MyBatis快速入门——第六章、MyBatis拦截器接口(二)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.item.mapper.ProductMapper">
    <select id="GetInfo" resultType="java.util.Map">
        select * from product
        <if test="productName!=null or productType!=null or productColor!=null ">
            where 1=1
        </if>
        <!-- 模糊查询 -->
        <if test="productName!=null">
            and productName like "%${productName}%"
        </if>
        <!-- 类型筛选 -->
        <if test="productType!=null">
            and productType="${productType}"
        </if>
        <!-- 颜色筛选 -->
        <if test="productColor!=null">
            and productColor="${productColor}"
        </if>
    </select>
    <update id="UpdateById">
        update product set productTitle = "${productTitle}" where id=#{id}
    </update>
</mapper>

package com.item.interceptor;

import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.plugin.*;

import java.lang.reflect.Method;
import java.util.Properties;

@Intercepts({
        @Signature(
                type = Executor.class,//指定要拦截的接口
                method = "update",//设置拦截接口中的方法名
                args = {MappedStatement.class,Object.class}//设置拦截方法的参数类型数组
        )
})
public class MyBatisInterceptor implements Interceptor {
    /**
     * 获取被拦截器拦截对象的相关信息
     * @param invocation
     * @return
     * @throws Throwable
     */
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        //拦截目标
        Object target = invocation.getTarget();
        System.out.println("目标:"+target);
        //获取被拦截对象执行的方法
        Method method = invocation.getMethod();
        System.out.println("方法:"+method.getName());
        //获取执行目标的中参数
        Object[] args = invocation.getArgs();
        for (Object o : args) {
            System.out.println("参数:"+o);
        }
        Object proceed = invocation.proceed();
        System.out.println("继续:"+proceed);
        return proceed;
    }

    /**
     * 获取当前拦截对象
     * @param target
     * @return
     */
    @Override
    public Object plugin(Object target) {
        System.out.println("当前拦截对象"+target);
        return Plugin.wrap(target,this);
    }

    /**
     * 获取拦截器插件中的参数值
     * @param properties
     */
    @Override
    public void setProperties(Properties properties) {
        System.out.println("参数0："+properties.get("prop0"));
        System.out.println("参数1："+properties.get("prop1"));
    }
}