Java对象转Map

在和外部系统对接时，对方系统提供的SDK方法入参全是Map，没办法，只能想办法把对象转成Map。这里，借助了hutool的工具类，可以方便的通过反射获取对象的属性。引入hutool的maven配置：

        <dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.4.1</version></dependency>

工具类代码如下：

import cn.hutool.core.bean.BeanDesc;
import cn.hutool.core.bean.BeanUtil;import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;public class BeanConvertUtils {public static Map<String, String> beanToMap(Object bean) {Map<String, String> targetMap = new HashMap<>();if (bean == null) {return null;}//获取类的属性描述final Collection<BeanDesc.PropDesc> props = BeanUtil.getBeanDesc(bean.getClass()).getProps();String key;Method getter;Object value;for (BeanDesc.PropDesc prop : props) {key = prop.getFieldName();// 过滤class属性// 得到property对应的getter方法getter = prop.getGetter();if (null != getter) {// 只读取有getter方法的属性try {value = getter.invoke(bean);} catch (Exception ignore) {continue;}//如果是集合特殊处理if (value != null && value instanceof Collection) {listToMap(targetMap, (Collection<Object>) value, key);continue;}if (value != null && false == value.equals(bean)) {targetMap.put(key, null == value ? null : String.valueOf(value));}}}return targetMap;}private static Map<String, String> listToMap(Map<String, String> targetMap, Collection<Object> collection, String fieldName) {int i = 0;for (Object bean : collection) {Map<String, String> tempMap = beanToMap(bean);for (String key : tempMap.keySet()) {targetMap.put(fieldName + "[" + i + "]." + key, tempMap.get(key));}i++;}return targetMap;}
}

写一个测试类，测试一下：

import org.junit.Test;import java.util.ArrayList;
import java.util.List;public class BeanConvertUtilsTest {@Testpublic void beanToMapTest() {Student student = new Student();student.setNumber("2023120121");student.setName("李磊");Course course = new Course();course.setName("语文");course.setScore("90");student.addCourse(course);course = new Course();course.setName("数学");course.setScore("85");student.addCourse(course);System.out.println(BeanConvertUtils.beanToMap(student));}private class Student {private String number;private String name;private List<Course> courses;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getNumber() {return number;}public void setNumber(String number) {this.number = number;}public List<Course> getCourses() {return courses;}public void setCourses(List<Course> courses) {this.courses = courses;}public void addCourse(Course course) {if (courses == null) {courses = new ArrayList<>();}courses.add(course);}}private class Course {private String name;private String score;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getScore() {return score;}public void setScore(String score) {this.score = score;}}
}

跑一下看结果：