基于Java的图书管理系统代码（包含UI代码）

package src; import java.io.*; import exception.*; public class Library implements Serializable{ private static String library = "CUIT_Library"; private static int booksAmount = 0; private static int studentsAmount = 0; private static Book [] books = new Book[160]; private static Student [] students = new Student[160]; private static FileOutputStream oips; public static void addBook (Book newBook){ try{ int index; File file = new File ("books.txt"); if (!file.exists ()) { file.createNewFile (); } FileInputStream fips = new FileInputStream (file); if (fips.read() == -1){ ObjectOutputStream objos=new ObjectOutputStream(new FileOutputStream (file, true)); objos.writeObject(newBook); objos.writeObject (new String ()); // 如果文件为空，写入String,作为下次判断读到文件尾标志 objos.close(); } else{ getBooks (); File file2 = new File ("books.txt"); // 将文件内容清空，以便重新写入 FileWriter fw = new FileWriter(file2); fw.write(""); fw.close(); for (index = 0; books[index] != null; ++ index); books[index] = newBook; // 新添加书籍作为末尾 booksAmount = index + 1; File file3 = new File ("books.txt"); // 关联文件 FileOutputStream f = new FileOutputStream (file3, true); // 创建文件输出流，以追加的方式写文件 ObjectOutputStream oips=new ObjectOutputStream(f); for (index = 0; books[index] != null; ++ index){ oips.writeObject(books[index]); } oips.writeObject (new String ()); // 写入null,作为下次判断读到文件尾标志 oips.close(); } } catch (FileNotFoundException e1){ System.out.println ("文件未找到"); e1.printStackTrace(); } catch (IOException e2){ System.out.println ("添加图书信息是I/O异常"); e2.printStackTrace(); } catch (Exception e3){ System.out.println ("未知错误"); e3.printStackTrace(); } } public static void deleteBook (String title){ int i; getBooks(); for (i = 0; books[i] != null; ++ i){ if (title.equalsIgnoreCase(books[i].getTitle())) break; } try{ if (books[i] == null) throw new CanNotSearchBookException(); if (books[i].getAmount() < books[i].getInitAmount()) // 如果还有书籍被读者借去，则不能删除书籍，避免造成数据混乱 throw new CanNotDeleteBookException (); for (int j = i; books[j] != null; ++ j){ books[j] = books[j + 1]; } Library.saveAllBooks(books); } catch (CanNotSearchBookException e1){ System.out.println("所删除图书不存在异常"); } catch (CanNotDeleteBookException e1){ System.out.println("不可删除图书异常，(由于有部分书籍借出未还)"); } } public static void saveAllBooks (Book [] newBooks){ try{ int index; File file = new File ("books.txt"); // 将文件内容清空，以便重新写入 FileWriter fw = new FileWriter(file); fw.write(""); fw.close(); FileOutputStream f = new FileOutputStream (file, true); // 创建文件输出流，以追加的方式写文件 ObjectOutputStream o=new ObjectOutputStream(f); for (index = 0; newBooks[index] != null; ++ index){ o.writeObject(newBooks[index]); } o.writeObject ((Book) null); // 写入null,作为下次判断读到文件尾标志 o.close(); } catch (FileNotFoundException e1){ System.out.println ("文件未找到"); e1.printStackTrace(); } catch (IOException e2){ System.out.println ("保存全部图书信息是I/O异常"); e2.printStackTrace(); } catch (Exception e3){ System.out.println ("未知错误"); e3.printStackTrace(); } } public static Book[] getBooks () { try{ int start = 0; booksAmount = 0; // 调用此方法前先将字段清空 Object a; for (int j = 0; j != books.length; ++ j){ // 防止多次调用此方法时数据错误 books[j] = null; } File file = new File ("books.txt"); // 关联文件 FileInputStream fips = new FileInputStream (file); // 打开文件，创建一个 FileInputStream ObjectInputStream oips = new ObjectInputStream(fips); while ((a = oips.readObject()) instanceof Book) { // 由之前写入的null，判断是否读到文件尾 books [start] = (Book) a; ++ start; } oips.close(); } catch (IOException e){ System.out.println ("获取图书信息是I/O异常"); e.printStackTrace(); } catch (Exception e2){ System.out.println ("未知错误"); e2.printStackTrace(); } return books; } public static void addStudent (Student newstudent){ try{ int index; File file = new File ("readers.txt"); if (!file.exists ()) { file.createNewFile (); } FileInputStream fips = new FileInputStream (file); if (fips.read() == -1){ ObjectOutputStream objos=new ObjectOutputStream(new FileOutputStream (file, true)); objos.writeObject(newstudent); objos.writeObject (new String ()); // 如果文件为空，写入String,作为下次判断读到文件尾标志 objos.close(); } else{ getStudents (); File file2 = new File ("readers.txt"); // 将文件内容清空，以便重新写入 FileWriter fw = new FileWriter(file2); fw.write(""); fw.close(); for (index = 0; students[index] != null; ++ index); students[index] = newstudent; // 新添加书籍作为末尾 studentsAmount = index + 1; File file3 = new File ("readers.txt"); // 关联文件 FileOutputStream f = new FileOutputStream (file3, true); // 创建文件输出流，以追加的方式写文件 ObjectOutputStream oips=new ObjectOutputStream(f); for (index = 0; students[index] != null; ++ index){ oips.writeObject(students[index]); } oips.writeObject (new String ()); // 写入null,作为下次判断读到文件尾标志 oips.close(); } } catch (FileNotFoundException e1){ System.out.println ("文件未找到"); e1.printStackTrace(); } catch (IOException e2){ System.out.println ("添加学生信息是I/O异常"); e2.printStackTrace(); } catch (Exception e3){ System.out.println ("未知错误"); e3.printStackTrace(); } } public static void deleteStudent (String number){ int i; getStudents(); for (i = 0; students[i] != null; ++ i){ if (number.equalsIgnoreCase(students[i].getStudentNum())) break; } try{ if (students[i] == null) throw new CanNotSearchStudentException(); if (students[i].getBorrowedBooks() != 0) // 如果还有书籍被读者借去，则不能删除书籍，避免造成数据混乱 throw new CanNotDeleteStudentException (); for (int j = i; students[j] != null; ++ j){ students[j] = students[j + 1]; } Library.saveAllStudents(students); } catch (CanNotSearchStudentException e1){ System.out.println("所删除学生不存在异常"); } catch (CanNotDeleteStudentException e1){ System.out.println("不可删除学生异常,(由于该学生有借出书为还)"); } } public static void saveAllStudents (Student [] newStudents){ try{ int index; File file = new File ("readers.txt"); // 将文件内容清空，以便重新写入 FileWriter fw = new FileWriter(file); fw.write(""); fw.close(); if (!file.exists ()) { file.createNewFile (); } FileOutputStream f = new FileOutputStream (file, true); // 创建文件输出流，以追加的方式写文件 ObjectOutputStream o=new ObjectOutputStream(f); for (index = 0; newStudents[index] != null; ++ index){ o.writeObject(newStudents[index]); } o.writeObject (new Book ()); // 写入null,作为下次判断读到文件尾标志 o.close(); } catch (FileNotFoundException e1){ System.out.println ("文件未找到"); e1.printStackTrace(); } catch (IOException e2){ System.out.println ("保存全部学生信息时I/O异常"); e2.printStackTrace(