Java - 跨平台桌面(？)保存

Question

目前我有这个:

            if(Menu.menuChoice == 0){
                if(Menu.menuChoice == 0){
                    if(Library.ManualList.size() > 0){
                        boolean saveYesNo = Console.readYesNo("\nThe manualKeeper app is able to save your current library to a '.txt' \nfile in your workspace directory.\n\nWould you like to save the current library? (Y/N):\n");
                        if(saveYesNo==true){
                            try {
                                File file = new File("Library.txt");
                                System.getProperty("user.home");

                                file.createNewFile();
                                FileWriter fw = new FileWriter(file, true);
                                PrintWriter pw = new PrintWriter(fw);

                                for (int i = 0; i < Library.ManualList.size(); i++){
                                    pw.println("\n-------------------- Index Number: " + i + " --------------------");
                                    pw.println(Library.ManualList.get(i).displayManual());
                                    pw.println("---------------------------------------------------------");
                                }
                                pw.close();
                                System.out.println("\n\n--------------------------------------------------------------------------");
                                System.out.println("\n                              Library saved!\n");
                                System.out.println("--------------------------------------------------------------------------\n");
                                break exit;
                            } catch (IOException e) {
                                System.out.println("Error! Library unable to save.");
                            }

                        }
                            else if(saveYesNo==false){
                                System.out.println("\n\n--------------------------------------------------------------------------");
                                System.out.println("\n                              Library not saved!\n");
                                System.out.println("--------------------------------------------------------------------------\n");
                                break exit;
                        }
                        Menu.displayMenu();
                    }else if(Library.ManualList.isEmpty()){ 
                        Menu.displayMenu();
                    }
                }
            }   

它将文本文件保存在 Eclipse 的工作区目录中，类文件位于该目录中。但是，当我将此项目导出到“.jar”文件时，我希望将文本文件保存在与 jar 文件相同的目录中或保存在桌面上。我已经阅读过有关“User.home”的内容，但是由于我是编程新手，因此无法使其正常工作。有谁知道我怎样才能实现这个目标？

<小时/>

编辑

更新的代码:

            if(Menu.menuChoice == 0){
                if(Menu.menuChoice == 0){
                    if(Library.ManualList.size() > 0){
                        boolean saveYesNo = Console.readYesNo("\nThe manualKeeper app is able to save your current library to a '.txt' \nfile in your workspace directory.\n\nWould you like to save the current library? (Y/N):\n");
                        if(saveYesNo==true){
                            try {
                                String path = System.getProperty("user.dir") + File.separator + "Library.txt";
                                File file = new File(path);
                                file.createNewFile();
                                FileWriter fw = new FileWriter(file, true);
                                PrintWriter pw = new PrintWriter(fw);

                                for (int i = 0; i < Library.ManualList.size(); i++){
                                    pw.println("\n-------------------- Index Number: " + i + " --------------------");
                                    pw.println(Library.ManualList.get(i).displayManual());
                                    pw.println("---------------------------------------------------------");
                                }
                                pw.close();
                                System.out.println("\n\n--------------------------------------------------------------------------");
                                System.out.println("\n                              Library saved!\n");
                                System.out.println("--------------------------------------------------------------------------\n");
                                break exit;
                            } catch (IOException e) {
                                System.out.println("Error! Library unable to save.");
                            }

                        }
                            else if(saveYesNo==false){
                                System.out.println("\n\n--------------------------------------------------------------------------");
                                System.out.println("\n                              Library not saved!\n");
                                System.out.println("--------------------------------------------------------------------------\n");
                                break exit;
                        }
                        Menu.displayMenu();
                    }else if(Library.ManualList.isEmpty()){ 
                        Menu.displayMenu();
                    }
                }
            }   

Answer 1

下面的内容应该可以解决问题。

String path = System.getProperty("user.dir") + File.separator + "foo.txt";
File customfile = new File(path);

字符串路径 = System.getProperty("user.dir") + File.separator + "foo.txt";

获取用户当前所在目录

System.getProperty("user.dir")

然后使用

获取文件分隔符

文件.分隔符

最后命名要制作的文本文件

foo.txt。

之后，

文件自定义文件 = new File(路径);

使用您刚刚创建的 path 变量创建新文件，该变量保存文件的放置位置。