package com.yjy.annotation;
?
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 ModelSumbit{
? ?
? ? String value() default "";
}

package com.lyf.aspect;
 
import com.lyf.service.LogService;
import com.lyf.utils.SqlUtils;
import org.apache.ibatis.session.SqlSessionFactory;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
 
 
 
@Aspect
@Component
public class MyAdvice {
 
    @Autowired
    private LogService logService;
 
    @Autowired
    private SqlSessionFactory sqlSessionFactory;
 
 
    @Pointcut("@annotation(com.yjy.annotation.ModelSumbit)")
    private void pc(){
 
    }
 
    //前置通知
    //指定該方法是前置通知，并指定切入點(diǎn)
    @Before("MyAdvice.pc()")
    public void before(){
//        System.out.println("這是前置通知?。。。?！");
    }
 
    //后置通知
    @AfterReturning("MyAdvice.pc()")
    public void afterReturning(){
//        System.out.println("這是后置通知！(如果出現(xiàn)異常，將不會(huì)調(diào)用)?。。。?);
    }
 
    //環(huán)繞通知
    @Around("MyAdvice.pc()")
    public Object around(ProceedingJoinPoint pjp) throws Throwable{
        //1.從redis中獲取主數(shù)據(jù)庫，若獲取不到直接退出，否則判斷當(dāng)前數(shù)據(jù)源是會(huì)否為主，若不為主，則切換到主數(shù)據(jù)源
        //2.調(diào)用目標(biāo)方法
        Object proceed = pjp.proceed();
        //3.獲取SQL
        String sql = SqlUtils.getMybatisSql(pjp,sqlSessionFactory);
        System.out.println(sql);
        //4.插入日志
        logService.insert(sql);
        //5.通知同步程序
        return proceed;
    }
 
    //異常通知
    @AfterThrowing("MyAdvice.pc()")
    public void afterException(){
//        System.out.println("出事了，拋異常了?。。。?);
    }
 
    //后置通知
    @After("MyAdvice.pc()")
    public void after(){
//        System.out.println("這是后置通知！(無論是否出現(xiàn)異常都會(huì)調(diào)用)?。。。?);
    }
}

package com.lyf.utils;
 
import com.sun.deploy.util.ArrayUtil;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.reflect.MethodSignature;
 
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.text.DateFormat;
import java.util.*;
 
public class SqlUtils {
 
    /**
     * 獲取aop中的SQL語句
     * @param pjp
     * @param sqlSessionFactory
     * @return
     * @throws IllegalAccessException
     */
    public static String getMybatisSql(ProceedingJoinPoint pjp, SqlSessionFactory sqlSessionFactory) throws IllegalAccessException {
        Map<String,Object> map = new HashMap<>();
        //1.獲取namespace+methdoName
        MethodSignature signature = (MethodSignature) pjp.getSignature();
        Method method = signature.getMethod();
        String namespace = method.getDeclaringClass().getName();
        String methodName = method.getName();
        //2.根據(jù)namespace+methdoName獲取相對應(yīng)的MappedStatement
        Configuration configuration = sqlSessionFactory.getConfiguration();
        MappedStatement mappedStatement = configuration.getMappedStatement(namespace+"."+methodName);
//        //3.獲取方法參數(shù)列表名
//        Parameter[] parameters = method.getParameters();
        //4.形參和實(shí)參的映射
        Object[] objects = pjp.getArgs(); //獲取實(shí)參
        Annotation[][] parameterAnnotations = method.getParameterAnnotations();
        for (int i = 0;i<parameterAnnotations.length;i++){
            Object object = objects[i];
            if (parameterAnnotations[i].length == 0){ //說明該參數(shù)沒有注解，此時(shí)該參數(shù)可能是實(shí)體類，也可能是Map，也可能只是單參數(shù)
                if (object.getClass().getClassLoader() == null && object instanceof Map){
                    map.putAll((Map<? extends String, ?>) object);
                    System.out.println("該對象為Map");
                }else{//形參為自定義實(shí)體類
                    map.putAll(objectToMap(object));
                    System.out.println("該對象為用戶自定義的對象");
                }
            }else{//說明該參數(shù)有注解，且必須為@Param
                for (Annotation annotation : parameterAnnotations[i]){
                    if (annotation instanceof Param){
                        map.put(((Param) annotation).value(),object);
                    }
                }
            }
        }
        //5.獲取boundSql
        BoundSql boundSql = mappedStatement.getBoundSql(map);
        return showSql(configuration,boundSql);
    }
 
    /**
     * 解析BoundSql，生成不含占位符的SQL語句
     * @param configuration
     * @param boundSql
     * @return
     */
    private  static String showSql(Configuration configuration, BoundSql boundSql) {
        Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
        if (parameterMappings.size() > 0 && parameterObject != null) {
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\\?", getParameterValue(parameterObject));
            } else {
                MetaObject metaObject = configuration.newMetaObject(parameterObject);
                for (ParameterMapping parameterMapping : parameterMappings) {
                    String propertyName = parameterMapping.getProperty();
                    String[] s =  metaObject.getObjectWrapper().getGetterNames();
                    s.toString();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sql = sql.replaceFirst("\\?", getParameterValue(obj));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\\?", getParameterValue(obj));
                    }
                }
            }
        }
        return sql;
    }
 
    /**
     * 若為字符串或者日期類型，則在參數(shù)兩邊添加''
     * @param obj
     * @return
     */
    private static String getParameterValue(Object obj) {
        String value = null;
        if (obj instanceof String) {
            value = "'" + obj.toString() + "'";
        } else if (obj instanceof Date) {
            DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
            value = "'" + formatter.format(new Date()) + "'";
        } else {
            if (obj != null) {
                value = obj.toString();
            } else {
                value = "";
            }
        }
        return value;
    }
 
    /**
     * 獲取利用反射獲取類里面的值和名稱
     *
     * @param obj
     * @return
     * @throws IllegalAccessException
     */
    private static Map<String, Object> objectToMap(Object obj) throws IllegalAccessException {
        Map<String, Object> map = new HashMap<>();
        Class<?> clazz = obj.getClass();
        System.out.println(clazz);
        for (Field field : clazz.getDeclaredFields()) {
            field.setAccessible(true);
            String fieldName = field.getName();
            Object value = field.get(obj);
            map.put(fieldName, value);
        }
        return map;
    }
}

@ModelSumbit
void insert(User user);

@ModelSumbit
void insert(Map<String,Object> map);

@ModelSumbit
void insert(@Param("userName") String userName, @Param("age")Integer age);