1.hibernate中首先进行初始化，将对应的表名和类名以键值对的方式存放到map中
private Map<String, String> mappings;//全局变量
/**
* 根据数据库表名获取实体类
*/
public void initMappings() {
if (mappings == null) {
mappings = new HashMap<String, String>();
SessionFactory factory = this.getSessionFactory();
Map metaMap = factory.getAllClassMetadata();
for (String key : (Set<String>) metaMap.keySet()) {
AbstractEntityPersister classMetadata = (AbstractEntityPersister) metaMap.get(key);
String tableName = classMetadata.getTableName().toLowerCase();
int index = tableName.indexOf(".");
if (index >= 0) {
tableName = tableName.substring(index + 1);
}
String className = classMetadata.getEntityMetamodel().getName();
mappings.put(tableName, className);
}
}
}
2.调用方法，传入表名得到对应的实体类名
public String getEntityNameByTableName(String tableName) {
initMappings();
return mappings.get(tableName);
}
3.根据实体类名创建实体类
/**
*listobj:要赋的属性值集合，顺序要和实体类属性顺序一致
*/
public Object getByReflect(String tableName, List listobj)throws Exception {
Class<?> model = Class.forName(tableName);
Object object = new Object();
if (model != null) {
Field[] field = model.getDeclaredFields();
String[] modelName = new String[field.length];
String[] modelType = new String[field.length];
object = model.newInstance();
Method m = null;
for (int i = 1; i <field.length ; i++) {
String name = field[i].getName();
Object value = null;
name = name.substring(0, 1).toUpperCase() + name.substring(1);
String type = field[i].getGenericType().toString();
if (type.equals("class java.lang.String")) {
m = model.getDeclaredMethod("set" + name, String.class);
if(listobj.get(i - 1) instanceof Double){
Double d=(Double) listobj.get(i-1);
value=String.valueOf(d);
}else{
value =(String)listobj.get(i - 1);
}
}
if (type.equals("class java.lang.Integer")) {
m = model.getDeclaredMethod("set" + name, Integer.class);
Double d = (Double) listobj.get(i - 1);
value = Integer.valueOf(d.intValue());
}
if (type.equals("class java.lang.Short")) {
m = model.getDeclaredMethod("set" + name, Short.class);
value = (Short) listobj.get(i - 1);
}
if (type.equals("class java.lang.Float")) {
m = model.getDeclaredMethod("set" + name, Float.class);
value = (Float) listobj.get(i - 1);
}
if (type.equals("class java.lang.Double")) {
m = model.getDeclaredMethod("set" + name, Double.class);
value = (Double) listobj.get(i - 1);
}
if (type.equals("class java.lang.Boolean")) {
m = model.getDeclaredMethod("set" + name, Boolean.class);
value = (Boolean) listobj.get(i - 1);
}
if (m != null) {
m.invoke(object, value);
}
}
}
return object;
}