hibernate 只需要操作对象就可以对数据库的数据进行“增删改查”。用了短时间后，感觉依旧存在很大的冗余。正因为这个，我的反射框架就出现了。因为自用，下面只贴出代码，不做解释。有兴趣的可以来看看一起研究一下，如有问题可私聊探讨。
反射基类 SQLSuper
/** * 给对象做反射并且定于返回HQL语句方法的抽象类 * @author vincent Mao * */ public abstract class SQLSuper { /** * */ protected StringBuffer SQL; public StringBuffer getSQL() { return SQL; } public void setSQL(StringBuffer sQL) { SQL = sQL; } /** * 根据传入的实体对象and条件集合and排序对象返回HQL语句 * @param obj 经过重新封装的实体类 * @param condition 条件集合 * @param orderBy 排序对象 * @return HQL */ public abstract String getSQL(Object obj , List condition,OrderBy orderBy); /** * 返回所有类的名字 * @param tables * @return List<String> */ protected List<String> getClassNames(List<?> tables){ List<String> classNames = null; if(tables != null && tables.size()!=0){ classNames = new ArrayList<String>(); for(Object obj : tables){ classNames.add(obj.getClass().getSimpleName()); } } return classNames; } /** * 返回类的名字 * @param table * @return */ protected String getClassName(Object table){ String className = null; if(table != null){ className=table.getClass().getSimpleName(); } return className; } /** * 给传入的对象做反射 * @param o * @return */ protected Class<?> getClassReverberate(Object o){ String ClassName = o.getClass().getName(); Class<?> demo = null; try { demo = Class.forName(ClassName); } catch (Exception e) { e.printStackTrace(); } return demo; } /** * 返回类中的所有属性 * @param o * @return List<String> */ public List<String> getClassPropertyName(Object o) { Class<?> demo = this.getClassReverberate(o); List<String> classPropertyNames = null; Field[] field = demo.getDeclaredFields(); classPropertyNames = new ArrayList<String>(); for (int i = 0; i < field.length; i++) { classPropertyNames.add(field[i].getName()); } return classPropertyNames; } /** * 返回类中所有属性数据类型 * @param c * @return */ public List<Class<?>> getClassPropertyType(Class<?> c){ List<Class<?>> classPropertyTypes = null; Field[] field = c.getDeclaredFields(); classPropertyTypes = new ArrayList<Class<?>>(); for (int i = 0; i < field.length; i++) { classPropertyTypes.add(field[i].getType()); } return classPropertyTypes; } /** * 返回类中的所有属性和属性数据类型 * @param c * @return */ public Map<String, Class<?>> getClassPropertyNameAndType(Class<?> c){ Map<String, Class<?>> classPropertyNamesAndTypes = null; Field[] field = c.getDeclaredFields(); classPropertyNamesAndTypes = new HashMap<String, Class<?>>(); for (int i = 0; i < field.length; i++) { classPropertyNamesAndTypes.put(field[i].getName(),field[i].getType()); } return classPropertyNamesAndTypes; } /** * 使用反射调用对象的get方法 * @param obj * 操作的对象 * @param att * 操作的属性 * */ public Object getter(Object obj, String att) { try { Method method = obj.getClass().getMethod("get" + firstLower(att)); return method.invoke(obj); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 使用反射调用对象的set方法 * @param obj * 操作的对象 * @param att * 操作的属性 * @param value * 设置的值 * @param type * 参数的属性 * */ public void setter(Object obj, String att, Object value, Class<?> type) { try { Method method = obj.getClass().getMethod("set" + firstLower(att), type); method.invoke(obj, value); } catch (Exception e) { e.printStackTrace(); } } /** * 给setter()的操作的属性首字母大写 * @param att setter()操作的属性 * @return */ protected String firstLower(String att) { StringBuffer sb = new StringBuffer(); sb.append(att.substring(0,1).toUpperCase()); sb.append(att.substring(1, att.length())); return sb.toString(); } }
反射使用类 SQLUtil
