SimpleFeature要应用之前需要先设置schema（字段定义）SimpleFeatureType，然后用定义好的字段SimpleFeatureType对象作为参数
        构建SimpleFeature然后对字段赋值
        
          //设置scheme
        SimpleFeatureTypeBuilder b = new SimpleFeatureTypeBuilder();
        b.setName("poiTable");
        b.setCRS(DefaultGeographicCRS.WGS84);
        b.add("name", String.class);
        b.add("location", Point.class);

        SimpleFeatureType typeScheme = b.buildFeatureType();
             
               SimpleFeatureBuilder featureBuilder  = new SimpleFeatureBuilder( typeScheme );

        //存储数据
        Point point = geometryFactory.createPoint(new Coordinate(116.39622 ,40.027074));
        featureBuilder.set("location", point);
        featureBuilder.set("name", "五台山");

        //生成对象
        SimpleFeature simpleFeature = featureBuilder.buildFeature("010101");

        //对象使用
        Point point1 = (Point)simpleFeature.getAttribute("location");