封装一个BeanUtils工具类,用来操作list中对象,map和对象之间的互转
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2022-05-26 13:59:02
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package com.hf.hantopy.utils;
import org.springframework.util.CollectionUtils;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.*;
/**
* @Description:
* @Date: 2019/3/20
* @Auther:
*/
public class BeanUtils extends org.springframework.beans.BeanUtils {
public BeanUtils() {
}
public static <T> T propertiesCopy(Object source, Class<T> clazz) {
if (null == source) {
return null;
} else {
try {
T obj = clazz.newInstance();
org.springframework.beans.BeanUtils.copyProperties(source, obj);
return obj;
} catch (IllegalAccessException | InstantiationException var3) {
throw new RuntimeException(var3);
}
}
}
/**
* list中对象的copy
* @param source
* @param clazz
* @param <T>
* @return
*/
public static <T> List<T> collectionCopy(Collection source, Class<T> clazz) {
if (null == source) {
return new ArrayList();
} else {
List<T> list = new ArrayList();
Iterator var3 = source.iterator();
while(var3.hasNext()) {
Object o = var3.next();
list.add(propertiesCopy(o, clazz));
}
return list;
}
}
/**
* 将对象转换为map
* @param obj
* @return
*/
public static Map<String, Object> object2Map(Object obj) {
Map<String, Object> map = new HashMap();
if (obj == null) {
return map;
} else {
Class clazz = obj.getClass();
Field[] fields = clazz.getDeclaredFields();
try {
Field[] var4 = fields;
int var5 = fields.length;
for(int var6 = 0; var6 < var5; ++var6) {
Field field = var4[var6];
field.setAccessible(true);
map.put(field.getName(), field.get(obj));
}
return map;
} catch (Exception var8) {
throw new RuntimeException(var8);
}
}
}
/**
* 将map转换为对象,必须保证属性名称相同
* @return
*/
public static Object map2Object(Map<Object,Object> map,Class<?> clzz){
try {
Object target = clzz.newInstance();
if(CollectionUtils.isEmpty(map)){
return target;
}
Field[] fields = clzz.getDeclaredFields();
if(!CollectionUtils.isEmpty(Arrays.asList(fields))){
Arrays.stream(fields).filter((Field field) -> map.containsKey(field.getName())).forEach(var -> {
//获取属性的修饰符
int modifiers = var.getModifiers();
if(Modifier.isStatic(modifiers) || Modifier.isFinal(modifiers)){
//在lambada中结束本次循环是用return,它不支持continue和break
return;
}
//设置权限
var.setAccessible(true);
try {
var.set(target,map.get(var.getName()));
} catch (IllegalAccessException e) {
//属性类型不对,非法操作,跳过本次循环,直接进入下一次循环
throw new RuntimeException(e);
}
});
}
return target;
} catch (InstantiationException | IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
}
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