利用递归遍历获取复杂对象中所有目标属性的值（三）

待我称王封你为后i 2022-03-14 15:08 523阅读 0赞

关于遍历复杂对象中目标属性的值的文章，这是我写的第三篇，也是目前为止我能想到的遍历效率最高的一篇，再前两篇基础上做了相关完善和优化，主要是思路改变了。

具体实现思路：在复杂对象的目标属性上增加自定义注解，目标属性所属类也可能是某个bo的属性，则在这个属性上增加另一个自定义注解，然后利用递归遍历。

闲话少说，直接上代码

###      一、两个自定义注解 ###

>     /**
>      * @author: lsl
>      * @date: 2019/3/1
>      *  作用：字典类属性注解
>      */
>     @Target(value = {ElementType.TYPE,ElementType.FIELD})
>     @Retention(RetentionPolicy.RUNTIME)
>     public @interface DictClass {
>         public String value() default "";
>     }

>     /**
>      * @author: lsl
>      * @date: 2019/3/1
>      *  字典属性注解
>      */
>     @Target(value = {ElementType.FIELD})
>     @Retention(RetentionPolicy.RUNTIME)
>     public @interface DictField {
>         public String dictCode();
>     
>         public String transColumName() default "";
>     
>         public String isSpeRule() default "0";
>     }
> 
>  
> 
>

