由于项目的实际需要,所以利用java反射原理写了一个简单给bean赋值和取值通用的类,在此记录下方便自己日后用到,也为需要的兄弟提供个参考例子。
工具类BeanRefUtil:
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- package com.test;
- import java.lang.reflect.Field;
- import java.lang.reflect.Method;
- import java.text.SimpleDateFormat;
- import java.util.Date;
- import java.util.HashMap;
- import java.util.Locale;
- import java.util.Map;
- /**
- * java bean 反射的方法
- */
- public class BeanRefUtil {
- /**
- * 取Bean的属性和值对应关系的MAP
- * @param bean
- * @return Map
- */
- public static Map<String, String> getFieldValueMap(Object bean) {
- Class<?> cls = bean.getClass();
- Map<String, String> valueMap = new HashMap<String, String>();
- // 取出bean里的所有方法
- Method[] methods = cls.getDeclaredMethods();
- Field[] fields = cls.getDeclaredFields();
- for (Field field : fields) {
- try {
- String fieldType = field.getType().getSimpleName();
- String fieldGetName = parGetName(field.getName());
- if (!checkGetMet(methods, fieldGetName)) {
- continue;
- }
- Method fieldGetMet = cls
- .getMethod(fieldGetName, new Class[] {});
- Object fieldVal = fieldGetMet.invoke(bean, new Object[] {});
- String result = null;
- if ("Date".equals(fieldType)) {
- result = fmtDate((Date) fieldVal);
- } else {
- if (null != fieldVal) {
- result = String.valueOf(fieldVal);
- }
- }
- valueMap.put(field.getName(), result);
- } catch (Exception e) {
- continue;
- }
- }
- return valueMap;
- }
- /**
- * set属性的值到Bean
- * @param bean
- * @param valMap
- */
- public static void setFieldValue(Object bean, Map<String, String> valMap) {
- Class<?> cls = bean.getClass();
- // 取出bean里的所有方法
- Method[] methods = cls.getDeclaredMethods();
- Field[] fields = cls.getDeclaredFields();
- for (Field field : fields) {
- try {
- String fieldSetName = parSetName(field.getName());
- if (!checkSetMet(methods, fieldSetName)) {
- continue;
- }
- Method fieldSetMet = cls.getMethod(fieldSetName, field
- .getType());
- String value = valMap.get(field.getName());
- if (null != value && !"".equals(value)) {
- String fieldType = field.getType().getSimpleName();
- if ("String".equals(fieldType)) {
- fieldSetMet.invoke(bean, value);
- } else if ("Date".equals(fieldType)) {
- Date temp = parseDate(value);
- fieldSetMet.invoke(bean, temp);
- } else if ("Integer".equals(fieldType)
- || "int".equals(fieldType)) {
- Integer intval = Integer.parseInt(value);
- fieldSetMet.invoke(bean, intval);
- } else if ("Long".equalsIgnoreCase(fieldType)) {
- Long temp = Long.parseLong(value);
- fieldSetMet.invoke(bean, temp);
- } else if ("Double".equalsIgnoreCase(fieldType)) {
- Double temp = Double.parseDouble(value);
- fieldSetMet.invoke(bean, temp);
- } else if ("Boolean".equalsIgnoreCase(fieldType)) {
- Boolean temp = Boolean.parseBoolean(value);
- fieldSetMet.invoke(bean, temp);
- } else {
- System.out.println("not supper type" + fieldType);
- }
- }
- } catch (Exception e) {
- continue;
- }
- }
- }
- /**
- * 格式化string为Date
- * @param datestr
- * @return date
- */
- public static Date parseDate(String datestr) {
- if (null == datestr || "".equals(datestr)) {
- return null;
- }
- try {
- String fmtstr = null;
- if (datestr.indexOf(‘:‘) > 0) {
- fmtstr = "yyyy-MM-dd HH:mm:ss";
- } else {
- fmtstr = "yyyy-MM-dd";
- }
- SimpleDateFormat sdf = new SimpleDateFormat(fmtstr, Locale.UK);
- return sdf.parse(datestr);
- } catch (Exception e) {
- return null;
- }
- }
- /**
- * 日期转化为String
- * @param date
- * @return date string
- */
- public static String fmtDate(Date date) {
- if (null == date) {
- return null;
- }
- try {
- SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",
- Locale.US);
- return sdf.format(date);
- } catch (Exception e) {
- return null;
- }
- }
- /**
- * 判断是否存在某属性的 set方法
- * @param methods
- * @param fieldSetMet
- * @return boolean
- */
- public static boolean checkSetMet(Method[] methods, String fieldSetMet) {
- for (Method met : methods) {
- if (fieldSetMet.equals(met.getName())) {
- return true;
- }
- }
- return false;
- }
- /**
- * 判断是否存在某属性的 get方法
- * @param methods
- * @param fieldGetMet
- * @return boolean
- */
- public static boolean checkGetMet(Method[] methods, String fieldGetMet) {
- for (Method met : methods) {
- if (fieldGetMet.equals(met.getName())) {
- return true;
- }
- }
- return false;
- }
- /**
- * 拼接某属性的 get方法
- * @param fieldName
- * @return String
- */
- public static String parGetName(String fieldName) {
- if (null == fieldName || "".equals(fieldName)) {
- return null;
- }
- return "get" + fieldName.substring(0, 1).toUpperCase()
- + fieldName.substring(1);
