Spring Boot Rest Web Service 在獲取請求中獲取多個參數

Question

我正在創建 Spring Boot Web 服務並且我有一個模范員工

public class Employee {
  private String id;
  private String name;
  private String designation;
  private int salary;
 //Has Getters and Setters
}

我想創建一個 Get 請求，它將根據用戶給定的參數獲取和過濾員工列表。

例如，如果用戶提供員工姓名和員工名稱，則 get 方法應過濾這些結果。 對於各種參數組合，它應該可以工作。

@Override
    public List<Employee> getEmployees(Map<String, Object> parameters) {
        if (parameters.size() == 0)
//          code to return all employees;
        List<Employee> selectedEmployees = new ArrayList<Employee>();
        for(Employee currentEmployee: new ArrayList<Employee>(employee.values())) {
            for(Map.Entry<String, Object> check: parameters.entrySet()) {
                try {
                    if(check.getValue() instanceof Integer) {
                        int condition = (int) Employee.class.getMethod("get" + check.getKey()).invoke(currentEmployee);
                        if((int) check.getValue() == condition)
                            selectedEmployees.add(currentEmployee);
                    } else if (check.getValue() instanceof String) {
                        String condition = (String) Employee.class.getMethod("get" + check.getKey()).invoke(currentEmployee);
                        if (((String) check.getValue()).equals(condition))
                            selectedEmployees.add(currentEmployee);
                    }
                } catch(Exception e){
                    e.printStackTrace();
                }
            }
        }
        return selectedEmployees; 
    }

為了避免多個 if else 情況，我根據上面的 String 和 Integer 過濾列表。

我想我在下面的代碼中犯了一個錯誤，它在控制器中發送請求。

@RequestMapping(value={"/employees","/{id}/{name}/{designation}/{salary}"})
    public List<Employee> getEmployeeByProperty(EmployeeRequestParameters requestParams){
        //Map for storing parameters to filter the List
        Map<String, Object> filterParams = new HashMap<>();
        if(requestParams.getIdParam().isEmpty()) {
            filterParams.put("id", Integer.parseInt(requestParams.getIdParam()));   
        } 
        if(!requestParams.getNameParam().isEmpty()) {
            filterParams.put("name", requestParams.getNameParam()); 
        } 
        if(!requestParams.getDesignationParam().isEmpty()) {
            filterParams.put("designation", requestParams.getDesignationParam());   
        } 
        if(requestParams.getSalaryParam().isEmpty()) {
            filterParams.put("salary", Integer.parseInt(requestParams.getSalaryParam()));   
        }       
        return EmployeeService.getEmployeesByProperty(filterParams);
    }

Answer 1

如果 {id} 字段未滿，則 {name} 或 {designation} 或 {salary} 為空。如果 {name} 或 {designation} 或 {salary} 已滿，因為應為 {id} 滿。

@GetMapping("/employees")
public List<Employee> getEmployeeByProperty(@RequestParam(value = "id", required=false) String id,
                                            @RequestParam(value = "name", required=false) String name,
                                            @RequestParam(value = "designation", required=false) String designation,
                                            @RequestParam(value = "salary", required=false) int salary) {
                                                //Your codes
                                            }

即使 {id} 為空，您也可以使用其他人。