Jackson在OracleResultSet的数值周围加引号

我使用Jackson JSON API在Java中创建JSON对象,然后打印。

我的代码类似于:

OracleResultSet rs = getMyResultSet();
OracleResultSetMetaData rsmd = (OracleResultSetMetaData)rs.getMetaData();

int columnCount = rsmd.getColumnCount();
String[] columnNames = new String[columnCount];
int[] columntypes = new int[columnCount];

for(int i = 1; i < columnCount; ++i) {
    columnNames[i] = rsmd.getColumnName(i);
    columnTypes[i] = rsmd.getColumnTypes(i);
}

ObjectMapper mapper = new ObjectMapper();
ObjectNode node;

String columnName;

while(rs.next()) {
    node = mapper.createObjectNode();

    for(int i = 1; i < columnCount; ++i) {
        columnName = columnNames[i];

        //I have a case defined for every OracleTypes.XXXX, but for brevity I'm only putting the one I'm having issues with here
        switch (columnTypes[i]) {
            case: OracleTypes.NUMBER:
                node.put(columnName, rs.getBigDecimal(i)); //BigDecimal chosen based on: http://docs.oracle.com/cd/B19306_01/java.102/b14188/datamap.htm
                break;
            default:
                node.put(columnName, rs.getString(i));
        }

        //UPDATE: the next line is the logic error that I had that was casuing the trouble
        node.put(columnName, rs.getString(i));
    }

    System.out.println(mapper.writeValueAsString(node));
}

这一切都很好。问题是我去打印它的时候。

从 OracleTypes.NUMBER case正在获取引号,即使它们不应该。我正在获取的示例字符串:

{"month":"1","year":"2013","modified":"2013-02-05 13:41:48.0","net":"294.68"}

我想要的:

{"month":"1","year":"2013","modified":"2013-02-05 13:41:48.0","net":294.68}

为什么BigDecimal(或我测试中的任何非int)被打印成引号?我的理解是,JSON中的所有实际数值都应该不加引号地打印。我认为这可能是一个基元/对象问题,并尝试从BigDecimal中获取双倍值,但这没有帮助。

我已经使用调试器测试了程序,它确实正确使用了switch-case语句,所以这不是问题所在。