201771010124 王海珍 《面向对象设计 java》第十五周实验总结
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第一部分 理论部分
? JAR文件? 应用程序首选项存储? Java Web Start
JAR文件：
1.Java程序的打包：程序编译完成后，程序员将.class文件压缩打包为.jar文件后，GUI界面程序就可以直接双击图标运行。
2.jar文件（Java归档）既可以包含类文件，也可包含诸如图像和声音这些其它类型的文件。
3.JAR文件是压缩的，它使用ZIP压缩格式。
jar命令 1 jar命令格式： jar {ctxui} [vfm0Me] [jar-file] [manifest-file] [entry-point] [-C dir] files ... 2 Jar命令选项（教材581页表13-1）： – -c 创建一个新的或者空的存档文件并加入文件。 – -C 暂时改变到指定的目录 – -e 在清单文件中创建一个条目 – -f 将JAR文件名指定为第二个命令行参数 – -i 为指定的JAR文件产生索引信息 – -m 将一个清单文件（manifest）添加到JAR文件中 – -M 不产生所有项的清单文件（manifest） – -t 列出存档内容的列表 – -u 更新已存在的JAR文件 – -v 生成详细的输出结果 – -x 解压存档中的命名的（或所有的〕文件 – -0 只存储方式，不用ZIP压缩格式
(1) 创建JAR文件 jar cf jar-file input-file(s) c---want to Create a JAR file. eg: 1) jar cf MenuTest.jar *.class *.gif f---want the output to go to a file rather than to stdout. 2) jar cvf MenuTest.jar *.class *.gif v---Produces verbose output to stdout. 3) jar cvf MenuTest.jar * *---create all contents in current directory. 4) jar cv0f MenuTest.jar * 0---don‘t want the JAR file to be compressed.
(2) 查看JAR文件 jar tf jar-file t---want to view the Table of contents of the JAR file. eg: 1) jar tvf MenuTest.jar v---Produces verbose output to stdout.
(3) 提取JAR文件 jar xf jar-file [archived-file(s)] x---want to extract files from the JAR archive. eg: 1) jar xf MenuTest.jar copy.gif(仅提取文件copy.gif) 2) jar xf MenuTest.jar alex/copy.gif(仅提取目录alex下的 文件copy.gif) 3) jar xf MenuTest.jar(提取该JAR中的所有文件或目录)
(4) 更新JAR文件 jar uf jar-file input-file(s) u---want to update an existing JAR file. eg: 1) jar uf MenuTest.jar copy.gif (5) 索引JAR文件 jar i jar-file i---index an existing JAR file. eg: 1) jar i MenuTest.jar
清单文件
? 每个JAR文件中包含一个用于描述归档特征的清单文件(manifest)。清单文件被命名为MANIFEST.MF，它位于JAR文件的一个特殊的META-INF子目录中。
? 最小的符合标准的清单文件是很简单的：Manifest-Version：1.0复杂的清单文件包含多个条目，这些条目被分成多个节。第一节被称为主节，作用于整个JAR文件。随后的条目用来指定已命名条目的属性，可以是文件、包或者URL。
? 清单文件的节与节之间用空行分开，最后一行必须以换行符结束。否则，清单文件将无法被正确地读取。
– 创建一个包含清单的JAR文件，应该运行：
jar cfm MyArchive.jar manifest.mf com/*.class
– 要更新一个已有JAR文件的清单，则需要将增加的部分
放置到一个文本文件中，运行如下命令：
jar ufm MyArchive.jar manifest-additions.mf
运行JAR文件
? 用户可以通过下面的命令来启动应用程序：
java –jar MyProgram.jar
? 窗口操作系统，可通过双击JAR文件图标来启动应用程序。
资源
? Java中，应用程序使用的类通常需要一些相关的数据文件，这些文件称为资源(Resource)。
–图像和声音文件。
–带有消息字符串和按钮标签的文本文件。
–二进制数据文件，如：描述地图布局的文件。
? 类加载器知道如何搜索类文件，直到在类路径、存档文件或Web服务器上找到为止。
? 利用资源机制对于非类文件也可以进行同样操作，具体步骤如下：
– 获得资源的Class对象。
– 如果资源是一个图像或声音文件，那么就需要调用getresource(filename)获得资源的URL位置，然后利用getImage或getAudioClip方法进行读取。
– 如果资源是文本或二进制文件，那么就可以使用getResouceAsStream方法读取文件中的数据。
? 资源文件可以与类文件放在同一个目录中，也可以将资源文件放在其它子目录中。具体有以下两种方式：
–相对资源名：如data/text/about.txt它会被解释为相对于加载这个资源的类所在的包。
–绝对资源名：如/corejava/title.txt ? ResourceTest.java程序演示了资源加载的过程。 ? 编译、创建JAR文件和执行这个程序的命令如下： – javac ResourceTest.java – jar cvfm ResourceTest.jar ResourceTest.mf *.class *.gif *.txt – java –jar ResourceTest.jar
1、实验目的与要求
(1) 掌握Java应用程序的打包操作；
(2) 了解应用程序存储配置信息的两种方法；
(3) 掌握基于JNLP协议的java Web Start应用程序的发布方法；
(5) 掌握Java GUI 编程技术。
1、实验目的与要求
(1) 掌握Java应用程序的打包操作；
(2) 了解应用程序存储配置信息的两种方法；
(3) 掌握基于JNLP协议的java Web Start应用程序的发布方法；
(5) 掌握Java GUI 编程技术。
2、实验内容和步骤
实验1： 导入第13章示例程序，测试程序并进行代码注释。
测试程序1
l 在elipse IDE中调试运行教材585页程序13-1，结合程序运行结果理解程序；
l 将所生成的JAR文件移到另外一个不同的目录中，再运行该归档文件，以便确认程序是从JAR文件中，而不是从当前目录中读取的资源。
l 掌握创建JAR文件的方法；
package resource;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
/**
* @version 1.41 2015-06-12
* @author Cay Horstmann
*/
public class ResourceTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new ResourceTestFrame();
