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UserDao.java
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153 lines (135 loc) · 4.16 KB
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package com.tutorialspoint;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;
public class UserDao {
public List<User> getAllUsers(){
List<User> userList = null;
try {
File file = new File("Users.dat");
if (!file.exists()) {
User user = new User(1, "Mahesh", "Teacher");
userList = new ArrayList<User>();
userList.add(user);
saveUserList(userList);
}
else{
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);
userList = (List<User>) ois.readObject();
ois.close();
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return userList;
}
private void saveUserList(List<User> userList){
try {
File file = new File("Users.dat");
FileOutputStream fos;
fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(userList);
oos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public User getUser(int id){
List<User> users = getAllUsers();
for(User user: users){
if(user.getId() == id){
return user;
}
}
return null;
}
public int addUser(User pUser){
List<User> userList = getAllUsers();
boolean userExists = false;
for(User user: userList){
if(user.getId() == pUser.getId()){
userExists = true;
break;
}
}
if(!userExists){
userList.add(pUser);
saveUserList(userList);
return 1;
}
return 0;
}
public int updateUser(User pUser){
List<User> userList = getAllUsers();
for(User user: userList){
if(user.getId() == pUser.getId()){
int index = userList.indexOf(user);
userList.set(index, pUser);
saveUserList(userList);
return 1;
}
}
return 0;
}
public int deleteUser(int id){
List<User> userList = getAllUsers();
for(User user: userList){
if(user.getId() == id){
int index = userList.indexOf(user);
userList.remove(index);
saveUserList(userList);
return 1;
}
}
return 0;
}
public List<UserJson> getAllUsersJson(){
List<UserJson> userList = null;
try {
File file = new File("Users1.dat");
if (!file.exists()) {
UserJson userJson = new UserJson(1, "Mahesh", "Teacher");
userList = new ArrayList<UserJson>();
userList.add(userJson);
saveUserListJson(userList);
}
else{
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);
userList = (List<UserJson>) ois.readObject();
ois.close();
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return userList;
}
private void saveUserListJson(List<UserJson> userList){
try {
File file = new File("Users1.dat");
FileOutputStream fos;
fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(userList);
oos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}