当我试图从我的MySQL数据库codedecode使用HTTP获取方法访问数据无论是在浏览器客户端或 Postman 客户端有空花括号数组[{}]显示。但是，我的数据库里有数据。我已经附上了我所有的代码，包括我的Pom.xml和我的项目的应用程序 prop 的依赖关系。

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>3.1.1</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.codedecode</groupId>
<artifactId>CodeDecodeCRUD</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>CodeDecodeCRUD</name>
<description>Demo project for Spring Boot and Hibernate</description>
<properties>
    <java.version>17</java.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
            <excludes>
            <exclude>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </exclude>
        </excludes>
        </configuration>
     </plugin>
    </plugins>
</build>
</project>

字符串

Spring Container

package com.codedecode.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

型

员工休息控制器

package com.codedecode.demo.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.codedecode.demo.entity.Employee;
import com.codedecode.demo.repos.EmployeeCrudRepo;

@RestController
@RequestMapping("/code")
public class EmployeeController {

    @Autowired
    EmployeeCrudRepo empCrud;
    
    @GetMapping("/getall")
    public List<Employee> getAllEmployees() {
        System.out.println("getting all employees");
    return empCrud.findAll();
    }   
}

型

员工主体

package com.codedecode.demo.entity;

import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.Table;

import lombok.Data;

@Entity
@Table(name = "emp")
@Data
public class Employee {
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    
    private String name;
}

型

员工CRUD仓库

package com.codedecode.demo.repos;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.codedecode.demo.entity.Employee;

@Repository
public interface EmployeeCrudRepo extends JpaRepository<Employee, Long>{    
    
}

型

应用.属性

#server.port=9090
#spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/codedecode?useSSL=false
spring.datasource.username=root
spring.datasource.password=root

spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQLDialect
spring.jpa.hibernate.ddl-auto=create
#spring.jpa.show-sql=true
#spring.jpa.properties.hibernate.format_sql=true

型
我用的是，MySQL v8.0.33，Spring v3.1.1，Java v17，STS v4，lombok v1.18.28
我试着检查我的MySQL数据库的配置，但一切正常。服务器运行时创建表。
我试着重新检查我的代码和所有的依赖项，但找不到任何问题。