Spitter不满足依赖关系异常Spring MVC

Question

我从Spring MVC开始，阅读了《Spring in Action》一书，我正在使用Spitter应用程序进行第5章的练习，但我遇到了以下错误：

org.springframework.beans.factory.[C：\xampp\htdocs.metadata.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\spitter\WEB-INF\class\com\spitter\web\SpittleController.class]：通过索引为0的构造函数参数表示的未满足的依赖项[com.spitter.data.SpittleRepostory]：：未找到依赖项类型为[com.spitter.data.SpittleRepostory]的合格bean：预计至少有1个bean符合此依赖项的自动连接候选条件。依赖项注释：{}；嵌套异常org.springframework.beans.factory.NoSuchBean定义异常：未找到依赖项类型为[com.spitter.data.SpittleRepostory]的合格bean：预计至少有1个bean符合此依赖项的自动连接候选条件。依赖项注释：{}

我在github得到了这个项目:https://github.com/kevingcfcb88/spitter.git

我已经做了研究，但似乎没有什么工作。

我用的是STS和Maven，这是app的结构:

这是我的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.spitter.config</groupId>
<artifactId>spitter</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>

<name>spitter</name>
<url>http://maven.apache.org</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <springframework.version>4.1.5.RELEASE</springframework.version>
</properties>

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>          
        <version>2.3.1</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.0</version>
    </dependency>

</dependencies>

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <warSourceDirectory>src/main/webapp</warSourceDirectory>
                    <warName>spitter</warName>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
    <finalName>spitter</finalName>
</build>

以及我的配置文件：

SpitrWebAppInitializer.java

 package com.spitter.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class SpittrWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{

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

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

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

}

WebConfig.java

package com.spitter.config;

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

@Configuration
@EnableWebMvc
@ComponentScan("com.spitter.web")
public class WebConfig extends WebMvcConfigurerAdapter {

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        return resolver;
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

}

根配置.java

package com.spitter.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

@Configuration
@ComponentScan(basePackages = { "com.spitter.data" }, excludeFilters = {@Filter(type = FilterType.ANNOTATION, value = EnableWebMvc.class) })
public class RootConfig {

}

Answer 1

我知道这个密码。两年前它曾让我头疼。错误在代码或书中。

转到发行商网站并下载更新的源代码。这里

或

https://www.manning.com/books/spring-in-action-fourth-edition

Answer 2

你只需要添加一个在标题中带有@Repository的SpittleRepository的存储库实现，因为即使你添加了实现类，Spring IOC也不知道实际的依赖关系，如果你把所有的java文件放在同一个包层次结构中，书中的例子应该可以工作与存储库实现。

@Repository
public class SpittleRepositoryDAO implements SpittleRepository {

    public SpittleRepositoryDAO() {

    }

    @Override
    public List<Spittle> findSpittles(long max, int count) {
        List<Spittle> spittles = new ArrayList<Spittle>();
        for (int i = 0; i < count; i++) {
            spittles.add(new Spittle("Spittle " + i, new Date()));
        }
        return spittles;
    }
}

Answer 3

正如@mh-dev所解释的那样，你需要一个SpittleRepository的实现。尝试添加此类，看看您的代码是否可以运行：

public class SpittleRepositoryImpl implements SpittleRepository {

  List <Spittle> findSpittles(long max, int count) {
    System.out.println("I need a real implementation! " 
      + "I received max as " + max + " and count as " + count + ".");
  }

}

我建议重新阅读这本书的相关章节，以确保你没有遗漏任何内容。