Question

面向流的编程和对象序列化--------- 我们的java实验，求好心人帮我做一下。

实验目的：

1、掌握Java流的工作方式；

2、掌握常用输入和输出流的使用；

3、掌握文件的访问、目录和文件管理类的使用

实验内容：

1、编写程序实现以下功能：
（1）提示用户输入文件要存储的路径（例如c:\test）
（2）检查用户指定的路径中的文件夹是否存在，如果不存在，则创建这个文件夹
（3）提示用户输入文件名称
（4）检查步骤（1）的文件夹是否存在此文件名的文件，如果存在，则提示用户文件已经存在，要求用户重新输入，返回步骤（3）
（5）提示用户分别录入图书名称，出版社，价格，数量，是否教材（boolean类型）等信息
（6）将用户录入的图书信息用文件流的方式写入到步骤（4）确定的文件中
（7）询问用户是否结束录入图书信息，如果用户输入n，则返回步骤（5），否则关闭文件
（8）从用户输入的文件中把用户输入的图书信息读取，逐行显示在屏幕上，并最后显示图书的个数

2、过程同上题，但是要求图书信息的写入和读取采用对象的方式，即ObjectOutputStream、ObjectInputStream（提示：需要定义图书信息类并实现序列化接口）

Answer 1

import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Test
{
static class Book implements Serializable {
String name, publisher;
double price;
int copy;
boolean isTextBook;
}

public static void main(String[] args) throws Exception
{
Scanner scanner = new Scanner(System.in);
File file = getFile(scanner, getDirectory(scanner));
List<Book> books = getBooks(scanner);

//1.
//saveWithFileStream(file, books);
//readWithFileStream(file);

//2.
saveWithSerializer(file, books);
readWithSerializer(file);
}

private static File getDirectory(Scanner scanner) {
System.out.println("Directory: ");
String input = scanner.next();
File dir = new File(input);
if (dir.exists() == false) {
dir.mkdirs();
}
return dir;
}

private static File getFile(Scanner scanner, File dir) throws IOException {
while (true) {
System.out.println("File: ");
String input = scanner.next();
if (dir.list(getFilenameFilter(input)).length == 0) {
File file = new File(dir, input);
file.createNewFile();
return file;
}

System.out.println("File already exists");
}
}

private static FilenameFilter getFilenameFilter(final String filename) {
return new FilenameFilter() {
public boolean accept(File dir, String name) {
return filename.equals(name);
}
};
}

private static List<Book> getBooks(Scanner scanner) {
List<Book> books = new ArrayList<Book>();
while (true) {
Book book = new Book();
System.out.println("Name:");
book.name = scanner.next();
System.out.println("Publisher:");
book.publisher = scanner.next();
System.out.println("Price:");
book.price = scanner.nextDouble();
System.out.println("Copy:");
book.copy = scanner.nextInt();
System.out.println("Is TextBook:");
book.isTextBook = scanner.next().equals("y");
books.add(book);

System.out.println("Finish?");
if (scanner.next().equals("n") == false) {
return books;
}
}
}

private static void saveWithFileStream(File file, List<Book> books)
throws IOException {
FileWriter writer = new FileWriter(file);
for (Book book : books) {
writer.write(book.name + " ");
writer.write(book.publisher + " ");
writer.write(String.valueOf(book.price + " "));
writer.write(String.valueOf(book.copy + " "));
writer.write(String.valueOf(book.isTextBook + " "));
}
writer.close();
}

private static void readWithFileStream(File file) throws FileNotFoundException {
Scanner scanner = new Scanner(file);
int count = 0;
while (scanner.hasNext()) {
System.out.println("Name: " + scanner.next());
System.out.println("Publisher: " + scanner.next());
System.out.println("Price: " + scanner.next());
System.out.println("Copy: " + scanner.next());
System.out.println("Is TextBook: " + scanner.next());
System.out.println();
++count;
}

System.out.println("Total: " + count);
}

private static void saveWithSerializer(File file, List<Book> books)
throws IOException {
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream writer = new ObjectOutputStream(fos);
for (Book book : books) {
writer.writeObject(book);
}
writer.close();
}

private static void readWithSerializer(File file)
throws IOException, ClassNotFoundException {
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);

Object o;
int count = 0;
try {
while ((o = ois.readObject()) != null) {
Book book = (Book) o;
System.out.println("Name: " + book.name);
System.out.println("Publisher: " + book.publisher);
System.out.println("Price: " + book.price);
System.out.println("Copy: " + book.copy);
System.out.println("Is TextBook: " + book.isTextBook);
System.out.println();
++count;
}
} catch (EOFException ee) {}

System.out.println("Total: " + count);
}

}