loader.getresource
时间: 2023-10-10 07:10:34 浏览: 45
("filename")是用来做什么的?能否举个例子说明它的使用场景?
感谢您的提问。loader.getresource("filename")是用来获取当前类加载器的资源文件的方法。它可以用来直接获取Java类路径中的资源文件。一个常见的例子是在Java Web应用程序中,使用该方法来读取应用程序中的配置文件。例如,如果你有一个名为"config.properties"的配置文件,它在你的Java类路径中,你就可以使用以下代码调用它:
ClassLoader loader = MyClass.class.getClassLoader();
InputStream stream = loader.getResourceAsStream("config.properties");
这是一个非常有用的方法,因为它可以让你避免使用绝对路径,而是根据相对路径来读取资源文件。如果该方法返回null,则表示找不到指定的资源文件。希望以上信息能够对你有所帮助。
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Thread.currentThread().getContextClassLoader().getResource)
This code snippet returns a URL object representing a resource file that is located in the classpath of the current thread's context class loader.
The getResource() method is called on the context class loader of the current thread, which is responsible for loading classes and resources for that thread. The method takes a relative path to a resource file as its argument and returns a URL object that represents the location of the resource file in the classpath.
For example, if the resource file "myFile.txt" is located in the root directory of the classpath, you can obtain its URL as follows:
URL url = Thread.currentThread().getContextClassLoader().getResource("myFile.txt");
The returned URL can be used to read the contents of the resource file, or to pass as an argument to other methods that expect a URL representing a resource.
Thread.currentThread().getContextClassLoader().getResource
This method returns a URL object representing the resource that is located on the classpath. The resource is looked up using the context class loader associated with the current thread. If the resource is not found, null is returned.
Here is an example of how this method can be used:
```
URL resourceUrl = Thread.currentThread().getContextClassLoader().getResource("myResource.txt");
if (resourceUrl != null) {
// Resource found, do something with it
} else {
// Resource not found
}
```
In this example, the method tries to locate a resource named "myResource.txt" on the classpath. If the resource is found, a URL object representing the resource is returned. If the resource is not found, the method returns null. The returned URL can be used to read the contents of the resource or to open a stream to the resource.