map方法集合

1. 移除map中的value空值
2. Bean转Map
3. Map转Bean

    /**
     * 1.移除map中的value空值
     * @param map
     * @return
     */
    public static void removeNullValue(Map map){
        Set set = map.keySet();
        for (Iterator iterator = set.iterator(); iterator.hasNext();) {
            Object obj = (Object) iterator.next();
            Object value =(Object)map.get(obj);
            remove(value, iterator);
        }
    }

    private static void remove(Object obj,Iterator iterator){
        if(obj instanceof String){
            String str = (String)obj;
            if(isEmpty(str)){  //过滤掉为null和""的值 主函数输出结果map：{1=AA, 5=CC, 8=  }
//            if("".equals(str.trim())){  //过滤掉为null、""和" "的值 主函数输出结果map：{2=BB, 1=AA}
                iterator.remove();
            }

        }else if(obj instanceof Collection){
            Collection col = (Collection)obj;
            if(col==null||col.isEmpty()){
                iterator.remove();
            }

        }else if(obj instanceof Map){
            Map temp = (Map)obj;
            if(temp==null||temp.isEmpty()){
                iterator.remove();
            }

        }else if(obj instanceof Object[]){
            Object[] array =(Object[])obj;
            if(array==null||array.length<=0){
                iterator.remove();
            }
        }else{
            if(obj==null){
                iterator.remove();
            }
        }
    }

    public static boolean isEmpty(Object obj){
        return obj == null || obj.toString().length() == 0;
    }
		/**
         * 2.Bean转Map
         */
        public static <T> Map<String, Object> beanToMap(T bean) {
            Map<String, Object> map = new HashMap<>();
            if (bean != null) {
                BeanMap beanMap = BeanMap.create(bean);
                for (Object key : beanMap.keySet()) {
                    map.put(key+"", beanMap.get(key));
                }
            }
            return map;
        }

        /**
         * 3.Map转Bean
         */
        public static <T> T mapToBean(Map<String, Object> map,Class<T> clazz) throws Exception {
            T bean = clazz.newInstance();
            BeanMap beanMap = BeanMap.create(bean);  //net.sf.cglib.beans.BeanMap
            beanMap.putAll(map);
            return bean;
        }