자바 Se 반사 실현 클래스 와 방법의 주해 스캐닝

     spring       

      
	1、             

package test.qifanedu.reflection;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;



@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Component {
     

}

2、             

package test.qifanedu.reflection;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Auth {
     
}

3、       

package test.qifanedu.reflection;

import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;


public class PackageScan {
     

    public static void main(String[] args) {
     
        Class calzz = PackageScan.class;
        Package pkg = calzz.getPackage();//    
        String rootPkg = pkg.getName().split("\\.")[0];//       
        URL resource = calzz.getResource("/"+rootPkg);//      
        if (resource.getProtocol().startsWith("file")){
     //   file    
           String path =resource.getFile().substring(1);//     /
           File file = new File(path);
           mkdir(file,rootPkg);
        }
    }
    public static void mkdir(File file,String rootPkg){
     
        File[] files = file.listFiles();
        //          
        for (File f:files){
     
            if (f.isDirectory()){
     
                //             
                mkdir(f,rootPkg+"."+f.getName());
            }
            if (f.isFile()){
     
                //     .class   
                if (f.getName().endsWith(".class")){
     
                    //    
                    String clazzName =f.getName().substring(0,f.getName().lastIndexOf("."));
                    try {
     
                        Class tagetClaszz =Class.forName(rootPkg+"."+clazzName);
                        //           
                       if (tagetClaszz.isAnnotationPresent(Component.class)){
     
                           System.out.println(tagetClaszz);

                       }
                       //            
                        Method[] methods = tagetClaszz.getMethods();
                        for (int i = 0; i <methods.length ; i++) {
     
                            if (methods[i].isAnnotationPresent(Auth.class)){
     
                                System.out.println(methods[i]);
                            }
                        }
                    } catch (ClassNotFoundException e) {
     
                        e.printStackTrace();
                    }
                }
            }


        }
    }
}