frame.setTitle("ResourceTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
/**
* A frame that loads image and text resources.
*/
class ResourceTestFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 300;
public ResourceTestFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
URL aboutURL = getClass().getResource("about.gif");
Image img = new ImageIcon(aboutURL).getImage();
setIconImage(img);
JTextArea textArea = new JTextArea();
InputStream stream = getClass().getResourceAsStream("about.txt");
try (Scanner in = new Scanner(stream, "UTF-8"))
{
while (in.hasNext())
textArea.append(in.nextLine() + "
");
}
add(textArea);
}
}
测试程序2
l 在elipse IDE中调试运行教材583页-584程序13-2，结合程序运行结果理解程序；
l 了解Properties类中常用的方法；
package properties;
import java.awt.EventQueue;
import java.awt.event.*;
import java.io.*;
import java.util.Properties;
import javax.swing.*;
/**
* A program to test properties. The program remembers the frame position, size,
* and title.
* @version 1.01 2015-06-16
* @author Cay Horstmann
*/
public class PropertiesTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
PropertiesFrame frame = new PropertiesFrame();
frame.setVisible(true);
});
}
}
/**
* A frame that restores position and size from a properties file and updates
* the properties upon exit.
*/
class PropertiesFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 200;
private File propertiesFile;
private Properties settings;
public PropertiesFrame()
{
// get position, size, title from properties
String userDir = System.getProperty("user.home");
File propertiesDir = new File(userDir, ".corejava");
if (!propertiesDir.exists()) propertiesDir.mkdir();
propertiesFile = new File(propertiesDir, "program.properties");
Properties defaultSettings = new Properties();
defaultSettings.setProperty("left", "0");
defaultSettings.setProperty("top", "0");
defaultSettings.setProperty("width", "" + DEFAULT_WIDTH);
defaultSettings.setProperty("height", "" + DEFAULT_HEIGHT);
defaultSettings.setProperty("title", "");
settings = new Properties(defaultSettings);
if (propertiesFile.exists())
try (InputStream in = new FileInputStream(propertiesFile))
{
settings.load(in);
}
catch (IOException ex)
{
ex.printStackTrace();
}
int left = Integer.parseInt(settings.getProperty("left"));
int top = Integer.parseInt(settings.getProperty("top"));
int width = Integer.parseInt(settings.getProperty("width"));
int height = Integer.parseInt(settings.getProperty("height"));
setBounds(left, top, width, height);
// if no title given, ask user
String title = settings.getProperty("title");
if (title.equals(""))
title = JOptionPane.showInputDialog("Please supply a frame title:");
if (title == null) title = "";
setTitle(title);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent event)
{
settings.setProperty("left", "" + getX());
settings.setProperty("top", "" + getY());
settings.setProperty("width", "" + getWidth());
settings.setProperty("height", "" + getHeight());
settings.setProperty("title", getTitle());
try (OutputStream out = new FileOutputStream(propertiesFile))
{
settings.store(out, "Program Properties");
}
catch (IOException ex)
{
ex.printStackTrace();
}
System.exit(0);
}
});
}
}
测试程序3
l 在elipse IDE中调试运行教材593页-594程序13-3，结合程序运行结果理解程序；
l 了解Preferences类中常用的方法；
package preferences;
import java.awt.*;
import java.io.*;
import java.util.prefs.*;
import javax.swing.*;
import javax.swing.filechooser.*;
/**
* A program to test preference settings. The program remembers the frame
* position, size, and title.
