類類getResourceAsStream()方法 (Class class getResourceAsStream() method)

• getResourceAsStream() method is available in java.lang package.

  getResourceAsStream()方法在java.lang包中可用。

• getResourceAsStream() method is used to get the resource as a parameter and convert the resource into InputStream.

  getResourceAsStream()方法用于獲取資源作為參數并將資源轉換為InputStream。

• getResourceAsStream() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  getResourceAsStream()方法是一個非靜態方法，只能通過類對象進行訪問，如果嘗試使用類名訪問該方法，則會收到錯誤消息。

• getResourceAsStream() method may throw an exception at the time of returning InputStream object.

  返回InputStream對象時， getResourceAsStream()方法可能會引發異常。

  NullPointerException: This exception may raise when the given resource_name is null.

  NullPointerException ：當給定的resource_name為null時，可能會引發此異常。

Syntax:

句法：

public InputStream getResourceAsStream(String resource_name);

Parameter(s):

參數：

• String resource_name – represents the name of the resource.

  字符串resource_name –表示資源的名稱。

Return value:

返回值：

The return type of this method is InputStream, it returns the following values based on the following cases,

此方法的返回類型為InputStream ，它基于以下情況返回以下值：

• It returns the InputStream, when any resource associated with the given name exists.

  當存在與給定名稱關聯的任何資源時，它將返回InputStream 。

• It returns null, when no resource associated with the given name exists.

  當不存在與給定名稱關聯的資源時，它返回null 。

Example:

例：

// Java program to demonstrate the example // of InputStream getResourceAsStream(String resource_name) // method of Class import java.io.*; import java.util.*;public class GetResourceAsStreamOfClass {public static String resource(String res) {String count = "";try {Class cl = Class.forName("GetResourceAsStreamOfClass");ClassLoader loader = cl.getClassLoader();// By using getResourceAsStream() method is to take the resource// and convert it into InputStreamInputStream is = loader.getResourceAsStream(res);InputStreamReader isr = new InputStreamReader(is);BufferedReader br = new BufferedReader(isr);String line;while ((line = br.readLine()) != null) {count = count + 1;}is.close();} catch (Exception ex) {ex.printStackTrace();}return count;}public static void main(String[] args) throws Exception {System.out.println(resource("Includehelp.doc"));} }

Output

輸出量

Includehelp is a technical site

翻譯自: https://www.includehelp.com/java/class-class-getresourceasstream-method-with-example.aspx

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