Spring MVC控制器返回请求

Question

我正在使用Spring Boot构建Spring MVC应用程序。 由于某种原因，每当我从Controller返回ModelAndView ，这只会发送另一个请求，而不是返回JSP页面。

日志使此问题变得明显。

2016-02-17 14:24:47 DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'dispatcherServlet' processing GET request for [/login]
2016-02-17 14:24:47 DEBUG o.s.w.s.m.m.a.RequestMappingHandlerMapping - Looking up handler method for path /login
2016-02-17 14:24:47 DEBUG o.s.w.s.m.m.a.RequestMappingHandlerMapping - Returning handler method [public org.springframework.web.servlet.ModelAndView com.locker.controller.LoginController.login()]
2016-02-17 14:24:47 DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'loginController'
2016-02-17 14:24:47 DEBUG o.s.web.servlet.DispatcherServlet - Last-Modified value for [/login] is: -1
2016-02-17 14:24:47 DEBUG o.s.w.s.view.BeanNameViewResolver - No matching bean found for view name 'login'
2016-02-17 14:24:47 DEBUG o.s.b.f.s.DefaultListableBeanFactory - Invoking afterPropertiesSet() on bean with name 'login'
2016-02-17 14:24:47 DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
2016-02-17 14:24:47 DEBUG o.s.web.servlet.DispatcherServlet - Rendering view [org.springframework.web.servlet.view.JstlView: name 'login'; URL [/WEB-INF/pages/login.jsp]] in DispatcherServlet with name 'dispatcherServlet'
2016-02-17 14:24:47 DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'requestDataValueProcessor'
2016-02-17 14:24:47 DEBUG o.s.web.servlet.view.JstlView - Forwarding to resource [/WEB-INF/pages/login.jsp] in InternalResourceView 'login'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 1 of 12 in additional filter chain; firing Filter: 'WebAsyncManagerIntegrationFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 2 of 12 in additional filter chain; firing Filter: 'SecurityContextPersistenceFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 3 of 12 in additional filter chain; firing Filter: 'HeaderWriterFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 4 of 12 in additional filter chain; firing Filter: 'CsrfFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 5 of 12 in additional filter chain; firing Filter: 'LogoutFilter'
2016-02-17 14:24:47 DEBUG o.s.s.w.u.m.AntPathRequestMatcher - Request 'GET /web-inf/pages/login.jsp' doesn't match 'POST /logout
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 6 of 12 in additional filter chain; firing Filter: 'UsernamePasswordAuthenticationFilter'
2016-02-17 14:24:47 DEBUG o.s.s.w.u.m.AntPathRequestMatcher - Request 'GET /web-inf/pages/login.jsp' doesn't match 'POST /login
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 7 of 12 in additional filter chain; firing Filter: 'RequestCacheAwareFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 8 of 12 in additional filter chain; firing Filter: 'SecurityContextHolderAwareRequestFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 9 of 12 in additional filter chain; firing Filter: 'AnonymousAuthenticationFilter'
2016-02-17 14:24:47 DEBUG o.s.s.w.a.AnonymousAuthenticationFilter - SecurityContextHolder not populated with anonymous token, as it already contained: 'org.springframework.security.authentication.AnonymousAuthenticationToken@9055c2bc: Principal: anonymousUser; Credentials: [PROTECTED]; Authenticated: true; Details: org.springframework.security.web.authentication.WebAuthenticationDetails@b364: RemoteIpAddress: 0:0:0:0:0:0:0:1; SessionId: null; Granted Authorities: ROLE_ANONYMOUS'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 10 of 12 in additional filter chain; firing Filter: 'SessionManagementFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 11 of 12 in additional filter chain; firing Filter: 'ExceptionTranslationFilter'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp at position 12 of 12 in additional filter chain; firing Filter: 'FilterSecurityInterceptor'
2016-02-17 14:24:47 DEBUG o.s.security.web.FilterChainProxy - /WEB-INF/pages/login.jsp reached end of additional filter chain; proceeding with original chain
2016-02-17 14:24:47 DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'dispatcherServlet' processing GET request for [/WEB-INF/pages/login.jsp]
2016-02-17 14:24:47 DEBUG o.s.w.s.m.m.a.RequestMappingHandlerMapping - Looking up handler method for path /WEB-INF/pages/login.jsp
2016-02-17 14:24:47 DEBUG o.s.w.s.m.m.a.RequestMappingHandlerMapping - Returning handler method [public java.lang.String com.locker.controller.LoginController.errorHandler()]
2016-02-17 14:24:47 DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'loginController'

