Java如何获取对象属性及对应值

利用反射获取对象的所有属性及对应的值

1、获取属性名数组

private static String[] getFiledName(Object o) { Field[] fields = o.getClass().getDeclaredFields(); String[] fieldNames = new String[fields.length]; for (int i = 0; i < fields.length; i++) { fieldNames[i] = fields[i].getName(); } return fieldNames; }

2、根据属性名获取属性值

private static 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) { logger.error('获取属性值失败！' + e, e); } return null; }

3、获取属性的数据类型

private static Object getFiledType(String fieldName, Object o) { Field[] fields = o.getClass().getDeclaredFields(); for (Field field : fields) { if (Objects.equals(fieldName, field.getName())) {return field.getType(); } } return null; }

4、完整代码及其引入的包

package com.hao.search;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.Objects;import org.apache.commons.collections.CollectionUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import com.google.common.base.Joiner;public class ObjectPaseUtils { private static Logger logger = LoggerFactory.getLogger(ObjectPaseUtils.class); /** * @desc 将对象转换成指定String * @param <T> * @param t * @return */ public static <T> String objectToStr(T t) { List<String> list = new ArrayList<String>(); String[] fieldNames = getFiledName(t); for (int i = 0; i < fieldNames.length; i++) { String name = fieldNames[i]; Object value = getFieldValueByName(name, t); if (null != value) {if (getFiledType(name, t).equals(Date.class)) { value = new SimpleDateFormat('yyyy-MM-dd HH:mm:ss').format((Date)value);}list.add(name + ' : ' + value); } } if (CollectionUtils.isNotEmpty(list)) { return Joiner.on('r').skipNulls().join(list); } return null; } /** * @desc 获取属性名数组 * @param o * @return */ private static String[] getFiledName(Object o) { Field[] fields = o.getClass().getDeclaredFields(); String[] fieldNames = new String[fields.length]; for (int i = 0; i < fields.length; i++) { fieldNames[i] = fields[i].getName(); } return fieldNames; } /** * @desc 根据属性名获取属性值 * @param fieldName * @param o * @return */ private static 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) { logger.error('获取属性值失败！' + e, e); } return null; } /** * @desc 获取属性的数据类型 * @param fieldName * @param o * @return */ private static Object getFiledType(String fieldName, Object o) { Field[] fields = o.getClass().getDeclaredFields(); for (Field field : fields) { if (Objects.equals(fieldName, field.getName())) {return field.getType(); } } return null; }}

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