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通过springboot和thymeleaf将对象从数据库列出到html页面

[英]Listing objects from database to html page via springboot and thymeleaf

 原文  2018-01-15 15:52:48  9   2    java/ html/ spring-mvc/ spring-boot/ thymeleaf

问题描述

我在与thymeleaf的项目中使用Springs MVC框架，我在网上搜索了有关如何通过表格在html页面上从数据库显示对象列表的教程，但没有成功。 如果您有推荐的任何教程，请告诉我，或者如果您知道如何实现我要做的事情

这是我的控制器代码，它不执行任何操作，因为它是不正确的： 

@Controller
public class HomeController {
@Autowired
TeamRepository teamRepository;
  @RequestMapping(value="/showteams", method=RequestMethod.GET)
   public Set<Team> teams()
   {       
       Set<Team> teams = (Set<Team>) teamRepository.findAll();         
       return teams;
   }

我的存储库代码： 

@Repository
public interface TeamRepository extends JpaRepository<Team, Long> {     
    Team findByTeamName(String teamname);
    Set<Team> listAllTeams();    
}

这是我的团队实体代码： 

@Entity
@Table(name = "team")   
public class Team implements Serializable{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String teamName;
    private int leaguePosition;
    public String teamAddress;
    public String level;

    @OneToOne
    private Manager manager;

    @OneToOne
    private Physio physio;

    @OneToMany(fetch=FetchType.LAZY, cascade=CascadeType.ALL)
     public Set<CoachingStaff> coachingStaff;

    @OneToMany(fetch=FetchType.LAZY, cascade=CascadeType.ALL)
     public Set<Player> players;

    //getter setter constructors

}

而我的html代码： 

<title>Insert title here</title>
</head>
<body>
 <div class="container">

 <div th:if="$(not #lists.isEmpty(teams))">

    <h2> Teams List </h2>

    <table class = "table table-striped">       
    <tr>
    <th> Team Name </th>
    </tr>       
    <tr th:each="team : ${teams]">
    <td th:text="${team.teamName}"></td>
    </tr>

    </table>
 </div>        
 </div>   
</body>
</html>

运行我的应用程序时出现的错误： 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-01-15 15:55:58.377 ERROR 7584 --- [  restartedMain] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'homeController': Unsatisfied dependency expressed through field 'teamRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'teamRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property listAllTeams found for type Team!
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at com.FYP.Club.ClubApplication.main(ClubApplication.java:10) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_60]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_60]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_60]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_60]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.8.RELEASE.jar:1.5.8.RELEASE]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'teamRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property listAllTeams found for type Team!
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    ... 24 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property listAllTeams found for type Team!
    at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:77) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:329) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:309) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:272) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:243) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.Part.<init>(Part.java:76) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:247) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:398) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:378) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:86) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:64) ~[spring-data-jpa-1.11.8.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:103) ~[spring-data-jpa-1.11.8.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:213) ~[spring-data-jpa-1.11.8.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:77) ~[spring-data-jpa-1.11.8.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:436) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:221) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:277) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:263) ~[spring-data-commons-1.13.8.RELEASE.jar:na]
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:101) ~[spring-data-jpa-1.11.8.RELEASE.jar:na]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    ... 34 common frames omitted

2 个解决方案

解决方案1
 1 已采纳  2018-01-15 16:05:31

首先在HomeController ，返回Set<Team>而不是百里香叶视图。 您应该将集合添加到模型中以在视图中使用它。 

@RequestMapping(value="/showteams", method=RequestMethod.GET)
public String teams()
{
   Set<Team> teams = (Set<Team>) teamRepository.findAll();
   model.addAttribute("teams", teams);
   return "teams";//here your name of your view (html)
}

第二个问题是您的html。 出现错误 

<tr th:each="team : ${teams]">

更改为： 

<tr th:each="team : ${teams}">

我看到的第三个问题是您的存储库注释。 通常，您不需要指定存储库。 因此，删除注释。

例外：您需要为listAllTeams()方法指定自定义@Query() 。 但是，如果要查找所有团队，则扩展的JPARepository已经具有该findAll() 。 使用它并删除Set<Team> listAllTeams(); 条目。

解决方案2
 0  2018-01-15 16:23:05

嗨，更改存储库，如下所示添加@Qualifier（“ teamRepository”），希望它能正常工作。 

@Qualifier("teamRepository")
@Repository
public interface TeamRepository extends JpaRepository<Team, Long> {     
    Team findByTeamName(String teamname);
    Set<Team> listAllTeams();    
}

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