DomainClassConverter在Spring Boot中不工作

Question

我有一个非常简单的Spring Boot MVC项目，其中我尝试使用DomainClassConverter直接加载实体。但似乎找不到DomainClassConverter。访问“localhost:8080/one/2”url时，我有以下错误：

无法转换“java”类型的值。lang.String“到所需类型”com。实例测验数据客户“：未找到匹配的编辑器或转换策略

但是DomainClassConverter应该通过Spring Boot启用并管理转换。

我还试图通过@EnableSpringDataWebSupport注释明确地启用它，但它也不起作用。

这是我的控制器代码：

@Controller
public class TestController {

    @Autowired
    private CustomerRepository customerRepository;

    @GetMapping("/all")
    public void all(Model model) {
        Iterable<Customer> customers=customerRepository.findAll();
        model.addAttribute("customers",customers);
    };

    @GetMapping("/one/{customer_id}")
    public void one(@PathVariable("customer_id") Customer customer, Model model) {
        model.addAttribute("customer",customer);
    };
}

客户代码：

@Entity
public class Customer {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Getter
    private Long id;

    @Getter
    @Setter
    private String firstName;

    @Getter
    @Setter
    private String lastName;

    protected Customer() {
    }

    public Customer(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

}

客户仓库：

public interface CustomerRepository extends PagingAndSortingRepository<Customer, Long> {

    List<Customer> findByLastName(String lastName);

    Customer findById(long id);
}

应用程序：

@SpringBootApplication
public class TestApplication {
    public static void main(String[] args) {
        SpringApplication.run(TestApplication.class);
    }
}

最后是构建。渐变：

plugins {
    id 'org.springframework.boot' version '2.3.1.RELEASE'
    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
    id 'java'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '14'

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
//    implementation 'org.springframework.boot:spring-boot-starter-security'
    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    compileOnly 'org.projectlombok:lombok'
    developmentOnly 'org.springframework.boot:spring-boot-devtools'
    runtimeOnly 'org.postgresql:postgresql'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
//    testImplementation 'org.springframework.security:spring-security-test'
}

test {
    useJUnitPlatform()
}

任何想法？

Answer 1

您尝试获取客户id（path变量）作为客户对象。因此，当您尝试访问localhost:8080/one/2时，会出现上述错误。

将客户id（path变量）数据类型更改为相关数据类型（字符串、int等），如下所示，

@GetMapping("/one/{customer_id}")
public void one(@PathVariable("customer_id") String customerId, Model model) {
    ----
};