为了测试这一点，我添加了一个额外的RequestMapping来处理新请求：

@RestController
public class LoginController {

private static final Logger logger =
        LoggerFactory.getLogger(LoginController.class);

@RequestMapping(value = "/login", method = RequestMethod.GET)
public ModelAndView login() {

    logger.debug("welcome() is executed, value {}", "mkyong");

    ModelAndView model = new ModelAndView("login");

    return model;
    // localhost:8080/WEB-INF/pages/login.jsp
}

@RequestMapping("WEB-INF/pages/login.jsp")
public String errorHandler() {
    return "Yup, this happened.";
}
}

这是MvcConfig ：

@Configuration
@EnableWebMvc
@EnableTransactionManagement
@ComponentScan(basePackages = { "com.locker"})
@PropertySource("classpath:application.properties")
public class MvcConfig extends WebMvcConfigurerAdapter {

@Override
public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/").setViewName("home");
    registry.addViewController("/test").setViewName("test");
    registry.addViewController("/login").setViewName("login");
}

@Bean
public InternalResourceViewResolver setupViewResolver() {
    InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
    viewResolver.setViewClass(JstlView.class);
    viewResolver.setPrefix("/WEB-INF/pages/");
    viewResolver.setSuffix(".jsp");
    return viewResolver;
}

@Bean
public DefaultAnnotationHandlerMapping getDefaultAnnotationHandlerMapping() {
    DefaultAnnotationHandlerMapping handlerMapping = new DefaultAnnotationHandlerMapping();
    handlerMapping.setAlwaysUseFullPath(true);
    handlerMapping.setDetectHandlersInAncestorContexts(true);
    return handlerMapping;
}
}

和web.xml ：

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

当然，login.jsp被添加到/ WEB-INF / pages /文件夹中

为什么它发送另一个请求而不是返回JSP页面？

Answer 1

以@JB Nizet的评论为基础：

• 嵌入式Tomcat和Jetty Servlet容器不支持呈现JSP
• 如果您要在IDE之外运行Spring Boot应用程序，则很有可能使用嵌入式servlet容器之一运行它。
• 如果您正在使用spring-boot-web-starter依赖项，那么Tomcat是默认的嵌入式容器

如果您没有在使用JSP上投入大量资金，那么Thymeleaf模板引擎是使用JSP的绝佳选择，JSP可以很容易地与Spring Boot集成，如[通过Spring MVC服务Web内容]所示。 由于Thymeleaf扩展了现有的HTML标记，因此您可以处理页面的布局并浏览浏览它，而无需JSP编译。 对于Spring Boot，仅包含spring-boot-thymeleaf-starter依赖项将导致Spring Boot自动配置Thymeleaf视图解析器。

如果您确实对使用JSP进行了大量投资，那么您将需要生成@Randyr链接到的文档所讨论的WAR文件，并将其部署到独立的servlet容器中。 大多数现代的IDE中都通过附加配置来支持该功能。

另一件事确实对我很重要-您正在控制器上使用@RestController批注，但这似乎不是REST Web服务，而是Web应用程序。 使用@RestController可能会或可能不会在这里引起胃灼热，但是这会使后面的人感到困惑-使用@Controller更合适，因为您将返回ModelAndView而不是将要转换为适当内容的请求正文媒体类型。