这是一个springboot应用程序。它运行完美，但没有输出（它显示我在浏览器中的HTTP状态404错误）
的pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.exaample.demo</groupId>
<artifactId>SpringBootMaven</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Maven spring boot project</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
</project>
Springboot启动类 主要方法
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class WebMainMethod {
public static void main(String[] args) {
SpringApplication.run(WebMainMethod.class, args);
}
}
controller is loading after main class
**Rest Controller**
package com.example.demo.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@RequestMapping("/hello")
public String sayHi() {
return "Hi";
}
}
答案 0 :(得分：0)
无法重现问题。
这不是答案，但我从问题中复制了3个文件，并且没有问题地构建和运行代码。我的控制台日志有点不同，包括在下面，这就是我发布这个作为答案的原因。
尝试进行干净的构建。也许这将解决问题。
控制台日志
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.9.RELEASE)
2017-12-02 02:06:19.763 INFO 13268 --- [ main] com.example.demo.WebMainMethod : Starting WebMainMethod on XXXX with PID 13268 (C:\Users\XXXX\SpringBootMaven\target\classes started by Andreas in C:\Users\XXXX\SpringBootMaven)
2017-12-02 02:06:19.765 INFO 13268 --- [ main] com.example.demo.WebMainMethod : No active profile set, falling back to default profiles: default
2017-12-02 02:06:19.794 INFO 13268 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4f51b3e0: startup date [Sat Dec 02 02:06:19 EST 2017]; root of context hierarchy
2017-12-02 02:06:20.631 INFO 13268 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-12-02 02:06:20.641 INFO 13268 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-12-02 02:06:20.642 INFO 13268 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2017-12-02 02:06:20.751 INFO 13268 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-12-02 02:06:20.751 INFO 13268 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 959 ms
2017-12-02 02:06:20.824 INFO 13268 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-12-02 02:06:20.826 INFO 13268 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-12-02 02:06:20.827 INFO 13268 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-12-02 02:06:20.827 INFO 13268 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-12-02 02:06:20.827 INFO 13268 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-12-02 02:06:21.025 INFO 13268 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4f51b3e0: startup date [Sat Dec 02 02:06:19 EST 2017]; root of context hierarchy
2017-12-02 02:06:21.071 INFO 13268 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.example.demo.controller.HelloController.sayHi()
2017-12-02 02:06:21.074 INFO 13268 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-12-02 02:06:21.074 INFO 13268 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-12-02 02:06:21.095 INFO 13268 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-02 02:06:21.095 INFO 13268 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-02 02:06:21.119 INFO 13268 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-02 02:06:21.195 INFO 13268 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-12-02 02:06:21.271 INFO 13268 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-12-02 02:06:21.273 INFO 13268 --- [ main] com.example.demo.WebMainMethod : Started WebMainMethod in 1.908 seconds (JVM running for 2.231)
2017-12-02 02:06:38.426 INFO 13268 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2017-12-02 02:06:38.426 INFO 13268 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2017-12-02 02:06:38.435 INFO 13268 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 9 ms
答案 1 :(得分：0)
也许你的模板不存在。请指定具有恢复值的地图模板的文件名。检查此示例
@Controller
public class HelloWorldController {
@RequestMapping("/hello")
public String hello(Model model, @RequestParam(value="name", required=false, defaultValue="World") String name) {
String message="You just create Spring Boot Example successfully";
model.addAttribute("name", name);
model.addAttribute("message", message);
return "hello";
}
}
答案 2 :(得分：0)
您的端口8080似乎存在问题。
请更改端口并尝试重新启动您的应用。
示例：在下面添加到您的application.properties文件
server.port = 8090
答案 3 :(得分：0)
您可以尝试一下。 使用application.properties / yml
更改上下文路径的最直接方法是在application.properties中设置属性： server.servlet.context-path = / demoApp
除了将属性文件放在src / main / resources中之外，我们还可以将其保存在当前的工作目录中（类路径之外）。 Java系统属性。
http://localhost:8090/demoApp/hello 有关更多信息。 https://www.baeldung.com/spring-boot-context-path
答案 4 :(得分：-1)
你是否创建了一个名为hi的jsp或html页面...检查你的观点...你没有要查看的页面....请创建一个jsp并将其放在
上 @RequestMapping("/hello")
public String sayHi(Model model) {
model.addAttribute("Hi","Hi")
return "Hi";
}
jsp页面必须为Hi