###  二、核心代码，递归遍历类。主要方法是ergodicObject。入口方法是objectCodeTrans。 ###

>     package com.newcore.pcms.common.support.codetrans.util;
>     
>     import com.halo.core.cache.api.CacheMetaInfoFactory;
>     import com.halo.core.cache.api.CacheService;
>     import com.halo.core.cache.models.IndexItem;
>     import com.halo.core.cache.support.redis.holder.TableHolder;
>     import com.halo.core.common.SpringContextHolder;
>     import com.halo.core.common.models.XOR;
>     import com.halo.core.exception.BusinessException;
>     import com.newcore.pcms.common.support.codetrans.annotation.DictClass;
>     import com.newcore.pcms.common.support.codetrans.annotation.DictField;
>     import com.newcore.pcms.common.support.codetrans.dao.api.ServiceAttrDictDao;
>     import com.newcore.pcms.common.support.codetrans.models.po.pcms.PCodeTransDefPO;
>     import com.newcore.pcms.common.support.codetrans.models.po.pcms.ServiceAttrDictBO;
>     import org.apache.commons.lang3.StringUtils;
>     import org.slf4j.Logger;
>     import org.slf4j.LoggerFactory;
>     
>     import java.beans.IntrospectionException;
>     import java.beans.PropertyDescriptor;
>     import java.lang.reflect.Field;
>     import java.lang.reflect.InvocationTargetException;
>     import java.lang.reflect.Method;
>     import java.util.ArrayList;
>     import java.util.List;
>     import java.util.Map;
>     
>     /**
>      * 对象级的码表转换工具类
>      * @author: lsl
>      * @date: 2018/12/12
>      */
>     public class CodeTransHolderUtils {
>     
>         private static Logger logger = LoggerFactory.getLogger(CodeTransHolderUtils.class);
>     
>         int num=0;
>     //    public static CacheMetaInfoFactory getCacheMetaInfoFactory() {
>     //        return (CacheMetaInfoFactory) SpringContextHolder.getBean("cacheMetaInfoFactory");
>     //    }
>     //
>     //    public static CacheService getCacheService() {
>     //        return (CacheService) SpringContextHolder.getBean("cacheService");
>     //    }
>     
>         /**
>          * 对服务中参数中的属性是字典，进行全部码值转换
>          * @param srcSysCode            源系统
>          * @param destSysCode           目标系统
>          * @param obj                    服务中方法入参
>          * @return
>          */
>         public static List<String> objectCodeTrans(String srcSysCode, String destSysCode,  Object obj) {
>             List<String> listNotIncludeAttr = new ArrayList<>();
>     //        boolean methodParamNameNotBlank = (ConstantTools.FLAG_Y).equals(forwardFlag) ? StringUtils.isNotBlank(serMethodParamName) : true;
>             boolean notBlankFlag = StringUtils.isNotBlank(srcSysCode) && StringUtils.isNotBlank(destSysCode) && (null!= obj) ;
>             logger.info("objectCodeTrans方法的参数：srcSysCode=" + srcSysCode + ",destSysCode=" + destSysCode );
>             CodeTransHolderUtils utils = new CodeTransHolderUtils();
>             long startTime = System.currentTimeMillis();
>             if (notBlankFlag){
>     
>                 if (obj instanceof List<?>) {
>                     utils.ergodicList(srcSysCode, destSysCode,  (List) obj , listNotIncludeAttr);
>                 } else {
>                     utils.ergodicObject(srcSysCode, destSysCode,  obj, listNotIncludeAttr);
>                 }
>             }
>             long endTime = System.currentTimeMillis();
>             System.err.println("对象级码表转换耗时=" + (endTime-startTime) + ",递归次数=" + utils.num);
>             return listNotIncludeAttr;
>         }
>     
>     
>     
>         /**
>          *
>          * @param srcSysCode            源系统
>          * @param destSysCode           目标系统
>          * @param listParam             服务方法入参(list)
>          * @param listNotIncludeAttr   入参字典属性未在码表中找到对应的目标系统字典值的属性名
>          * @param <T>                    码表转换后的入参
>          */
>         public  <T> void ergodicList(String srcSysCode, String destSysCode,  List<T> listParam,  List<String> listNotIncludeAttr) {
>             listParam.stream().forEach(t -> {
>                 ergodicObject(srcSysCode, destSysCode,  t, listNotIncludeAttr);
>             });
>         }
>     
>         /**
>          * 对象级码表转换。把t中指定attribute属性的值更改为目标系统的字典值，并把在目标系统中没有找到字典值的属性放到listNotIncludeAttr
>          * 注意：
>          * 1、t中的属性类型不能包含以下集合嵌套类型：Set、List<Map<K,V>、Map<K,List<BO>>
>          * 2、t中的属性类型可以是BO、数组、List<BO>、Map<K,BO>
>          * 3、属性名一定要规范，比如private PCodeTransDefPO pCodeTransDefPO(不规范)，这样利用反射找不到getter方法，应该改成codeTransDefPO或者PCodeTransDefPO
>          * @param srcSysCode            源系统
>          * @param destSysCode           目标系统
>          * @param t                       入参对象(是BO非list)
>          * @param listNotIncludeAttr    没有在码表中找到目标系统中对应的码值的字典属性
>          * @param <T>                      码表转换后的入参
>          */
>         public  <T> void ergodicObject(String srcSysCode, String destSysCode,  T t,  List<String> listNotIncludeAttr) {
>             num++;
>             Class clazz = t.getClass();
>             Field[] fields = clazz.getDeclaredFields();
>             try {
>                 for (Field field : fields) {
>                     field.setAccessible(true);
>     //                String attrType = field.getType().getSimpleName();//属性类型
>                     String attrShortName = field.getName();//属性名
>     
>                     if (field.isAnnotationPresent(DictField.class)){
>                         String attrValue = (String)field.get(t);//属性值
>                         String dictCode = field.getAnnotation(DictField.class).dictCode();//字典名
>                         String transColumName = field.getAnnotation(DictField.class).transColumName();//词汇名
>                         String isSpeRule = field.getAnnotation(DictField.class).isSpeRule();//是否特殊
>                         if(ConstantTools.DEFAULT_0.equals(isSpeRule) ){
>                             transColumName="";
>                         }