* @version 1.03 2015-06-12
* @author Cay Horstmann
*/
public class PreferencesTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
PreferencesFrame frame = new PreferencesFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
/**
* A frame that restores position and size from user preferences and updates the
* preferences upon exit.
*/
class PreferencesFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 200;
private Preferences root = Preferences.userRoot();
private Preferences node = root.node("/com/horstmann/corejava");
public PreferencesFrame()
{
// get position, size, title from preferences
int left = node.getInt("left", 0);
int top = node.getInt("top", 0);
int width = node.getInt("width", DEFAULT_WIDTH);
int height = node.getInt("height", DEFAULT_HEIGHT);
setBounds(left, top, width, height);
// if no title given, ask user
String title = node.get("title", "");
if (title.equals(""))
title = JOptionPane.showInputDialog("Please supply a frame title:");
if (title == null) title = "";
setTitle(title);
// 设置显示XML文件的文件选择器
final JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
chooser.setFileFilter(new FileNameExtensionFilter("XML files", "xml"));
// 设置菜单
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu menu = new JMenu("File");
menuBar.add(menu);
JMenuItem exportItem = new JMenuItem("Export preferences");
menu.add(exportItem);
exportItem
.addActionListener(event -> {
if (chooser.showSaveDialog(PreferencesFrame.this) == JFileChooser.APPROVE_OPTION)
{
try
{
savePreferences();
OutputStream out = new FileOutputStream(chooser
.getSelectedFile());
node.exportSubtree(out);
out.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
JMenuItem importItem = new JMenuItem("Import preferences");
menu.add(importItem);
importItem
.addActionListener(event -> {
if (chooser.showOpenDialog(PreferencesFrame.this) == JFileChooser.APPROVE_OPTION)
{
try
{
InputStream in = new FileInputStream(chooser
.getSelectedFile());
Preferences.importPreferences(in);
in.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
JMenuItem exitItem = new JMenuItem("Exit");
menu.add(exitItem);
exitItem.addActionListener(event -> {
savePreferences();
System.exit(0);
});
}
public void savePreferences()
{
node.putInt("left", getX());
node.putInt("top", getY());
node.putInt("width", getWidth());
node.putInt("height", getHeight());
node.put("title", getTitle());
}
}
测试结果如下所示
测试程序4
l 在elipse IDE中调试运行教材619页-622程序13-6，结合程序运行结果理解程序；
l 掌握基于JNLP协议的java Web Start应用程序的发布方法
package webstart;
import java.awt.*;
import javax.swing.*;
/**
* A calculator with a calculation history that can be deployed as a Java Web Start application.
* @version 1.04 2015-06-12
* @author Cay Horstmann
*/
public class Calculator
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
CalculatorFrame frame = new CalculatorFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package webstart;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.MalformedURLException;
import java.net.URL;
import javax.jnlp.BasicService;
import javax.jnlp.FileContents;
import javax.jnlp.FileOpenService;
import javax.jnlp.FileSaveService;
import javax.jnlp.PersistenceService;
import javax.jnlp.ServiceManager;
import javax.jnlp.UnavailableServiceException;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
/**
* A frame with a calculator panel and a menu to load and save the calculator history.
*/
public class CalculatorFrame extends JFrame
{
private CalculatorPanel panel;
public CalculatorFrame()
{
setTitle();
panel = new CalculatorPanel();
add(panel);
JMenu fileMenu = new JMenu("File");
JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
setJMenuBar(menuBar);
JMenuItem openItem = fileMenu.add("Open");
openItem.addActionListener(event -> open());
JMenuItem saveItem = fileMenu.add("Save");
saveItem.addActionListener(event -> save());
pack();
}
/**
* Gets the title from the persistent store or asks the user for the title if there is no prior
* entry.
