用示例在 Java 中类 getResourceAsStream()方法
原文:https://www . geesforgeks . org/class-getresourceasstream-method-in-Java-with-examples/
java.lang.Class 类 的GetResourcesStream()方法用于获取该类指定资源的资源。方法以 InputStream 对象的形式返回此类的指定资源。
语法:
public InputStream getResourceAsStream(String resourceName)
参数:这个方法接受一个参数 resourceName ，这个参数就是要获取的资源。
返回值:该方法以 InputStream 对象的形式返回该类的指定资源。
异常此方法抛出:
- null pointer exception If the name is empty
下面的程序演示了 getResourceAsStream()方法。
例 1:
// Java program to demonstrate
// getResourceAsStream() method
import java.util.*;
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object for this class
Class myClass = Class.forName("Test");
System.out.println("Class represented by myClass: "
+ myClass.toString());
String resourceName = "obj";
// Get the resource of myClass
// using getResourceAsStream() method
System.out.println(
resourceName + " resource of myClass: "
+ myClass.getResourceAsStream(resourceName));
}
}
输出:
Class represented by myClass: class Test
obj resource of myClass: null
例 2:
// Java program to demonstrate
// getResourceAsStream() method
import java.util.*;
class Main {
private Object obj;
public static void main(String[] args)
throws ClassNotFoundException, NoSuchFieldException
{
// returns the Class object for this class
Class myClass = Class.forName("Main");
System.out.println("Class represented by myClass: "
+ myClass.toString());
String resourceName = "obj";
try {
// Get the resource of myClass
// using getResourceAsStream() method
System.out.println(
resourceName + " resource of myClass: "
+ myClass.getResourceAsStream(resourceName));
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Class represented by myClass: class Main
obj resource of myClass: null
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