IO流+数据库课后习题
1，读取 试题文件 然后做题算分
File file1=new File("D:\\file","test.txt"); try{ FileReader in1=new FileReader(file1); BufferedReader in2=new BufferedReader(in1); String s; int count=0; for(;(s=in2.readLine())!=null;){ if(!s.startsWith("-")){ System.out.println(s); } else{ System.out.print("input your answer: "); s=s.replaceAll("-",""); String daan; Scanner scanner1=new Scanner(System.in); daan=scanner1.next(); if(s.equals(daan)){ count++; } } } System.out.println("point "+count); } catch(Exception e){ System.out.println(e.getMessage()); }
2，用卡片布局做两个页面，来输入和输出
package testWin; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.*; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.JMenuBar; import javax.swing.JMenu; import javax.swing.JMenuItem; import java.awt.CardLayout; public class TestWin implements ActionListener { //使用卡片式布局，由菜单栏调用两个页面 private JFrame frame; File file1; JMenuItem input = new JMenuItem("input"); JMenuItem show = new JMenuItem("show"); InputArea inputMessage; CardLayout card; JPanel panel; JTextArea textArea; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { TestWin window = new TestWin(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the application. */ public TestWin() { initialize(); } /** * Initialize the contents of the frame. */ private void initialize() { file1=new File("D:\\file","test.txt"); frame = new JFrame(); frame.setBounds(100, 100, 450, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JMenuBar menuBar = new JMenuBar(); frame.setJMenuBar(menuBar); JMenu menu = new JMenu("\u83DC\u5355"); menuBar.add(menu); menu.add(input); menu.add(show); input.addActionListener(this); show.addActionListener(this); textArea=new JTextArea(12,50); inputMessage=new InputArea(file1); card=new CardLayout(); panel=new JPanel(); panel.setLayout(card); panel.add("input",inputMessage); panel.add("show",textArea); frame.add(panel); } @Override public void actionPerformed(ActionEvent e) { // TODO 自动生成的方法存根 if(e.getSource()==input){ card.show(panel, "input"); } else if(e.getSource()==show){ int number=1; textArea.setText(null); card.show(panel, "show"); try{ RandomAccessFile in=new RandomAccessFile(file1,"r"); String name=null; for(;(name=in.readUTF())!=null;){ textArea.append("\n"+"name :"+name); textArea.append("\t"+in.readUTF()); textArea.append("\t"+in.readUTF()); textArea.append("\n----------------------------------------------------------------------------"); number++; } in.close(); } catch(Exception e1){ System.out.println(e1.getMessage()); System.out.println("2222"); } } } }
package testWin; import javax.swing.JPanel; import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.*; import javax.swing.*; import javax.swing.BoxLayout; import javax.swing.JLabel; public class InputArea extends JPanel implements ActionListener{ /** * Create the panel. */ File file1; RandomAccessFile out1;//运用盒式布局，然后用随机流输入到文件 Box baseBox,box1,box2; JButton button1; private JLabel lblNewLabel; private JLabel lblNewLabel_1; private JLabel lblNewLabel_2; private JLabel lblNewLabel_3; private JTextField text1; private JTextField text2; private JTextField text3; private JButton button; public InputArea(File f) { setForeground(Color.CYAN); this.file1=f; baseBox=Box.createHorizontalBox(); box1=Box.createVerticalBox(); box2=Box.createVerticalBox(); baseBox.add(box1); lblNewLabel = new JLabel("\u8F93\u5165\u59D3\u540D"); box1.add(lblNewLabel); lblNewLabel_1 = new JLabel("\u8F93\u5165qq"); box1.add(lblNewLabel_1); lblNewLabel_2 = new JLabel("\u8F93\u5165\u7535\u8BDD"); box1.add(lblNewLabel_2); lblNewLabel_3 = new JLabel("\u5355\u51FB\u5F55\u5165"); box1.add(lblNewLabel_3); baseBox.add(box2); text1 = new JTextField(); box2.add(text1); text1.setColumns(10); text2 = new JTextField(); box2.add(text2); text2.setColumns(10); text3 = new JTextField(); box2.add(text3); text3.setColumns(10); button = new JButton("\u5F55\u5165"); box2.add(button); add(baseBox); button.addActionListener(this); } @Override public void actionPerformed(ActionEvent e) { // TODO 自动生成的方法存根 try{ RandomAccessFile out1=new RandomAccessFile(file1,"rw"); long length=file1.length(); out1.seek(length); out1.writeUTF("姓名 : "+text1.getText()); out1.writeUTF("qq : "+text2.getText()); out1.writeUTF("电话 : "+text3.getText()); out1.close(); text1.setText(null); text2.setText(null); text3.setText(null); } catch(Exception e1){ System.out.println(e1.getMessage()); } } }