*/
public void setTitle()
{
try
{
String title = null;
BasicService basic = (BasicService) ServiceManager.lookup("javax.jnlp.BasicService");
URL codeBase = basic.getCodeBase();
PersistenceService service = (PersistenceService) ServiceManager
.lookup("javax.jnlp.PersistenceService");
URL key = new URL(codeBase, "title");
try
{
FileContents contents = service.get(key);
InputStream in = contents.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
title = reader.readLine();
}
catch (FileNotFoundException e)
{
title = JOptionPane.showInputDialog("Please supply a frame title:");
if (title == null) return;
service.create(key, 100);
FileContents contents = service.get(key);
OutputStream out = contents.getOutputStream(true);
PrintStream printOut = new PrintStream(out);
printOut.print(title);
}
setTitle(title);
}
catch (UnavailableServiceException | IOException e)
{
JOptionPane.showMessageDialog(this, e);
}
}
/**
* Opens a history file and updates the display.
*/
public void open()
{
try
{
FileOpenService service = (FileOpenService) ServiceManager
.lookup("javax.jnlp.FileOpenService");
FileContents contents = service.openFileDialog(".", new String[] { "txt" });
JOptionPane.showMessageDialog(this, contents.getName());
if (contents != null)
{
InputStream in = contents.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String line;
while ((line = reader.readLine()) != null)
{
panel.append(line);
panel.append("
");
}
}
}
catch (UnavailableServiceException e)
{
JOptionPane.showMessageDialog(this, e);
}
catch (IOException e)
{
JOptionPane.showMessageDialog(this, e);
}
}
/**
* Saves the calculator history to a file.
*/
public void save()
{
try
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
PrintStream printOut = new PrintStream(out);
printOut.print(panel.getText());
InputStream data = new ByteArrayInputStream(out.toByteArray());
FileSaveService service = (FileSaveService) ServiceManager
.lookup("javax.jnlp.FileSaveService");
service.saveFileDialog(".", new String[] { "txt" }, data, "calc.txt");
}
catch (UnavailableServiceException e)
{
JOptionPane.showMessageDialog(this, e);
}
catch (IOException e)
{
JOptionPane.showMessageDialog(this, e);
}
}
}
package webstart;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
/**
A panel with calculator buttons and a result display.
*/
public class CalculatorPanel extends JPanel
{
private JTextArea display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
/**
Lays out the panel.
*/
public CalculatorPanel()
{
setLayout(new BorderLayout());
result = 0;
lastCommand = "=";
start = true;
// add the display
display = new JTextArea(10, 20);
add(new JScrollPane(display), BorderLayout.NORTH);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
// add the buttons in a 4 x 4 grid
panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));
addButton("7", insert);
addButton("8", insert);
addButton("9", insert);
addButton("/", command);
addButton("4", insert);
addButton("5", insert);
addButton("6", insert);
addButton("*", command);
addButton("1", insert);
addButton("2", insert);
addButton("3", insert);
addButton("-", command);
addButton("0", insert);
addButton(".", insert);
addButton("=", command);
addButton("+", command);
add(panel, BorderLayout.CENTER);
}
/**
Gets the history text.
@return the calculator history
*/
public String getText()
{
return display.getText();
}
/**
Appends a string to the history text.
@param s the string to append
*/
public void append(String s)
{
display.append(s);
}
/**
Adds a button to the center panel.
@param label the button label
@param listener the button listener
*/
private void addButton(String label, ActionListener listener)
{
JButton button = new JButton(label);
button.addActionListener(listener);
panel.add(button);
}
/**
This action inserts the button action string to the
end of the display text.
*/
private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String input = event.getActionCommand();
start = false;
display.append(input);
}
}
/**
This action executes the command that the button
action string denotes.
*/
private class CommandAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String command = event.getActionCommand();
if (start)
{
if (command.equals("-"))
{
display.append(command);
start = false;
}
else
lastCommand = command;
}
else
{
try
{
int lines = display.getLineCount();
int lineStart = display.getLineStartOffset(lines - 1);
int lineEnd = display.getLineEndOffset(lines - 1);
String value = display.getText(lineStart, lineEnd - lineStart);
display.append(" ");
display.append(command);
calculate(Double.parseDouble(value));
if (command.equals("="))
display.append("
" + result);
lastCommand = command;
display.append("
");
start = true;
}
catch (BadLocationException e)
{
e.printStackTrace();
}
}
}
}
/**
Carries out the pending calculation.
