使用Java反射從類路徑中加載類

Question

我想加載類不在類路徑中。 有沒有什麼辦法，我沒有在類路徑中加載類的文件路徑？ 例如

ClassLoader.load("c:\MyClass.class"); 

Answer 1

裝入類內容轉換成一個字節數組，手動使用ClassLoader.html#defineClass(java.lang.String, byte[], int, int)。

Answer 2

實施例從here採取：

// Create a File object on the root of the directory containing the class file 
File file = new File("c:\\myclasses\\"); 

try { 
    // Convert File to a URL 
    URL url = file.toURL();   // file:/c:/myclasses/ 
    URL[] urls = new URL[]{url}; 

    // Create a new class loader with the directory 
    ClassLoader cl = new URLClassLoader(urls); 

    // Load in the class; MyClass.class should be located in 
    // the directory file:/c:/myclasses/com/mycompany 
    Class cls = cl.loadClass("com.mycompany.MyClass"); 
} catch (MalformedURLException e) { 
} catch (ClassNotFoundException e) { 
}