JAVA 根据提供的本地class路径转换为class对象

我们通过读取文件的字节并使用自定义的defineClass方法来加载Class对象。
在main方法中，我们创建了一个ConvertToClassObject对象并调用loadClassFromFile方法来加载Class对象。

这种方法直接读取本地文件的字节码来加载Class对象。

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;public class ConvertToClassObject {public Class loadClassFromFile(String filePath) {try {File file = new File(filePath);byte[] classBytes = new byte[(int) file.length()];try (InputStream inputStream = new FileInputStream(file)) {if (inputStream.read(classBytes) != classBytes.length) {throw new IOException("Could not read all bytes from file");}}Class<?> loadedClass = defineClass(classBytes);System.out.println("Class loaded successfully: " + loadedClass.getName());return loadedClass;} catch (IOException e) {System.err.println("Error loading class: " + e.getMessage());}return null;}private Class defineClass(byte[] classBytes) {return new ClassLoader() {public Class<?> getClass(byte[] classBytes) {return defineClass(null, classBytes, 0, classBytes.length);}}.getClass(classBytes);}public static void main(String[] args) {ConvertToClassObject converter = new ConvertToClassObject();String filePath = "/class/2024/06/17/TestController.class";Class loadedClass = converter.loadClassFromFile(filePath);}
}