显示Windows 7的ImageIcon png文件的正确途径是什么？ [英] What is the correct path to display an ImageIcon png file for Windows 7?

问题描述

我想测试一个带有简单png图像的程序。我写了一个简短的程序来做到这一点，但我似乎无法让路径正确。我已经检查，再次检查，重新检查，并检查了我的路径名称四倍，但没有正确，但无论我做什么，这个图像都不会显示。我使用了Oracle在ImageIcon文档（ creaetImageIcon（））中编写的一个简短类来完成此任务，但它似乎没有帮助。我将在下面发布整个程序，因为它非常短。

I wanted to test having a program with a simple png image on it. I wrote a short program that does this, but I can't seem to get the path right. I have checked, checked again, rechecked, and quadruple checked my path name as to not get it right, but this image will not display, no matter what I do. I used a short class wrote by Oracle in the ImageIcon documentation (the creaetImageIcon()) to accomplish this, but it doesn't seem to help. I'll post the entire program below, as it is very short.

package practiceImages;

import java.awt.BorderLayout;
import java.awt.Toolkit;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class ImageIconGUITest {

    public static void main(String[] args) {
        ImageIconGUITest gui = new ImageIconGUITest();
        gui.display();
    }

    private ImageIcon createImageIcon(String path, String description) {
        java.net.URL imgURL = getClass().getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL, description);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }

    private void display() {
        JFrame frame = new JFrame();
        JLabel label = new JLabel(createImageIcon(
                "Users/Evan/javaItems/Sprites_and_Other_Art/green.png", "the color green"));

        frame.add(BorderLayout.CENTER, label);
        frame.setSize(500, 500);
        frame.setVisible(true);
    }
}

推荐答案

getResource（String）方法只能查找应用程序的运行时类路径上的资源。由于此图像看起来像应用程序资源（即由您作为应用程序的一部分提供），因此应放在运行时类路径上。

The getResource(String) method will only find resources that are on the run-time class-path of the application. Since this image seems like an application resource (i.e. supplied by you as part of the application) it should be put on the run-time class-path.

EG大多数IDE都有一个可以在项目结构中放置资源的地方，这些资源将在运行时自动包含在内。将图像移动（或复制）到该路径。

E.G. Most IDEs have a place you can put resources within the project structure, that will automatically be included at run-time. Move (or copy) the image to that path.

然后，提供正确的字符串就成了问题。让我们假设您的项目设置如下：

Then it becomes a matter of providing the correct String. Let us imagine your project is set up something like this:

• bin


• src
  
  

• bin
• src

1. com
   
   
   
   
   • 我们的
     
     

1. com
   • our

1. Application.java

• green.png

所以 Application.java 在包com.our; 中，而图像位于路径 resources / green.png 。

So Application.java is in package com.our;, while the image is in the path resources/green.png.

如果从申请，正确的路径是（请滚筒滚动..）

If accessing the image from the Application, the correct path would be (drum roll please..)

/ resources / green.png

1. 领先 / 很重要。它告诉JRE我们想要从'类路径的根'查找图像，而不是使用相对于类本身的包的路径。


2. 正确的情况也很重要。一串/ resources / green.png将 不 找到名为的图片/resources/Green.png 或 / resources / green.PNG。

1. The leading / is important. It tells the JRE we want to look for the image from the 'root of the class-path', as opposed to using a path relative to the package of the class itself.
2. Correct case is also vital. A string of "/resources/green.png" will not locate an image named "/resources/Green.png" or "/resources/green.PNG".

Eclipse路径

Eclipse paths

1. 对单击 src 目录，选择菜单底部的属性。
   
   


2. 导航（使用你没有使用Eclipse的正常方法）到 Location 的目录。
   


3. 然后转到父目录。


4. 您应该看到一个 bin 目录，其中包含类和（希望）图像。

1. Right click on the src directory, select Properties at the bottom of the menu.
   
2. Navigate (using the normal way you'd use without Eclipse) to the directory of the Location.
3. Then go to the parent directory.
4. You should see a bin directory that contains classes and (hopefully) the image.

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