调用域名java.net.UnknownHostException:

调用java.net.UnknownHostException:是指在使用Java程序时，尝试访问一个域名时出现无法解析的异常。这个异常通常是由于DNS解析问题导致的。在引用中提到了一个具体的例子，当尝试访问openapi.alipay.com时出现了UnknownHostException异常。根据引用和引用的内容，可能是由于DNS解析服务器换了IP地址，而JVM缓存了旧的DNS IP，导致无法解析域名。解决这个问题的方法是清除JVM的DNS缓存，让它重新进行DNS解析。如果你使用的是Linux系统，可以通过执行命令"sudo /etc/init.d/networking restart"重启网络服务来清除DNS缓存。希望这个回答能帮到你。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [Caused by: java.net.UnknownHostException: openapi.alipay.com](https://download.csdn.net/download/u011496822/10749662)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
- *2* *3* [java.net.UnknownHostException](https://blog.csdn.net/hawinlolo/article/details/122254968)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
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