java动态编译加载类

不负自心 2017-03-14 03:00:29

public static void main(String[] args) throws IOException,
InstantiationException, IllegalAccessException,
NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {
// 编译程序
JavaCompiler javaCompiler = ToolProvider.getSystemJavaCompiler();
int result = javaCompiler.run(null, null, null, "D:\\test.java");
System.out.println(result == 0 ? "恭喜编译成功" : "对不起编译失败");

File file = new File("D:\\test.class");

URL url = file.toURL();

URLClassLoader loader = new URLClassLoader(new URL[]{url});
try {
Class<?> cls = loader.loadClass("test");
Object obj = cls.newInstance();
Method method = cls.getMethod("main",String[].class);
Object o = method.invoke(obj,new Object[]{args});
System.out.println(String.valueOf(o));
System.out.println("11");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
代码运行到Object o = method.invoke(obj,new Object[]{args});这里的时候就会重头开始再来一直循环，到底是什么原因求大神帮帮忙，谢谢！
或者有什么其他的办法实现类的加载，我需要获得结果！

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不负自心 2019-05-01

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引用楼主 qq_24744939的回复:

public static void main(String[] args) throws IOException,
InstantiationException, IllegalAccessException,
NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {
// 编译程序
JavaCompiler javaCompiler = ToolProvider.getSystemJavaCompiler();
int result = javaCompiler.run(null, null, null, "D:\\test.java");
System.out.println(result == 0 ? "恭喜编译成功" : "对不起编译失败");

File file = new File("D:\\test.class");

URL url = file.toURL();

URLClassLoader loader = new URLClassLoader(new URL[]{url});
try {
Class<?> cls = loader.loadClass("test");
Object obj = cls.newInstance();
Method method = cls.getMethod("main",String[].class);
Object o = method.invoke(obj,new Object[]{args});
System.out.println(String.valueOf(o));
System.out.println("11");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
代码运行到Object o = method.invoke(obj,new Object[]{args});这里的时候就会重头开始再来一直循环，到底是什么原因求大神帮帮忙，谢谢！
或者有什么其他的办法实现类的加载，我需要获得结果！

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