getClassLoader().getResource() 返回 null [英] getClassLoader().getResource() returns null

问题描述

我有这个测试应用:

import java.applet.*;
import java.awt.*;
import java.net.URL;
public class Test extends Applet
{

    public void init()
    {
        URL some=Test.class.getClass().getClassLoader().getResource("/assets/pacman.png");
        System.out.println(some.toString());
        System.out.println(some.getFile());
        System.out.println(some.getPath());

    }
}

当我从 Eclipse 运行它时，出现错误:

When I run it from Eclipse, I get the error:

java.lang.NullPointerException
    at Test.init(Test.java:9)
    at sun.applet.AppletPanel.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

类路径(来自 .CLASSPATH 文件)

Classpath (from .CLASSPATH file)

<classpathentry kind="src" path="src"/>

在我的 c:\project\src 文件夹中，我只有 Test.java 文件和包含 pacman.png 的assets"目录.

In my c:\project\src folder, I have only the Test.java file and the 'assets' directory which contains pacman.png.

我做错了什么以及如何解决?

What am I doing wrong and how to resolve it?

推荐答案

我会这样做:

final InputStream stream;

stream = Test.class.getResourceAsStream("assets/pacman.png");
System.out.println("Stream = " + stream);

"/assets/pacman.png" 是绝对位置，而 "assets/pacman.png" 是相对位置.

"/assets/pacman.png" is an absolute location whle "assets/pacman.png" is a relative location.

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