Bean与Map转换工具类详解

1. 概述

本文将详细介绍两个核心功能：Bean转Map与Map转Bean。通过代码示例和对注解的解读，阐述实现原理与应用场景。

2. Bean转Map

2.1 方法说明

public static Map
   
     bean2Map(T source) throws IllegalAccessException {    Map
    
      result = new HashMap<>();    Class
     
       sourceClass = source.getClass();    Field[] sourceFields = sourceClass.getDeclaredFields();        for (Field field : sourceFields) {        field.setAccessible(true);        FieldName fieldNameAnnotation = field.getAnnotation(FieldName.class);                if (fieldNameAnnotation == null) {            result.put(field.getName(), field.get(source));        } else {            if (!fieldNameAnnotation.Ignore()) {                String headerName = fieldNameAnnotation.value();                result.put(headerName, field.get(source));            }        }    }        return result;}

2.2 注解解读

@FieldName注解用于自定义字段名，支持忽略某些字段。字段名默认为空，忽略标志默认为false。

3. Map转Bean

3.1 方法说明

public static T map2Bean(Map
   
     source, Class
    
      instance) {    try {        T object = instance.newInstance();        Field[] fields = object.getClass().getDeclaredFields();                for (Field field : fields) {            field.setAccessible(true);            FieldName fieldNameAnnotation = field.getAnnotation(FieldName.class);                        if (fieldNameAnnotation != null) {                String headerName = fieldNameAnnotation.value();                Object value = source.get(headerName);                field.set(object, value);            } else {                String fieldName = field.getName();                Object value = source.get(fieldName);                field.set(object, value);            }        }                return object;    } catch (InstantiationException | IllegalAccessException e) {        e.printStackTrace();    }    return null;}