3,编译器（编译可以，链接有bug
主类
package testWin; import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.*; import javax.swing.JButton; import javax.swing.JLabel; import javax.swing.JTextField; public class TestFrame extends JFrame implements ActionListener{ private JPanel contentPane; private JTextField text1; private JTextField text2; JButton button1 = new JButton("\u7528\u8BB0\u4E8B\u672C\u7F16\u8F91\u6E90\u6587\u4EF6"); JButton button2 = new JButton("\u7F16\u8BD1"); JButton button3 = new JButton("\u8FD0\u884C"); /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { TestFrame frame = new TestFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public TestFrame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 869, 111); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5)); contentPane.add(button1); JLabel label = new JLabel(" \u8F93\u5165\u6587\u4EF6\u540D \uFF1A"); contentPane.add(label); text1 = new JTextField(); contentPane.add(text1); text1.setColumns(15); contentPane.add(button2); JLabel label_1 = new JLabel(" \u8F93\u5165\u4E3B\u7C7B\u540D\uFF1A"); contentPane.add(label_1); text2 = new JTextField(); contentPane.add(text2); text2.setColumns(13); contentPane.add(button3); button1.addActionListener(this); button2.addActionListener(this); button3.addActionListener(this); } @Override public void actionPerformed(ActionEvent e) { // TODO 自动生成的方法存根 if(e.getSource()==button1){ System.out.println("dd"); Runtime ce=Runtime.getRuntime(); File file1=new File("D:\\javaWorkSpace\\Test\\src\\test22","test2.java"); // File file1=new File("D:\\file","test.java"); try{ ce.exec(file1.getAbsolutePath()); } catch(Exception e1){ System.out.println(e1.getMessage()); } } else if(e.getSource()==button2){ CompileDialog compileDialog=new CompileDialog(); String name=text1.getText(); compileDialog.compile(name); compileDialog.setVisible(true); } else if(e.getSource()==button3){ RunDialog runDialog=new RunDialog(); String name=text2.getText(); runDialog.run(name); runDialog.setVisible(true); } } }
编译类
package testWin; import java.awt.BorderLayout; import java.awt.FlowLayout; import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import javax.swing.JScrollPane; import javax.swing.JTextArea; public class CompileDialog extends JDialog { private final JPanel contentPanel = new JPanel(); JTextArea textArea = new JTextArea(14,70); /** * Launch the application. */ public static void main(String[] args) { try { CompileDialog dialog = new CompileDialog(); dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE); dialog.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } /** * Create the dialog. */ public CompileDialog() { setBounds(100, 100, 871, 502); getContentPane().setLayout(new BorderLayout()); contentPanel.setLayout(new FlowLayout()); contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5)); getContentPane().add(contentPanel, BorderLayout.CENTER); { JScrollPane scrollPane = new JScrollPane(); contentPanel.add(scrollPane); { scrollPane.setViewportView(textArea); } } { JPanel buttonPane = new JPanel(); buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT)); getContentPane().add(buttonPane, BorderLayout.SOUTH); { JButton okButton = new JButton("OK"); okButton.setActionCommand("OK"); buttonPane.add(okButton); getRootPane().setDefaultButton(okButton); } { JButton cancelButton = new JButton("Cancel"); cancelButton.setActionCommand("Cancel"); buttonPane.add(cancelButton); } } } public void compile(String name){ try{ Runtime ce=Runtime.getRuntime(); Process proccess =ce.exec("javac "+name); InputStream in1=proccess.getErrorStream(); BufferedInputStream in2=new BufferedInputStream(in1); int n; boolean bn=true; byte error[]=new byte[100]; for(;(n=in2.read(error,0,100))!=-1;){ String s=null; s=new String(error,0,n); textArea.append(s); if(s!=null)bn=false; } if(bn) textArea.append("编译正确"); } catch(IOException e2){ System.out.println(e2.getMessage()); } } }
运行类
