当前位置 博文首页 > GooReey的博客:利用Java反射实现两个具有相同属性bean赋值
由于某种原因,您可能在项目中遇到类似的需求:
package com.guor.entity;
import java.util.Date;
public class UserTxt {
private String ID;
private String USERname;
private String Age;
private String Address;
private String School;
private String create_date;
private String update_date;
private String DELeted;
}
package com.guor.entity;
import java.util.Date;
public class User {
private Integer id;
private String username;
private Integer age;
private String address;
private String school;
private Date createDate;
private Date updateDate;
private Integer deleted;
}
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Slf4j
public class ReflectUtil {
?? ?/**
?? ? * 不同类型,类似属性名称,两个bean之间的赋值,默认数据源bean类型都为String
?? ? */
?? ?public static <T, V> V convertByReflect(T srcObject, Class<V> targetClazz) {
?? ??? ?V targetClass = null;
?? ??? ?try {
?? ??? ??? ?Class<?> srcClazz = Class.forName(srcObject.getClass().getName());
?? ??? ??? ?targetClass = targetClazz.newInstance();
?? ??? ??? ?// 获取两个实体类的所有属性
?? ??? ??? ?Field[] srcFields = srcClazz.getDeclaredFields();
?? ??? ??? ?Field[] targetFields = targetClazz.getDeclaredFields();
?? ??? ??? ?// 遍历srcFields,获取属性值,然后遍历targetObject查找是否有相同的属性,如有相同则根据类型赋值
?? ??? ??? ?for (Field srcField : srcFields) {
?? ??? ??? ??? ?Object value = invokeGetMethod(srcObject, srcField.getName());
?? ??? ??? ??? ?for (Field targetField : targetFields) {
?? ??? ??? ??? ??? ?if (srcField.getName().toLowerCase().equals(targetField.getName().toLowerCase())) {
?? ??? ??? ??? ??? ??? ?// 两个类型是否相同
?? ??? ??? ??? ??? ??? ?if (srcField.getType().equals(targetField.getType())) {
?? ??? ??? ??? ??? ??? ??? ?setFieldValue(targetField, targetClass, value);
?? ??? ??? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ??? ??? ?setFieldValueByType(targetField, targetClass, value);
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ?} catch (Exception e) {
?? ??? ??? ?log.error("convertByReflect Error {}", e.getMessage());
?? ??? ??? ?return null;
?? ??? ?}
?? ??? ?return targetClass;
?? ?}
?? ?
public static <V, T> T mapToBean(Map<String, V> map, Class<T> targetClazz) {
?? ??? ?T targetClass = null;
?? ??? ?try {
?? ??? ??? ?targetClass = targetClazz.newInstance();
?? ??? ??? ?Field[] targetFields = targetClazz.getDeclaredFields();
?? ??? ??? ?for (Map.Entry<String, V> entry : map.entrySet()) {
?? ??? ??? ??? ?for (Field targetField : targetFields) {
?? ??? ??? ??? ??? ?if (entry.getKey().toLowerCase().equals(targetField.getName().toLowerCase())) {
?? ??? ??? ??? ??? ??? ?// 两个类型是否相同
?? ??? ??? ??? ??? ??? ?if (entry.getValue().getClass().getTypeName().equals(targetField.getType())) {
?? ??? ??? ??? ??? ??? ??? ?setFieldValue(targetField, targetClass, entry.getValue());
?? ??? ??? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ??? ??? ?setFieldValueByType(targetField, targetClass, entry.getValue());
?? ??? ??? ??? ??? ??? ?}
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ?} catch (Exception e) {
?? ??? ??? ?log.error("mapToBean Error {}", e.getMessage());
?? ??? ??? ?return null;
?? ??? ?}
?? ??? ?return targetClass;
?? ?}
?? ?
?? ?/**
?? ? * 不同类型,类似属性名称,两个List<bean>之间的赋值,默认数据源bean类型都为String
?? ? *?
