使用 spring 引导将请求映射到 RestController

Question

大家晚上好，

我最近一直在学习 spring 引导，我正在尝试使用 spring rest 和 spring 引导开发一个简单的 restful 应用程序。

所以我在 WildFly 应用程序服务器上部署应用程序，并且我正在使用编码的应用程序上下文配置。我的问题是应用程序正常启动，没有错误或错误，但是当尝试调用服务时没有任何反应，似乎请求没有映射到控制器。有人可以向我解释一下在这种情况下映射是如何完成的吗？以下是一些似乎有助于解决问题的代码：

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     id="WebApp_ID" version="2.5">
 <display-name>Restfull application</display-name>

 <listener>
  <listener-class>
   org.springframework.web.context.request.RequestContextListener
  </listener-class>
 </listener>

<!-- Configure ContextLoaderListener to use AnnotationConfigWebApplicationContext
     instead of the default XmlWebApplicationContext -->
 <context-param>
  <param-name>contextClass</param-name>
  <param-value>
       org.springframework.web.context.support.AnnotationConfigWebApplicationContext
  </param-value>
</context-param>
<!-- Configuration locations must consist of one or more comma- or space-delimited
   fully-qualified @Configuration classes. Fully-qualified packages may also be
   specified for component-scanning -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>configuration.ApplicationContext</param-value>
 </context-param>

</web-app>

ApplicationContext.java:

@Configuration
@ComponentScan({"DAL","domains","services","controllers","configuration"})
@EnableTransactionManagement
@PropertySource(value = { "classpath:application.properties" })
public class ApplicationContext extends SpringBootServletInitializer {

@Autowired
Environment environment;
private static Class<ApplicationContext> applicationClass = ApplicationContext.class;

public static void main(String[] args) {
    SpringApplication.run(applicationClass, args);
}

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(applicationClass);
}

@Bean(name = "datasource")
public BasicDataSource dataSource() {
    BasicDataSource dataSource = new BasicDataSource();
    dataSource.setDriverClassName(environment.getProperty("jdbc.driverClassName"));
    dataSource.setUrl(environment.getProperty("jdbc.url"));
    dataSource.setUsername(environment.getProperty("jdbc.username"));
    dataSource.setPassword(environment.getProperty("jdbc.password"));
    dataSource.setValidationQuery(environment.getProperty("validationQuery"));
    return dataSource;
}

@Bean
public LocalSessionFactoryBean sessionFactoryBean() {
    LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
    sessionFactoryBean.setDataSource(this.dataSource());
    sessionFactoryBean.setPackagesToScan("*");

    Properties properties = new Properties();
    properties.setProperty("hibernate.dialect",environment.getProperty("hibernate.dialect"));
    properties.setProperty("hibernate.show_sql",environment.getProperty("hibernate.show_sql"));
    properties.setProperty("hibernate.hbm2ddl.auto",environment.getProperty("hibernate.hbm2ddl.auto"));
    sessionFactoryBean.setHibernateProperties(properties);
    return sessionFactoryBean;
}

@Bean
public HibernateTransactionManager transactionManager() {
    HibernateTransactionManager transactionManager = new HibernateTransactionManager();
    transactionManager.setSessionFactory(this.sessionFactoryBean().getObject());
    return transactionManager;
}

@Bean
public GenericRepositoryImpl personRepo() {
    GenericRepositoryImpl<Person,Integer> personRepo = new GenericRepositoryImpl<Person,Integer>();
    return personRepo;
}

@Bean
public PersonServiceImpl personService() {
    return new PersonServiceImpl();
}
}

ContactsController.java:

@RestController
@RequestMapping("/listAll")
public class ContactsController {

@Autowired
private IPersonService personService;


@RequestMapping(method = RequestMethod.GET)
public List<Person> getAllContacts() {
    System.out.println("******** I'am here *********");
    List<Person> contacts = personService.findAllContacts();
    return contacts;
}
}