@param x the value to be accumulated with the prior result.
*/
public void calculate(double x)
{
if (lastCommand.equals("+")) result += x;
else if (lastCommand.equals("-")) result -= x;
else if (lastCommand.equals("*")) result *= x;
else if (lastCommand.equals("/")) result /= x;
else if (lastCommand.equals("=")) result = x;
}
}
代码出现错误
实验2：GUI综合编程练习
按实验十四分组名单，组内讨论完成以下编程任务：
练习1：采用GUI界面设计以下程序，并进行部署与发布：
l 编制一个程序，将身份证号.txt 中的信息读入到内存中；
l 按姓名字典序输出人员信息；
l 查询最大年龄的人员信息；
l 查询最小年龄人员信息；
l 输入你的年龄，查询身份证号.txt中年龄与你最近人的姓名、身份证号、年龄、性别和出生地；
l 查询人员中是否有你的同乡。
l 输入身份证信息，查询所提供身份证号的人员信息，要求输入一个身份证数字时，查询界面就显示满足查询条件的查询结果，且随着输入的数字的增多，查询匹配的范围逐渐缩小。
package demo1;
import java.awt.*;
import javax.swing.*;
public class ButtonTest {
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
JFrame frame = new Main();
frame.setTitle("身份证");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package demo1;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Main extends JFrame {
private static ArrayList<Student> studentlist;
private static ArrayList<Student> list;
private JPanel panel;
private JPanel buttonPanel;
private static final int DEFAULT_WITH = 600;
private static final int DEFAULT_HEIGHT = 300;
public Main() {
studentlist = new ArrayList<>();
Scanner scanner = new Scanner(System.in);
File file = new File("C:\\Users\\ASUS\\Desktop\\身份证号.txt");
try {
FileInputStream fis = new FileInputStream(file);
BufferedReader in = new BufferedReader(new InputStreamReader(fis));
String temp = null;
while ((temp = in.readLine()) != null) {
Scanner linescanner = new Scanner(temp);
linescanner.useDelimiter(" ");
String name = linescanner.next();
String number = linescanner.next();
String sex = linescanner.next();
String age = linescanner.next();
String province = linescanner.nextLine();
Student student = new Student();
student.setName(name);
student.setnumber(number);
student.setsex(sex);
int a = Integer.parseInt(age);
student.setage(a);
student.setprovince(province);
studentlist.add(student);
}
} catch (FileNotFoundException e) {
System.out.println("学生信息文件找不到");
e.printStackTrace();
} catch (IOException e) {
System.out.println("学生信息文件读取错误");
e.printStackTrace();
}
panel = new JPanel();
panel.setLayout(new BorderLayout());
JTextArea jt = new JTextArea();
panel.add(jt);
add(panel, BorderLayout.NORTH);
buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(1, 7));
JButton jButton = new JButton("字典排序");
JButton jButton1 = new JButton("年龄最大和年龄最小");
JLabel lab = new JLabel("猜猜你的老乡");
JTextField jt1 = new JTextField();
JLabel lab1 = new JLabel("找找同龄人（年龄相近）：");
JTextField jt2 = new JTextField();
JLabel lab2 = new JLabel("输入你的身份证号码：");
JTextField jt3 = new JTextField();
JButton jButton2 = new JButton("退出");
jButton.setBounds(110, 90, 60, 30);
jButton1.setBounds(110, 90, 60, 30);
jt1.setBounds(110, 90, 60, 30);
jt2.setBounds(110, 90, 60, 30);
jt3.setBounds(110, 90, 60, 30);
jButton2.setBounds(110, 90, 60, 30);
jButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Collections.sort(studentlist);
jt.setText(studentlist.toString());
}
});
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int max = 0, min = 100;
int j, k1 = 0, k2 = 0;
for (int i = 1; i < studentlist.size(); i++) {
j = studentlist.get(i).getage();
if (j > max) {
max = j;
k1 = i;
}
if (j < min) {
min = j;
k2 = i;
}
}
jt.setText("年龄最大：" + studentlist.get(k1) + "年龄最小：" + studentlist.get(k2));
}
});
jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
System.exit(0);
}
});
jt1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String find = jt1.getText();
String text="";
String place = find.substring(0, 3);
for (int i = 0; i < studentlist.size(); i++) {
