如何在JSON响应的2个对象之间添加换行符？还有如何从json文件中删除[]方括号？ [关闭]

Question

关闭。这个问题需要details or clarity。它当前不接受答案。

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关闭上个月。

我也尝试使用line.separator和\ n。但是它不起作用。这是我的代码：

        ResultSetMetaData rsmd = rs.getMetaData();
        JSONArray json = new JSONArray();
        while (rs.next()) {
            int numColumns = rsmd.getColumnCount();
            JSONObject obj = new JSONObject();
            for (int i = 1; i <= numColumns; i++) {
                String column_name = rsmd.getColumnName(i);
                obj.put(column_name, rs.getObject(column_name));
            }

            json.put(obj);
        }
        PrintWriter file = new PrintWriter("JFile.json");
            file.println(json);
            file.close();

    } catch (SQLException | FileNotFoundException e) {
        e.printStackTrace();
    }

编辑1这是使用JSONObject更新的代码，还在对象中添加了indentfactor显示com.fasterxml.jackson.core.io.JsonEOFException：意外的输入结束：预期的对象关闭标记：

ResultSetMetaData rsmd = rs.getMetaData();
        JSONObject obj = new JSONObject();
        while (rs.next()) {
            int numColumns = rsmd.getColumnCount();
            for (int i = 1; i <= numColumns; i++) {
                String column_name = rsmd.getColumnName(i);
                obj.put(column_name, rs.getObject(column_name));
            }
        }
        PrintWriter file = new PrintWriter("downloads/JSONFile.json");
        file.println(obj.toString());
        file.close();
    } catch (SQLException | FileNotFoundException e) {
        e.printStackTrace();
    }

Answer 1

ResultSetMetaData rsmd = rs.getMetaData();
JSONArray jsonArr = new JSONArray();
while (rs.next()) {
    int numColumns = rsmd.getColumnCount();
    JSONObject obj = new JSONObject();
    for (int i = 1; i <= numColumns; i++) {
           String column_name = rsmd.getColumnName(i);
           obj.put(column_name, rs.getObject(column_name));
        }
        jsonArr.put(obj);
   }        
//add this JSONArray to another JSONObject 
JSONObject rootJSONObject = new JSONObject();
rootJSONObject.put("data",jsonArr);

PrintWriter printWriter = new PrintWriter("sample.json");
printWriter.write(rootJSONObject.toString(4).replace("{", "\n{\n").replace("}", "\n}\n"));
printWriter.close();