/** * 返回HQL语句的工具类，实现SQLSuper抽象类 * @author vincent Mao * */ public class SQLUtil extends SQLSuper { /** * 根据传入实体，条件集合，排序实体生成对应的HQL */ public String getSQL(Object detachedObject , List condition ,OrderBy orderBy) { /*if(condition == null){ condition = new ArrayList(); }*/ StringBuffer sb = new StringBuffer(); sb.append(" from "); sb.append(this.getClassName(detachedObject)); //sb.append(" where "); StringBuffer conditionSQL = new StringBuffer(); List<String> classPropertyNames = this.getClassPropertyName(detachedObject); for (String classPropertyName : classPropertyNames) { Object detachedObjectPropertyValue = this.getter(detachedObject, classPropertyName.toString()); if (detachedObjectPropertyValue == null || detachedObjectPropertyValue.equals("-1") || detachedObjectPropertyValue.toString().equals("-1")) { continue; } /*if (i > 0) { conditionSQL.append(" and "); }*/ if(detachedObjectPropertyValue instanceof List){ //Object[] array = (Object[])detachedObjectPropertyValue; //Array array = (Array) detachedObjectPropertyValue; List array = (List) detachedObjectPropertyValue; if(array.size()==1){ conditionSQL.append(classPropertyName.replace('_', '.')+" > ?"); condition.add(array.get(0)); }else if(array.size()==2){ conditionSQL.append(classPropertyName.replace('_', '.')+" between ? and ?"); condition.add(array.get(0)); condition.add(array.get(1)); } }else if(detachedObjectPropertyValue instanceof Set){ continue; }else{ SQLWhereEntity whereEntity = new SQLWhereEntity(); String whereEntityHQL = whereEntity.matchingEntity(detachedObjectPropertyValue,condition); if(whereEntityHQL!=null){ conditionSQL.append(classPropertyName.replace('_', '.')+" in "+"("+whereEntityHQL+")"); }else{ conditionSQL.append(classPropertyName.replace('_', '.')+" = ? "); condition.add(detachedObjectPropertyValue); } } conditionSQL.append(" and "); } if(conditionSQL.toString().length()>0){ sb.append(" where "); sb.append(conditionSQL.toString()); sb.delete(sb.lastIndexOf("and"), sb.length()); } if(orderBy!=null){ sb.append(" order by "); sb.append(orderBy.getColumn()); sb.append(" "); sb.append(orderBy.getType()); } System.out.println(sb.toString()); for (Object o : condition) { System.out.println(o); } return sb.toString(); } /** * 返回准备update的对象 * 操作非null的字段，八大基本数据类型加上String和Byte如果为相同则continue * @param detachedObject * @param persistentObject * @return */ public Object getUpdateObject(Object detachedObject,Object persistentObject){ if(detachedObject == persistentObject){ return detachedObject; } detachedObject = this.getAddObject(detachedObject); //Object persistentObject = this.get((Serializable) this.getter(detachedObject, "uuid")); List<String> classPropertyNames = this.getClassPropertyName(detachedObject); for(String classPropertyName : classPropertyNames){ Object detachedObjectPropertyValue = this.getter(detachedObject, classPropertyName); if (detachedObjectPropertyValue == null || detachedObjectPropertyValue.equals("-1") || detachedObjectPropertyValue.toString().equals("-1")) { continue; } if(detachedObjectPropertyValue instanceof List){ continue; }else if(detachedObjectPropertyValue instanceof Set){ Object persistentObjectPropertyValue = this.getter(persistentObject, classPropertyName); for(Object obj : (Set)detachedObjectPropertyValue){ ((Set)persistentObjectPropertyValue).add(obj); } continue; }else{ Object persistentObjectPropertyValue = this.getter(persistentObject, classPropertyName); if(persistentObjectPropertyValue!