if (studentlist.get(i).getprovince().substring(1, 4).equals(place)) {
text+="
"+studentlist.get(i);
jt.setText("老乡：" + text);
}
}
}
});
jt2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String yourage = jt2.getText();
int a = Integer.parseInt(yourage);
int near = agenear(a);
int value = a - studentlist.get(near).getage();
jt.setText("年龄相近：" + studentlist.get(near));
}
});
jt3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
list = new ArrayList<>();
Collections.sort(studentlist);
String key = jt3.getText();
for (int i = 1; i < studentlist.size(); i++) {
if (studentlist.get(i).getnumber().contains(key)) {
list.add(studentlist.get(i));
jt.setText("emmm！你可能是：
" + list);
//System.out.println("可能的人：" + studentlist.get(i));
//jt.setText("可能的人：" + studentlist.get(i));
}
}
}
});
buttonPanel.add(jButton);
buttonPanel.add(jButton1);
buttonPanel.add(lab);
buttonPanel.add(jt1);
buttonPanel.add(lab1);
buttonPanel.add(jt2);
buttonPanel.add(lab2);
buttonPanel.add(jt3);
buttonPanel.add(jButton2);
add(buttonPanel, BorderLayout.SOUTH);
setSize(DEFAULT_WITH, DEFAULT_HEIGHT);
}
public static int agenear(int age) {
int min = 53, value = 0, k = 0;
for (int i = 0; i < studentlist.size(); i++) {
value = studentlist.get(i).getage() - age;
if (value < 0)
value = -value;
if (value < min) {
min = value;
k = i;
}
}
return k;
}
}
package demo1;
public class Student implements Comparable<Student> {
private String name;
private String number ;
private String sex ;
private int age;
private String province;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getnumber() {
return number;
}
public void setnumber(String number) {
this.number = number;
}
public String getsex() {
return sex ;
}
public void setsex(String sex ) {
this.sex =sex ;
}
public int getage() {
return age;
}
public void setage(int age) {
// int a = Integer.parseInt(age);
this.age= age;
}
public String getprovince() {
return province;
}
public void setprovince(String province) {
this.province=province ;
}
public int compareTo(Student o) {
return this.name.compareTo(o.getName());
}
public String toString() {
return name+" "+sex+" "+age+" "+number+" "+province+"
";
}
}
运行结果：
字典排序：
1.查询最大年龄的人员信息；
2.查询最小年龄人员信息；
找老乡：
年龄相近的人：
输入身份证信息，查询所提供身份证号的人员信息，要求输入一个身份证数字时，查询界面就显示满足查询条件的查询结果，且随着输入的数字的增多，查询匹配的范围逐渐缩小。
输入数字2时：
输入数字26时：
输入数字265时：
练习2：采用GUI界面设计以下程序，并进行部署与发布
l 编写一个计算器类，可以完成加、减、乘、除的操作
l 利用计算机类，设计一个小学生100以内数的四则运算练习程序，由计算机随机产生10道加减乘除练习题，学生输入答案，由程序检查答案是否正确，每道题正确计10分，错误不计分，10道题测试结束后给出测试总分；
l 将程序中测试练习题及学生答题结果输出到文件，文件名为test.txt。
package ui_test;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.*;
public class MyExGUI extends JFrame {
ArrayList<String> user_zongti = new ArrayList<String>();
ArrayList<String> user_zonganswer = new ArrayList<String>();
ArrayList<String> user_answer = new ArrayList<String>();
ArrayList<String> true_answer = new ArrayList<String>();
ArrayList<String> jta_timu = new ArrayList<String>();
ArrayList<String> jta_zong = new ArrayList<String>();
ArrayList<Integer> user_fenshu = new ArrayList<Integer>();
JMenuBar jm; // 菜单条组件
JMenu menu;// 菜单
JMenuItem item1, item2;// 菜单项
JMenu build; // 二级菜单
JMenuItem file, project;
TextArea answer_all = new TextArea();
TextField jta = new TextField();
TextField jta_answer = new TextField();
JLabel num_answer = new JLabel();
JLabel answer;
JToolBar jtb;// 工具条
JButton jb1, jb2, jb3, jb4, jb5, jb6, jb7, jb_next;
int answer_count;
int answer_fenshu;
public MyExGUI() {
// 创建菜单
jm = new JMenuBar();
menu = new JMenu("文件(F)");
menu.setMnemonic(‘f‘); // 助记符
build = new JMenu("新建");
file = new JMenuItem("文件");
project = new JMenuItem("答题");
