Spring MVC基于Java的配置-不检测servlet调度器

Question

我正在编写一个Spring MVC Web应用程序。我正在尝试使用基于Java的配置来配置Spring，但是Spring无法在不添加其他XML配置的情况下检测到我的控制器。

我的前端控制器类如下所示：

package no.magnus.controller; 
public class FrontController extends 
   AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[] {MvcConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return null;
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] {"/"};
    }
}

我的MVC配置类:

package no.magnus.config;
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"no.magnus"})
public class MvcConfig implements WebMvcConfigurer {

    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver vr = new InternalResourceViewResolver();
        vr.setSuffix(".jsp");
        return vr;
    }
}

简单的家用控制器:

package no.magnus.controller;
@Controller
public class HomeController {

    @RequestMapping("/home")
    public ModelAndView index() {

        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("index");
        return modelAndView;
    }
}

正在尝试访问urlhttp://localhost:8080/home我得到一个404错误。如果我将基于XML的配置添加到web。xml以及xml servlet配置，检测和索引家庭控制器。返回jsp。

子集 web.xml：

<servlet>
  <servlet-name>dispatcher</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet
  </servlet-class>
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
  </init-param>
 </servlet>
 <servlet-mapping>
  <servlet-name>dispatcher</servlet-name>
  <url-pattern>/</url-pattern>
 </servlet-mapping>

dispatcher-servlet.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:ctx="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    <ctx:annotation-config/>
    <ctx:component-scan base-package="no.magnus"/>

</beans>

http://localhost:8080/home 索引.jsp已成功返回！

我的期望是Spring MVC能够从java代码中检测Spring MVC配置，从而使上述XML配置变得多余。请澄清我的理解是否错误。

谢啦！

├───java
│   └───no
│       └───magnus
│           ├───config
│           │       MvcConfig.java
│           │
│           └───controller
│                   FrontController.java
│                   HomeController.java
│
└───webapp
    │   result.jsp
    │
    └───WEB-INF       
        │   web.xml
        │
        └───jsp
                index.jsp

Answer 1

http://localhost:8080/home不会调用您的< code>HomeController的< code > index()-Method(/home-Mapping)-在您发布的url中< code>home是您的应用程序的名称，您需要将< code >“/”映射到index.jsp。

请将您的< code>FrontController更改为:

package no.magnus.config; 
public class FrontController extends 
   AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        // from
        // return new Class[] {MvcConfig.class};
        // to
        return null;
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        // from
        // return null;
        // to
        return new Class[] {MvcConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] {"/"};
    }
}

您的MvcConfig应该如下所示:

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;


@EnableWebMvc
@Configuration
// to also scan subpackages for components
@ComponentScan("no.magnus.**")
public class MvcConfig
        implements
            WebMvcConfigurer {
    @Override
    public void configureDefaultServletHandling(final DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
        WebMvcConfigurer.super.configureDefaultServletHandling(configurer);
    }

    @Override
    public void configureViewResolvers(final ViewResolverRegistry registry) {
        registry.viewResolver(this.jspViewResolver());
        WebMvcConfigurer.super.configureViewResolvers(registry);
    }

    @Bean
    public InternalResourceViewResolver jspViewResolver() {
        final InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setOrder(1);
        // jsp-location!!! - please change it to where your jsp's are located
        viewResolver.setPrefix("/WEB-INF/jsp/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }
}

您的HomeController应该如下所示：

package no.magnus.controller;
@Controller("HomeController")
public class HomeController {

    // for the very first start
    // RequestMapping can be replaced with GetMapping
    @GetMapping("/")
    public ModelAndView index() {

        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("index");
        return modelAndView;
    }
}