Spring Boot，Java 配置 - 在名为“dispatcherServlet”的 DispatcherServlet 中未找到带有 URI [...]

使用Spring Boot开发Web应用程序时，我们经常会遇到名为“dispatcherServlet”的DispatcherServlet找不到HTTP请求映射的问题。这个错误信息可能会让我们感到困惑，因为我们在配置中已经明确指定了请求的URI路径。本文将详细介绍这个问题的原因，并提供解决方法。

java
@Configuration
public class DispatcherServletConfig extends WebMvcConfigurerAdapter {
    @Bean
    public ServletRegistrationBean dispatcherServletRegistration() {
        ServletRegistrationBean registration = new ServletRegistrationBean(new DispatcherServlet(), "/api/*");
        registration.setName("dispatcherServlet");
        return registration;
    }
}

java
@RestController
@RequestMapping("/api")
public class ExampleController {
    @GetMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }
}
@Configuration
public class DispatcherServletConfig extends WebMvcConfigurerAdapter {
    @Bean
    public ServletRegistrationBean dispatcherServletRegistration() {
        ServletRegistrationBean registration = new ServletRegistrationBean(new DispatcherServlet(), "/api/*");
        registration.setName("dispatcherServlet");
        return registration;
    }
}