>     //                    String destCodeVal = "";
>                         String destCodeVal =CodeTransDefTools.queryOneUnCodeTransValPOrder(srcSysCode,destSysCode,dictCode,attrValue,isSpeRule,transColumName);
>                         //如果t中的目标属性的值为null或者""，则不需要修改其值
>                         if (attrValue != null && !"".equals(attrValue)){
>                             if (destCodeVal != null && !"".equals(destCodeVal)) {
>                                 //如果从目标系统中查到的字典值非null或者非空字符串，则重新给属性赋值，否则把属性放到listNotIncludeAttr
>                                 field.set(t, destCodeVal);
>                             } else {
>                                 listNotIncludeAttr.add(attrShortName);
>                                 logger.info("在目标系统" + destSysCode + "中,没有找到源系统" + srcSysCode + "中属性是" + attrShortName + "对应的字典" + dictCode + ",找到的字典值是：" + destCodeVal);
>                             }
>                         }
>                     }else if (field.isAnnotationPresent(DictClass.class)){
>                         if (isList(field)){
>                             //对List/ArrayList类型的属性遍历
>                             try {
>                                 PropertyDescriptor descriptor = new PropertyDescriptor(attrShortName, clazz);
>                                 Method method = descriptor.getReadMethod();
>                                 List list = (List) method.invoke(t);
>                                 if (list != null && list.size() > 0) {
>                                     list.stream().forEach(p -> {
>                                         // 递归
>                                         ergodicObject(srcSysCode, destSysCode, p,  listNotIncludeAttr);
>                                     });
>                                 }
>                             } catch (IntrospectionException e) {
>                                 logger.info(e.getMessage());
>                             } catch (InvocationTargetException e) {
>                                 logger.info(e.getMessage());
>                             }
>                         }else if(isMap(field)){
>                             //对Map/HashMap类型的属性遍历
>                             try {
>                                 PropertyDescriptor descriptor = new PropertyDescriptor(attrShortName, clazz);
>                                 Method method = descriptor.getReadMethod();
>                                 Map map = (Map) method.invoke(t);
>                                 if (map != null && map.size() > 0) {
>                                     for (Object obj : map.values()) {
>                                         // 递归
>                                         ergodicObject(srcSysCode, destSysCode,  obj,  listNotIncludeAttr);
>                                     }
>                                 }
>                             } catch (IntrospectionException e) {
>                                 logger.info(e.getMessage());
>                             } catch (InvocationTargetException e) {
>                                 logger.info(e.getMessage());
>                             }
>                         }else if (field.getType().isArray()) {
>                             //对数组类型的属性遍历
>                             field.setAccessible(true);
>                             Object[] objArr = (Object[]) field.get(t);
>                             if (objArr != null && objArr.length > 0) {
>                                 for (Object arr : objArr) {
>                                     //递归
>                                     ergodicObject(srcSysCode, destSysCode, arr, listNotIncludeAttr);
>                                 }
>                             }
>                         }else {
>                             //对自定义类的属性递归
>                             try {
>                                 PropertyDescriptor descriptor = new PropertyDescriptor(attrShortName, clazz);
>                                 Method method = descriptor.getReadMethod();
>                                 Object obj = method.invoke(t);
>                                 if (obj != null) {
>                                     //递归
>                                     ergodicObject(srcSysCode, destSysCode, obj, listNotIncludeAttr);
>                                 } else {
>                                     continue;
>                                 }
>                             } catch (IntrospectionException e) {
>                                 logger.info(e.getMessage());
>                             } catch (InvocationTargetException e) {
>                                 logger.info(e.getMessage());
>                             }
>                         }
>                     }else {
>                         continue;
>                     }
>     
>                 }
>             } catch (IllegalAccessException e) {
>                 logger.info(e.getMessage());
>             }
>     
>         }
>     
>         /**
>          * 判断是否是List或者ArrayList
>          * @param field
>          * @return
>          */
>         public  boolean isList(Field field){
>             boolean flag = false;
>             String simpleName = field.getType().getSimpleName();
>             if ("List".equals(simpleName) || "ArrayList".equals(simpleName)){
>                 flag = true;
>             }
>             return flag;
>         }
>     
>         /**
>          * 判断是否是Map或者HashMap
>          * @param field
>          * @return
>          */
>         public  boolean isMap(Field field){
>             boolean flag = false;
>             String simpleName = field.getType().getSimpleName();
>             if ("Map".equals(simpleName) || "HashMap".equals(simpleName)){
>                 flag = true;
>             }
>             return flag;
>         }
>     
>     
>     }

