通用的java中部分方式实现List＜自定义对象＞转为List＜Map＞

自定义类

/*** @date 2023/12/19 11:20*/
public class Person {private String name;private String sex;public Person() {}public Person(String name, String sex) {this.name = name;this.sex = sex;}public String getName() {return name;}public String getSex() {return sex;}public void setName(String name) {this.name = name;}public void setSex(String sex) {this.sex = sex;}
}

工具模板类

import com.alibaba.fastjson.JSON;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;/*** @date 2023/12/19 11:29*/
public class ListObjToMapUtils<T> {/*** List<自定义对象> 转为 List<Map<String, Object>>** @param objs* @return*/public List<Map<String, Object>> listObjToMap1(List<T> objs) {List<Map<String, Object>> results = new ArrayList<>();objs.forEach(item -> {Map<String, Object> map = null;try {map = (Map<String, Object>) PropertyUtils.describe(item);map.remove("class");} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();}results.add(map);});return results;}/*** List<自定义对象> 转为 List<Map<String, Object>>** @param objs* @return*/public List<Map<String, Object>> listObjToMap2(List<T> objs) {List<Map<String, Object>> results = (List<Map<String, Object>>) JSON.parse(JSON.toJSONString(objs));return results;}/*** List<自定义对象> 转为 List<Map<String, String>>** @param objs* @return*/public List<Map<String, String>> listObjToMap3(List<T> objs) {List<Map<String, String>> results = new ArrayList<>();objs.forEach(item -> {Map<String, String> map = null;try {map = (Map<String, String>) BeanUtils.describe(item);map.remove("class");} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();}results.add(map);});return results;}public static void main(String[] args) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {// Person的修饰符一定要是publicList<Person> personList = new ArrayList<>();Person person1 = new Person("小明", "m");Person person2 = new Person("小红", "f");personList.add(person1);personList.add(person2);// 使用ListObjToMapUtils<Person> listObjToMapUtils = new ListObjToMapUtils<>();long start1 = System.currentTimeMillis();List<Map<String, Object>> results1 = listObjToMapUtils.listObjToMap1(personList);long end1 = System.currentTimeMillis();System.out.println("PropertyUtils.describe方式耗时 " + (end1 - start1) + " 毫秒");long start2 = System.currentTimeMillis();List<Map<String, Object>> results2 = listObjToMapUtils.listObjToMap2(personList);long end2 = System.currentTimeMillis();System.out.println("fastjson方式耗时 " + (end2 - start2) + " 毫秒");long start3 = System.currentTimeMillis();List<Map<String, String>> results3 = listObjToMapUtils.listObjToMap3(personList);long end3 = System.currentTimeMillis();System.out.println("BeanUtils.describe方式耗时 " + (end3 - start3) + " 毫秒");}
}

结果

部分maven依赖

        <dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.12.0</version></dependency><dependency><groupId>commons-lang</groupId><artifactId>commons-lang</artifactId><version>2.6</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.41</version></dependency><dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.9.4</version></dependency>