以下哪一个方法可以解决post请求时传递的中文参数乱码问题（）
Aeq.setCharacterEncoding(“utf-8”);
Bnew String( req.getParameter(key).getBytes() , “utf-8” );
Cesp.setContentType(“text/html;charset=utf-8”);
Desp.getOutputStream()
Aeq.setCharacterEncoding(“utf-8”);
Bnew String( req.getParameter(key).getBytes() , “utf-8” );
Cesp.setContentType(“text/html;charset=utf-8”);
Desp.getOutputStream()