Java Class getResourceAsStream()用法及代碼示例

java.lang.Class類的getResourceAsStream()方法用於獲取具有此類指定資源的資源。該方法以InputStream對象的形式返回此類的指定資源。

用法:

public InputStream getResourceAsStream(String resourceName)

參數：此方法接受參數resourceName，這是要獲取的資源。

返回值：此方法以InputStream對象的形式返回此類的指定資源。

異常該方法拋出：

NullPointerException 如果名稱為null

下麵的程序演示了getResourceAsStream()方法。

範例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)); 
    } 
}

輸出：

Class represented by myClass:class Test
obj resource of myClass:null

範例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); 
        } 
    } 
}

輸出：

Class represented by myClass:class Main
obj resource of myClass:null

參考： https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getResourceAsStream-java.lang.String-

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