=null){ if(persistentObjectPropertyValue instanceof Object){ if(persistentObjectPropertyValue instanceof Integer){ if(Integer.parseInt(persistentObjectPropertyValue.toString()) == Integer.parseInt(detachedObjectPropertyValue.toString())){ continue; } }else if(persistentObjectPropertyValue instanceof String){ if(persistentObjectPropertyValue.toString().trim().equals(detachedObjectPropertyValue.toString().trim())){ continue; } }else if(persistentObjectPropertyValue instanceof Double){ if(Double.parseDouble(persistentObjectPropertyValue.toString()) == Double.parseDouble(detachedObjectPropertyValue.toString())){ continue; } }else if(persistentObjectPropertyValue instanceof Date){ if(((Date)persistentObjectPropertyValue)== (Date)detachedObjectPropertyValue){ continue; } }else if(persistentObjectPropertyValue instanceof Short){ if((Short.parseShort(persistentObjectPropertyValue.toString()))== Short.parseShort(detachedObjectPropertyValue.toString())){ continue; } }else if(persistentObjectPropertyValue instanceof Boolean){ if((Boolean.parseBoolean(persistentObjectPropertyValue.toString()))== Boolean.parseBoolean(detachedObjectPropertyValue.toString())){ continue; } }else if(persistentObjectPropertyValue instanceof Byte){ if((Byte.parseByte(persistentObjectPropertyValue.toString()))== Byte.parseByte(detachedObjectPropertyValue.toString())){ continue; } }else if(persistentObjectPropertyValue instanceof Long){ if((Long.parseLong(persistentObjectPropertyValue.toString()))== Long.parseLong(detachedObjectPropertyValue.toString())){ continue; } }else if(persistentObjectPropertyValue instanceof Float){ if((Float.parseFloat(persistentObjectPropertyValue.toString()))== Float.parseFloat(detachedObjectPropertyValue.toString())){ continue; } }else if(persistentObjectPropertyValue instanceof Character){ if((Character)persistentObjectPropertyValue== (Character)detachedObjectPropertyValue){ continue; } }else{ } /*else if(persistentObjectPropertyValue instanceof Serializable){ }*/ } } System.out.println(classPropertyName+"&&"+detachedObjectPropertyValue.toString().trim()+"&&"+detachedObjectPropertyValue.getClass()); this.setter(persistentObject, classPropertyName, detachedObjectPropertyValue, detachedObjectPropertyValue.getClass()); } } return persistentObject; } /** * json-lib用，返回不需要生成json的字段 * @param detachedObjectClass 类 * @param level 级别通常为2级 * @return */ public List<String> getIgnoreObjectName(Class<?> detachedObjectClass,int level){ int levelCount = 1; List<String> ignoreObjectNames = new ArrayList<String>(); if(detachedObjectClass!=null){ Map<String,Class<?>> classPropertyNamesAndTypes = this.getClassPropertyNameAndType(detachedObjectClass); for(String classPropertyName : classPropertyNamesAndTypes.keySet()){ if(classPropertyNamesAndTypes.get(classPropertyName) == Integer.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Double.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Date.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Short.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Boolean.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Byte.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Long.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Float.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Character.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == List.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == String.class){ continue; }else if(classPropertyNamesAndTypes.get(classPropertyName) == Set.class){ //ignoreObjectNames.add(classPropertyName); //System.out.println("过滤"+classPropertyName+"----Set集合"); }else{ if(levelCount < level){ ignoreObjectNames.addAll(getIgnoreObjectName(classPropertyNamesAndTypes.get(classPropertyName) ,level-levelCount)); }else{ ignoreObjectNames.add(classPropertyName); //System.out.println("过滤"+classPropertyName+"----"+classPropertyNamesAndTypes.get(classPropertyName)+"对象"); } } } } return ignoreObjectNames; } /** * json-lib用，返回不需要生成json的字段（忽略Object和Set） * @param detachedObject 传入需要转换json的对象 * @return */ public List<String> getIgnoreObjectName(Object detachedObject){ List<String> ignoreObjectNames = new ArrayList<String>(); if(detachedObject!