Gson与Json jar 使用的一些区别

public class GsonUtil {

public static JsonArray forJsonUtil(ResultSet rs) {
    JsonArray jsonArray = new JsonArray();
    try {
        ResultSetMetaData md = rs.getMetaData();
        int num = md.getColumnCount();
        JsonObject jsonObject = new JsonObject();
        while (rs.next()) {
            for (int i = 1; i <= num; i++) {
                Object o = rs.getObject(i);
                if (o instanceof Date) {
                    jsonObject.addProperty(md.getColumnName(i),
                            DateUtil.formatDate((Date) o, "yyyy-MM-dd"));
                } else if (o instanceof Integer) {
                    jsonObject.addProperty(md.getColumnName(i),
                            (Integer) rs.getObject(i));
                } else if (o instanceof Double) {
                    jsonObject.addProperty(md.getColumnName(i),
                            (Double) rs.getObject(i));
                } else {
                    jsonObject.addProperty(md.getColumnName(i),
                            (String) rs.getObject(i));
                }
            }
            jsonArray.add(jsonObject);
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return jsonArray;
}





public static JSONObject forJsonObjectUtil(ResultSet rs) {

    JSONObject jsonObject = new JSONObject();
    try {
        ResultSetMetaData md = rs.getMetaData();
        int num = md.getColumnCount();
        while (rs.next()) {
            for (int i = 1; i <= num; i++) {
                Object o = rs.getObject(i);
                if (o instanceof Date) {
                    jsonObject.put(md.getColumnName(i),
                            DateUtil.formatDate((Date) o, "yyyy-MM-dd"));
                } else {
                    jsonObject.put(md.getColumnName(i), rs.getObject(i));
                }
            }
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return jsonObject;
}

二者主要的区别在
Gson与JSON在使用ResultSetMetaData时的区别在于Gson需要指明栏位的类型,不然存在转换异常的问题

• 而JSON可以指定類型也可以不指定類型.