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>TP2ArchitecturesLogicielles</groupId>
<artifactId>Activite3RestfulWebService</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>

<name>Activite3RestfulWebService Maven Webapp</name>
<url>http://maven.apache.org</url>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.3.RELEASE</version>
</parent>

<repositories>
    <repository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>http://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>http://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>http://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </pluginRepository>
    <pluginRepository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>http://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </pluginRepository>
</pluginRepositories>

<properties>
    <java.version>1.8</java.version>
    <hibernate.version>4.1.0.Final</hibernate.version>
    <spring.version>4.1.4.RELEASE</spring.version>
    <mysql.version>5.1.5</mysql.version>
</properties>

<dependencies>

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

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <!-- Hibernate dependencies -->

    <!-- Hibernate validator -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>${hibernate.version}</version>
    </dependency>

    <!-- Hibernate core -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate.version}</version>
    </dependency>

    <!-- Spring dependencies -->

    <!-- Spring Core -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- Spring Context -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- Spring ORM -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>

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

    <!-- Commons tools -->

    <!-- Commons pool -->
    <dependency>
        <groupId>commons-pool</groupId>
        <artifactId>commons-pool</artifactId>
        <version>1.6</version>
    </dependency>

    <!-- Commons DBCP -->
    <dependency>
        <groupId>commons-dbcp</groupId>
        <artifactId>commons-dbcp</artifactId>
        <version>1.4</version>
    </dependency>

    <!-- MySql connector -->

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>
</project>

提前感谢您的帮助，抱歉过于冗长。

Answer 1

有几处不正确。

首先，您有一个 web.xml，您的 web.xml 用于 2.5 版本的 Servlet API，而不是 3.0。这会禁用 Servlet 3.0 的 ServletContainerInitializer 支持。这有效地禁用了您的 ApplicationContext class 的拾取。而只是删除它。

接下来是您的依赖项，Spring Boot 已经自动管理这些依赖项，并确保您获得所需的框架版本。关于依赖项 Spring Boot 提供了所谓的启动项目（您使用的），它已经引入了不同的依赖项，因此无需再次添加它们。此外 Spring Boot 已经为不同的库设置了依赖项。

修复你的 pom

删除 <properties> 部分
清除依赖项。

你应该有以下 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>TP2ArchitecturesLogicielles</groupId>
<artifactId>Activite3RestfulWebService</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>

<name>Activite3RestfulWebService Maven Webapp</name>
<url>http://maven.apache.org</url>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.3.RELEASE</version>
</parent>

<dependencies>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <!-- Hibernate dependencies -->

    <!-- Hibernate validator -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
    </dependency>

    <!-- Hibernate core -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
    </dependency>

    <!-- Spring ORM -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
    </dependency>


    <!-- Commons DBCP -->
    <dependency>
        <groupId>commons-dbcp</groupId>
        <artifactId>commons-dbcp</artifactId>
    </dependency>

    <!-- MySql connector -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>
</project>

里面有很多不需要的东西，SpringBoot 已经管理版本和正确的依赖关系。

现在最后一部分与您的 ApplicationContext class 有关，它不是完整的 Spring 启动 class。没有启用自动配置。添加 @EnableAutoConfiguration 或简单地将 @Configuration 替换为 @SpringBootApplication。 Spring 引导将自动启用事务，因此您可以删除 @EnableTransactionManagement 并且 application.properties 也已经加载，因此 @PropertySource 也应该去。

另外从 @ComponentScan 判断 ApplicationContext 在一些根包中。这也意味着可以去也。只留下 @SpringBootApplication 注释。

@SpringBootApplication public class ApplicationContext 扩展 SpringBootServletInitializer { ... }

另外提示将来使用 Spring Initializr 设置您的项目。只需点击几下，您就可以获得正确的 pom 和预配置 Application class.

使用 spring 引导将请求映射到 RestController

Mapping requests to RestController with spring boot

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