有这么一段字符,
我想把%2F变回/,%2B变回+,原先被处理过的BOjQCYIplt3etCnlcAPZibV61kOGAPWmHplaAYP%2Fd9MgaryLG8LOOP7yqMuHRccHoxa1VDAwVbgE%0D%0A7jDSu1HsaXy5mOPSdWoSQM%2BcpOuUVZhw7b1%2BUNIsKt7%2B0vc89Dl%2BPqcNu5hNPUYJXV3NLzL8MxUb%0D%0AiAnkiPRmmopaJQJtCwxeTqX1t%2BvZK9kh%2FtaL54md%0D%0A