Spring Boot H2 简明教程

Spring Boot & H2 - Get Record

现在让我们来更新到目前为止创建的项目，以准备一个完整的获取记录 API 并对其进行测试。

Update Service

// Use repository.findById() to get Employee entity by Id
public Employee getEmployeeById(int id) {
   return repository.findById(id).get();
}

EmployeeService

package com.tutorialspoint.service;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.tutorialspoint.entity.Employee;
import com.tutorialspoint.repository.EmployeeRepository;
@Service
public class EmployeeService {
   @Autowired
   EmployeeRepository repository;
   public Employee getEmployeeById(int id) {
      return repository.findById(id).get();
   }
   public List<Employee> getAllEmployees(){
      return null;
   }
   public void saveOrUpdate(Employee employee) {
      repository.save(employee);
   }
   public void deleteEmployeeById(int id) {
   }
}

Update Controller

// Use service.getEmployeeById() to get Employee entity from database
@GetMapping("/employee/{id}")
public Employee getEmployee(@PathVariable("id") int id) {
   return employeeService.getEmployeeById(id);
}

EmployeeController

package com.tutorialspoint.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.tutorialspoint.entity.Employee;
import com.tutorialspoint.service.EmployeeService;
@RestController
@RequestMapping(path = "/emp")
public class EmployeeController {
   @Autowired
   EmployeeService employeeService;
   @GetMapping("/employees")
   public List<Employee> getAllEmployees(){
      return null;
   }
   @GetMapping("/employee/{id}")
   public Employee getEmployee(@PathVariable("id") int id) {
      return employeeService.getEmployeeById(id);
   }
   @DeleteMapping("/employee/{id}")
   public void deleteEmployee(@PathVariable("id") int id) {
   }
   @PostMapping("/employee")
   public void addEmployee(@RequestBody Employee employee) {
      employeeService.saveOrUpdate(employee);
   }
   @PutMapping("/employee")
   public void updateEmployee(@RequestBody Employee employee) {
   }
}

Run the application

在 Eclipse 中，按照在 Application Setup 准备期间准备 Employee Application 配置。

Eclipse 控制台将显示类似的输出。

[INFO] Scanning for projects...
...
2021-07-24 20:51:14.823  INFO 9760 --- [  restartedMain] c.t.s.SprintBootH2Application
: Started SprintBootH2Application in 7.353 seconds (JVM running for 8.397)

服务器启动并运行后，使用 Postman 先执行 POST 请求以添加记录。

在 POSTMAN 中设置以下参数。

HTTP Method − POST
URL − http://localhost:8080/emp/employee
正文 - An employee JSON

{
   "id": "1",
   "age": "35",
   "name": "Julie",
   "email": "julie@gmail.com"
}

点击发送按钮并检查响应状态是否为 OK。现在发送一个 GET 请求来获取该记录。

在 POSTMAN 中设置以下参数。

HTTP Method − GET
URL − http://localhost:8080/emp/employee/1

单击发送按钮并验证响应。

{
   "id": "1",
   "age": "35",
   "name": "Julie",
   "email": "julie@gmail.com"
}