用Java 写一个图书馆里系统，能够实现基本功能和输入输出流实现数据的读写，和ui界面

好的，我可以给您提供一个简单的Java图书馆管理系统的代码示例，它包含了基本的功能和使用输入输出流实现数据的读写，还有简单的UI界面。代码如下：

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class LibrarySystem extends JFrame implements ActionListener {

    private JTextField bookNameField, authorField, numField;
    private JTextArea resultArea;
    private JButton addButton, queryButton, clearButton;

    public LibrarySystem() {
        super("图书馆管理系统");

        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());

        JPanel inputPanel = new JPanel(new GridLayout(4, 2));
        inputPanel.add(new JLabel("书名："));
        bookNameField = new JTextField();
        inputPanel.add(bookNameField);
        inputPanel.add(new JLabel("作者："));
        authorField = new JTextField();
        inputPanel.add(authorField);
        inputPanel.add(new JLabel("数量："));
        numField = new JTextField();
        inputPanel.add(numField);
        addButton = new JButton("添加");
        addButton.addActionListener(this);
        inputPanel.add(addButton);
        queryButton = new JButton("查询");
        queryButton.addActionListener(this);
        inputPanel.add(queryButton);
        clearButton = new JButton("清空");
        clearButton.addActionListener(this);
        inputPanel.add(clearButton);

        contentPane.add(inputPanel, BorderLayout.NORTH);

        resultArea = new JTextArea();
        contentPane.add(new JScrollPane(resultArea), BorderLayout.CENTER);

        setSize(400, 300);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new LibrarySystem();
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == addButton) {
            addBook();
        } else if (e.getSource() == queryButton) {
            queryBook();
        } else if (e.getSource() == clearButton) {
            clearInput();
        }
    }

    private void addBook() {
        String bookName = bookNameField.getText();
        String author = authorField.getText();
        String numStr = numField.getText();
        int num = Integer.parseInt(numStr);
        try {
            FileOutputStream fos = new FileOutputStream("books.txt", true);
            OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write(bookName + "," + author + "," + num);
            bw.newLine();
            bw.close();
            resultArea.append("添加成功！\n");
        } catch (Exception e) {
            resultArea.append("添加失败：" + e.getMessage() + "\n");
        }
    }

    private void queryBook() {
        String bookName = bookNameField.getText();
        try {
            FileInputStream fis = new FileInputStream("books.txt");
            InputStreamReader isr = new InputStreamReader(fis, "UTF-8");
            BufferedReader br = new BufferedReader(isr);
            String line;
            boolean found = false;
            while ((line = br.readLine()) != null) {
                String[] fields = line.split(",");
                if (fields[0].equals(bookName)) {
                    resultArea.append(line + "\n");
                    found = true;
                    break;
                }
            }
            br.close();
            if (!found) {
                resultArea.append("没有找到该书！\n");
            }
        } catch (Exception e) {
            resultArea.append("查询失败：" + e.getMessage() + "\n");
        }
    }

    private void clearInput() {
        bookNameField.setText("");
        authorField.setText("");
        numField.setText("");
        resultArea.setText("");
    }

}

这个代码示例包含了一个简单的UI界面，可以通过添加、查询和清空按钮实现基本的图书馆管理功能。数据使用输入输出流实现读写，保存在本地文件中。注意，这个代码示例只是一个简单的演示，实际的图书馆管理系统需要更完善的功能和更健壮的代码。