给实体对象属性的空值赋默认值
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private final String defaultStr = "" ; private final Date defaultDate = new Date(); private final BigDecimal defaultDecimal = new BigDecimal( 0 ); private final Timestamp defaultTimestamp= new Timestamp( new Date().getTime()); //赋默认值 public void setDefaultValue(Object object) { try { Class clazz = object.getClass(); Field[] fields = clazz.getDeclaredFields(); String primaryKey = EntityUtil.getPrimaryKey(currentSession(), object.getClass()); for ( int i= 0 ;i<fields.length;i++){ Field field = fields[i]; String fieldName = field.getName(); Class fieldClass=field.getType(); field.setAccessible( true ); //设置访问权限 if (!fieldName.equals(primaryKey) && isFieldValueNull(fieldName,object)){ if (fieldClass == Integer. class ) { field.set(object, defaultDecimal.intValue()); } else if (fieldClass == Long. class ) { field.set(object, defaultDecimal.longValue()); } else if (fieldClass == Float. class ) { field.set(object, defaultDecimal.doubleValue()); } else if (fieldClass == BigDecimal. class ) { field.set(object, defaultDecimal); } else if (fieldClass == Date. class ) { field.set(object, defaultDate); } else if (fieldClass == String. class ){ field.set(object, defaultStr); // 设置值 } else if (fieldClass == Timestamp. class ){ field.set(object, defaultTimestamp); } } else if (fieldName.equals(primaryKey) && isStringFieldValueNull(fieldName,object,fieldClass)){ //MySQL，需要对对主键做特殊处理 field.set(object, null ); } } } catch (Exception e) { e.printStackTrace(); System.out.println(e.getMessage()); } }
//判断字段是否为空 private boolean isFieldValueNull(String fieldName, Object object) throws ClassNotFoundException { boolean isNUll= false ; try { String firstLetter = fieldName.substring( 0 , 1 ).toUpperCase(); String getter = "get" + firstLetter + fieldName.substring( 1 ); Method method = object.getClass().getMethod(getter, new Class[] {}); Object value = method.invoke(object, new Object[] {}); if (value== null ){ isNUll= true ; } return isNUll; } catch (Exception e) { return isNUll; } }
//判断主键是否为空值 private boolean isStringFieldValueNull(String fieldName, Object object, Class fieldClass) throws ClassNotFoundException { boolean isNUll= false ; try { String firstLetter = fieldName.substring( 0 , 1 ).toUpperCase(); String getter = "get" + firstLetter + fieldName.substring( 1 ); Method method = object.getClass().getMethod(getter, new Class[] {}); Object value = method.invoke(object, new Object[] {}); if (value== null ){ isNUll= true ; } else { if (fieldClass == String. class && StringUtils.isBlank((String)value)) { isNUll= true ; } } return isNUll; } catch (Exception e) { return isNUll; } } |
给实体类赋默认值通用方法
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package com.clamc测试数据mon.util; import java.lang.reflect.Field; import java.lang.reflect.Modifier; import java.math.BigDecimal; import java.sql.Date; import java.sql.Timestamp; import java.util.ArrayList; import java.util.List; /** * yangzhiwei * 使用反射给实体类k赋值（默认值） * insert update会报null异常，为空时不能插入和更新 */ public class ObjInvoke { public static Object getObjDefault(Object obj) { // 得到类对象 Class objCla = obj.getClass(); Field[] fs = objCla.getDeclaredFields(); for ( int i = 0 ; i < fs.length; i++) { Field f = fs[i]; // 设置些属性是可以访问的 boolean isStatic = Modifier.isStatic(f.getModifiers()); if (isStatic){ continue ; } // 设置些属性是可以访问的 f.setAccessible( true ); try { // 得到此属性的值 Object val = f.get(obj); // 得到此属性的类型 String type = f.getType().toString(); if (type.endsWith( "String" ) && val == null ) { // 给属性设值 f.set(obj, "" ); } else if ((type.endsWith( "int" ) || type.endsWith( "Integer" ) || type.endsWith( "double" )) && val == null ) { f.set(obj, 0 ); } else if ((type.endsWith( "long" )|| type.endsWith( "Long" ) )&& val == null ){ f.set(obj, 0L); } else if (type.endsWith( "Date" ) && val == null ) { f.set(obj, Date.valueOf( "1970-01-01" )); } else if (type.endsWith( "Timestamp" ) && val == null ){ f.set(obj, Timestamp.valueOf( "1970-01-01 0" )); } else if (type.endsWith( "BigDecimal" ) && val == null ) { f.set(obj, new BigDecimal( 0 )); } } catch (Exception e) { e.printStackTrace(); } } return obj; } public static List getObjDefaultList(List objList) { List list= new ArrayList(); for (Object t:objList){ list.add(getObjDefault(t)); } return list; } } |
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
原文链接：https://blog.csdn.net/qq_33734094/article/details/80450586
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