ObjectTools反射实例-优快云博客

本文深入探讨了Java反射机制的应用，通过ObjectTools类展示了如何获取对象的属性名、属性值及类型信息，提供了获取所有属性值的方法，并通过实例演示了反射在实际开发中的使用。

ObjectTools反射实例

package com.shitou.deposit.chinapnr.utils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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;

/**
 * ObjectTools
 * @author zhouky
 * @since 2018年12月6日
 */
public class ObjectTools {
    private static transient final Log log = LogFactory.getLog("ObjectTools");
    /**
     * 根据属性名获取属性值
     * @param fieldName
     * @param o
     * @return
     */
    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
     * @param o
     * @return
     */
    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;
    }
    /**
     * 获取属性名数组
     * @param o
     * @return
     */
    public List<Map<String, Object>> getFiledsInfo(Object o) {
        Field[] fields = o.getClass().getDeclaredFields();
        List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
        Map<String, Object> infoMap = null;
        for (int i = 0; i < fields.length; i++) {
            if ("serialVersionUID".equals(fields[i].getName()) || "log".equals(fields[i].getName())) {
                continue;
            }
            infoMap = new HashMap<String, Object>();
            infoMap.put("type", fields[i].getType().toString());
            infoMap.put("name", fields[i].getName());
            infoMap.put("value", getFieldValueByName(fields[i].getName(), o));
            list.add(infoMap);
        }
        fields = o.getClass().getSuperclass().getDeclaredFields();
        for (int i = 0; i < fields.length; i++) {
            if ("serialVersionUID".equals(fields[i].getName()) || "log".equals(fields[i].getName()) ||
                    "url".equals(fields[i].getName()) || "cfcaMerCustId".equals(fields[i].getName())) {
                continue;
            }
            infoMap = new HashMap<String, Object>();
            infoMap.put("type", fields[i].getType().toString());
            infoMap.put("name", fields[i].getName());
            infoMap.put("value", getFieldValueByName(fields[i].getName(), o));
            list.add(infoMap);
        }
        fields = o.getClass().getSuperclass().getSuperclass()
                .getDeclaredFields();
        for (int i = 0; i < fields.length; i++) {
            if ("serialVersionUID".equals(fields[i].getName()) || "log".equals(fields[i].getName()) || "url".equals(fields[i].getName())
                    || "cfcaMerCustId".equals(fields[i].getName())) {
                continue;
            }
            infoMap = new HashMap<String, Object>();
            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
     * @param o
     * @return
     */
    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;
    }
}