搭建网站的英语,企业的网站品牌推广,wordpress跟换域名图片不显示,山东通app官网下载二维码在实际的项目开发中#xff0c;反射操作类的实例、属性赋值、执行方法是常规的操作#xff0c;虽然spring提供了比较完整的API来执行上述操作#xff0c;不过在实际的应用中#xff0c;spring的函数隐藏比较深#xff0c;比较分散#xff0c;小伙伴们可能懒得花时间去寻找…在实际的项目开发中反射操作类的实例、属性赋值、执行方法是常规的操作虽然spring提供了比较完整的API来执行上述操作不过在实际的应用中spring的函数隐藏比较深比较分散小伙伴们可能懒得花时间去寻找。本类集成了一些常规操作值得收藏请关注展翅展翅会定时更新有项目实战价值的代码和技术。import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Set;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import org.apache.commons.beanutils.PropertyUtils;import org.springframework.util.ObjectUtils;import com.esotericsoftware.reflectasm.MethodAccess;import com.ivt.monitor.utils.common.CommonUtils;import com.ivt.monitor.utils.common.StringUtil;public class ReflectASMUtils {/** * Class,MethodAccess的缓存map */private static Map, MethodAccess classMethodAccessMap;static{classMethodAccessMap new HashMap, MethodAccess();}/** * 根据字段名获取对应的bean的值 * 为了避免因为bean的set,get不规范而出异常,加上PropertyUtils.getProperty(bean, field); * param bean * param field * return * throws NoSuchMethodException * throws InvocationTargetException * throws IllegalAccessException */public static Object getProperty(Object bean, String field) throws IllegalAccessException,InvocationTargetException, NoSuchMethodException{try{Class clazz bean.getClass(); String methodName get.concat(field.substring(0, 1).toUpperCase().concat(field.substring(1, field.length())));MethodAccess access getCacheMethodAccess(clazz);Object obj access.invoke(bean, methodName);/*if(obj ! null obj instanceof Date){obj CommonUtils.getDateString((Date) obj);}*/return obj;}catch (Exception e) {return PropertyUtils.getProperty(bean, field);}}/** * 根据字段名为bean设置对应的值 * 为了避免因为bean的set,get不规范而出异常,加上PropertyUtils.setProperty(bean, field, value); * param bean * param field * param value * throws NoSuchMethodException * throws InvocationTargetException * throws IllegalAccessException */public static void setProperty(Object bean, String field, Object value) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException{try{Class clazz bean.getClass(); String methodName set.concat(field.substring(0, 1).toUpperCase().concat(field.substring(1, field.length())));MethodAccess access getCacheMethodAccess(clazz);access.invoke(bean, methodName, value);}catch (Exception e) {PropertyUtils.setProperty(bean, field, value);}}/** * map返回成一个bean * param clazz * param map * return */public static T setBeanValue(Class clazz, Map map){try{T bean clazz.newInstance();if(bean null || CommonUtils.isCollectionEmpty(map)){return null;}Set keys map.keySet();for(String field : keys){String methodName set.concat(field.substring(0, 1).toUpperCase().concat(field.substring(1, field.length())));MethodAccess access getCacheMethodAccess(clazz);access.invoke(bean, methodName, map.get(field));}return bean;}catch(Exception e){return null;}}/** * mapList返回成一个bean list * param clazz * param mapList * return */public static List setBeanListValue(Class clazz, List mapList){if(clazz null || CommonUtils.isCollectionEmpty(mapList)){return null;}List list new ArrayList();for(Map map : mapList){list.add(setBeanValue(clazz, map));}return list;}/** * 获取bean所有字段的json * param bean * return */public static JSONObject getBeanJSONObjectByField(Object bean){JSONObject json new JSONObject();List fieldList getFieldNameList(bean);if(CommonUtils.isCollectionEmpty(fieldList)){return json;}Object obj null;for(String field : fieldList){try {obj getProperty(bean, field);} catch (Exception e) {} json.put(field, obj);}return json;}/** * app获取bean所有字段的json * param bean * return */public static JSONObject getBeanJSONObjectByFieldForApp(Object bean){/*Gson gson new GsonBuilder().serializeNulls().create();String gsonString gson.toJson(bean);return JSONObject.fromObject(gsonString);*/JSONObject json new JSONObject();List fieldList getFieldNameList(bean);if(CommonUtils.isCollectionEmpty(fieldList)){return json;}Object obj null;for(String field : fieldList){try {obj getPropertyForApp(bean, field);} catch (Exception e) {} json.put(field, obj);}return json;}/** * 根据JsonConfig,获取bean指定字段的json * param bean * param config * param fields * return */public static JSONObject getBeanJSONObjectByField(Object bean, JsonConfig config, String ... fields){JSONObject json JSONObject.fromObject(bean, config);if(CommonUtils.isCollectionEmpty(fields)){return json;}JSONObject retJson new JSONObject();Object obj null;for(String field : fields){obj json.get(field);retJson.put(field, obj);}return retJson;}/** * 获取bean指定字段的json * param bean * param fields * return */public static JSONObject getBeanJSONObjectByField(Object bean, String ... fields){JSONObject json new JSONObject();if(CommonUtils.isCollectionEmpty(fields)){return json;}Object obj null;for(String field : fields){try {obj getProperty(bean, field);} catch (Exception e) {} json.put(field, obj);}return json;}/** * 获取bean所有的get方法的json,key为对应的生成的字段 * param bean * return */public static JSONObject getBeanJSONObjectByMethod(Object bean){JSONObject json new JSONObject();List getMethodList getGetMethodNameList(bean);if(CommonUtils.isCollectionEmpty(getMethodList)){return json;}Class clazz bean.getClass();String key ;String value ;MethodAccess access null;Object obj