- }
- /**
- * 拼接在某属性的 set方法
- * @param fieldName
- * @return String
- */
- public static String parSetName(String fieldName) {
- if (null == fieldName || "".equals(fieldName)) {
- return null;
- }
- return "set" + fieldName.substring(0, 1).toUpperCase()
- + fieldName.substring(1);
- }
- }
package com.test; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Locale; import java.util.Map; /** * java bean 反射的方法 */ public class BeanRefUtil { /** * 取Bean的属性和值对应关系的MAP * @param bean * @return Map */ public static Map<String, String> getFieldValueMap(Object bean) { Class<?> cls = bean.getClass(); Map<String, String> valueMap = new HashMap<String, String>(); // 取出bean里的所有方法 Method[] methods = cls.getDeclaredMethods(); Field[] fields = cls.getDeclaredFields(); for (Field field : fields) { try { String fieldType = field.getType().getSimpleName(); String fieldGetName = parGetName(field.getName()); if (!checkGetMet(methods, fieldGetName)) { continue; } Method fieldGetMet = cls .getMethod(fieldGetName, new Class[] {}); Object fieldVal = fieldGetMet.invoke(bean, new Object[] {}); String result = null; if ("Date".equals(fieldType)) { result = fmtDate((Date) fieldVal); } else { if (null != fieldVal) { result = String.valueOf(fieldVal); } } valueMap.put(field.getName(), result); } catch (Exception e) { continue; } } return valueMap; } /** * set属性的值到Bean * @param bean * @param valMap */ public static void setFieldValue(Object bean, Map<String, String> valMap) { Class<?> cls = bean.getClass(); // 取出bean里的所有方法 Method[] methods = cls.getDeclaredMethods(); Field[] fields = cls.getDeclaredFields(); for (Field field : fields) { try { String fieldSetName = parSetName(field.getName()); if (!checkSetMet(methods, fieldSetName)) { continue; } Method fieldSetMet = cls.getMethod(fieldSetName, field .getType()); String value = valMap.get(field.getName()); if (null != value && !"".equals(value)) { String fieldType = field.getType().getSimpleName(); if ("String".equals(fieldType)) { fieldSetMet.invoke(bean, value); } else if ("Date".equals(fieldType)) { Date temp = parseDate(value); fieldSetMet.invoke(bean, temp); } else if ("Integer".equals(fieldType) || "int".equals(fieldType)) { Integer intval = Integer.parseInt(value); fieldSetMet.invoke(bean, intval); } else if ("Long".equalsIgnoreCase(fieldType)) { Long temp = Long.parseLong(value); fieldSetMet.invoke(bean, temp); } else if ("Double".equalsIgnoreCase(fieldType)) { Double temp = Double.parseDouble(value); fieldSetMet.invoke(bean, temp); } else if ("Boolean".equalsIgnoreCase(fieldType)) { Boolean temp = Boolean.parseBoolean(value); fieldSetMet.invoke(bean, temp); } else { System.out.println("not supper type" + fieldType); } } } catch (Exception e) { continue; } } } /** * 格式化string为Date * @param datestr * @return date */ public static Date parseDate(String datestr) { if (null == datestr || "".equals(datestr)) { return null; } try { String fmtstr = null; if (datestr.indexOf(‘:‘) > 0) { fmtstr = "yyyy-MM-dd HH:mm:ss"; } else { fmtstr = "yyyy-MM-dd"; } SimpleDateFormat sdf = new SimpleDateFormat(fmtstr, Locale.UK); return sdf.parse(datestr); } catch (Exception e) { return null; } } /** * 日期转化为String * @param date * @return date string */ public static String fmtDate(Date date) { if (null == date) { return null; } try { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US); return sdf.format(date); } catch (Exception e) { return null; } } /** * 判断是否存在某属性的 set方法 * @param methods * @param fieldSetMet * @return boolean */ public static boolean checkSetMet(Method[] methods, String fieldSetMet) { for (Method met : methods) { if (fieldSetMet.equals(met.getName())) { return true; } } return false; } /** * 判断是否存在某属性的 get方法 * @param methods * @param fieldGetMet * @return boolean */ public static boolean checkGetMet(Method[] methods, String fieldGetMet) { for (Method met : methods) { if (fieldGetMet.equals(met.getName())) { return true; } } return false; } /** * 拼接某属性的 get方法 * @param fieldName * @return String */ public static String parGetName(String fieldName) { if (null == fieldName || "".equals(fieldName)) { return null; } return "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); } /** * 拼接在某属性的 set方法 * @param fieldName * @return String */ public static String parSetName(String fieldName) { if (null == fieldName || "".equals(fieldName)) { return null; } return "set" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); } }
原文地址:https://www.cnblogs.com/jpfss/p/8985623.html
时间: 2024-10-12 08:34:02