相关概念:

定义注解

package cn.baokx.annotation;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Target(value={ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)public @interface MyTableAnnotation {	String value();}

package cn.baokx.annotation;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Target(value={ElementType.FIELD})@Retention(RetentionPolicy.RUNTIME)public @interface MyFieldAnnotation {	String columnName();	String type();}

package cn.baokx.annotation;@MyTableAnnotation("TBL_STUDENT")public class Student {	@MyFieldAnnotation(columnName="NAME",type="VARCHAR")	private String name;	@MyFieldAnnotation(columnName="AGE",type="INT")	private int age;	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public int getAge() {		return age;	}	public void setAge(int age) {		this.age = age;	}	}

package cn.baokx.annotation;import java.lang.reflect.Field;public class Main {	public static void main(String[] args) throws NoSuchFieldException, SecurityException, ClassNotFoundException {		Student stu = new Student();		stu.setName("baokx");		stu.setAge(30);		handler(stu);	}		public static void handler(Student stu) throws NoSuchFieldException, SecurityException, ClassNotFoundException{		Class clazz = stu.getClass();		MyTableAnnotation mta = (MyTableAnnotation) clazz.getAnnotation(MyTableAnnotation.class);		System.out.println("tableName:"+mta.value());				Field f = clazz.getDeclaredField("name");		MyFieldAnnotation mfa = f.getAnnotation(MyFieldAnnotation.class);		System.out.println("columnName:"+mfa.columnName());		System.out.println("type:"+mfa.type());		System.out.println("value:"+stu.getName());				f = clazz.getDeclaredField("age");		mfa = f.getAnnotation(MyFieldAnnotation.class);		System.out.println("columnName:"+mfa.columnName());		System.out.println("type:"+mfa.type());		System.out.println("value:"+stu.getAge());	}}