Java 处理Object对象

原文：https://www.cnblogs.com/jf8710/articles/9657920.html

package com.jf.ftp;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

public class ObjectUtil {

    private static Logger log = Logger.getLogger(NewFtpUtil.class);
    
    /**
    * 根据属性名获取属性值
    * */
    private Object getFieldValueByName(String fieldName, Object o) {
        try {
            String firstLetter = fieldName.substring(0, 1).toUpperCase();
            String getter = "get" + firstLetter + fieldName.substring(1);
            Method method = o.getClass().getMethod(getter, new Class[] {});
            Object value = method.invoke(o, new Object[] {});
            return value;
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            return null;
        }
    }
    
    /**
    * 获取属性名数组
    * */
    private String[] getFiledName(Object o) {
        Field[] fields = o.getClass().getDeclaredFields();
        String[] fieldNames = new String[fields.length];
        for (int i = 0; i < fields.length; i++) {
            System.out.println(fields[i].getType());
            fieldNames[i] = fields[i].getName();
        }
        return fieldNames;
    }
    
    /**
    * 获取属性类型(type)，属性名(name)，属性值(value)的map组成的list
    * */
    private List getFiledsInfo(Object o) {
        Field[] fields = o.getClass().getDeclaredFields();
        String[] fieldNames = new String[fields.length];
        List list = new ArrayList();
        Map infoMap = null;
        for (int i = 0; i < fields.length; i++) {
            infoMap = new HashMap();
            infoMap.put("type", fields[i].getType().toString());
            infoMap.put("name", fields[i].getName());
            infoMap.put("value", getFieldValueByName(fields[i].getName(), o));
            list.add(infoMap);
        }
        return list;
    }
    
    /**
    * 获取对象的所有属性值，返回一个对象数组
    * */
    public Object[] getFiledValues(Object o) {
        String[] fieldNames = this.getFiledName(o);
        Object[] value = new Object[fieldNames.length];
        for (int i = 0; i < fieldNames.length; i++) {
            value[i] = this.getFieldValueByName(fieldNames[i], o);
        }
        return value;
    }
}