我正在开发一个小型库应用程序，它能够保存存储在文本文件中的手册，并将所述文本文件加载回来。但是目前我无法将库存储在数组中，因为一旦用户加载文件，它们就会在控制台区域中显示文本。
如何将加载的library.txt文件存储在库中而不是打印到控制台？
这是我的手动课，其中包含保存实现：
import java.io.*;
import java.util.Scanner;
public class Manual {
String serial;
String title;
String author;
String publicationYear;
String status;
String borrower;
String borrowDate;
String returnDate;
Scanner userInput = new Scanner(System.in);
/**
* Display the Manual:
* @return ManualInfo
*/
final String displayManual(){
String ManualInfo ="\nSerial Number: ........... "+serial+
"\nTitle: ................... "+title+
"\nAuthor: .................. "+author+
"\nPublication Year: ........ "+publicationYear+
"\nStatus: .................. "+status+
"\nBorrower: ................ "+borrower+
"\nDate Borrowed: ........... "+borrowDate+
"\nReturn date: ............. "+returnDate+
"\n";
return ManualInfo;
}
/**
* Creates the Manual.
*/
final void createManual(){
serial = Console.readString(Messages.enterSerialMessage, Messages.tooShortMessage, 3);
title = Console.readString(Messages.enterTitleMessage, Messages.tooShortMessage, 2);
author = Console.readString(Messages.enterAuthorMessage, Messages.tooShortMessage, 3);
publicationYear = Console.readString(Messages.enterPublicationYearMessage, Messages.tooShortMessage, 4);
borrower = "N/A";
borrowDate = "N/A";
returnDate = "N/A";
status = "Available";
}
/***
* Runs the main part of the program and terminates if the choice is 0.
*/
public void run(){
User.addUser();
Menu.displayMenu();//Displays the main menu and ask for choice.
exit:
while(Menu.menuChoice != 0){
if(Menu.menuChoice == 1 && Library.ManualList.size() > 0){
Library.displayManualList();
boolean saveYesNo = Console.readYesNo("The 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){
try {
FileWriter fw = new FileWriter("Library.txt");
PrintWriter pw = new PrintWriter(fw);
for (int i1 = 0; i1 < Library.ManualList.size(); i1++){
pw.println("-------------------- Index Number: " + i1 + " --------------------");
pw.println(Library.ManualList.get(i1).displayManual());
pw.println("---------------------------------------------------------\n");
}
pw.close();
} catch (IOException e) {
System.out.println("Error! Library unable to save.");
}
System.out.println("\n\n--------------------------------------------------------------------------");
System.out.println("\n Library saved!\n");
System.out.println("--------------------------------------------------------------------------\n");
}
else if(saveYesNo){
System.out.println("\n");
}
Menu.displayMenu();
}
if(Menu.menuChoice == 1 && Library.ManualList.isEmpty()){
System.out.println(Messages.addManualFirst);
Menu.displayMenu();
}
if(Menu.menuChoice == 1 && Library.ManualList.size() > 0){
Library.displayManualList();
boolean saveYesNo = Console.readYesNo("The 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){
try {
FileWriter fw = new FileWriter("Library.txt");
PrintWriter pw = new PrintWriter(fw);
for (int i1 = 0; i1 < Library.ManualList.size(); i1++){
pw.println("-------------------- Index Number: " + i1 + " --------------------");
pw.println(Library.ManualList.get(i1).displayManual());
pw.println("---------------------------------------------------------\n");
}
pw.close();
} catch (IOException e) {
System.out.println("Error! Library unable to save.");
}
System.out.println("\n\n--------------------------------------------------------------------------");
System.out.println("\n Library saved!\n");
System.out.println("--------------------------------------------------------------------------\n");
}
else if(saveYesNo){
System.out.println("\n");
}
Menu.displayMenu();
}
if(Menu.menuChoice == 1 && Library.ManualList.isEmpty()){
System.out.println(Messages.addManualFirst);
Menu.displayMenu();
}
这是我的loadLibrary类，我的加载实现：
public class startLibrary {
/**
* The main method.
