通过ASM 反射实现IOC

// 
注解类
package hgs.asm;
public @interface AutoWare {
}
//AnoDesc 里面的一个属性
package hgs.asm;
public class A {
}
package hgs.asm;
//用于操作的类
public class AnoDesc {
	String name = "hgs";
	int age = 100;
	
	@AutoWare
	A a;
	public void saySomething(String desc) {
		System.out.println("say:" + desc);
	}
	
	
}
//测试
package hgs.asm;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.List;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AnnotationNode;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.FieldNode;
public class Test {
	
	public static void test1() throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchFieldException, SecurityException {
		String clazz  = "hgs.asm.AnoDesc";
        Class<?> forName = Class.forName(clazz);
        
        AnoDesc newInstance = (AnoDesc)forName.newInstance();
        //通过asm读取类  通过其属性api 来访问类的属性 方法 注解
		ClassNode node = new ClassNode();
        //node.superName ="org.objectweb.asm.ClassVisitor";
		
        ClassReader reader = new ClassReader("hgs.asm.AnoDesc");
        //ClassWriter writer = new ClassWriter(0);
        reader.accept(node,0);
        //node.accept(writer);
        //得到所有的属性
        List<FieldNode> fields = node.fields;
        for(FieldNode fnd: fields) {
        	String name = fnd.name;
        	String desc = fnd.desc;
        	Object value = fnd.value;
        	Type tp = Type.getObjectType(desc);
        	System.out.println("name:"+name);
        	
        	System.out.println("desc:"+desc);
        	System.out.println("value:"+value);
        	System.out.println("type:"+tp.getInternalName());
        	
        	
        	System.out.println();
        	//判断属性是否存在 AutoWare注解
        	List<AnnotationNode> invisibleAnnotations = fnd.invisibleAnnotations;
        	if(invisibleAnnotations!=null ) {
        		for(AnnotationNode and : invisibleAnnotations) {
        			System.out.println("	anotation:"+and.desc);
        			System.out.println("equals:"+"Lhgs/asm/AutoWare;".equals(and.desc));
        			//存在的话 就把该属性初始化
        			if("Lhgs/asm/AutoWare;".equals(and.desc)) {
        				String qiliName = tp.getInternalName().replaceFirst("L", "").replaceAll("/", "\\.").replace(";", "");
        				System.out.println("qulity name :"+ qiliName);
        				Class<?> fi = Class.forName(qiliName);
        				Field declaredField = forName.getDeclaredField(name);
        				declaredField.set(newInstance,fi.newInstance() );
        			}
        		}
        	}
        }
        System.out.println(newInstance.a);
	}
	public static void main(String[] args) throws Exception{
		test1();
	}
}
结果