### 三、如何使用 ###

> 复杂对象如下：
> 
>     package com.lsl.model;
>     
>     import com.lsl.annotion.DictClass;
>     
>     import java.util.List;
>     
>     /**
>      * @author: lsl
>      * @date: 2019/2/27
>      */
>     public class ParentClass {
>         private String fatherName;
>         private int fatherAge;
>         @DictClass
>         private List<SubClass> list;
>         @DictClass
>         private SubClass subClass;
>         public String getFatherName() {
>             return fatherName;
>         }
>     
>         public void setFatherName(String fatherName) {
>             this.fatherName = fatherName;
>         }
>     
>         public int getFatherAge() {
>             return fatherAge;
>         }
>     
>         public void setFatherAge(int fatherAge) {
>             this.fatherAge = fatherAge;
>         }
>     
>         public List<SubClass> getList() {
>             return list;
>         }
>     
>         public void setList(List<SubClass> list) {
>             this.list = list;
>         }
>     
>         public SubClass getSubClass() {
>             return subClass;
>         }
>     
>         public void setSubClass(SubClass subClass) {
>             this.subClass = subClass;
>         }
>     }
> 
>

> 复杂对象ParentClass包含子对象SubClass
> 
> 子对象SubClass代码：
> 
>     package com.lsl.model;
>     
>     import com.lsl.annotion.DictField;
>     
>     /**
>      * @author: lsl
>      * @date: 2019/2/27
>      */
>     public class SubClass {
>         @DictField(dictCode = "aaa")
>         private String subName;
>         private int subAge;
>         public String getSubName() {
>             return subName;
>         }
>     
>         public void setSubName(String subName) {
>             this.subName = subName;
>         }
>     
>         public int getSubAge() {
>             return subAge;
>         }
>     
>         public void setSubAge(int subAge) {
>             this.subAge = subAge;
>         }
>     }
> 
>