item1 = new JMenuItem("保存(S)");
item2 = new JMenuItem("退出");
answer = new JLabel("第 1 题");
// 添加菜单项至菜单上
build.add(file);
build.add(project);
menu.add(build);
menu.add(item1);
menu.add(item2);
menu.addSeparator();
// 将菜单加入至菜单栏
jm.add(menu);
JPanel contentPanel = new JPanel();
contentPanel.setLayout(null);
JLabel daan = new JLabel("答案");
JLabel dengyu = new JLabel("=");
num_answer = answer;
num_answer.setFont(new Font("宋体", Font.BOLD, 22));
jb_next = new JButton("下一题");
jta.setFont(new Font("宋体", Font.BOLD, 22));
jta_answer.setFont(new Font("宋体", Font.BOLD, 22));
jb_next.setFont(new Font("宋体", Font.BOLD, 22));
daan.setFont(new Font("宋体", Font.BOLD, 22));
dengyu.setFont(new Font("宋体", Font.BOLD, 22));
contentPanel.add(num_answer);
contentPanel.add(daan);
contentPanel.add(dengyu);
contentPanel.add(jta);
contentPanel.add(jta_answer);
contentPanel.add(answer_all);
contentPanel.add(jb_next);
num_answer.setBounds(90, 20, 130, 50);
daan.setBounds(250, 20, 90, 50);
jta.setBounds(50, 70, 150, 30);
dengyu.setBounds(205, 70, 20, 20);
jta_answer.setBounds(230, 70, 100, 30);
jb_next.setBounds(350, 70, 110, 30);
answer_all.setBounds(50, 120, 400, 300);
this.setJMenuBar(jm); // 添加菜单栏，不能设定位置，会自动放在最上部
this.add(contentPanel);
this.setTitle("在线答题系统");
this.setSize(600, 500);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
item1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
FileOutputStream outSTr = null;
BufferedOutputStream Buff = null;
boolean flag = true;
File file;
// String test ;
do {
// test = "test"+count;
String inputValue = JOptionPane.showInputDialog("Please input file name");
file = new File(inputValue + "test.txt");
if (!file.exists()) {
// 创建文件
try {
flag = file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
flag = false;
} else {
JOptionPane.showMessageDialog(null, "该文件名已存在，请重新输入", "ERROR", JOptionPane.ERROR_MESSAGE);
flag = true;
}
} while (flag);
// 写入文件
String u_answer;
try {
outSTr = new FileOutputStream(file);
Buff = new BufferedOutputStream(outSTr);
System.out.println("选择是后执行的代码" + user_zongti.size() + user_answer.size());
for (int i = 0; i < user_zongti.size(); i++) {
try {
Buff.write(user_zongti.get(i).getBytes());
Buff.write(" ".getBytes());
u_answer = user_answer.get(i);
if (u_answer.equals(""))
u_answer = "没有作答";
Buff.write(u_answer.getBytes());
Buff.write("
".getBytes());
} catch (IOException e) {
e.printStackTrace();
i--;
}
}
Buff.flush();
Buff.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
outSTr.close();
} catch (IOException e) {
e.printStackTrace();
}
user_zongti.clear();
user_answer.clear();
}
});
project.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
arithmetic art = new arithmetic();
true_answer = art.list_answer;
jta_timu = art.list_timu;
jta_zong = art.list;
answer_count = 1;
answer_all.setText("");
for (int i = 0; i < art.list_timu.size(); i++) {
user_zongti.add(jta_zong.get(i));
answer_all.append(jta_timu.get(i));
answer_all.append("
");
}
num_answer.setText("第 " + answer_count + " 题");
jta.setText(jta_timu.get(answer_count - 1));
answer_count++;
}
});
jb_next.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String temp;
temp = jta_answer.getText();
if (jta.getText().equals("")) {
JOptionPane.showMessageDialog(null, "错误,请导入题库", "错误", JOptionPane.ERROR_MESSAGE);
return;
}
jta_answer.setText("");
if (answer_count <= 10) {
if (isInteger(temp)) {
user_answer.add(temp);
System.out.println("选择否后执行的代码" + temp + "user_size" + user_answer.size());
num_answer.setText("第 " + answer_count + " 题");
jta.setText(jta_timu.get(answer_count - 1));
answer_count++;
} else {
JOptionPane.showMessageDialog(