oracle编码的问题（在线等待）

我的oracel的编码的信息如下：NLS_LANGUAGE                                                                                                                     SIMPLIFIED CHINESE
NLS_TERRITORY                                                                                                                    CHINA
NLS_CURRENCY                                                                                                                     RMB
NLS_ISO_CURRENCY                                                                                                                 CHINA
NLS_NUMERIC_CHARACTERS                                                                                                           .,
NLS_CALENDAR                                                                                                                     GREGORIAN
NLS_DATE_FORMAT                                                                                                                  DD-MON-RR
NLS_DATE_LANGUAGE                                                                                                                SIMPLIFIED CHINESE
NLS_CHARACTERSET                                                                                                                 WE8ISO8859P1
NLS_SORT                                                                                                                         BINARY
NLS_TIME_FORMAT                                                                                                                  HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT                                                                                                             DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT                                                                                                               HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT                                                                                                          DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY                                                                                                                RMB
NLS_NCHAR_CHARACTERSET                                                                                                           AL16UTF16
NLS_COMP                                                                                                                         BINARY
NLS_LENGTH_SEMANTICS                                                                                                             BYTE
NLS_NCHAR_CONV_EXCP                                                                                                              FALSE
我用Java往数据库里插入中文数据或者读出中文数据都是乱码，用PL/SQL往数据库里插入中文数据时，也是乱码，因为客户那里的Oracle的编码就是这样的，我又不能改Oracle的编码，我现在怎样处理才能使Java程序没有乱码，PL/Sql也没有乱码？望高手指点？