java - 注解配置-spring配置类位置怎么说

Question

Spring 看不到我的 Controller 的请求映射。我尝试使用不带 xml 的注解配置。

项目结构:

配置.java

package com.dnn.web.config;
//imports
@Configuration
@ComponentScan("com.dnn.spring")   
@EnableWebMvc
public class Config {    
    @Bean
    public UrlBasedViewResolver setupViewResolver() {
        UrlBasedViewResolver resolver = new UrlBasedViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        return resolver;
    }
}

WebInitializer.java

 package com.dnn.web.config;    
  //imports    
    public class WebInitializer implements WebApplicationInitializer {

        public void onStartup(ServletContext servletContext)
                throws ServletException {

            AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
            ctx.register(Config.class);

            ctx.setServletContext(servletContext);

            Dynamic servlet = servletContext.addServlet("dispatcher", new DispatcherServlet(ctx));
            servlet.addMapping("/");
            servlet.setLoadOnStartup(1);        
        }        
    }

HelloWorldController.java

package com.dnn.spring.controller;
//imports
@Controller
public class HelloWorldController {
    @RequestMapping("/hello")
    public String hello( @RequestParam(value = "name", required = false, defaultValue = "World") String name,   Model model) {
        model.addAttribute("name", name);
        return "helloworld";
    }
}

当我调用这个应用程序时，我看到以下结果:

localhost:8080/dnn-project/hello

返回相同的结果。

我真的不明白我哪里弄错了。

附言此示例的源代码:source

我想 Spring 没有看到 Config 和 WebInitializer 类，但我不明白为什么以及如何修复它。

附言

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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.dnn.web</groupId>
    <artifactId>dnn-project</artifactId>
    <packaging>war</packaging>
    <version>1.0.0-SNAPSHOT</version>
    <name>dnn-project Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <properties>
        <spring.version>4.0.1.RELEASE</spring.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- Spring dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>
    <build>
        <finalName>dnn-project</finalName>
    </build>
</project>

P.S.3

如果向这个url发送请求

http://localhost:8080/hello

然后

 мар 22, 2014 1:44:33 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [] threw exception [Handler processing failed; nested exception is java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config] with root cause
java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config
    at org.springframework.web.servlet.support.JstlUtils.exposeLocalizationContext(JstlUtils.java:101)
    at org.springframework.web.servlet.view.JstlView.exposeHelpers(JstlView.java:135)

...

Answer 1

实际上，您的 Spring 配置没有问题。唯一缺少的部分是 JSTL 依赖项:

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

Tomcat 不包含 JSTL，因此它必须与您的应用程序一起提供。