我正在用Spring MVC和H2在内存数据库中编写Spring Boot应用程序。我有一个在 findAllPosts（）方法上映射/ posts的控制器，该方法返回 post.jsp 视图。但是，当我运行应用程序并点击localhost：8080 / posts时，它显示错误页面。在控制台中，它还显示了/ posts的映射。
控制器类-
package com.H2DatabaseDemo.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import com.H2DatabaseDemo.model.Post;
import com.H2DatabaseDemo.services.PostService;
@Controller
public class H2DemoController {
@Autowired
private PostService postService;
@RequestMapping("/posts")
public String findAllPost(Model model)
{
List<Post> thePosts=postService.findAllPost();
model.addAttribute("posts",thePosts);
return "posts";
}
}
应用类别-
package com.H2DatabaseDemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
public class H2DatabaseDemoApplication {
public static void main(String[] args) {
SpringApplication.run(H2DatabaseDemoApplication.class, args);
}
}
属性文件-
spring.h2.console.enabled=true
spring.h2.console.path=/console
spring.datasource.url=jdbc:h2:mem:h2demo-app
spring.mvc.view.prefix: /WEB-INF/view/
spring.mvc.view.suffix: .jsp
堆栈跟踪-
:: Spring Boot :: (v2.0.4.RELEASE)
2018-09-16 09:19:50.379 INFO 12868 --- [ main] c.H.H2DatabaseDemoApplication : Starting H2DatabaseDemoApplication on DESKTOP-7NILS0D with PID 12868 (D:\springCourse\H2DatabaseDemo\target\classes started by Mrugesh in D:\springCourse\H2DatabaseDemo)
2018-09-16 09:19:50.384 INFO 12868 --- [ main] c.H.H2DatabaseDemoApplication : No active profile set, falling back to default profiles: default
2018-09-16 09:19:50.459 INFO 12868 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3d299e3: startup date [Sun Sep 16 09:19:50 IST 2018]; root of context hierarchy
2018-09-16 09:19:52.000 INFO 12868 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$74090544] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-09-16 09:19:52.796 INFO 12868 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-09-16 09:19:52.833 INFO 12868 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-09-16 09:19:52.834 INFO 12868 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.32
2018-09-16 09:19:52.849 INFO 12868 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_171\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_171/bin/server;C:/Program Files/Java/jre1.8.0_171/bin;C:/Program Files/Java/jre1.8.0_171/lib/amd64;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;c:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\nodejs\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\Microsoft VS Code\bin;C:\Program Files\Microsoft VS Code\bin;C:\Users\Mrugesh\AppData\Roaming\npm;C:\Users\Mrugesh\AppData\Local\Microsoft\WindowsApps;C:\Users\Mrugesh\AppData\Local\GitHubDesktop\bin;C:\eclipse;;.]
2018-09-16 09:19:53.018 INFO 12868 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-09-16 09:19:53.018 INFO 12868 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2562 ms
2018-09-16 09:19:53.160 INFO 12868 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-09-16 09:19:53.162 INFO 12868 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet webServlet mapped to [/console/*]
2018-09-16 09:19:53.167 INFO 12868 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-09-16 09:19:53.167 INFO 12868 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-09-16 09:19:53.168 INFO 12868 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-09-16 09:19:53.168 INFO 12868 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-09-16 09:19:53.408 INFO 12868 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-09-16 09:19:53.806 INFO 12868 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2018-09-16 09:19:53.876 INFO 12868 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2018-09-16 09:19:53.905 INFO 12868 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2018-09-16 09:19:54.036 INFO 12868 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.2.17.Final}
2018-09-16 09:19:54.038 INFO 12868 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-09-16 09:19:54.085 INFO 12868 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-09-16 09:19:54.280 INFO 12868 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2018-09-16 09:19:54.962 INFO 12868 --- [ main] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@93824eb'
2018-09-16 09:19:54.965 INFO 12868 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-09-16 09:19:55.623 INFO 12868 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-16 09:19:55.918 INFO 12868 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3d299e3: startup date [Sun Sep 16 09:19:50 IST 2018]; root of context hierarchy
2018-09-16 09:19:55.974 WARN 12868 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-09-16 09:19:56.017 INFO 12868 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/posts]}" onto public java.lang.String com.H2DatabaseDemo.controller.H2DemoController.findAllPost(org.springframework.ui.Model)
2018-09-16 09:19:56.027 INFO 12868 --- [ 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.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-09-16 09:19:56.028 INFO 12868 --- [ 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.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-09-16 09:19:56.060 INFO 12868 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-16 09:19:56.060 INFO 12868 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-16 09:19:56.366 INFO 12868 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-09-16 09:19:56.370 INFO 12868 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Bean with name 'dataSource' has been autodetected for JMX exposure
2018-09-16 09:19:56.378 INFO 12868 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2018-09-16 09:19:56.610 INFO 12868 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-09-16 09:19:56.614 INFO 12868 --- [ main] c.H.H2DatabaseDemoApplication : Started H2DatabaseDemoApplication in 6.721 seconds (JVM running for 7.372)
2018-09-16 09:20:06.742 INFO 12868 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-09-16 09:20:06.742 INFO 12868 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2018-09-16 09:20:06.884 INFO 12868 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 142 ms
2018-09-16 09:20:07.138 INFO 12868 --- [nio-8080-exec-1] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory
答案 0 :(得分：0)
在控制器方法上添加RequestMapping（“ /”）
答案 1 :(得分：0)
请在您的pom.xml中添加这些依赖项
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>