import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
public class BeanToMapUtils {
public static <T> T toBean(Class<T> clazz, Map<String, Object> map) {
T obj = null;
try {
BeanInfo beanInfo = Introspector.getBeanInfo(clazz);
obj = clazz.newInstance(); // 創建 JavaBean 對象
// 得到反射類中的所有的方法
Method[] methods = clazz.getMethods();
for (Map.Entry<String, Object> entry : map.entrySet()) {
for (Method m : methods) {
// 把從結果集中得到列名前面加上"set",並把第一位設置爲大寫,加上後面的,成爲一個set的名稱,
// 然後用反射得到的方法名與之比較,相同的話則激活此方法
if (m.getName().equals("set"+ entry.getKey())) {
// 激活得到方法,並設置值
m.invoke(obj, entry.getValue());
}
}
}
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IntrospectionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return (T) obj;
}
/**
* 將一個 JavaBean 對象轉化爲一個 Map
* @param bean 要轉化的JavaBean 對象
* @return 轉化出來的 Map 對象
* @throws IntrospectionException 如果分析類屬性失敗
* @throws IllegalAccessException 如果實例化 JavaBean 失敗
* @throws InvocationTargetException 如果調用屬性的 setter 方法失敗
*/
@SuppressWarnings("rawtypes")
public static Map toMap(Object bean) {
Class<? extends Object> clazz = bean.getClass();
Map<Object, Object> returnMap = new HashMap<Object, Object>();
BeanInfo beanInfo = null;
try {
beanInfo = Introspector.getBeanInfo(clazz);
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (int i = 0; i < propertyDescriptors.length; i++) {
PropertyDescriptor descriptor = propertyDescriptors[i];
String propertyName = descriptor.getName();
if (!propertyName.equals("class")) {
Method readMethod = descriptor.getReadMethod();
Object result = null;
result = readMethod.invoke(bean, new Object[0]);
if (null != propertyName) {
propertyName = propertyName.toString();
}
if (null != result) {
result = result.toString();
}
returnMap.put(propertyName, result);
}
}
} catch (IntrospectionException e) {
System.out.println("分析類屬性失敗");
} catch (IllegalAccessException e) {
System.out.println("實例化 JavaBean 失敗");
} catch (IllegalArgumentException e) {
System.out.println("映射錯誤");
} catch (InvocationTargetException e) {
System.out.println("調用屬性的 setter 方法失敗");
}
return returnMap;
}
}