java将对象转map,map转对象工具类

  /**
      * 将map转换为一个对象
      *
      * @param map
      * @param beanClass
      * @return
      * @throws Exception
      */
     public static Object mapToObject(Map<String, String> map, Class<?> beanClass) throws Exception {
         if (map == null)
             return null;

         Object obj = beanClass.newInstance();

         BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
         PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
         for (PropertyDescriptor property : propertyDescriptors) {
             Method setter = property.getWriteMethod();
             if (setter != null) {
                 setter.invoke(obj, map.get(property.getName()));
             }
         }

         return obj;
     }

     /**
      * 将对象转换为map
      *
      * @param obj
      * @return
      * @throws Exception
      */
     public static Map<String, String> obj2Map(Object obj) {

         Map<String, String> map = new HashMap<String, String>();
         // System.out.println(obj.getClass());
         // 获取f对象对应类中的所有属性域
         Field[] fields = obj.getClass().getDeclaredFields();
         for (int i = 0, len = fields.length; i < len; i++) {
             String varName = fields[i].getName();
             varName = varName.toLowerCase();//将key置为小写，默认为对象的属性
             try {
                 // 获取原来的访问控制权限
                 boolean accessFlag = fields[i].isAccessible();
                 // 修改访问控制权限
                 fields[i].setAccessible(true);
                 // 获取在对象f中属性fields[i]对应的对象中的变量
                 Object o = fields[i].get(obj);
                 if (o != null)
                     map.put(varName, o.toString());
                 // System.out.println("传入的对象中包含一个如下的变量：" + varName + " = " + o);
                 // 恢复访问控制权限
                 fields[i].setAccessible(accessFlag);
             } catch (IllegalArgumentException ex) {
                 ex.printStackTrace();
             } catch (IllegalAccessException ex) {
                 ex.printStackTrace();
             }
         }
         return map;
     }