transfer between javabean and map，transferjavabean

transfer between javabean and map，transferjavabean

1. java bean 轉化成 map

import java.beans.BeanInfo;import java.beans.Introspector;import java.beans.PropertyDescriptor;import java.lang.reflect.Method;import java.util.HashMap;import java.util.Map;public class BeanToMap {    public static Map<String, Object> transBean2Map(Object obj) {                    if(obj == null){              return null;          }                  Map<String, Object> map = new HashMap<String, Object>();          try {              BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());              PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();              for (PropertyDescriptor property : propertyDescriptors) {                  String key = property.getName();                    // 過濾class屬性                  if (!key.equals("class")) {                      // 得到property對應的getter方法                      Method getter = property.getReadMethod();                      Object value = getter.invoke(obj);                        map.put(key, value);                  }              }          } catch (Exception e) {              System.out.println("transBean2Map Error " + e);          }          return map;      }      }

 

2. map transfer javabean

  2.1 (使用工具類BeanUtils)

import org.apache.commons.beanutils.BeanUtilspublic static void transMap2Bean(Object obj, Map map){        if(obj==null || map==null){            return ;        }        try {            BeanUtils.populate(obj, map);        } catch (IllegalAccessException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (InvocationTargetException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }

  2.2 利用java內省

public static void transMap2Bean(Map<String, Object> map, Object obj) {                    try {              BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());              PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();                for (PropertyDescriptor property : propertyDescriptors) {                  String key = property.getName();                    if (map.containsKey(key)) {                      Object value = map.get(key);                      // 得到property對應的setter方法                      Method setter = property.getWriteMethod();                      setter.invoke(obj, value);                  }                }            } catch (Exception e) {              System.out.println("transMap2Bean Error " + e);          }            return;        }