//model的配置方式
alipaytradepagepaymodel model = new alipaytradepagepaymodel();
model.setouttradeno("商户自己定义的不重复订单号");
... //字符串拼接的配置
alipaytradepagepayrequest alipayrequest = new alipaytradepagepayrequest();
alipayrequest.setbizcontent("{"
"\\"out_trade_no\\":\\"商户自己定义的不重复订单号\\","
... "}");
