pst and get

src/main/java/com/example/demo/Employee.java

@@ -5,6 +5,7 @@ public class Employee {
     private String lastname;
     private String position;
     private String department;
+    private String passportNumber;
     public String getName() { return name; }
     public void setName(String name) { this.name = name; }
     public String getLastname() { return lastname; }
@@ -16,4 +17,7 @@ public void setPosition(String position) { this.position =
     public String getDepartment() { return department; }
     public void setDepartment(String department) { this.department =
             department; }
+    public String getPassportNumber() { return passportNumber; }
+    public void setPassportNumber(String passportNumber) {
+        this.passportNumber = passportNumber; }
 }

src/main/java/com/example/demo/EmployeeController.java

@@ -1,20 +1,54 @@
 package com.example.demo;
-
+import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.springframework.web.bind.annotation.*;
 import java.io.File;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 @RestController
 @RequestMapping("/employee")
 public class EmployeeController {
+    private final File employeeFile = new File("employee.json");
+    private final ObjectMapper mapper = new ObjectMapper();
+    @GetMapping("/list")
+    public List<Employee> getAllEmployees() {
+        try {
+// Read and return the list of employees
+            if (employeeFile.exists()) {
+                return mapper.readValue(employeeFile, new
+                        TypeReference<List<Employee>>() {});
+            } else {
+                return new ArrayList<>(); // Return an empty list if no
+
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+            return new ArrayList<>(); // Return an empty list if there's
+
+        }
+    }
     @PostMapping("/add")
     public String addEmployee(@RequestBody Employee employee) {
         try {
-            ObjectMapper mapper = new ObjectMapper();
-            mapper.writeValue(new File("employee.json"), employee);
-            return "Employee data saved successfully!";
+            List<Employee> employees = new ArrayList<>();
+            if (employeeFile.exists()) {
+                employees = mapper.readValue(employeeFile, new
+                        TypeReference<List<Employee>>() {});
+            }
+            for (Employee existingEmployee : employees) {
+                if
+                (existingEmployee.getPassportNumber().equals(employee.getPassportNumber())) {
+                    return "Error: Duplicate passport number!";
+                }
+            }
+            employees.add(employee);
+            mapper.writeValue(employeeFile, employees);
+            return "Employee added successfully!";
         } catch (IOException e) {
             return "Error saving employee data: " + e.getMessage();
         }
-    }
-}
+
+    }}
+
+