*
* @param args the arguments
*/
public static void main(String[] args){
System.out.println("\n--------------------------------------------------------------------------");
System.out.println("\n Welcome to the ManualKeeper® library app!");
System.out.println("\n--------------------------------------------------------------------------\n");
boolean loadYesNo = Console.readYesNo("The ManualKeeper® app is able to load any 'Library.txt' files found in \nyour workspace directory.\n\nWould you like to load a library? (Y/N):\n");
if(loadYesNo){
try {
FileReader fr = new FileReader("Library.txt");
BufferedReader br = new BufferedReader(fr);
String str;
while ((str = br.readLine()) != null) {
System.out.println(str + "\n");
}
br.close();
} catch (IOException e) {
System.out.println("Error! File not found");
}
}
Manual newManual = new Manual();
newManual.run();
}//End of Main Method.
这是我的图书馆课程所需的全部内容：
package library;
import java.util.ArrayList;
/** The Manual choice. */
public static int ManualChoice;
static String returnManualTitle;
/** The status1. */
static String status1 = "Available";
/** The status2. */
static String status2 = "Borrowed";
/** The Manual list. */
static ArrayList<Manual> ManualList = new ArrayList<Manual>();
static ArrayList<Manual> borrowedManuals = new ArrayList<Manual>();
/**
* Adds the Manual.
*/
static void addManual(){
Manual newManual = new Manual(); //create new Manual object with status "Available."
newManual.createManual();
ManualList.add(newManual);//add the Manual to the ManualList ArrayList.
System.out.println("\n\n--------------------------------------------------------------------------");
System.out.println("\n Manual added to library!\n");
System.out.println("--------------------------------------------------------------------------\n");
}
/**
* Display Manual list.
*/
static void displayManualList(){
if (ManualList.isEmpty()){//If the library is empty, it goes back to main menu and choice.
System.out.println("-------------------------------------------------------------");
System.out.println(Messages.empltyLibraryMessage + Messages.tryAgainMessage);
System.out.println("-------------------------------------------------------------");
Menu.menuChoice = 7;
} else {
System.out.printf("\n\nHere are the Manual/s currently stored in the library:\n\n\n");
for (int i = 0; i < ManualList.size(); i++){
System.out.printf("-------------------- Index Number: %s --------------------\n",i);
System.out.println(ManualList.get(i).displayManual());
System.out.println("---------------------------------------------------------\n");
}
}//End of For Loop.
}// End of Else Statement.
static void displayBorrowedManuals(){
if (ManualList.isEmpty()){//If the library is empty, it goes back to main menu and choice.
System.out.println("-------------------------------------------------------------");
System.out.println(Messages.empltyLibraryMessage + Messages.tryAgainMessage);
System.out.println("-------------------------------------------------------------");
Menu.menuChoice = 7;
} else {
for (int i = 0; i < borrowedManuals.size(); i++){
System.out.printf("-------------------- Index Number: %s --------------------\n",i);
System.out.println(borrowedManuals.get(i).displayManual());
System.out.println("---------------------------------------------------------");
}//End of For Loop.
}// End of Else Statement.
}//End of if Statement.
/**
* Borrow Manual.
*/
public static void borrowManual(){
//register user's Manual choice.
displayManualList();
ManualChoice = (Console.readInteger(Messages.enterManualIndexMessage, Messages.ManualIndexNotInListMessage, 0, Library.ManualList.size() - 1));
borrowLoop:
while(Menu.menuChoice == 3){
//Check if the Manual to be borrowed is available.
//ManualChoice = (Console.readInteger(Messages.enterManualIndexMessage, Messages.ManualIndexNotInListMessage, 1, Library.ManualList.size()));
if ((ManualList.get(ManualChoice).status.equalsIgnoreCase(status1)) && (ManualList.size() >= ManualChoice)){
//Print the borrowed Manual information and change the Manual status to borrowed.
