124 lines
4.2 KiB
Java
124 lines
4.2 KiB
Java
package TodoListApp;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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// 待办事项管理类
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class TodoListManager {
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private final List<TodoItem> todoList;
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private int nextId;
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public TodoListManager() {
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todoList = new ArrayList<>();
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nextId = 1; // 起始编号
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}
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// 添加待办事项
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public void addTodo(String description) throws EmptyDescriptionException{ //同时声明可能抛出的异常类型
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if(description == null || description.trim().isEmpty()){
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EmptyDescriptionException e = new EmptyDescriptionException("待办事项的描述不能为空。");
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throw e;
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}
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try {
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string sql = "insert into todos (description) values('"+description+"')"
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system.out.println(sql);
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Statement stmt = conn.createStatement();
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stmt.executeUpdate(sql)
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}
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TodoItem item = new TodoItem(nextId++, description);
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todoList.add(item);
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System.out.println("待办事项已添加： " + item);
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}o
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// 列出所有待办事项
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public void listTodos() {
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if (todoList.isEmpty()) {
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System.out.println("当前没有待办事项。");
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return;
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}
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System.out.println("\n===== 待办事项列表 =====");
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for (TodoItem item : todoList) {
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System.out.println(item);
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}
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}
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// 删除指定编号的待办事项
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public void removeTodo(int id) throws TodoNotFoundException{
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boolean removed = false;
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for (TodoItem item : todoList) {
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if (item.getId() == id) {
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todoList.remove(item);
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System.out.println("已删除待办事项： " + item);
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removed = true;
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break;
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}
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}
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if (!removed) {
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throw new TodoNotFoundException("未找到编号为 " + id + " 的待办事项。");
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//System.out.println("未找到编号为 " + id + " 的待办事项。");
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}
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}
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public void markAsCompleted(int id) {
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TodoItem item = null;
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for (TodoItem todo : todoList) {
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if (todo.getId() == id) {
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item = todo;
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break;
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}
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}
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if (item != null) {
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if (!item.isCompleted()) {
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item.setCompleted(true);
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System.out.println("待办事项已标记为完成： " + item);
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} else {
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System.out.println("待办事项已完成，无需重复标记。");
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}
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}
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else {
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System.out.println("未找到编号为：" + id + " 的待办事项。");
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}
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}
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public void saveToFile(String filename){
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try {
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File file = new File(filename);
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FileOutputStream fos = new FileOutputStream(file);
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for (TodoItem item : todoList) {
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String line = item.getId() + ":" + item.getDescription() + "\n";
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fos.write(line.getBytes());
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}
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System.out.println("待办事项已经保存到文件：" + filename);
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fos.close();
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}
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catch (IOException e){
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System.out.println("待办事项保存失败：" + e.getMessage());
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}
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}
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private void backupToFile(String backupFilename) {
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LocalDateTime now = LocalDateTime.now();
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DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd_HH-mm-ss");
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String timestamp = now.format(formatter);
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String fullBackupFilename = backupFilename + "_" + timestamp + ".bak";
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try (FileOutputStream fos = new FileOutputStream(new File(fullBackupFilename))) {
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for (TodoItem item : todoList) {
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String line = item.getId() + ":" + item.getDescription() + ":" + (item.isCompleted() ? "完成" : "未完成") + "\n";
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fos.write(line.getBytes());
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}
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System.out.println("待办事项已备份到文件：" + fullBackupFilename);
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} catch (IOException e) {
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System.out.println("待办事项备份失败：" + e.getMessage());
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}
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}
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}
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