我指的是link,但我的方法略有修改。

这是我的代码:

 public JSONArray generateJSON(ResultSet rs) {

        JSONArray respJSON = new JSONArray();

        try {
            java.sql.ResultSetMetaData rsmd = rs.getMetaData();
            int numColumns = rsmd.getColumnCount();
            while (rs.next()) {
                JSONObject obj = new JSONObject();
                for (int i = 1; i < numColumns + 1; i++) {

                    String columnName = rsmd.getColumnName(i);
                    if (rsmd.getColumnType(i) == java.sql.Types.ARRAY) {
                        obj.put(columnName, rs.getArray(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.BIGINT) {
                        obj.put(columnName, rs.getInt(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.BOOLEAN) {
                        obj.put(columnName, rs.getBoolean(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.BLOB) {
                        obj.put(columnName, rs.getBlob(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.DOUBLE) {
                        obj.put(columnName, rs.getDouble(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.FLOAT) {
                        obj.put(columnName, rs.getFloat(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.INTEGER) {
                        obj.put(columnName, rs.getInt(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.NVARCHAR) {
                        obj.put(columnName, rs.getNString(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.VARCHAR) {
                        obj.put(columnName, rs.getString(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.TINYINT) {
                        obj.put(columnName, rs.getInt(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.SMALLINT) {
                        obj.put(columnName, rs.getInt(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.DATE) {
                        obj.put(columnName, rs.getDate(i));
                    } else if (rsmd.getColumnType(i) == java.sql.Types.TIMESTAMP) {
                        obj.put(columnName, rs.getTimestamp(i));
                    } else {
                        obj.put(columnName, rs.getObject(i));
                    }

                }
                respJSON.put(obj);
                //respJSON.add(obj);

            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        respJSON.toString();

        return respJSON;

        System.out.print(respJSON.toString());
    }


我的问题是我无法打印json字符串以在控制台中查看它...

我已经尝试过respJSON.toString();它似乎不起作用..

请你帮助我好吗 ? ...

谢谢

最佳答案

您的程序无法到达print语句,因为在此之前有return语句。如果您曾经使用过NetbeansEclipse之类的IDE,那将给您明确的警告。

10-06 07:13