=null){ List<String> classPropertyNames = this.getClassPropertyName(detachedObject); for(String classPropertyName : classPropertyNames){ Object detachedObjectPropertyValue = this.getter(detachedObject, classPropertyName); if(detachedObjectPropertyValue!=null){ if(detachedObjectPropertyValue instanceof Object){ if(detachedObjectPropertyValue instanceof Integer){ continue; }else if(detachedObjectPropertyValue instanceof String){ continue; }else if(detachedObjectPropertyValue instanceof Double){ continue; }else if(detachedObjectPropertyValue instanceof Date){ continue; }else if(detachedObjectPropertyValue instanceof Short){ continue; }else if(detachedObjectPropertyValue instanceof Boolean){ continue; }else if(detachedObjectPropertyValue instanceof Byte){ continue; }else if(detachedObjectPropertyValue instanceof Long){ continue; }else if(detachedObjectPropertyValue instanceof Float){ continue; }else if(detachedObjectPropertyValue instanceof Character){ continue; }else if(detachedObjectPropertyValue instanceof List){ continue; }else{ ignoreObjectNames.add(classPropertyName); } } } } } return ignoreObjectNames; } /** * 返回 * @param detachedObject * @return */ public Object getAddObject(Object detachedObject){ List<String> classPropertyNames = this.getClassPropertyName(detachedObject); for(String classPropertyName : classPropertyNames){ Object detachedObjectPropertyValue = this.getter(detachedObject, classPropertyName); if (detachedObjectPropertyValue == null || detachedObjectPropertyValue.equals("-1") || detachedObjectPropertyValue.toString().equals("-1")) { continue; } if(detachedObjectPropertyValue instanceof List){ continue; }else if(detachedObjectPropertyValue instanceof Set){ continue; }else{ if(detachedObjectPropertyValue!=null){ if(detachedObjectPropertyValue instanceof Object){ if(detachedObjectPropertyValue instanceof Integer){ continue; }else if(detachedObjectPropertyValue instanceof String){ continue; }else if(detachedObjectPropertyValue instanceof Double){ continue; }else if(detachedObjectPropertyValue instanceof Date){ continue; }else if(detachedObjectPropertyValue instanceof Short){ continue; }else if(detachedObjectPropertyValue instanceof Boolean){ continue; }else if(detachedObjectPropertyValue instanceof Byte){ continue; }else if(detachedObjectPropertyValue instanceof Long){ continue; }else if(detachedObjectPropertyValue instanceof Float){ continue; }else if(detachedObjectPropertyValue instanceof Character){ continue; }else{ try { if(this.getter(detachedObjectPropertyValue, "uuid")!=null){ continue; } } catch (Exception e) { continue; } } } System.out.println(classPropertyName+"&&"+detachedObjectPropertyValue.toString().trim()+"&&"+detachedObjectPropertyValue.getClass()); this.setter(detachedObject, classPropertyName, null, detachedObjectPropertyValue.getClass()); } } } return detachedObject; } /*public static void main(String[] args) { House house = new House(); house.setId(2); house.setStreet_id(3); SQLUtil sql = new SQLUtil(); System.out.println(sql.getSQL(house)); }*/ /** * 返回查询记录数的HQL * @param obj 需要查询的表的实体 * @param sql ： from....where....... * @return */ public String getRowCountSQL(Object obj , String sql) { StringBuffer sb = new StringBuffer(); List<String> classPropertyName = this.getClassPropertyName(obj); sb.append(" select Count("); sb.append(classPropertyName.get(0)); sb.append(") "); sb.append(sql); System.out.println(sb.toString()); return sb.toString(); } }