Spring Boot & H2 - 获取所有记录

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现在让我们更新到目前为止创建的项目以准备完整的获取所有记录 API 并测试它。

更新服务

// Use repository.findAll() to get all Employee records
public List<Employee> getAllEmployees(){
   List<Employee> employees = new ArrayList<Employee>();
   repository.findAll().forEach(employee -> employees.add(employee));
   return employees;
}

员工服务

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(){
      List<Employee> employees = new ArrayList<Employee>();
      repository.findAll().forEach(employee -> employees.add(employee));
      return employees;
   }
   public void saveOrUpdate(Employee employee) {
      repository.save(employee);
   }
   public void deleteEmployeeById(int id) {
   }
}

更新控制器

// Use service.getAllEmployees() to get a list of employees from database
@GetMapping("/employees")
public List<Employee> getAllEmployees(){
   return employeeService.getAllEmployees();
}

员工控制器

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 employeeService.getAllEmployees();
   }
   @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) {
   }	
}

运行应用程序

在 eclipse 中，运行应用程序设置期间准备的员工应用程序配置

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，首先使用 Postman 发出 POST 请求来添加记录。

在 POSTMAN 中设置以下参数。

• HTTP 方法 - POST

• URL - http://localhost:8080/emp/employee

• BODY -员工 JSON

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

单击发送按钮并检查响应状态是否正常。现在发出 GET 请求来获取所有记录。

在 POSTMAN 中设置以下参数。

• HTTP 方法 - GET

• URL - http://localhost:8080/emp/employees

单击发送按钮并验证响应。

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