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ResourceTest.java
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package Chapter10applicationAndApplet;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.LayoutManager;
import java.awt.ScrollPane;
import java.awt.event.ActionListener;
import java.beans.EventHandler;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
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.io.StringReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;
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.print.ServiceUIFactory;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
/*
* 生成可执行的jar文件
* 演示资源加载
*
*
* 生成可执行jar文件（必须要有资源清单*.mf）
* 资源文件基本：
* Manifest_Version: 1.0
* Main-Class: MainClassName(not add .class)
*
* 步骤：
* 1.编译Java文件：javac *.java
* 2.生成jar文件：jar cvfm jarFileName.jar File1 File2...
* 更新资源请清单：jar ufm jarFileName manifest-addition.mf
* .jar程序选项：Java核心技术P427
* */
public class ResourceTest extends JFrame{
private final static int DEFAULT_HERIGHT=500;
private final static int DEFAULT_WIDTH=300;
JScrollPane scrollPane=new JScrollPane();
JTextArea textArea= new JTextArea();
JTextArea editText=new JTextArea();
public static void main(String[] args) {
new ResourceTest();
}
//他的构造函数
public ResourceTest(){
this.setSize(DEFAULT_WIDTH, DEFAULT_HERIGHT);
this.setLayout(new BorderLayout());
scrollPane.add(textArea);
//设置fram的图标
//资源加载器
//得到"person.jpg"的资源位置（图像或声音）
URL url=this.getClass().getResource("person.jpg");
//用getImage()读取，声音用getAudioClip()
Image image=new ImageIcon(url).getImage();
setIconImage(image);
JMenuBar menuBar=new JMenuBar();
JMenu FileMenu=new JMenu("File");
JMenuItem OpenItem=FileMenu.add("Open");
JMenuItem CloseItem=FileMenu.add("Close");
JMenuItem SaveItem=FileMenu.add("Save");
//给open和close添加监听器
OpenItem.addActionListener(EventHandler.create(ActionListener.class, this, "open"));
SaveItem.addActionListener(EventHandler.create(ActionListener.class, this, "save"));
menuBar.add(FileMenu);
this.add(menuBar, BorderLayout.NORTH);
JPanel panel=new JPanel();
panel.setLayout(new GridLayout(2, 1));
panel.setSize(DEFAULT_WIDTH, 200);
textArea.setEditable(false);
textArea.setBackground(Color.LIGHT_GRAY);
textArea.setSize(DEFAULT_WIDTH, 50);
InputStream txtStream=getClass().getResourceAsStream("readme.txt");
Scanner in=new Scanner(txtStream);
while(in.hasNext()){
textArea.append(in.nextLine()+"\n");
}
editText.setBackground(Color.PINK);
editText.setSize(DEFAULT_WIDTH, 50);
editText.setText("请输入留言：");
panel.add(textArea);
panel.add(editText);
this.add(panel,BorderLayout.CENTER);
System.out.println(panel.getSize());
JTextArea welcome=new JTextArea();
welcome.setText("欢迎使用本系统！");
welcome.setEditable(false);
welcome.setBackground(Color.blue);
this.add(welcome,BorderLayout.SOUTH);
this.setTitle("resourceTest");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.pack();
}
public void setTitle(){
String title=null;
//需要javaws.jar文件
try {
//在浏览器默认显示文档
//使用BasicService接口访问服务
BasicService basic=(BasicService) ServiceManager
.lookup("javax.jnlp.BasicService");
//查看jnlp配置文件中的codeBase路径
URL codeBase= basic.getCodeBase();
System.out.println("codeBase:"+codeBase);
//PersistenceService允许应用程序保留少量的配置信息，并且在下次运行时恢复，类似cookie，使用URL键进行持久性存储：URL键可以存储任意的二进制数据
PersistenceService service=(PersistenceService) ServiceManager
.lookup("javax.jnlp.PersistenceService");
URL key=new URL(codeBase,"title");
try{
//访问与某个特定键关联的信息:无法知道这个键是否存在，只能通过“FileNotFoundException”异常
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;
//保证从第二次开始读取时，能通过持久性存储得到title的值
service.create(key, 100);
FileContents contents=service.get(key);
OutputStream out=contents.getOutputStream(true);
PrintStream printOut=new PrintStream(out);
printOut.print(title);
}
} catch (UnavailableServiceException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//打开文件
public void open(){
try {
//1.访问服务
FileOpenService service=(FileOpenService) ServiceManager.lookup("javax.jnlp.FileOpenService");
//2.openFileDialog接受应用程序提供的 初始路径名 和 文件拓展名
FileContents contents= service.openFileDialog(".", new String[]{"txt"});
//3.调用getInputStream和getOutputStream来读写文件
if(contents!=null){
InputStream input=contents.getInputStream();
Scanner in=new Scanner(input);
while(in.hasNext()){
//把它写到文本框中
textArea.append(in.nextLine()+"\n");
}
}
} catch (UnavailableServiceException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//保存文件
public void save(){
try {
FileSaveService service=(FileSaveService) ServiceManager
.lookup("javax.jnlp.FileSaveService");
//读取输入框中的string
ByteArrayInputStream input=new ByteArrayInputStream(editText.getText().getBytes());
//保存文件的弹框
service.saveFileDialog(".",new String[]{"txt"},input,"saveFile.txt");
} catch (UnavailableServiceException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}