?? ? * @param srcObjectList 数据源List<bean>
?? ? * @param targetClazz ? 目标类Class
?? ? * @return
?? ? */
public static <T, V> List<V> convertListByReflect(List<T> srcObjectList, Class<V> targetClazz) {
?? ??? ?List<V> retList = new ArrayList<V>();
?? ??? ?try {
?? ??? ??? ?V targetClass = targetClazz.newInstance();
?? ??? ??? ?for (T srcObject : srcObjectList) {
?? ??? ??? ??? ?targetClass = convertByReflect(srcObject, targetClazz);
?? ??? ??? ??? ?if (targetClass == null) {
?? ??? ??? ??? ??? ?return new ArrayList<V>();
?? ??? ??? ??? ?}
?? ??? ??? ??? ?retList.add(targetClass);
?? ??? ??? ?}
?? ??? ?} catch (Exception e) {
?? ??? ??? ?log.error("convertByReflect Error {}", e.getMessage());
?? ??? ??? ?return new ArrayList<V>();
?? ??? ?}
?? ??? ?return retList;
?? ?}
?? ?/**
?? ? * 获取值
?? ? *?
?? ? * @param clazz ? ? 类
?? ? * @param fieldName 类的属性名称
?? ? * @return
?? ? */
?? ?private static Object invokeGetMethod(Object clazz, String fieldName) {
?? ??? ?String methodName = fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
?? ??? ?Method method = null;
?? ??? ?try {
?? ??? ??? ?method = Class.forName(clazz.getClass().getName()).getDeclaredMethod("get" + methodName);
?? ??? ??? ?return method.invoke(clazz);
?? ??? ?} catch (Exception e) {
?? ??? ??? ?return "";
?? ??? ?}
?? ?}
?? ?/**
?? ? * 设置方法值
?? ? */
?? ?private static void setFieldValue(Field field, Object obj, Object value) throws IllegalAccessException {
?? ??? ?// 获取原有的访问权限
?? ??? ?boolean access = field.isAccessible();
?? ??? ?try {
?? ??? ??? ?// 设置可访问的权限
?? ??? ??? ?field.setAccessible(true);
?? ??? ??? ?field.set(obj, value);
?? ??? ?} finally {
?? ??? ??? ?// 恢复访问权限
?? ??? ??? ?field.setAccessible(access);
?? ??? ?}
?? ?}
?? ?/**
?? ? * 根据类型设置方法值
?? ? */
?? ?private static void setFieldValueByType(Field targetField, Object target, Object value)
?? ??? ??? ?throws IllegalAccessException {
?? ??? ?Class<?> targetType = targetField.getType();
?? ??? ?String valueStr = String.valueOf(value);
?? ??? ?if (targetType == Integer.class) {
?? ??? ??? ?setFieldValue(targetField, target, Integer.valueOf(valueStr));
?? ??? ?} else if (targetType == Double.class) {
?? ??? ??? ?setFieldValue(targetField, target, Double.valueOf(valueStr));
?? ??? ?} else if (targetType == Float.class) {
?? ??? ??? ?setFieldValue(targetField, target, Float.valueOf(valueStr));
?? ??? ?} else if (targetType == Boolean.class) {
?? ??? ??? ?setFieldValue(targetField, target, Boolean.parseBoolean(valueStr));
?? ??? ?} else if (targetType == Long.class) {
?? ??? ??? ?setFieldValue(targetField, target, Long.parseLong(valueStr));
?? ??? ?} else if (targetType == Short.class) {
?? ??? ??? ?setFieldValue(targetField, target, Short.parseShort(valueStr));
?? ??? ?} else if (targetType == Date.class) {
?? ??? ??? ?String dateStr = StrUtil.getDigital(valueStr);
?? ??? ??? ?setFieldValue(targetField, target, StrUtil.stringToDate(dateStr, "yyyyMMddHHmmss"));
?? ??? ?} else {
?? ??? ??? ?setFieldValue(targetField, target, valueStr);
?? ??? ?}
?? ?}
}
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