99 lines
3.4 KiB
Java
99 lines
3.4 KiB
Java
package com.xkrs.common.tool;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* dao接口类处理工具
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* @author tajochen
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*/
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public class EntityUtil {
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private static final Logger logger = LoggerFactory.getLogger(EntityUtil.class);
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/**
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* 将数组数据转换为实体类
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* 此处数组元素的顺序必须与实体类构造函数中的属性顺序一致
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* @param list 数组对象集合
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* @param clazz 实体类
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* @param <T> 实体类
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* @param model 实例化的实体类
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* @return 实体类集合
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*/
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public static <T> List<T> castEntity(List<Object[]> list, Class<T> clazz, Object model) {
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List<T> returnList = new ArrayList<T>();
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if (list.isEmpty()) {
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return returnList;
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}
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//获取每个数组集合的元素个数
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Object[] co = list.get(0);
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//获取当前实体类的属性名、属性值、属性类别
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List<Map> attributeInfoList = getFiledsInfo(model);
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//创建属性类别数组
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Class[] c2 = new Class[attributeInfoList.size()];
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//如果数组集合元素个数与实体类属性个数不一致则发生错误
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if (attributeInfoList.size() != co.length) {
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return returnList;
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}
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//确定构造方法
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for (int i = 0; i < attributeInfoList.size(); i++) {
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c2[i] = (Class) attributeInfoList.get(i).get("type");
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}
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try {
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for (Object[] o : list) {
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Constructor<T> constructor = clazz.getConstructor(c2);
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returnList.add(constructor.newInstance(o));
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}
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} catch (Exception ex) {
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logger.error("实体数据转化为实体类发生异常：异常信息：{}", ex.getMessage());
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return returnList;
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}
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return returnList;
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}
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/**
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* 根据属性名获取属性值
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* @param fieldName 属性名
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* @param modle 实体类
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* @return 属性值
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*/
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private static Object getFieldValueByName(String fieldName, Object modle) {
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try {
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String firstLetter = fieldName.substring(0, 1).toUpperCase();
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String getter = "get" + firstLetter + fieldName.substring(1);
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Method method = modle.getClass().getMethod(getter, new Class[]{});
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Object value = method.invoke(modle, new Object[]{});
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return value;
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} catch (Exception e) {
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return null;
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}
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}
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/**
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* 获取属性类型(type)，属性名(name)，属性值(value)的map组成的list
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* @param model 实体类
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* @return list集合
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*/
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private static List<Map> getFiledsInfo(Object model) {
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Field[] fields = model.getClass().getDeclaredFields();
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List<Map> list = new ArrayList(fields.length);
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Map infoMap = null;
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for (int i = 0; i < fields.length; i++) {
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infoMap = new HashMap(3);
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infoMap.put("type", fields[i].getType());
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infoMap.put("name", fields[i].getName());
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infoMap.put("value", getFieldValueByName(fields[i].getName(), model));
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list.add(infoMap);
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}
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return list;
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}
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}
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