ManualList.get(ManualChoice).status = "Borrowed";
ManualList.get(ManualChoice).borrower = User.userName;
ManualList.get(ManualChoice).borrowDate = "Today.";
ManualList.get(ManualChoice).returnDate = "In two weeks.";
//Add the borrowed Manual to the borrowedManuals arraylist:
borrowedManuals.add(ManualList.get(ManualChoice));
System.out.println("\n--------------------------------------------------------------------------");
System.out.println("\n Manual borrowed!\n");
System.out.println("--------------------------------------------------------------------------\n");
break borrowLoop;
}else if(ManualList.get(ManualChoice).status.equalsIgnoreCase(status2) && ManualList.size() >= ManualChoice){
System.out.println("\n--------------------------------------------------------------------------");
System.out.println("\n "
+ " The Manual you wish to borrow is already on loan.");
System.out.println("\n--------------------------------------------------------------------------\n");
break borrowLoop;
}else if(ManualChoice > ManualList.size()-1){
System.out.println(Messages.noSuchManualMessage);
break borrowLoop;
}
if(ManualList.size() > 1){
displayManualList();
}
else if(ManualList.size() == 1){
ManualList.get(ManualChoice).status = "Borrowed";
ManualList.get(ManualChoice).borrower = User.userName;
ManualList.get(ManualChoice).borrowDate = "Today.";
ManualList.get(ManualChoice).returnDate = "In two weeks.";
borrowedManuals.add(ManualList.get(ManualChoice));
System.out.printf("\n\nOSCAR YOU SHOULD NOT BE SEEING THIS!!!!!!!\n\n %s\n\n", ManualList.get(ManualChoice).displayManual());
System.out.println("Please return the Manual within two weeks!\n");
displayManualList();
}
}
Menu.displayMenu();
}
/**
* Return Manual.
*/
static void returnManual(){
System.out.printf("\n\nHere are the Manual/s currently out on loan:\n\n");
if(borrowedManuals.size() > 0){
for (int i = 0; i < borrowedManuals.size(); i++)
System.out.println(borrowedManuals.get(i).displayManual());
returnManualTitle = Console.readString(Messages.enterManualSerial, Messages.tooShortMessage, 3);
}
int x = 0;
boolean serialExistance = false;
while (x < ManualList.size()){//Search for the Manual by title, if it exists change it's status,
//it's borrower and borrowDate.
if (ManualList.get(x).serial.equalsIgnoreCase(returnManualTitle)){
ManualList.get(x).status = "Available";
ManualList.get(x).borrower = "N/A";
ManualList.get(x).borrowDate = "N/A";
ManualList.get(x).returnDate = "N/A";
int p = 0;
while (p < borrowedManuals.size()) {
Manual borrowed = borrowedManuals.get(p); // guessing the name of this class
if (borrowed.serial.equalsIgnoreCase(returnManualTitle)) {
borrowedManuals.remove(p);
break;
}
p++;
}
System.out.println(Messages.successReturnMessage);
serialExistance = true;
break;//if a title is found, break out of the loop and display choice menu.
}
x = x+1;
}//end of while loop.
if(serialExistance == false){
boolean repeatReturnManual = Console.readYesNo("\n--------------------------------------------------------------------------" + "\n\nThe Manual with the title "+"\""+returnManualTitle +"\""+ " wasn't found!"
+"\n\nDo you want to try again? (Y/N):\n");
System.out.println("\n--------------------------------------------------------------------------");
if(repeatReturnManual){
returnManual();
}
}else if(serialExistance){
Menu.menuChoice = 7;
}
}
/**
* Removes the Manual.
*/
public static void removeManual(){
if(ManualList.size() >0){
displayManualList();
ManualChoice = Console.readInteger(Messages.enterRemoveManualIndex ,Messages.ManualIndexNotInListMessage, 0, ManualList.size());
int p = 0;
while (p < borrowedManuals.size()){//Search for the Manual by title, if it exists change it's status,
//it's borrower and borrowDate.
if (borrowedManuals.get(p).title.equalsIgnoreCase(returnManualTitle)){
borrowedManuals.remove(p);
}
}
ManualList.remove(ManualChoice);
System.out.print(Messages.successRemovedManualMessages);
Menu.menuChoice = 7;
}
}
/**
* Empty library.