>  简单测试，和二、核心代码部分略有区别
> 
>     package com.lsl;
>     
>     import com.alibaba.fastjson.JSON;
>     import com.lsl.annotion.DictClass;
>     import com.lsl.annotion.DictField;
>     import com.lsl.model.ParentClass;
>     import com.lsl.model.SubClass;
>     import com.lsl.service.MyService;
>     import org.springframework.beans.factory.annotation.Autowired;
>     import org.springframework.stereotype.Controller;
>     import org.springframework.stereotype.Service;
>     import org.springframework.transaction.annotation.Transactional;
>     import org.springframework.web.bind.annotation.RequestMapping;
>     
>     import java.beans.IntrospectionException;
>     import java.beans.PropertyDescriptor;
>     import java.lang.reflect.Field;
>     import java.lang.reflect.InvocationTargetException;
>     import java.lang.reflect.Method;
>     import java.sql.Timestamp;
>     import java.util.ArrayList;
>     import java.util.List;
>     import java.util.Map;
>     
>     /**
>      * @author: lsl
>      * @date: 2019/2/15
>      */
>     @Controller
>     @RequestMapping("/lsl")
>     public class MyTest {
>     
>         public static void main(String [] args){
>     
>             SubClass sub1 = new SubClass();
>             sub1.setSubAge(21);
>             sub1.setSubName("aaa");
>             SubClass sub2 = new SubClass();
>             sub2.setSubName("bbb");
>             sub2.setSubAge(20);
>             SubClass sub3 = new SubClass();
>             sub3.setSubName("ccc");
>             sub3.setSubAge(22);
>             List<SubClass> list = new ArrayList();
>             list.add(sub1);
>             list.add(sub2);
>     
>             ParentClass parent = new ParentClass();
>             parent.setFatherAge(18);
>             parent.setFatherName("aaa");
>             parent.setSubClass(sub3);
>             parent.setList(list);
>     
>             ergodicObject(parent);
>         }
>     
>         public static <T> void ergodicObject(T t){
>             Class clazz = t.getClass();
>             Field[] fields = clazz.getDeclaredFields();
>             try {
>                 for (Field field : fields) {
>                     field.setAccessible(true);
>         //                String attrType = field.getType().getSimpleName();//属性类型
>                     String attrShortName = field.getName();//属性名
>                     if (field.isAnnotationPresent(DictField.class)){
>                         String attrValue = (String)field.get(t);//属性值
>                     }else if (field.isAnnotationPresent(DictClass.class)){
>                         if (isList(field)){
>                             //对List/ArrayList类型的属性遍历
>                             try {
>                                 PropertyDescriptor descriptor = new PropertyDescriptor(attrShortName, clazz);
>                                 Method method = descriptor.getReadMethod();
>                                 List list = (List) method.invoke(t);
>                                 if (list != null && list.size() > 0) {
>     
>                                     for(Object obj : list){
>                                         ergodicObject(obj);
>                                     }
>                                 }
>                             } catch (IntrospectionException e) {
>         //                        logger.info(e.getMessage());
>                             } catch (InvocationTargetException e) {
>         //                        logger.info(e.getMessage());
>                             }
>                         }else if(isMap(field)){
>                             //对Map/HashMap类型的属性遍历
>                             try {
>                                 PropertyDescriptor descriptor = new PropertyDescriptor(attrShortName, clazz);
>                                 Method method = descriptor.getReadMethod();
>                                 Map map = (Map) method.invoke(t);
>                                 if (map != null && map.size() > 0) {
>                                     for (Object obj : map.values()) {
>                                         // 递归
>                                         ergodicObject( obj);
>                                     }
>                                 }
>                             } catch (IntrospectionException e) {
>         //                        logger.info(e.getMessage());
>                             } catch (InvocationTargetException e) {
>         //                        logger.info(e.getMessage());
>                             }
>                         }else if (field.getType().isArray()) {
>                             //对数组类型的属性遍历
>                             field.setAccessible(true);
>                             Object[] objArr = (Object[]) field.get(t);
>                             if (objArr != null && objArr.length > 0) {
>                                 for (Object arr : objArr) {
>                                     //递归
>                                     ergodicObject( arr);
>                                 }
>                             }
>                         }else {
>                             //对自定义类的属性递归
>                             try {
>                                 PropertyDescriptor descriptor = new PropertyDescriptor(attrShortName, clazz);
>                                 Method method = descriptor.getReadMethod();
>                                 Object obj = method.invoke(t);
>                                 if (obj != null) {
>                                     //递归
>                                     ergodicObject( obj);
>                                 } else {
>                                     continue;
>                                 }
>                             } catch (IntrospectionException e) {
>         //                        logger.info(e.getMessage());
>                             } catch (InvocationTargetException e) {
>         //                        logger.info(e.getMessage());
>                             }
>                         }
>                     }else {
>                         continue;
>                     }
>                 }
>             } catch (IllegalAccessException e) {
>                 e.printStackTrace();
>             }
>         }
>     
>         public  static boolean isList(Field field){
>             boolean flag = false;
>             String simpleName = field.getType().getSimpleName();
>             if ("List".equals(simpleName) || "ArrayList".equals(simpleName)){
>                 flag = true;
>             }
>             return flag;
>         }
>     
>         /**
>          * 判断是否是Map或者HashMap
>          * @param field
>          * @return
>          */
>         public static   boolean isMap(Field field){
>             boolean flag = false;
>             String simpleName = field.getType().getSimpleName();
>             if ("Map".equals(simpleName) || "HashMap".equals(simpleName)){
>                 flag = true;
>             }
>             return flag;
>         }
>     
>         public static String countMethod(){
>             StringBuffer a= new StringBuffer("11");
>             try {
>                 try {
>                     a = a.append("22");
>                     int m=1/0;
>                 } catch (Exception e) {
>                     System.err.println("内层catch执行");
>                     throw e;
>     
>                 }
>     //            return a.toString();
>             } catch (Exception e) {
>     //            return a.toString();
>                 System.err.println("外层catch执行");
>                 throw e;
>             } finally {
>                 a = a.append("33");
>                 System.err.println("finally==a==" + a);
>             }
>             return a.toString();
>         }
>     
>         @Autowired
>         MyService service;
>     
>     //    @Transactional
>         @RequestMapping("/lock")
>         public  void tranactionalTest(){
>             BizLock lock = new BizLock();
>             BizLock bizLock = new BizLock();
>             bizLock.setBizId("11223344");
>             bizLock.setBizNo("aabbccdd");
>             bizLock.setBizType("MTNNO");
>             long nowTime = System.currentTimeMillis();
>             bizLock.setCreateTime(new Timestamp(nowTime));
>             bizLock.setPassTime(new Timestamp(nowTime));
>             int count = service.addLock(bizLock);
>     
>             if (count==1){
>                 System.err.println("加锁成功" + count);
>             }else {
>                 System.err.println("加锁失败" + count);
>             }
>     //        int aa = 1/0;
>     //        try {
>     //            System.err.println("Thread名字"+ Thread.currentThread().getName() + ",开始休眠8888888");
>     //            Thread.sleep(50000L);
>     //        } catch (InterruptedException e) {
>     //
>     //        }
>     
>             int num=12;
>     
>             System.err.println("endendendend");
>     //        return count;
>         }
>     
>     
>         @RequestMapping("/lock2")
>         public  void tranactionalTes2t(){
>             BizLock lock = new BizLock();
>             BizLock bizLock = new BizLock();
>             bizLock.setBizId("11223344");
>             bizLock.setBizNo("aabbccdd");
>             bizLock.setBizType("MTNNO");
>             long nowTime = System.currentTimeMillis();
>             bizLock.setCreateTime(new Timestamp(nowTime));
>             bizLock.setPassTime(new Timestamp(nowTime));
>             int count = service.addLock(bizLock);
>     
>             if (count==1){
>                 System.err.println("加锁成功" + count);
>             }else {
>                 System.err.println("加锁失败" + count);
>             }
>     //
>     
>     
>             System.err.println("endendendend");
>         }
>     
>     
>     }