日志框架（像 Log4j、SLF4J 等）记录异常信息，这样有助于后续的问题排查和系统维护。

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.UnresolvedAddressException;public class LoggingExample {private static final Logger logger = LoggerFactory.getLogger(LoggingExample.class);public static void main(String[] args) {try {DatagramChannel channel = DatagramChannel.open();InetSocketAddress address = new InetSocketAddress("invalidaddress", 8080);ByteBuffer buffer = ByteBuffer.wrap("Hello".getBytes());channel.send(buffer, address);} catch (UnresolvedAddressException e) {logger.error("地址解析失败", e);} catch (Exception e) {logger.error("发生其他异常", e);}}
}

5. 提供备用地址

当一个地址解析失败时，可以尝试使用备用地址。

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.UnresolvedAddressException;public class BackupAddressExample {public static void main(String[] args) {String primaryAddress = "invalidaddress";String backupAddress = "validaddress";try {DatagramChannel channel = DatagramChannel.open();InetSocketAddress address = new InetSocketAddress(primaryAddress, 8080);ByteBuffer buffer = ByteBuffer.wrap("Hello".getBytes());channel.send(buffer, address);} catch (UnresolvedAddressException e) {System.err.println("主地址解析失败，尝试备用地址");try {DatagramChannel channel = DatagramChannel.open();InetSocketAddress backup = new InetSocketAddress(backupAddress, 8080);ByteBuffer buffer = ByteBuffer.wrap("Hello".getBytes());channel.send(buffer, backup);} catch (Exception ex) {ex.printStackTrace();}} catch (Exception e) {e.printStackTrace();}}
}