java - Java how to use an image within a jar file

Question

I was making a game using a JFrame that would load an image to be displayed. Then when I tried to run the program, it didn't find the image in the jar. So, how do you retrieve a file from within a jar? Is it /img.png or img.png or even \\img.png? I just don't know how paths in java work yet.

(Edit) Figured it out.

Answer 1

/img.png 是正确的。你是如何尝试加载它的？您需要使用知道该 JAR 文件的类加载器来获取图像文件。

试试这个方法：

http://docs.oracle.com/javase/6/docs/api/java/lang/ClassLoader.html#getResourceAsStream(java.lang.String)

尝试这样的事情，假设 JAR 文件在你的类路径中。

public class MyClass {
    public static void main(String[] args) {
        InputStream is = MyClass.class.getClassLoader().getResourceAsStream("/img.png");
        // read in the data stream
    }
}

Answer 2

例如，这是jar文件结构

确保 jar 在类路径中，然后像这样编码

String file01="tom.txt";
String file02="com/paic/jerry.txt";  
InputStream tom=this.getClass().getClassLoader().getResourceAsStream(file01);
InputStream jerry=this.getClass().getClassLoader().getResourceAsStream(file02);