*/
static void emptyLibrary(){
System.out.println("\n WARNING!");
System.out.println("\n You have chosen to delete all Manuals in the library.\n");
System.out.println("--------------------------------------------------------------------------");
boolean emptyLibraryChoice = Console.readYesNo("\nAre you sure you wish to destroy the library? (Y/N): \n");
System.out.println("\n--------------------------------------------------------------------------\n");
if(emptyLibraryChoice){
Library.ManualList.clear();
System.out.println(Messages.successEmptyLibraryMesssage);
System.out.println("--------------------------------------------------------------------------\n");
Menu.menuChoice = 7;
}
}
}
答案 0 :(得分：1)
我想你转发了这个问题。我认为这个问题得到了很好的回答。 我试着向你解释一下：
您将库另存为文本文件。您可以添加以下所有手册：
"-------------------- Index Number: " + i1 + " --------------------"
"\nSerial Number: ........... "+serial+
"\nTitle: ................... "+title+
"\nAuthor: .................. "+author+
"\nPublication Year: ........ "+publicationYear+
"\nStatus: .................. "+status+
"\nBorrower: ................ "+borrower+
"\nDate Borrowed: ........... "+borrowDate+
"\nReturn date: ............. "+returnDate+
"\n";
"---------------------------------------------------------\n"
现在你将许多这些写入library.txt文件。问题：你无法提取信息。解决方案是：PARSING。 这只是一个小代码，你必须适应它才能使它工作：
final String delimiterManuals = ";;;;;;;;";
final String delimiterValues = "::::::::";
//save file
for (int i1 = 0; i1 < Library.ManualList.size() - 1; i1++)
{
//here are all attributes
pw.print(Library.ManualList.get(i1).title));
pw.print(delimiterValues);
pw.print(Library.ManualList.get(i1).author));
pw.print(delimiterValues);
pw.print(Library.ManualList.get(i1).publicationYear));
pw.print(delimiterValues);
pw.print(Library.ManualList.get(i1).status));
pw.print(delimiterValues);
pw.print(Library.ManualList.get(i1).borrower));
pw.print(delimiterValues);
pw.print(Library.ManualList.get(i1).borrowDate));
pw.print(delimiterValues);
pw.print(Library.ManualList.get(i1).returnDate); //this is your last attribute
pw.print(delimiterManuals);
}
//WATCH: lastAttribute is just an example (because I don't want to write every attribute)
//last Manual has no delimiterManual at the end (end of file)
pw.print(Library.ManualList.get(Library.ManualList.size()-1).title));
pw.print(delimiterValues);
pw.print(Library.ManualList.get(Library.ManualList.size()-1).author));
pw.print(delimiterValues);
//other attributes of the manual...
pw.print(Library.ManualList.get(Library.ManualList.size()-1).lastAttribute);
ArrayList<String> a = new ArrayList<String>();
//load
FileReader fr = new FileReader("Library.txt");
BufferedReader br = new BufferedReader(fr);
String str;
while ((str = br.readLine()) != null)
{
a.add(str);
}
ArrayList<Manual> manuals = new ArrayList<Manual>()
for(int i = 0; i < a.size(); ++i)
{
//split into single manuals
String[] split1 = a.get(i).split(delimiterManuals);
for(int j = 0; j < split1.length; ++j)
{
//split into single values
String[] split2 = split1.split(delimiterValues);
//here you have all values of a manual in the order you saved them so:
Manual m = new Manual();
m.title = split[0]; // <-- please don't do this! create and use setter/getter (like m.setTitle(split[0]);
m.author = split[1]
// till all fields are filled up
manuals.add(m);
}
}
//now you have all manuals in the manuals ArrayList
请考虑一下，你真的必须调整代码。我只想给你一个大致的想法 如何解析。