java复制类的值不复制引用
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2024-01-04 12:39:34
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工具类:
package com.eazo.sparta.project.std.function.bean;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
public class CloneTool {
/**
* 利用反射实现对象之间属性复制
* @param from
* @param to
*/
public static void copyProperties(Object from, Object to) throws Exception {
copyPropertiesExclude(from, to, null);
}
/**
* 复制对象属性
* @param from
* @param to
* @param excludsArray 排除属性列表
* @throws Exception
*/
@SuppressWarnings("unchecked")
public static void copyPropertiesExclude(Object from, Object to, String[] excludsArray) throws Exception {
List<String> excludesList = null;
if(excludsArray != null && excludsArray.length > 0) {
excludesList = Arrays.asList(excludsArray); //构造列表对象
}
Method[] fromMethods = from.getClass().getDeclaredMethods();
Method[] toMethods = to.getClass().getDeclaredMethods();
Method fromMethod = null, toMethod = null;
String fromMethodName = null, toMethodName = null;
for (int i = 0; i < fromMethods.length; i++) {
fromMethod = fromMethods[i];
fromMethodName = fromMethod.getName();
if (!fromMethodName.contains("get"))
continue;
//排除列表检测
if(excludesList != null && excludesList.contains(fromMethodName.substring(3).toLowerCase())) {
continue;
}
toMethodName = "set" + fromMethodName.substring(3);
toMethod = findMethodByName(toMethods, toMethodName);
if (toMethod == null)
continue;
Object value = fromMethod.invoke(from, new Object[0]);
if(value == null)
continue;
//集合类判空处理
if(value instanceof Collection) {
Collection newValue = (Collection)value;
if(newValue.size() <= 0)
continue;
}
toMethod.invoke(to, new Object[] {value});
}
}
/**
* 对象属性值复制,仅复制指定名称的属性值
* @param from
* @param to
* @param includsArray
* @throws Exception
*/
@SuppressWarnings("unchecked")
public static void copyPropertiesInclude(Object from, Object to, String[] includsArray) throws Exception {
List<String> includesList = null;
if(includsArray != null && includsArray.length > 0) {
includesList = Arrays.asList(includsArray); //构造列表对象
} else {
return;
}
Method[] fromMethods = from.getClass().getDeclaredMethods();
Method[] toMethods = to.getClass().getDeclaredMethods();
Method fromMethod = null, toMethod = null;
String fromMethodName = null, toMethodName = null;
for (int i = 0; i < fromMethods.length; i++) {
fromMethod = fromMethods[i];
fromMethodName = fromMethod.getName();
if (!fromMethodName.contains("get"))
continue;
//排除列表检测
String str = fromMethodName.substring(3);
if(!includesList.contains(str.substring(0,1).toLowerCase() + str.substring(1))) {
continue;
}
toMethodName = "set" + fromMethodName.substring(3);
toMethod = findMethodByName(toMethods, toMethodName);
if (toMethod == null)
continue;
Object value = fromMethod.invoke(from, new Object[0]);
if(value == null)
continue;
//集合类判空处理
if(value instanceof Collection) {
Collection newValue = (Collection)value;
if(newValue.size() <= 0)
continue;
}
toMethod.invoke(to, new Object[] {value});
}
}
/**
* 从方法数组中获取指定名称的方法
*
* @param methods
* @param name
* @return
*/
public static Method findMethodByName(Method[] methods, String name) {
for (int j = 0; j < methods.length; j++) {
if (methods[j].getName().equals(name))
return methods[j];
}
return null;
}
}
使用方法:
String[] stdOrderListArray = {"olId","olSchCode","coachId","olSubjectState","olTime","olColName"};//复制类的所有属性
CloneTool.copyPropertiesInclude(from,to, stdOrderListArray);
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