Spring JdbcTemplate 查询结果 实体生成工具
import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import java.lang.reflect.Field;import java.util.*;/** * Created by 黄永光 * User: Administrator * Date: 2011-8-11 * Time: 10:30:15 * <p/> * 将实体工具类，Spring查询对象封装实体工具. */public class EntityTool { static Log LOGGER = LogFactory.getLog(EntityTool.class); /** * 将map转成实体，map中的key必须与实体中的属性名相同才可以转换成功 * * @param entityMap 实体map，属性键值对，其中key为实体的属性名，value为属性的值 * @param entityType 实体类 * @param <T> * @return */ public static <T> T converToEntity(Map<String, Object> entityMap, Class<T> entityType) { T result = null; try { result = entityType.newInstance(); Map<String, Field> fieldsMap = getFieldMap(entityType); Field field = null; for (Map.Entry<String, Object> entry : entityMap.entrySet()) { field = fieldsMap.get(entry.getKey().toLowerCase()); if (field == null) { LOGGER.error("键值" + entry.getKey().toLowerCase() + "在" + entityType.getName() + "中找不到对应的属性！"); throw new Exception(); } field.setAccessible(true); Object value = entry.getValue(); if (value == null) { continue; } if (isBasicType(field.getType())) { // System.out.println(field.getName()+"="+value); System.out.println(field.getType()); if (field.getType().equals(boolean.class) || field.getType().equals(Boolean.class)) { if (value.equals(new Boolean(true) || value.equals(true)) || value.equals(new Boolean(true) || value.equals(true))) { field.set(result, value); } else { if (value.toString().equals("1")) { field.set(result, true); } else { field.set(result, false); } } } else { field.set(result, value); } } else { /* 设置复合类型属性，只设id如果存在 */ Class fildType = field.getType(); Field idField = null; try { idField = getDeclaredField("id", fildType, true); } catch (NoSuchFieldException e) { continue; } if (idField != null) { idField.setAccessible(true); Object compositeFieldValue = fildType.newInstance(); idField.set(compositeFieldValue, value); field.set(result, compositeFieldValue); } else { LOGGER.warn("复合属性" + entry.getKey().toLowerCase() + "没有id属性，没有赋值！"); } } } } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } return result; } /** * 得到某类的属性 * @param fieldName 属性名 * @param clazz 类 * @param withSuperClass 是否从父类中取属性 * @return */ private static Field getDeclaredField(String fieldName, Class clazz, boolean withSuperClass) throws NoSuchFieldException { Field field = null; try { field = clazz.getDeclaredField(fieldName); } catch (NoSuchFieldException e) { if (field == null && withSuperClass) { Class superClazz = clazz.getSuperclass(); if (superClazz != null) { field = getDeclaredField(fieldName, superClazz, withSuperClass); } } else { throw e; } } return field; } /** * 将多个map转换成实体集合 * * @param datas * @param entityType * @param <E> * @return */ public static <E> List<E> convertToEntities(List<Map<String, Object>> datas, Class<E> entityType) { List<E> result = new ArrayList<E>(); E data = null; for (Map<String, Object> map : datas) { data = converToEntity(map, entityType); result.add(data); data = null; } return result; } /** * 判断是不是基本类型 * * @param type * @return */ public static boolean isBasicType(Class type) { if (type.isPrimitive()) { return true; } if (type.getPackage().getName().equals("java.lang") || type.getPackage().getName().equals(("java.util"))) { return true; } else if (type.equals(java.sql.Date.class)) { return true; } else { return false; } } /** * 得到某个类的属性map key为属性名，value为属性 * * @param entityClass * @return */ public static Map<String, Field> getFieldMap(Class entityClass) { Field[] fields = entityClass.getDeclaredFields(); Map<String, Field> fieldsMap = new HashMap<String, Field>(); for (Field field : fields) { fieldsMap.put(field.getName().toLowerCase(), field); } Class superclass = entityClass.getSuperclass(); if (superclass != null) { fieldsMap.putAll(getFieldMap(superclass)); } return fieldsMap; } public static void main(String[] args) { /*Map<String,Field> fields= getFieldMap(User.class); for(Map.Entry<String,Field> entry:fields.entrySet()){ System.out.println(entry.getKey()+":"+entry.getValue()); }*/ Map<String, Object> map = new HashMap<String, Object>(); map.put("id", null); map.put("userId", null); map.put("employee", null); map.put("password", null); map.put("userStatus", null); map.put("historyPwdList", null); map.put("statusChangeTime", null); map.put("updateTimeStamp", null); map.put("passwordUpdateTime", null); map.put("createTimeStamp", null); map.put("removed", null); User user = converToEntity(map, User.class); System.out.println(user.getId()); }}?
1 楼 osacar 2011-10-03 写得不错啊。