关于Eclipse的文件路径

最近突然来劲，准备学点Java，其中一个示例程序用到了目录中的图片文件，可程序运行时，却没将图片显示出来，部分代码如下：

 

package ch09;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ToolBarTest {
  // omitted here ......


}
class ToolBarFrame extends JFrame{
  public ToolBarFrame(){
    // omitted here ......


    Action blueAction = new ColorAction("Blue",new ImageIcon("blue-ball.gif"),Color.BLUE);

    Action yellowAction = new ColorAction("Yellow",new ImageIcon("yellow-ball.gif"),Color.YELLOW);

    Action redAction = new ColorAction("Red",new ImageIcon("red-ball.gif"),Color.RED);

    Action exitAction = new AbstractAction("Exit",new ImageIcon("exit.gif")){

        public void actionPerformed(ActionEvent event){

            System.exit(0);

        }

    };

    // omitted here ......

  }
}

 

此时上述4个图片文件与程序源文件位于同一目录下，路径为：CoreJavaV1\src\ch09\*.*

 

最后发现程序中的路径是相对于工程目录而言的，也就是默认工作目录为：CoreJavaV1，通过修改上述程序如下，问题得到解决：

 

package ch09;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ToolBarTest {
  // omitted here ......


}
class ToolBarFrame extends JFrame{
  public ToolBarFrame(){
    // omitted here ......


    Action blueAction = new ColorAction("Blue",new ImageIcon("src/res/blue-ball.gif"),Color.BLUE);

    Action yellowAction = new ColorAction("Yellow",new ImageIcon("src/res/yellow-ball.gif"),Color.YELLOW);

    Action redAction = new ColorAction("Red",new ImageIcon("src/res/red-ball.gif"),Color.RED);

    Action exitAction = new AbstractAction("Exit",new ImageIcon("src/res/exit.gif")){

        public void actionPerformed(ActionEvent event){

            System.exit(0);

        }

    };

    // omitted here ......

  }
}

 

目录结构如下：

 

D:\Learning\Java\workspace\CoreJavaV1>tree /F
Folder PATH listing for volume 新加卷
Volume serial number is 183E-0660
D:.
│  .classpath
│  .project
│  Instrument.class.violet
│
├─.settings
│      org.eclipse.jdt.core.prefs
│
├─bin
│  │
│  ├─ch09
│  │      SliderTest$1.class
│  │      SliderTest.class
│  │      SliderTestFrame$1.class
│  │      SliderTestFrame.class
│  │      ToolBarFrame$1.class
│  │      ToolBarFrame$ColorAction.class
│  │      ToolBarFrame.class
│  │      ToolBarTest$1.class
│  │      ToolBarTest.class
│  │
│  └─res
│          ace.gif
│          blue-ball.gif
│          exit.gif
│          jack.gif
│          king.gif
│          nine.gif
│          queen.gif
│          red-ball.gif
│          ten.gif
│          yellow-ball.gif
│
└─src
    │
    ├─ch09
    │      BorderTest.java
    │      Calculator.java
    │      CheckBoxTest.java
    │      ComboBoxTest.java
    │      MenuTest.java
    │      RadioButtonTest.java
    │      SliderTest.java
    │      TextComponentTest.java
    │      ToolBarTest.java
    │
    └─res
            ace.gif
            blue-ball.gif
            exit.gif
            jack.gif
            king.gif
            nine.gif
            queen.gif
            red-ball.gif
            ten.gif
            yellow-ball.gif
D:\Learning\Java\workspace\CoreJavaV1>