用java 写一个图书管理系统，能够实现输入输出流和ui 界面

好的，我可以给您提供一个简单的图书管理系统的Java代码，包括输入输出流和UI界面。这个系统可以实现添加、删除、查找图书等基本功能。

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

public class BookManagementSystem extends JFrame implements ActionListener {

    private JTextField tfTitle, tfAuthor, tfPublisher, tfYear, tfSearch;
    private JTextArea taDisplay;
    private JButton btnAdd, btnDelete, btnSearch, btnClear;
    private JPanel panel, panelInput, panelDisplay;
    private BufferedReader br;
    private BufferedWriter bw;

    public BookManagementSystem() {
        //设置窗口标题和大小
        setTitle("图书管理系统");
        setSize(600, 400);

        //创建输入输出流
        try {
            br = new BufferedReader(new FileReader("books.txt"));
            bw = new BufferedWriter(new FileWriter("books.txt", true));
        } catch (IOException e) {
            e.printStackTrace();
        }

        //创建输入面板
        panelInput = new JPanel();
        panelInput.setLayout(new GridLayout(5, 2));
        panelInput.add(new JLabel("书名:"));
        tfTitle = new JTextField();
        panelInput.add(tfTitle);
        panelInput.add(new JLabel("作者:"));
        tfAuthor = new JTextField();
        panelInput.add(tfAuthor);
        panelInput.add(new JLabel("出版社:"));
        tfPublisher = new JTextField();
        panelInput.add(tfPublisher);
        panelInput.add(new JLabel("出版年份:"));
        tfYear = new JTextField();
        panelInput.add(tfYear);
        btnAdd = new JButton("添加");
        btnAdd.addActionListener(this);
        panelInput.add(btnAdd);
        btnDelete = new JButton("删除");
        btnDelete.addActionListener(this);
        panelInput.add(btnDelete);

        //创建显示面板
        panelDisplay = new JPanel();
        panelDisplay.setLayout(new BorderLayout());
        taDisplay = new JTextArea();
        panelDisplay.add(new JScrollPane(taDisplay));
        panelDisplay.setBorder(BorderFactory.createTitledBorder("图书列表"));

        //创建搜索面板
        JPanel panelSearch = new JPanel();
        tfSearch = new JTextField(10);
        btnSearch = new JButton("搜索");
        btnSearch.addActionListener(this);
        btnClear = new JButton("清空");
        btnClear.addActionListener(this);
        panelSearch.add(new JLabel("输入书名:"));
        panelSearch.add(tfSearch);
        panelSearch.add(btnSearch);
        panelSearch.add(btnClear);

        //创建主面板
        panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.add(panelInput, BorderLayout.NORTH);
        panel.add(panelDisplay, BorderLayout.CENTER);
        panel.add(panelSearch, BorderLayout.SOUTH);

        //将主面板添加到窗口中
        add(panel);

        //读取文件并显示
        try {
            String line;
            while ((line = br.readLine()) != null) {
                taDisplay.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //按钮点击事件处理
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnAdd) {
            String title = tfTitle.getText();
            String author = tfAuthor.getText();
            String publisher = tfPublisher.getText();
            String year = tfYear.getText();
            String book = title + "," + author + "," + publisher + "," + year;
            try {
                bw.write(book);
                bw.newLine();
                bw.flush();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            taDisplay.append(book + "\n");
        } else if (e.getSource() == btnDelete) {
            String title = tfTitle.getText();
            String line;
            try {
                File file = new File("books.txt");
                BufferedReader br = new BufferedReader(new FileReader(file));
                StringBuffer sb = new StringBuffer("");
                while ((line = br.readLine()) != null) {
                    if (line.indexOf(title) == -1) {
                        sb.append(line);
                        sb.append("\r\n");
                    }
                }
                br.close();
                FileWriter fw = new FileWriter(file);
                fw.write(sb.toString());
                fw.close();
                JOptionPane.showMessageDialog(null, "删除成功！");
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == btnSearch) {
            String title = tfSearch.getText();
            taDisplay.setText("");
            try {
                String line;
                while ((line = br.readLine()) != null) {
                    if (line.indexOf(title) != -1) {
                        taDisplay.append(line + "\n");
                    }
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == btnClear) {
            tfSearch.setText("");
            taDisplay.setText("");
            try {
                String line;
                br = new BufferedReader(new FileReader("books.txt"));
                while ((line = br.readLine()) != null) {
                    taDisplay.append(line + "\n");
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        BookManagementSystem frame = new BookManagementSystem();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

此代码实现了基本的图书管理系统的功能，包括添加、删除、查找和清空等操作。它使用了输入输出流读写文件，并使用了Java Swing库创建了一个简单的UI界面。请注意，此代码仅作为参考，实际项目中可能需要更多的功能和更复杂的实现方式。