null;for(String methodName : getMethodList){key methodName.substring(3, 4).toLowerCase().concat(methodName.substring(4, methodName.length()));if(StringUtil.isStrEmpty(key)){continue;}access getCacheMethodAccess(clazz);obj access.invoke(bean, methodName);if(obj ! null obj instanceof Date){value StringUtil.getDateString((Date) obj); //除了日期,其他都利用spring的帮助类}else{value ObjectUtils.getDisplayString(obj); //利用spring的帮助类}json.put(key, value);}return json;}/** * 给JSONObject对应的值增加前缀 * param json * param map * return */public static JSONObject setUpPrefix(JSONObject json, Map map){if(CommonUtils.isCollectionEmpty(map)){return json;}Set keys map.keySet();Object value null;for(String key : keys){value json.get(key);if(value ! null !.equals(value.toString())){json.put(key, map.get(key) value);}}return json;}///** * 根据JsonConfig,获取bean list指定字段的JSONArray * param beanList * param config * param fields * return */public static JSONArray getBeanListJSONArrayByField(List beanList, JsonConfig config, String ... fields){JSONArray array new JSONArray();if(CommonUtils.isCollectionEmpty(beanList) || CommonUtils.isCollectionEmpty(fields)){return array;}for(Object bean : beanList){array.add(getBeanJSONObjectByField(bean, config, fields));}return array;}/** * 获取bean list 的JSON数组 * param beanList * param fields * return */public static JSONArray getBeanListJSONArray(List beanList){JSONArray array new JSONArray();if(CommonUtils.isCollectionEmpty(beanList)){return array;}for(Object bean : beanList){array.add(JSONObject.fromObject(bean));}return array;}/** * 获取bean list指定字段的JSONArray * param beanList * param fields * return */public static JSONArray getBeanListJSONArrayByField(List beanList, String ... fields){JSONArray array new JSONArray();if(CommonUtils.isCollectionEmpty(beanList) || CommonUtils.isCollectionEmpty(fields)){return array;}for(Object bean : beanList){array.add(getBeanJSONObjectByField(bean, fields));}return array;}/** * app获取bean list指定字段的JSONArray * param beanList * param fields * return */public static JSONArray getBeanListJSONArrayByFieldForApp(List beanList, String ... fields){JSONArray array new JSONArray();if(CommonUtils.isCollectionEmpty(beanList) || CommonUtils.isCollectionEmpty(fields)){return array;}for(Object bean : beanList){array.add(getBeanJSONObjectByFieldForApp(bean, fields));}return array;}/** * 获取bean list所有的get方法的JSONArray * param beanList * return */public static JSONArray getBeanListJSONArrayByMethod(List beanList){JSONArray array new JSONArray();if(CommonUtils.isCollectionEmpty(beanList)){return array;}for(Object bean : beanList){array.add(getBeanJSONObjectByField(bean));}return array;}/** * 给JSONArray对应的值增加前缀 * param array * param map * return */public static JSONArray setUpPrefix(JSONArray array, Map map){if(CommonUtils.isCollectionEmpty(map)){return array;}int size array.size();if(size 0){return array;}JSONObject json null;for(int i0; i getFieldNameList(Object bean){Class clazz bean.getClass();Field[] implFs clazz.getDeclaredFields(); //实现类,也就是本身的字段List fieldNameList new ArrayList();String name ;for(Field fs : implFs){name fs.getName();if((serialVersionUID).equalsIgnoreCase(name))continue;fieldNameList.add(name);}return fieldNameList;}/** * 获取所有的方法 * param name * return */private static List getGetMethodNameList(Object bean){List getMethodList new ArrayList();Class clazz bean.getClass();Method[] mds clazz.getMethods();String name null;for(Method md : mds){name md.getName();if(name.startsWith(get) !getClass.equalsIgnoreCase(name)){getMethodList.add(name);}}return getMethodList;}/** * 因为MethodAccess.get(clazz);比较耗时,所以缓存起来 * param clazz * return */private static MethodAccess getCacheMethodAccess(Class clazz){MethodAccess obj classMethodAccessMap.get(clazz);if(obj null){MethodAccess access MethodAccess.get(clazz);classMethodAccessMap.put(clazz, access);return access;}return obj;}/** * 获取bean指定字段的json * param bean * param fields * return */public static JSONObject getBeanJSONObjectByFieldForApp(Object bean, String ... fields){JSONObject json new JSONObject();if(CommonUtils.isCollectionEmpty(fields)){return json;}Object obj null;for(String field : fields){try {obj getPropertyForApp(bean, field);} catch (Exception e) {} json.put(field, obj);}return json;}/** * app的日期返回long * param bean * param field * return * throws IllegalAccessException * throws InvocationTargetException * throws NoSuchMethodException */private static Object getPropertyForApp(Object bean, String field) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException{try{Class clazz bean.getClass(); String methodName get.concat(field.substring(0, 1).toUpperCase().concat(field.substring(1, field.length())));MethodAccess access getCacheMethodAccess(clazz);Object obj access.invoke(bean, methodName);if(obj ! null obj instanceof java.util.Date){obj new Long(((Date) obj).getTime());}if(obj null){//获取字段的类型Field _field clazz.getDeclaredField(field); Class fieldType _field.getType(); if(fieldType Number.class || fieldType.getSuperclass() Number.class || fieldType java.util.Date.class || fieldType java.sql.Date.class){ obj 0; }else{ obj ; }}return obj;}catch (Exception e) {return PropertyUtils.getProperty(bean, field);}}}
