注解Table

package annotation;import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;import javax.lang.model.element.Element;@Documented@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.TYPE)public @interface Table {	public String tableName();	public String schema() default "b3blog";}

注解Column

package annotation;import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Inherited;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Inherited@Documented@Target(ElementType.FIELD)@Retention(RetentionPolicy.RUNTIME)public @interface Column {	public String value();}

定义一个实体User

package model;import annotation.Column;import annotation.Table;@Table(tableName="solo_user")public class User {		@Column("id")	private Integer id;	@Column("name")	private String name;	@Column("sex")	private Integer sex;	public Integer getId() {		return id;	}	public void setId(Integer id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public Integer getSex() {		return sex;	}	public void setSex(Integer sex) {		this.sex = sex;	}		}

测试类Test

package javaassist;import java.lang.annotation.Annotation;import java.lang.reflect.Field;import model.User;import annotation.Column;import annotation.Table;public class Test {    public static void main(String[] args) throws Exception {    	    	    	//得到所有的注解    	Annotation[] annotations=User.class.getAnnotations();    	for (int i = 0; i < annotations.length; i++) {    		//判断注解类型    		if (annotations[i].annotationType().equals(Table.class)) {				Table tableAnnotation=(Table) annotations[i];				System.out.println("表名称:"+tableAnnotation.tableName());				System.out.println("schema默认值:"+tableAnnotation.schema());			}    				}    	    	Field[] fields=User.class.getDeclaredFields();    	for (Field field : fields) {			Column columnAnnotation=field.getAnnotation(Column.class);			if (columnAnnotation!=null) {				System.out.println("字段名称:"+field.getName()+"  注解value:"+columnAnnotation.value());			}		}    }}

运行结果

表名称:solo_userschema默认值:b3blog字段名称:id  注解value:id字段名称:name  注解value:name字段名称:sex  注解value:sex