package testWin; import java.awt.BorderLayout; import java.awt.FlowLayout; import java.io.BufferedInputStream; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import javax.swing.JScrollPane; import javax.swing.JTextArea; public class RunDialog extends JDialog { private final JPanel contentPanel = new JPanel(); JTextArea textArea = new JTextArea(14,20); /** * Launch the application. */ public static void main(String[] args) { try { RunDialog dialog = new RunDialog(); dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE); dialog.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } /** * Create the dialog. */ public RunDialog() { setBounds(100, 100, 686, 448); getContentPane().setLayout(new BorderLayout()); contentPanel.setLayout(new FlowLayout()); contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5)); getContentPane().add(contentPanel, BorderLayout.CENTER); { JScrollPane scrollPane = new JScrollPane(); contentPanel.add(scrollPane); { scrollPane.setViewportView(textArea); } } { JPanel buttonPane = new JPanel(); buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT)); getContentPane().add(buttonPane, BorderLayout.SOUTH); { JButton okButton = new JButton("OK"); okButton.setActionCommand("OK"); buttonPane.add(okButton); getRootPane().setDefaultButton(okButton); } { JButton cancelButton = new JButton("Cancel"); cancelButton.setActionCommand("Cancel"); buttonPane.add(cancelButton); } } } public void run(String name){ try{ Runtime ce1=Runtime.getRuntime(); Process proccess=ce1.exec("java "+name); InputStream in1=proccess.getInputStream(); BufferedInputStream in2=new BufferedInputStream(in1); byte a[]=new byte[100]; int n; for(;(n=in2.read(a,0,100))!=-1;){ String s=new String(a,0,n); textArea.append(s); if(s==null) System.out.println("333"); } System.out.println(n); System.out.println("444"); } catch(Exception e){ System.out.println(e.getMessage()); } } }
4,和第一个一样，读取数据库来答题，
import java.io.*; import java.util.Scanner; import java.sql.*; public class Test { public static void main(String args[]){ ReadTest test1=new ReadTest(); test1.setDatabase("Kooing"); test1.setTable("test"); int number=test1.getNumber(); System.out.println("There are "+number+" question what are you want to answer"); Scanner scanner1=new Scanner(System.in); for(;scanner1.hasNextInt();){ int num=scanner1.nextInt(); String huiche=scanner1.nextLine(); test1.setQusetion(num); String s=test1.getQusetion(); System.out.println(s); System.out.println("input your answer :"); String s2=scanner1.nextLine(); // String huiche=scanner1.nextLine(); if(s2.equals(test1.getAnswer().trim())){ System.out.println("right"); } else{ System.out.println("error"); } System.out.println("There are "+number+" question what are you want to answer"); } } } class ReadTest{ private Connection con; private Statement sql; private ResultSet rs; private String database,table,daan,wenti; private int question; ReadTest(){ try{ Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); } catch(Exception e){ System.out.println(e.getMessage()); System.out.println("1111"); } } void setDatabase(String a){ database=a; try{ con=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName="+database,"sa","kenn5666225"); } catch(Exception e2){ System.out.println(e2.getMessage()); System.out.println("2222222222"); } } void setTable(String a){ table=a; try{ sql=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); rs=sql.executeQuery("select *from "+table); } catch(Exception e3){ System.out.println(e3.getMessage()); System.out.println("33333333"); } } int getNumber(){ int n=0; try{ rs.last(); n=rs.getRow(); } catch(Exception e4){ System.out.println(e4.getMessage()); System.out.println("444444444"); } return n; } void setQusetion(int a){ question=a; } String getQusetion(){ try{ rs.absolute(question); wenti=rs.getString(1)+"\n"+rs.getString(2)+"\n"+rs.getString(3)+"\n"+rs.getString(4)+"\n"+rs.getString(5); } catch(Exception e5){ System.out.println(e5.getMessage()); System.out.println("55555555"); } return wenti; } String getAnswer(){ try{ daan=rs.getString(6); } catch(Exception e6){ System.out.println(e6.getMessage()); System.out.println("6666666666"); } return daan; } }
