Object转换成Map(支持驼峰,下划线)

一.Object转换成Map,支持下划线转换成map

　　　　

import com.google.common.base.CaseFormat;
import com.google.common.base.Converter;

class Utils{
     private static Converter<String, String> converter = CaseFormat.LOWER_CAMEL.converterTo(CaseFormat.UPPER_UNDERSCORE);

    //Object转换为Map(实体对象转换成带下划线的map)
    public static Map<String,Object> objToMap(Object obj) throws Exception{
        Map<String,Object> map = new LinkedHashMap<String, Object>();
        Field[] fields = obj.getClass().getDeclaredFields();
        for(Field field : fields){
            field.setAccessible(true);
            map.put(converter.convert(field.getName()) , field.get(obj));
        }
        return map;
    }

}    

二.驼峰与下划线方式名称互相转换工具类

public class CamelUnderlineUtil {
 
    private static final char UNDERLINE ='_';
    public static String camelToUnderline(String param) {
        if (StringUtil.isEmpty(param)) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        int len = param.length();
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (Character.isUpperCase(c)) {
                sb.append(UNDERLINE);
                sb.append(Character.toLowerCase(c));
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }
    
    public static String underlineToCamel(String param){
        if (StringUtil.isEmpty(param)) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        int len = param.length();
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (c==UNDERLINE) {
                if(++i<len){
                    sb.append(Character.toUpperCase(param.charAt(i)));
                }
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }
}

三.Bean对象转Map方法

private Map<String, String> convertObjectToMap(Object obj, Class clazz) throws Exception {
        Map<String, String> dstMap = new HashMap<String, String>();
        Field[] fields = obj.getClass().getDeclaredFields();
        for (Field field : fields) {
            if ("serialVersionUID".equals(field.getName())) {
                continue;
            }
 
            String dstName = CamelUnderlineUtil.camelToUnderline(field.getName());
            PropertyDescriptor pd;
            pd = new PropertyDescriptor(field.getName(), clazz);
            Method method = pd.getReadMethod();
            Object dstObject = method.invoke(obj);
            if (dstObject instanceof Date) {
                dstObject = convertToTimeStamp16((Date) dstObject);
            }
            if (dstObject instanceof ArrayList) {
                dstObject = "";
            }
            dstMap.put(dstName, StringUtil.isEmpty(dstObject) ? "" : dstObject.toString());
        }
        return dstMap;
    }

 四.map转bean，bean转map(不带下划线转换)

　　1.实体对象转换成Map

/**
     * 实体对象转成Map
     *
     * @param obj 实体对象
     * @return
     */
    public static Map<String, Object> object2Map(Object obj) {
        Map<String, Object> map = new HashMap<>();
        if (obj == null) {
            return map;
        }
        Class clazz = obj.getClass();
        Field[] fields = clazz.getDeclaredFields();
        try {
            for (Field field : fields) {
                field.setAccessible(true);
                map.put(field.getName(), field.get(obj));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return map;
    }

　　2.Map转换成实体对象

    /**
     * Map转成实体对象
     *
     * @param map   实体对象包含属性
     * @param clazz 实体对象类型
     * @return
     */
    public static Object map2Object(Map<String, Object> map, Class<?> clazz) {
        if (map == null) {
            return null;
        }
        Object obj = null;
        try {
            obj = clazz.newInstance();

            Field[] fields = obj.getClass().getDeclaredFields();
            for (Field field : fields) {
                int mod = field.getModifiers();
                if (Modifier.isStatic(mod) || Modifier.isFinal(mod)) {
                    continue;
                }
                field.setAccessible(true);
                field.set(obj, map.get(field.getName()));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return obj;
    }