D:\code\JhtjptService\src\main\java\com\bootdo\common\aspect\WebLogAspect.java:13:20 java: 程序包sun.net.util不存在

这个问题通常是由于缺少相关的依赖或者包名错误导致的。要解决这个问题，你可以尝试以下几个步骤：

1. 确保你的代码中引入了正确的依赖。在 Java 中，如果你需要使用 sun.net.util 包中的类，你需要确保你的项目中包含了相应的依赖。你可以在你的构建工具（如 Maven 或 Gradle）的配置文件中添加正确的依赖来解决该问题。

2. 检查包名是否正确。请确保你使用的是正确的包名（sun.net.util），并且没有拼写错误或大小写错误。

3. 检查运行环境。某些类可能仅在特定的运行环境中存在，比如某些类可能是私有 API，只能在特定的 JVM 实现中使用。请确保你的代码在正确的运行环境中运行，或者尝试使用其他可替代的类或方法来达到相同的目的。

如果以上步骤都没有解决你的问题，可以提供更具体的代码片段或错误信息，以便我能够更好地帮助你解决这个问题。

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SPring AOP介绍

Spring AOP (Aspect-Oriented Programming) is a module of the Spring framework that provides a way to implement cross-cutting concerns in a modular and reusable manner. Cross-cutting concerns are features that are common to many parts of an application, such as logging, security, or transaction management.

With Spring AOP, these concerns can be separated from the application's main logic and implemented as reusable aspects. An aspect is a modular unit that encapsulates a set of behaviors, and can be applied to multiple parts of an application, such as methods or classes. The behavior of an aspect is defined using advice, which is code that is executed when a certain pointcut is reached. A pointcut is a specification of when the advice should be executed, based on the join points in the application.

Spring AOP supports several types of advice, such as before advice, which is executed before a method is called, and after advice, which is executed after a method has returned. Spring AOP also supports the use of advisor, which are components that associate a pointcut with advice and apply the aspect to specific beans in the application.

Spring AOP provides a flexible and scalable solution for implementing cross-cutting concerns in a Spring-based application. By using AOP, developers can write cleaner, more maintainable, and modular code, and improve the modularity of the application.